Disclosed in the present application are a data synchronization method and system for a redundant device, and a storage medium and an electronic device. The data synchronization method comprises: a target device sending a data synchronization request to a data source device; according to first operation data from the data source device, starting the target device; and according to second operation data from the data source device, controlling the target device and the data source device to synchronously operate, wherein the first operation data is generated by the data source device according to the data synchronization request, and the second operation data is obtained by means of the data source device periodically updating the first operation data. In the present application, the target device and the data source device can synchronously operate by means of the first operation data and periodically updated second operation data of the data source device, and an out-of-step device can be re-synchronized in a timely manner by means of the periodically updated second operation data of the data source device.
Disclosed in the present application are a remote protection information transmission system and method based on a transparent transmission link. The system comprises a main station and a transformer substation, wherein the transformer substation comprises a transparent proxy module and a plurality of protection apparatuses, the main station is connected to the transparent proxy module, and the transparent proxy module is connected to the plurality of protection apparatuses; and the transparent proxy module is configured to send first specification data to a corresponding protection apparatus according to a forwarding command for the first specification data that is sent by the main station, and send a forwarding command for second specification data to the main station after receiving the second specification data sent by the protection apparatus and a communication connection number thereof.
dtmaxdtmindtmaxdtmindtsetampampampsetampsetIampIampsetp1p2p3pNmaxminmin among the sequence subset; when (I) is satisfied, determining that a third discrimination condition is satisfied; on the basis of a differential motion equation, determining that the differential ratio characteristic is satisfied; and when the first discrimination condition or the second discrimination condition or the third discrimination condition is satisfied, and the differential ratio characteristic is satisfied, starting a differential protection action of a transformer. According to the method, the differential protection action of the transformer can be timely started, so that the transformer is protected.
Provided in the present application are a grid-forming control method for a wind power converter, and a wind power converter system. The wind power converter comprises a generator-side converter and a grid-side converter, which are connected in parallel on a direct-current side, wherein the grid-side converter includes an alternating-current filter. The generator-side converter keeps a conventional alternating-current control strategy unchanged, and the grid-side converter controls both a direct-current voltage and an alternating-current voltage thereof. The grid-side converter takes an output of a direct-current voltage control loop as a target value of a d-axis positive-sequence component of a grid-side current, and performs closed-loop control on each of positive-sequence and negative-sequence components of a capacitor branch voltage and current of the alternating-current filter and each of positive-sequence and negative-sequence components of the grid-side current by using a method for performing directional vector control on each of positive-sequence and negative-sequence voltages. An instruction value of a generator-side current is corrected by using amplitude control loops for the capacitor branch voltage of the alternating-current filter and the direct-current voltage, so as to balance power transmission between a generator side and a grid side. In the present application, a generator-side control strategy is kept unchanged, and grid-forming of a wind turbine generator is implemented only by means of modifying a grid-side control algorithm, such that continuous operation can be achieved under grid-side imbalance, thereby improving the power grid supporting capacity of the wind turbine generator.
H02J 3/40 - Synchronisation d'un générateur pour sa connexion à un réseau ou à un autre générateur
H02J 3/26 - Dispositions pour l'élimination ou la réduction des asymétries dans les réseaux polyphasés
H02J 3/48 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs contrôlant la répartition de puissance entre les générateurs, convertisseurs ou transformateurs contrôlant la répartition de la composante en phase
5.
CONTROL METHOD AND APPARATUS FOR BIPOLAR FLEXIBLE DIRECT-CURRENT POWER TRANSMISSION SYSTEM
Provided in the present application are a control method and apparatus for a bipolar flexible direct-current power transmission system. A bipolar flexible direct-current power transmission system comprises an energy consumption device, and a new energy unit, a bipolar flexible direct-current unit and an alternating-current power grid which are sequentially connected, wherein the energy consumption device is connected to the bipolar flexible direct-current unit. The control method comprises: determining whether a bipolar flexible direct-current power transmission system has a fault; when the bipolar flexible direct-current power transmission system has a fault, determining whether a bipolar flexible direct-current unit is single-pole blocked or whether an alternating-current power grid has a fault; when the bipolar flexible direct-current unit is single-pole blocked or the alternating-current power grid has a fault, determining whether the bipolar flexible direct-current unit has surplus power; and when the bipolar flexible direct-current unit has surplus power, according to the relationship between the surplus power and the maximum available power for energy consumption, confirming whether to execute energy consumption control or execute sending-end active alternating-current voltage control.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
6.
GRID-FORMING VOLTAGE SOURCE CONVERTER SYSTEM AND MULTI-OBJECTIVE CONTROL METHOD
Provided in the present application are a grid-forming voltage source converter system and a multi-objective control method. The grid-forming voltage source converter system comprises a power generation unit, a load unit, a grid-forming converter and a control device, wherein the power generation unit, the load unit, and an alternating-current side of the grid-forming converter are connected in parallel at a common connection point; the grid-forming converter controls the direct-current voltage of the grid-forming converter while establishing the voltage of the common connection point; when the voltage amplitude of the common connection point changes, the active power of the power generation unit generates an active increment on the basis of an operating point, or the active power of the load unit generates an active increment on the basis of the operating point; and the grid-forming converter generates, according to a change in the direct-current voltage, an instruction value of an active power flowing into the grid-forming converter, and by means of adjusting the voltage of the common connection point, the instruction value of the active power flowing into the grid-forming converter is equal to an actual value and is also equal to the difference between the active power of the power generation unit and the active power of the load unit, thereby stabilizing the direct-current voltage of the grid-forming converter.
H02J 3/40 - Synchronisation d'un générateur pour sa connexion à un réseau ou à un autre générateur
H02J 3/48 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs contrôlant la répartition de puissance entre les générateurs, convertisseurs ou transformateurs contrôlant la répartition de la composante en phase
H02J 3/26 - Dispositions pour l'élimination ou la réduction des asymétries dans les réseaux polyphasés
7.
POWER CONTROL METHOD AND APPARATUS FOR FLEXIBLE DIRECT-CURRENT TRANSMISSION SYSTEM
Provided in the present application are a power control method and apparatus for a flexible direct-current transmission system. The flexible direct-current transmission system comprises an external sending-end system and a flexible direct-current electricity transmission system, the flexible direct-current electricity transmission system comprising a sending end. The power control method for a sending end comprises: when a flexible direct-current transmission system requires power regulation, controlling a sending end to enter an emergency control mode, and regulating the frequency of an output voltage of the sending end, so as to regulate active power transmission of the flexible direct-current transmission system, thereby realizing power regulation of the flexible direct-current transmission system. When a set measurement value of the external sending-end system meets a set threshold value or a set measurement value measured by the flexible direct-current electricity transmission system meets the set threshold value, or when the external sending-end system receives a communication instruction, the external sending-end system is controlled to enter a fixed-frequency operation mode.
H02J 3/00 - Circuits pour réseaux principaux ou de distribution, à courant alternatif
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
8.
DISTRIBUTED TRAVELING WAVE FAULT LOCATION METHOD AND SYSTEM, AND ELECTRONIC DEVICE AND STORAGE MEDIUM
A distributed traveling wave fault location method and system, and an electronic device and a storage medium. The method comprises: numbering traveling wave collection apparatuses, which are dispersedly installed on a line, and forming an adjacency information matrix according to installation positions of the traveling wave collection apparatuses and a line length parameter (S100); receiving a fault traveling wave current waveform of each traveling wave collection apparatus, extracting a traveling wave front moment according to the fault traveling wave current waveform, and selecting, as a reference traveling wave collection apparatus, a traveling wave collection apparatus at which a traveling wave front arrives first (S200); correcting the adjacency information matrix on the basis of traveling wave front moment data (S300); acquiring all adjacent traveling wave collection apparatuses of the reference traveling wave collection apparatus according to the corrected adjacency information matrix, and classifying the adjacent traveling wave collection apparatuses into an upstream adjacency group and a downstream adjacency group (S400); executing traveling wave location on both the upstream adjacency group and the downstream adjacency group, so as to obtain two location results (S500); and according to the location results of the upstream adjacency group and the downstream adjacency group, determining an adjacency group where a fault is located, and determining a final location result (S600).
The present application provides a high-voltage direct-mounted flexible alternating current loop closing device. The high-voltage direct-mounted flexible alternating current loop closing device comprises three phases of converter chains and three multi-winding transformers; the three phases of converter chains are connected to a first alternating current system and a second alternating current system; each phase of converter chain comprises N active sub-modules connected in series and a series reactor, and N is an integer greater than or equal to 1; each multi-winding transformer comprises a primary winding and N first secondary windings, and the N first secondary windings are connected to the N active sub-modules in one-to-one correspondence; the primary winding of each multi-winding transformer is connected to the first alternating current system or the second alternating current system.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
H02J 13/00 - Circuits pour pourvoir à l'indication à distance des conditions d'un réseau, p. ex. un enregistrement instantané des conditions d'ouverture ou de fermeture de chaque sectionneur du réseauCircuits pour pourvoir à la commande à distance des moyens de commutation dans un réseau de distribution d'énergie, p. ex. mise en ou hors circuit de consommateurs de courant par l'utilisation de signaux d'impulsion codés transmis par le réseau
10.
CURRENT BREAKING APPARATUS AND CONTROL METHOD THEREFOR, AND DIRECT-CURRENT POWER TRANSMISSION AND DISTRIBUTION SYSTEM
The present application provides a current breaking apparatus and a control method therefor, and a direct-current power transmission and distribution system. The current breaking apparatus comprises a first through-flow branch, a second through-flow branch, a first transfer branch, a second transfer branch, an energy consumption branch, a reactor and a self-excitation module, wherein the first through-flow branch comprises a first mechanical switch; the second through-flow branch comprises a second mechanical switch; the second transfer branch comprises a capacitor; the energy consumption branch comprises an energy absorption device; the reactor is provided in the first through-flow branch and/or the first transfer branch and/or the second transfer branch; the self-excitation module is provided in the first through-flow branch or the first transfer branch or the second transfer branch; when a short-circuit fault occurs in a power line, the self-excitation module outputs a pulse square-wave voltage, and excites the capacitor and the reactor to oscillate to generate an oscillation current having the same amplitude as a fault current and having a direction opposite to that of the fault current, so as to turn off the first mechanical switch and the second mechanical switch; and the energy absorption device is used for consuming energy.
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
H02H 3/087 - Circuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions électriques normales de travail avec ou sans reconnexion sensibles à une surcharge pour des systèmes à courant continu
H02J 1/00 - Circuits pour réseaux principaux ou de distribution, à courant continu
Provided in the present application are an energy supply device and a converter valve. The energy supply device comprises a damping circuit, a rectifying circuit, a voltage amplitude limiting unit, a first diode, a first capacitor, a direct current-direct current isolation unit, and a second capacitor. One end of the damping circuit is connected to a first output end of the rectifying circuit. The voltage amplitude limiting unit is connected in parallel to the rectifying circuit. The anode of the first diode is connected to the first output end of the rectifying circuit, and the cathode thereof is connected to one end of the first capacitor. The other end of the first capacitor is connected to a second output end of the rectifying circuit. The direct current-direct current isolation unit is connected in parallel to the first capacitor. The second capacitor is connected in parallel to an output end of the direct current-direct current isolation unit. Output ends of the second capacitor serve as a positive output end and a negative output end of the energy supply device, the negative output end being connected to a second input end of the rectifying circuit.
H02M 7/217 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
H02M 1/00 - Détails d'appareils pour transformation
H02J 3/38 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
12.
CURRENT OUTPUT DEVICE, AND CURRENT SIMULATION SYSTEM AND CONTROL METHOD THEREFOR
The present application provides a current output device, and a current simulation system and a control method therefor. The current output device comprises at least two current sources; the at least two current sources output at least two current amplitude weights, wherein any one of the at least two current sources comprises a direct current source and a direct current unit, the direct current source being connected to the direct current unit; the direct current unit comprises two output terminals to be used as a first output terminal and a second output terminal of the corresponding current source; the at least two current sources are connected to each other by means of respective first output terminals and are connected to each other by means of respective second output terminals to implement mutual parallel connection; the current sources outputting current amplitude weights output level currents or zero-level currents of the corresponding current amplitude weights by means of corresponding direct current units; and the current output device outputs any current by means of a parallel combination of current sources outputting different current amplitude weights.
Provided in the present application are a voltage device, a voltage simulation apparatus, and a control method. The voltage device comprises at least two voltage sources, wherein output ends of the voltage sources are sequentially connected in series; the voltage sources each comprise a direct-current voltage source and a voltage selection unit; the direct-current voltage source is connected to the voltage selection unit; the voltage selection unit comprises a first output terminal and a second output terminal, which serve as the output end of the voltage source; the at least two voltage sources each have a corresponding voltage amplitude weight; voltages outputted by the at least two voltage sources by means of the voltage selection units include level voltages or zero-level voltages corresponding to the voltage amplitude weights; and by means of a series combination of voltage sources having different voltage amplitude weights, the voltage device outputs any voltage. A voltage fitting algorithm based on approximation of voltages having different weights solves the problem of existing experimental equipment being unable to accurately output complex changing voltages, a simple topological structure and high control precision are achieved, and a microsecond-level tracking simulation can be performed on various rapidly changing complex voltage waveforms.
H03K 3/57 - Générateurs caractérisés par le type de circuit ou par les moyens utilisés pour produire des impulsions par l'utilisation d'un élément accumulant de l'énergie déchargé dans une charge par un dispositif interrupteur commandé par un signal extérieur et ne comportant pas de réaction positive le dispositif de commutation étant un dispositif à semi-conducteurs
H02M 3/145 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu sans transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande
The present invention relates to an air-cooling variable-frequency converter, comprising a box body, the interior of which is divided into a left compartment, a middle compartment and a right compartment, wherein the box body is internally provided with an auxiliary control system, which is mounted in the left compartment, a variable-frequency converter valve and a multi-winding transformer, which are mounted in the middle compartment and are distributed at the front and the rear, a station transformer, which is mounted in the right compartment, and a heat dissipation system, which is used for performing heat dissipation on the interior of the box body; and each phase of the variable-frequency converter valve comprises several cascaded module units, which are designed in a flattened manner, input sides of the cascaded module units in the same phase are connected to secondary coils in the same phase of the multi-winding transformer, and output sides thereof are sequentially connected end to end in series by means of a connection bar. The present invention uses a modular design to make the overall structure of a converter valve simpler and more compact, thereby saving on an occupied space, improving the convenience for subsequent maintenance, and improving the stability of the converter valve during operation.
Provided is a module overvoltage protection circuit, which relates to the technical field of voltage direct current transmission. The module overvoltage protection circuit comprises: a bridge structure module, the bridge structure module comprising multiple power devices and anti-parallel diodes thereof; a direct-current energy storage capacitor, the direct-current energy storage capacitor being connected in parallel with the bridge structure module; and an overvoltage protection circuit, the overvoltage protection circuit being connected between a positive electrode of the direct-current energy storage capacitor and a gate electrode of a power device, and the overvoltage protection circuit comprising multiple groups of first transient voltage suppression diodes and first isolation diodes which are connected in series. After a basis for an overvoltage determination is directly obtained from the direct-current energy storage capacitor, a short-circuit protection device is triggered to be switched on, to implement a module overvoltage protection function; this improves the problem of over-voltage protection refusal of a power device while not affecting an original working state of the circuit, and also reduces misoperation risk.
H02M 1/32 - Moyens pour protéger les convertisseurs autrement que par mise hors circuit automatique
H02H 9/04 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de tension
H02M 1/088 - Circuits spécialement adaptés à la production d'une tension de commande pour les dispositifs à semi-conducteurs incorporés dans des convertisseurs statiques pour la commande simultanée de dispositifs à semi-conducteurs connectés en série ou en parallèle
H02H 7/12 - Circuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour convertisseursCircuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour redresseurs pour convertisseurs ou redresseurs statiques
16.
FLEXIBLE ALTERNATING-CURRENT INTERCONNECTION APPARATUS AND STARTUP CONTROL METHOD
Provided in the present application are a flexible alternating-current interconnection apparatus and a startup control method. The apparatus comprises: three phases of interconnection converter chains, and an energy supply unit, each phase of interconnection converter chain comprising N power balance sub-modules, M first-type full-bridge sub-modules and a reactor, wherein each power balance sub-module comprises a second full-bridge circuit, a second direct-current capacitor and a first bridge circuit; each first-type full-bridge sub-module comprises a first direct-current capacitor and a first full-bridge circuit, and a direct-current end of the first full-bridge circuit is connected to the first direct-current capacitor in parallel; alternating-current ends of the first bridge circuits of each phase of interconnection converter chain are connected to the energy supply unit, such that the energy supply unit performs a power exchange with the power balance sub-modules of each phase of interconnection converter chain; and when M is greater than 0, alternating-current ends of the second full-bridge circuits of each phase of interconnection converter chain and alternating-current ends of the first full-bridge circuits thereof are connected to the reactor in series to form a series branch, one end of the series branch being connected to a first alternating-current power grid, and the other end of the series branch being connected to a second alternating-current power grid.
Disclosed in the present invention are a thermal expansion compensation fiber optic insulator and a method for using same. The thermal expansion compensation fiber optic insulator comprises an insulating assembly; the insulating assembly comprises a hanging flange, an expansion joint, pressing members, a fixing flange, and an insulator; one end of the expansion joint is connected to the hanging flange, and the other end of the expansion joint is connected to the fixing flange; the pressing members are mounted on the expansion joint; and the insulator matches the fixing flange. According to the device, by means of cooperation between the expansion joint and the pressing members, complete filling of a glue solution is achieved in a core body of the fiber optic insulator, thereby avoiding the problems of glue solution leakage, fiber optic pressing and the like, and improving the insulating property.
Provided in the present application are a full-compensation arc suppression system and method based on adjustable reactance. The arc suppression system comprises a first contactor, a second contactor, a third contactor, a first adjustable reactor, a second adjustable reactor, and a line selection and arc suppression apparatus. A three-phase voltage of a bus, a zero sequence voltage and a zero sequence current are inputted into an input end of the line selection and arc suppression apparatus; an output end of the line selection and arc suppression apparatus is connected to the first contactor, the second contactor and the third contactor, and is used for controlling the switching on and off of the first contactor, the second contactor and the third contactor; and the output end is connected to the first adjustable reactor and the second adjustable reactor, and is used for controlling voltage division coefficients of the first adjustable reactor and the second adjustable reactor, such that the arc suppression system outputs a designated amplitude and phase of a voltage.
H02H 9/08 - Limitation ou suppression des courants de défaut à la terre, p. ex. bobine Petersen
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
19.
IMMERSION ENERGY STORAGE BATTERY THERMAL MANAGEMENT SYSTEM AND FIRE CONTROL METHOD
Disclosed in the present invention are an immersion energy storage battery thermal management system and a fire control method. The immersion energy storage battery thermal management system comprises a battery cabinet, an immersion circulation system, and a battery management system; the battery cabinet comprises at least one battery box, and a plurality of battery cells immersed in a cooling liquid are housed in each battery box; the immersion circulation system is connected to the battery boxes, respectively; the battery management system is used for determining whether irreversible thermal runaway occurs in a battery cell, and when irreversible thermal runaway occurs in a certain battery cell, controlling the immersion circulation system to intermittently pump the cooling liquid into the battery box where the battery cell is located; within a time interval between every two times of pumping of the cooling liquid, it is ensured that the top of the battery cell in which the thermal runaway occurs is always covered by the cooling liquid. The present invention can overcome the problems and defects of high fire extinguishing costs, poor response timeliness, low reliability, and complex structures of existing energy storage battery fire protection systems.
A water cooling system leakage monitoring method, comprising: acquiring liquid level value change data, and constructing a scale function; decomposing the liquid level value change data into low-order high-frequency components and low-order low-frequency components by using a wavelet transform; reconstructing a high-order scale function by using the low-order low-frequency components; obtaining a liquid level change trend curve according to the high-order scale function, and monitoring, according to the liquid level change trend curve, whether leakage occurs. By means of a wavelet transform method, liquid level fluctuations caused by temperature can be filtered so as to obtain liquid level change trend data, so that the leakage of a valve cooling system can be effectively and accurately determined, defects of valve cooling monitoring means in the prior art can be overcome, and the stability of the valve cooling system is improved.
G01M 3/26 - Examen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation d'un fluide ou en faisant le vide par mesure du taux de perte ou de gain d'un fluide, p. ex. avec des dispositifs réagissant à la pression, avec des indicateurs de débit
G01F 23/80 - Dispositions pour le traitement des signaux
21.
BATTERY ENERGY STORAGE SYSTEM STATE-OF-CHARGE BALANCE CONTROL METHOD AND APPARATUS
Disclosed in the present application are a battery energy storage system state-of-charge balance control method and apparatus, belonging to the field of battery energy storage system state-of-charge control. The control method comprises: acquiring an SOC value of each cascade battery module of a battery energy storage system and sorting same; acquiring a direct-current side voltage of each cascade battery module of the battery energy storage system, and determining the number of carriers n of the current system; acquiring charging and discharging states of the battery energy storage system, and, according to the charging and discharging states, the number of carriers n and the sorting information of the SOC values, selecting n input battery modules; and performing carrier phase-shift modulation on the n input battery modules. The control apparatus comprises a first acquisition module, a second acquisition module, a third acquisition module and a modulation module.
The present application relates to the technical field of flexible direct-current power transmission, and discloses an adaptive suppression method and system for flexible direct-current high-frequency resonance. The method comprises: connecting notch filters and a counter into a voltage feedforward control link of a converter; measuring harmonic contents of a grid-side bus voltage of the converter in real time, setting a first preset threshold, and outputting a harmonic frequency exceeding the first preset threshold and having a highest content; outputting a second-order notch filter transfer function to the notch filters according to the harmonic frequency; setting a second preset threshold and a third preset threshold to obtain a comparison result, the counter performing counting according to the result and determining the switching on and off of the notch filters. The system comprises a harmonic detection unit, a notch parameter selection unit and a harmonic suppression unit. According to the present application, high-frequency harmonic components can be quickly suppressed, the risk of multi-point high-frequency resonance that may occur due to changes in the operation mode of an alternating-current system is effectively reduced; moreover, the present application is simple in logic, small in calculation amount, and suitable for engineering application, and can provide a guarantee for the stable operation of a flexible direct-current power transmission system under all working conditions.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
H02J 3/01 - Dispositions pour réduire les harmoniques ou les ondulations
H02J 3/00 - Circuits pour réseaux principaux ou de distribution, à courant alternatif
H02J 3/24 - Dispositions pour empêcher ou réduire les oscillations de puissance dans les réseaux
23.
DUAL-CONVERTER PARALLEL CIRCUIT AND CONTROL METHOD AND DEVICE THEREFOR, AND DIRECT CURRENT POWER TRANSMISSION SYSTEM
The present application provides a dual-converter parallel circuit and a control method and device therefor, and a direct current power transmission system. The dual-converter parallel circuit comprises a first converter, a second converter and a connecting circuit. The first converter comprises three first upper bridge arms and three first lower bridge arms, and each first upper bridge arm and each first lower bridge arm both comprise a first semi-controlled valve and a first fully-controlled valve which are connected in series. The second converter comprises three second upper bridge arms and three second lower bridge arms, and each second upper bridge arm and each second lower bridge arm both comprise a second valve. The connecting circuit comprises a third valve and a fourth valve.
H02M 7/162 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type thyratron ou thyristor exigeant des moyens d'extinction utilisant uniquement des dispositifs à semi-conducteurs dans une configuration en pont
24.
BRIDGE ARM CIRCUIT HAVING CAPACITOR-ASSISTED TURN-OFF, CONVERTER, METHOD, APPARATUS, AND SYSTEM
The present application provides a bridge arm circuit having capacitor-assisted turn-off, a converter, a method, an apparatus and a system. The bridge arm circuit having capacitor-assisted turn-off comprises a main branch and an assisted turn-off branch. The main branch comprises a first semi-controlled valve. The assisted turn-off branch is connected in parallel with the main branch, the assisted turn-off branch comprising a power electronic switch and a first capacitor, connected in series; the power electronic switch bidirectionally conducts current, is bidirectionally controllable to turn on, and unidirectionally controllable to turn off.
H02M 1/06 - Circuits spécialement adaptés pour rendre non-conducteurs les tubes à décharge ou les dispositifs à semi-conducteurs équivalents, p. ex. thyratrons, thyristors
25.
ENERGY STORAGE SYSTEM STRUCTURE FOR AC POWER GRID INTERCONNECTION AND CONTROL METHOD
The present application discloses an energy storage system structure for an AC power grid interconnection and a control method. The energy storage system structure for an AC power grid interconnection comprises: an energy storage battery unit; a first DC/AC converter device, a AC side of the first DC/AC converter device being connected to a first AC power grid, and positive and negative electrodes of a DC side of the first DC/AC converter device being respectively connected to positive and negative electrodes of the energy storage battery unit; and a second DC/AC converter device, a AC side of the second DC/AC converter device being connected to a second AC power grid, and positive and negative electrodes of a DC side of the second DC/AC converter device being respectively connected to the positive and negative electrodes of the energy storage battery unit.
The present application provides a method for determining the direction of current in a bridge arm of a modular multilevel converter, a control system, an electronic device, and a computer storage medium. The determining method comprises: determining the direction of current by using a first determining mode, wherein the first determining mode comprises taking the positive-negative property of a periodic variation of voltage of a capacitor in a bridge arm as the direction of the current, or, reversing the direction of the current according to a fixed period and taking a reversing result as the direction of the current. When the current in the bridge arm is small, the direction of the current in the bridge arm is determined according to the variation of the voltage of the sub-module capacitor in the bridge arm or reversing at the fixed period, such that the problem of bridge arm current sampling distortion caused by factors such as current sampling zero drift in the case of small current can be avoided.
The present application relates to the field of electric automation, and provides a transformer state analysis method and system, a device, and a storage medium. The transformer state analysis method comprises: acquiring known data of a transformer, and calculating according to the known data to obtain missing data (S101); mapping the known data and the missing data to a three-dimensional model to form a digital twin (S103); performing real-time data synchronization on the digital twin and the transformer by means of variable-period data updating (S105); and acquiring state data of the transformer calculated by the digital twin so as to provide a control decision prompt (S107).
G06F 30/23 - Optimisation, vérification ou simulation de l’objet conçu utilisant les méthodes des éléments finis [MEF] ou les méthodes à différences finies [MDF]
The present application provides a converter control system and method, which are used for controlling a converter to simulate a synchronous generator. The system comprises a power synchronization control unit, an alternating-current voltage reference vector calculation unit and an alternating-current voltage instruction generation unit, wherein the power synchronization control unit is used for simulating a speed regulator and a mechanical inertia link of a synchronous generator and generating a reference phase; the alternating-current voltage reference vector calculation unit collects an inner electric potential vector and an alternating-current voltage vector and generates an alternating-current voltage reference vector; and the alternating-current voltage instruction generation unit generates a three-phase alternating-current voltage control instruction according to the alternating-current voltage reference vector and the reference phase. By means of the converter control system and method provided in the present application, the oscillation risk can be reduced without using current closed-loop control under steady state and small disturbance conditions, a power grid support characteristic consistent with that of a synchronous generator is simulated in both a steady state and a transient state, and the active adjustment of the impedance of a converter can be realized, thereby improving the grid connection adaptability.
H02J 3/38 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs
29.
METHOD AND APPARATUS FOR DISCRIMINATING CONSISTENCY OF RECEIVING AND SENDING DELAYS OF DIFFERENTIAL CHANNEL, AND ELECTRONIC DEVICE AND DIFFERENTIAL PROTECTION COMMUNICATION SYSTEM
Disclosed in the present application are a method and apparatus for discriminating the consistency of receiving and sending delays of a differential channel, and an electronic device and a differential protection communication system, which are used for a host side or a slave side of a differential channel. The method comprises: calculating a channel delay of a differential channel; adjusting sampling data on two sides of the differential channel to a synchronous state; calculating, in real time, a variation amount of the channel delay, and when the variation amount of the channel delay is greater than a first threshold value, starting to discriminate the consistency of receiving and sending delays of the differential channel, so as to obtain a discrimination result of the consistency of the receiving and sending delays of the channel; and according to the discrimination result of the consistency of the receiving and sending delays of the channel, determining whether to lock differential protection.
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
H02H 3/06 - Circuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions électriques normales de travail avec ou sans reconnexion Détails avec reconnexion automatique
30.
CONTROL METHOD AND CONTROL DEVICE FOR SWITCHING TRIGGER ANGLE OF HIGH-VOLTAGE DIRECT CURRENT TRANSMISSION
Provided are a control method and a control device for switching the trigger angle of a high-voltage direct-current transmission, used for switching a trigger angle control strategy for a high-voltage direct-current transmission. The method comprises: detecting a broadband component of a voltage or current on an alternating-current side or direct-current side of a converter of high-voltage direct-current transmission; judging whether the amplitude of the broadband component exceeds a first starting threshold; when the amplitude of the broadband component exceeds the first starting threshold, the converter of the high-voltage direct-current transmission switching to fixed trigger angle control.
Provided are a method and apparatus for suppressing the broadband oscillation of a converter, and an electronic device and a storage medium, which are used for suppressing the oscillation of a converter system in a broadband range. The method comprises: in accordance with the system requirements of a converter, determining a frequency band range and a target impedance control value of broadband oscillation needing to be suppressed by the converter; calculating the broadband component of an alternating-current bus voltage of the converter in the frequency band range; performing coordinate transformation on the broadband component of at least the alternating-current bus voltage in the frequency band range, and then extracting a broadband feature quantity transformed to a direct-current side; when the amplitude of the broadband component of the alternating-current bus voltage in the frequency band range exceeds or equals the duration of a first starting threshold and is greater than or equal to a first time threshold, and after the broadband feature quantity passes through a phase compensation link and/or a proportioning link, superposing the broadband characteristic quantity to a direct current instruction value, to a direct current voltage instruction value or to an active power instruction value of the converter, and outputting the direct current instruction value, the direct current voltage instruction value or the active power instruction value to modulate the direct current, the direct current voltage or the active power.
The present application aims to provide a thyristor device tester. The thyristor device tester comprises a single-stage test apparatus and a multi-stage test matching apparatus, wherein the single-stage test apparatus is used for performing functional testing on a single thyristor stage; and the single-stage test apparatus is connected to the multi-stage test matching apparatus by means of an interface part for simultaneously performing the functional testing on multiple thyristor stages. On the basis of retaining the function of testing a single thyristor stage, the function of testing a valve module stage (multiple thyristor stages) is added, which not only can meet the requirements of single-thyristor-stage testing and fault analysis and reserve the advantages of light weight and easy carrying, but also can meet the requirement of simultaneously testing multiple thyristor stages, thereby improving the functional test efficiency during routine annual inspection, shortening the test and maintenance time, and increasing the direct current availability.
smaxmax, a current instruction reference value in the instruction current-limiting mode is calculated according to positive sequence voltage source series inductance characteristics, and said current instruction reference value is used as the current instruction reference value.
H02J 3/16 - Circuits pour réseaux principaux ou de distribution, à courant alternatif pour règler la tension dans des réseaux à courant alternatif par changement d'une caractéristique de la charge du réseau par réglage de puissance réactive
H02J 3/18 - Dispositions pour réglage, élimination ou compensation de puissance réactive dans les réseaux
34.
SERIES-TYPE MULTI-WINDING CONVERTER, DIRECT CURRENT TRANSFORMER, AND CONTROL METHOD
Provided are a series-type multi-winding converter, a direct current transformer, and a control method. The series-type multi-winding converter comprises M converter chains (101, 102, ..., 10M) and a first isolation transformer (10c), wherein the M converter chains (101, 102, ..., 10M) are connected in series, a positive terminal of the first converter chain (101) and a negative terminal of the Mth converter chain (10M) constitute a first direct current port (10b) of the series-type multi-winding converter, and M is a positive integer greater than or equal to 2. The first isolation transformer (10c) comprises M first-type windings (10c1) and at least one second-type winding (10c2), and all the first-type windings (10c1) are isolated from each other. All the first-type windings (10c1) are isolated from the second-type windings (10c2), wherein each first-type winding (10c1) is connected to an alternating current port of each converter chain respectively, and the second-type windings (10c2) are connected in combination to form an alternating current port of the series-type multi-winding converter.
H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
35.
COORDINATED CONTROL METHOD AND SYSTEM OF DISTRIBUTED COMPENSATOR, AND COMPUTER DEVICE AND STORAGE MEDIUM
Provided in the present application are a coordinated control method and system of a distributed compensator, and a computer device and a storage medium. The method comprises: assembling a distributed compensator; checking the operating state of each stage of module of each phase of converter; calculating the number of modules, which can effectively output voltages, of the distributed compensator; performing locking and bypassing when each module has a fault; and converting the state of a module, which needs to be subjected to conversion, into a hot standby state.
Provided are a multiport hybrid direct-current circuit breaker and a control method therefor. The multiport hybrid direct-current circuit breaker comprises at least two flow branches (101, …, 10k, …, and 10n), at least two commutator branches (201, …, 20k, …, and 20n), and a disconnecting branch (300). The flow branches (101, …, 10k, …, and 10n) comprise first fast mechanical switches (111, …, 11k, …, and 11n) and one-way commutator switches (121, …, 12k, …, and 12n) connected in series. The flow branches (101, …, 10k, …, and 10n) are connected with each other at one end and constitute a direct-current bus. The commutator branches (201, …, 20k, …, and 20n) comprise diode upper bridge arms (211, …, 21k, …, and 21n) and diode lower bridge arms (221, …, 22k, …, and 22n) connected in series in a same direction. The flow channels (101, …, 10k, …, and 10n) are each connected at the other end in a one-to-one correspondence to the midpoints of the commutator branches (201, …, 20k, …, and 20n) and correspondingly constitute one port. The disconnecting branch (300) comprises a one-way disconnecting switch (310) and a nonlinear resistor (320) connected in parallel. The disconnecting branch (300) and the commutator branches (201, …, 20k, …, and 20n) are connected to each other in parallel and constitute a first common bus and a second common bus.
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
37.
METHOD AND APPARATUS FOR HANDLING DIRECT-CURRENT SIDE LINE FAULT OF VOLTAGE SOURCE CONVERTER
The present application provides a method and apparatus for handling a direct-current side line fault of a voltage source converter, the voltage source converter being provided at a rectification end or an inversion end of any one direct-current electrode in a direct-current power transmission system, the rectification end and the inversion end being connected by means of a direct-current line. The method for handling a fault comprises: acquiring a normal value of a direct-current voltage reference value of the voltage source converter; setting a direct-current current limit target value of the voltage source converter; on the basis of a direct-current current measurement value and the direct-current current limit target value, acquiring a direct-current current limit control output value; on the basis of the normal value of the direct-current voltage reference value and the direct-current current limit control output value, setting a direct-current voltage reference value of the voltage source converter; once a direct-current side line fault is detected, setting the direct-current current limit target value to be zero; and in response to the end of de-ionization, making the direct-current voltage reference value of the voltage source converter climb, and changing the direct-current current limit target value of the voltage source converter.
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
38.
CONTROL METHOD AND SYSTEM FOR ISLAND OPERATION OF VSC-HVDC SYSTEM
The present application provides a control method for island operation of a VSC-HVDC system. The control method comprises: when a VSC-HVDC system is in an island operation, implementing a startup and steady-state operation of a converter in an open-loop control mode in the startup state; when an alternating-current system fault is detected, switching the converter from the open-loop control mode to a double-closed-loop control mode to limit the fault current suppression interference; and in a non-fault state, operating in an adaptive island control mode; or in a non-fault state, implementing the steady-state operation of the converter in the open-loop control mode. When the alternating-current system fails, the fault current suppression interference is limited by switching the fault current into the double closed-loop control mode; during the island operation, by automatically switching to current control without an inner loop, because there is no negative resistance caused by delays such as sampling control, the system is stable, the medium-frequency oscillation problem caused by introducing the negative resistance component due to closed-loop control is avoided, and a more preferred solution is provided for large-scale new energy access.
A modular batch energy acquisition and commutation circuit and a control method. The modular batch energy acquisition and commutation circuit comprises a batch energy acquisition unit and N sub-modules. The alternating current (AC) ends of the N sub-modules are in series connection, N is an integer greater than or equal to two, and each sub-module comprises: a power unit (1) comprising a power semiconductor device, the AC end of the power unit (1) being led out as the AC end of the sub-module; and a capacitor unit (2), which is in parallel connection with the power unit (1). The batch energy acquisition unit comprises: a first energy acquisition power supply (6), the cathode of the first energy acquisition power supply (6) being connected to the cathode of the capacitor unit (2) of the sub-module at the first end among the N sub-modules, or being connected by a current-limiting unit; and a connection network (30), the input end of the connection network (30) being directly connected to the anode of the first energy acquisition power supply (6) or being connected by the current limiting unit, and N output ends of the connection network (30) each being connected to the anodes of the capacitor units (2) or being connected by the current-limiting unit.
The present application provides an automatic closing bypass protection device of a series power module and a control method. The device comprises a first direct-current capacitor branch, a closing trigger unit, an opening trigger unit, and a power-loss protection unit; the closing trigger unit and the first direct-current capacitor branch are connected in parallel to a power supply unit; a bypass switch closing coil and a closing trigger element are connected in series and then are connected in parallel to a second direct-current capacitor. The bypass switch closing coil is closed to control closing of a bypass switch of a power module. The power-loss protection unit comprises a power-loss protection switch connected in parallel to two ends of the closing trigger element, and when it is detected that the output voltage of the power supply unit is reduced to a certain value, the power-loss protection switch is controlled to close, such that the bypass switch closing coil is powered on, and the bypass switch of the power module is closed.
Provided are a direct current circuit breaker and a control method therefor. The direct current circuit breaker comprises: at least two through-current switches, wherein each through-current switch has a first port, a second port and a third port; and a breaking switch, which has a fourth port and a fifth port, wherein the first port of the through-current switch and the fourth port of the breaking switch are respectively connected to a direct current bus of a direct current power grid system, the second port of the through-current switch is respectively connected to the fifth port of the breaking switch, and the third port of the through-current switch is respectively connected to a power transmission line of the direct current power grid system. By means of sharing an expensive breaking switch, the fault protection of a plurality of power transmission lines of a common direct current bus is realized, such that the manufacturing cost of a direct current circuit breaker is reduced, and the characteristic of easily breaking and reclosing at a rated current is also kept.
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
42.
DISTRIBUTED OPTICAL FIBER TEMPERATURE MEASUREMENT APPARATUS AND METHOD USED FOR TRANSFORMER TEMPERATURE MEASUREMENT
A distributed optical fiber temperature measurement apparatus used for transformer temperature measurement, the apparatus comprising a hardware circuit (1), a laser device (2), a detector (3), a wavelength division multiplexer (4) and a temperature-sensing optical fiber orchestration network (5), wherein the hardware circuit (1) is respectively connected to the laser device (2) and the detector (3), the laser device (2) and the detector (3) are both connected to the wavelength division multiplexer (4), and the wavelength division multiplexer (4) is connected to the temperature-sensing optical fiber orchestration network (5); the hardware circuit (1) controls the laser device (2) to emit excitation light, the excitation light enters the temperature-sensing optical fiber orchestration network (5) after passing through the wavelength division multiplexer (4), and the excitation light generates, in the temperature-sensing optical fiber orchestration network (5), scattered light that carries temperature information; backscattered light returns to the wavelength division multiplexer (4) through an original path via the temperature-sensing optical fiber orchestration network (5), and two beams of signal light separated from the wavelength division multiplexer (4) are converted into electrical signals in the detector (3); and the hardware circuit (1) demodulates the temperature information after receiving the electrical signals. The problem of installation and disassembly being complicated when a sensing optical fiber is used for transformer temperature measurement can be solved. Further disclosed is a distributed optical fiber temperature measurement method used for transformer temperature measurement.
G01K 11/32 - Mesure de la température basée sur les variations physiques ou chimiques, n'entrant pas dans les groupes , , ou utilisant des changements dans la transmittance, la diffusion ou la luminescence dans les fibres optiques
43.
METHOD AND APPARATUS FOR CONTROLLING DISTRIBUTED SERIES COMPENSATOR, AND COMPUTER-READABLE MEDIUM
Provided are a method and apparatus for controlling a distributed series compensator, and a computer-readable medium. The distributed series compensator comprises N stages of unit modules, wherein each stage comprises three unit modules which are respectively and correspondingly connected to a three-phase alternating-current circuit; the N stages of unit modules are successively connected to the circuit in series, N being a natural number; and each of the unit modules comprises a firs-type bypass device, an energy acquisition unit, a converter unit and a control unit. The control method comprises: upon receiving a start command, inputting converter units of the N stages of unit modules step by step in a graded manner, and unlocking the converter units after a set first voltage threshold value is reached; and/or, upon receiving a stopping command, gradually reducing an alternating-current voltage output by the N stages of unit modules until same is zero, and then exiting the unit modules. By means of the method, disturbance generated to an alternating-current power grid when a distributed series compensator is started and stopped can be effectively reduced, thereby preventing direct-current overvoltage of unit modules, and realizing stable starting and stopping of the distributed series compensator.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
44.
METHOD AND APPARATUS FOR AUTOMATICALLY ASSOCIATING PRIMARY AND SECONDARY EQUIPMENT MODELS OF SMART SUBSTATION
Disclosed in the present invention are a method and apparatus for automatically associating primary and secondary equipment models of a smart substation: for a cross-interval secondary equipment model, configuring a specific interval prefix for each interval LN (logic node) in the model to implement interval LN grouping, and establishing interval association LN to provide a primary and secondary interval association interface; configuring an SCD file to implement the instantiation of each secondary equipment model, importing an SSD file into the SCD file, directly associating a single-interval secondary equipment CID file with a related primary interval in the SSD, and assigning each interval DO of the interval association LN in a cross-interval secondary equipment CID file to complete interval association; specifying a secondary equipment LN association relationship for a primary equipment object type; and, on the basis of the association relationship between the primary equipment object type and the secondary equipment LN, associating the primary equipment in each interval with the related secondary equipment LN in each single-interval and cross-interval secondary equipment model. The present invention implements the automatic association of primary and secondary equipment models of a smart substation.
A wave head identification method and apparatus based on multi-scale wavelet transform. The method comprises the following steps: obtaining fault traveling wave current data, performing multi-scale wavelet transform on the traveling wave current data, and solving for a modulus maximum set under each scale (S101); by taking a first modulus maximum of a maximum scale as a reference point, performing longitudinal layer-by-layer search towards a small scale, and sequentially solving for a reference point of each scale within a wave head credibility interval (S102); calculating a lateral credibility indicator under each scale on the basis of the reference point of each scale (S103); and finding a minimum scale of a comprehensive credible reference point according to the lateral credibility indicator, locally correcting the reference point under the minimum scale, and taking the time corresponding to the locally corrected reference point as a wave head time (S104). The method can significantly improve the extraction precision of the wave head time when the traveling wave head changes gently.
G01R 31/08 - Localisation de défauts dans les câbles, les lignes de transmission ou les réseaux
G06K 9/00 - Méthodes ou dispositions pour la lecture ou la reconnaissance de caractères imprimés ou écrits ou pour la reconnaissance de formes, p.ex. d'empreintes digitales
46.
ACTIVE MODULAR CONVERTER CHAIN CONTROL METHOD AND CONVERTER CONTROL METHOD
Provided in the present application is an active modular converter chain control method, comprising: on the basis of the number of energy storage sub-modules and the number of non-energy storage sub-modules, calculating the maximum value of the active power outputted by a converter chain; on the basis of the maximum value of the active power, performing correction on a received active power command to acquire an active power correction command; on the basis of the active power correction command, performing correction on a received reactive power command to acquire a reactive power correction command; a control system distributes the active power correction command to the energy storage converter chain, and distributes the reactive power correction command to the non-energy storage converter chain and the energy storage converter chain; the energy storage converter chain executes closed-loop control on the basis of the distributed active power correction command and reactive power correction command; and the non-energy storage converter chain executes closed-loop control on the basis of the distributed reactive power correction command. Power commands are corrected on the basis of the output power capability of the converter chain in order to prevent the control target from exceeding the operating range, increasing reliability.
H02M 7/483 - Convertisseurs munis de sorties pouvant chacune avoir plus de deux niveaux de tension
H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
H02H 7/12 - Circuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour convertisseursCircuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour redresseurs pour convertisseurs ou redresseurs statiques
47.
FLEXIBLE DIRECT-CURRENT TRANSMISSION LINE DISCHARGING METHOD AND APPARATUS, AND STORAGE MEDIUM
Provided are a flexible direct-current transmission line discharging method and apparatus, and a storage medium. The method comprises: unlocking a converter valve; using an additional controller to generate an additional control signal, and superimposing same onto an output reference voltage of a flexible direct-current transmission main controller, such that the converter valve generates a harmonic current between three-phase bridge arms; and when a direct-current line voltage is lower than a constant safe voltage value or when an average voltage of normally operating modules in the bridge arms is lower than the constant safe voltage value, locking a converter.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
48.
CONTROL AND PROTECTION SYSTEM FOR DISTRIBUTED SERIES COMPENSATOR
Provided is a control and protection system for a distributed series compensator. The control and protection system comprises a remote scheduling control layer, an in-station centralized control and protection layer and an in-situ module control layer, which are hierarchically arranged and hierarchically perform controlling, wherein the in-situ module control layer comprises module control and protection layers and module valve base control layers. The remote scheduling control layer obtains a power instruction according to a real-time operation state of an alternating-current power grid; the in-station centralized control and protection layer receives the power instruction and converts same into a voltage instruction for each in-situ series compensation module; each module control and protection layer receives the voltage instruction, and outputs an in-situ series compensation module output voltage instruction; and each module valve base control layer converts the in-situ module output voltage instruction into a turn-on/off command for a power electronic device within the in-situ module control layer.
H02J 3/18 - Dispositions pour réglage, élimination ou compensation de puissance réactive dans les réseaux
H02J 3/06 - Commande du transfert de puissance entre réseaux connectésCommande du partage de charge entre réseaux connectés
H02J 13/00 - Circuits pour pourvoir à l'indication à distance des conditions d'un réseau, p. ex. un enregistrement instantané des conditions d'ouverture ou de fermeture de chaque sectionneur du réseauCircuits pour pourvoir à la commande à distance des moyens de commutation dans un réseau de distribution d'énergie, p. ex. mise en ou hors circuit de consommateurs de courant par l'utilisation de signaux d'impulsion codés transmis par le réseau
49.
CHARGING CONTROL METHOD AND DEVICE FOR HYBRID CONVERTER
The present application provides a charging control method for a hybrid converter, comprising: configuring a first bypass for full-bridge submodules in all bridge arms one by one until the number of first bypasses reaches a first set value or the average voltage of the full-bridge submodules is equal to the average voltage of half-bridge submodules; when the number of first bypasses reaches the first set value and the average voltage of the full-bridge submodules is not equal to the average voltage of the half-bridge submodules, configuring a second bypass for the half-bridge submodules in all the bridge arms one by one until the number of second bypasses reaches a second set value or the average voltage of the full-bridge submodules is equal to the average voltage of the half-bridge submodules; dynamically adjusting the number of first bypasses and the number of second bypasses according to the average voltage of the full-bridge submodules, the average voltage of the half-bridge submodules, and a rated charging voltage; and executing according to the dynamically adjusted number of first bypasses and the dynamically adjusted number of second bypasses until the average voltage of the full-bridge submodules and the average voltage of the half-bridge submodules both reach the rated voltage. In this way, all the submodules steadily reach the rated voltage.
H02M 7/219 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs dans une configuration en pont
50.
CONTROL SYSTEM WITH CROSSED MULTI-RING-NETWORK REDUNDANT NETWORK TOPOLOGY STRUCTURE
Provided are a control system with a crossed multi-ring-network redundant network topology structure. The control system comprises: a control object, which is provided with a plurality of groups of first connection nodes; and a plurality of controlled objects, wherein each controlled object is provided with one or more groups of second connection nodes, wherein any group of first connection nodes of the control object are successively connected to the second connection nodes of at least two controlled objects in the plurality of controlled objects, so as to form a ring network, and the plurality of groups of first connection nodes corresponding to the control object form a plurality of ring networks; and the plurality of ring networks include the plurality of controlled objects. According to the control system of the present application, the connection nodes of the control object can be connected to the plurality of controlled objects, so as to constitute ring networks, such that the number of connection nodes of the control object can be effectively reduced, and the power consumption of the control object is reduced. Moreover, since there are redundant connections between the control object and the controlled objects in the control system, the reliability of the whole control system is improved.
Provided is a control method for a direct-series module-type energy dissipation apparatus. A direct-series module-type energy dissipation apparatus is connected in parallel between direct-current lines, and comprises M direct-series modules and energy dissipation resistors which are connected in series, wherein each direct-series module comprises a first power semiconductor device and a voltage clamp unit; the voltage clamp unit comprises an energy storage unit and a discharge unit; the energy storage unit is connected in parallel to the first power semiconductor device; and the discharge unit comprises a second power semiconductor and an equalization resistor which are connected in series. The control method comprises: when the voltage of a direct-current line is normal, a control apparatus being in a standby mode, and turning on or turning off some second power semiconductor devices, or simultaneously turning on or turning off some of first power semiconductor devices and second power semiconductor devices, so as to adjust a capacitive voltage of a direct-series module; and when the voltage of the direct-current line reaches a starting threshold value, the control apparatus being in an energy dissipation mode, starting the apparatus, and controlling the turning-on and turning-off of energy dissipation resistors, so as to adjust the voltage of the direct-current line.
H02J 3/14 - Circuits pour réseaux principaux ou de distribution, à courant alternatif pour règler la tension dans des réseaux à courant alternatif par changement d'une caractéristique de la charge du réseau par interruption, ou mise en circuit, des charges du réseau, p. ex. charge équilibrée progressivement
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
52.
FAULT REDUNDANCY CONTROL METHOD FOR MODULAR DIRECT CURRENT ENERGY CONSUMPTION APPARATUS
A fault redundancy control method for a modular direct current (DC) energy consumption apparatus. The modular DC energy consumption apparatus is formed by connecting in series a plurality of sub-modules that are in series connection. The control method comprise: adding up the number of faulty sub-modules; according to the number of faulty sub-modules, determining the redundancy mode level, and entering a corresponding redundancy mode, at least one redundancy mode comprising skipping the current redundancy mode when the number of faulty sub-modules reaches the upper threshold of the current redundancy mode, and automatically entering a higher level redundancy mode.
The present application provides an experiment device for a power electronic module and a control method therefor. The device comprises four converter valve segments, a first reactor, a second reactor, a power supply, at least two charging switches, and at least two energy supplement switches. Each converter valve segment comprises at least one submodule connected in series. Negative ends of the four converter valve segments are directly connected to each other. A positive end of the first converter valve segment and a positive end of the second converter valve segment are respectively connected to both ends of the first reactor. A positive end of the third converter valve segment and a positive end of the fourth converter valve segment are respectively connected to both ends of the second reactor. The power supply supplies power to the four converter valve segments. One end of the two charging switches is connected to the power supply, and the other end of the two charging switches is respectively connected to one end of the first reactor and the second reactor. One end of the two energy supplement switches is connected to the power supply, and the other end of the two energy supplement switches is respectively connected to one end of one capacitor of a submodule of any two converter valve segments, so that the energy supplement switches are connected to the capacitor in parallel after being connected to the power supply in series.
Provided in the present application are a control method and control apparatus for a direct current (DC) voltage regulation unit. The control method comprises: using a DC voltage regulation unit to regulate the DC power or DC current or DC voltage of the system in which the DC voltage regulation unit is located to be an instruction value; when a trigger angle or a turn-off angle of a line commutated converter of a current source valve set that is operating in the DC voltage regulation unit or an output voltage modulation ratio of a voltage source converter of a voltage source valve set is lower than a first set value, controlling a current source valve set or a voltage source valve set that is not operating to be put into operation; and when the trigger angle or the turn-off angle of the line commutated converter of the current source valve set that is operating in the DC voltage regulation unit or the output voltage modulation ratio of the voltage source converter of the voltage source valve set is higher than a second set value, controlling the current source valve set that is operating or the voltage source valve set to quit operating.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
55.
TEST SYSTEM AND TEST METHOD FOR CONVERTER STATION IN FLEXIBLE DIRECT CURRENT TRANSMISSION
A test system (2000, 3000, 4000, 5000, 8000, 9000) and a test method for a converter station (200) in flexible direct current (DC) transmission. The test system (2000, 3000, 4000, 5000, 8000, 9000) comprises: a test power source (2100) at a test site; a transformer, which is connected to the test power source (2100) by means of a low voltage alternating current (AC) switch (2200); a converter valve and a DC field device (260), which are connected to the transformer; and a resistor assembly (2400), which is connected between the test power source (2100) and the transformer, or is connected between the transformer and the converter valve and DC field device (260). The resistor assembly (2400) comprises a resistor (2410) and a parallel resistor switch that is in parallel connection with the resistor (2410). The transformer can be a three-winding coupling transformer (230), or can be a transformer that comprises a double-winding coupling transformer (230), a station transformer (220) and an AC bus (210). The described test system fully utilizes the main existing devices in an offshore converter station (200), and uses a low-voltage incoming line installed onshore at the test site so as to complete high-voltage testing of the offshore converter station (200) without needing to additionally build a test platform.
G01R 31/00 - Dispositions pour tester les propriétés électriquesDispositions pour la localisation des pannes électriquesDispositions pour tests électriques caractérisées par ce qui est testé, non prévues ailleurs
56.
MODULAR MULTILEVEL SUB-MODULE, VALVE TOWER, AND ALTERNATING CURRENT WITHSTAND VOLTAGE TEST METHOD
The present invention relates to a modular multilevel sub-module, a valve tower, and an alternating current withstand voltage test method. The modular multilevel sub-module comprises: a direct-current capacitor, power semiconductor units, an energy-taking power supply, a main control circuit, and a supporting metal structural member, wherein the direct-current capacitor comprises a direct-current capacitor anode and a direct-current capacitor cathode and is connected to the power semiconductor units in parallel; the energy-taking power supply takes energy from the direct-current capacitor; the power semiconductor units comprise a power semiconductor device, a heat-dissipation device, and an alternating current output port; the energy-taking power supply comprises a power supply metal housing; the main control circuit comprises a circuit metal housing; the direct-current capacitor cathode serves as an equipotential point; and one or more of the power supply metal housing, the circuit metal housing, the heat-dissipation device, and the supporting metal structural member form an equipotential connection surface, and the equipotential connection surface is electrically connected to the equipotential point. According to the present invention, the anti-interference capability of the modular multilevel sub-module is improved by means of equipotential connection of metal parts in the modular multilevel sub-module.
A multi-voltage level direct current grid system and a control protection method, the direct current grid system comprising: at least two direct current buses; at least one direct current transformer, one end of which is connected to a first direct current bus while another end is connected to a second direct current bus or a lead-out wire, which may achieve direct current voltage conversion; and at least one lead-out wire current limiter, one end of the lead-out wire current limiter being connected to the second direct current bus while another end is connected to the lead-out wire; the lead-out wire current limiter comprises a first current-limiting unit, and the first current limiting unit comprises a group of direct current switches, as well as a first bypass switch and a first current-limiting resistor unit that are connected in parallel.
H02H 9/02 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de courant
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
H02J 1/08 - Systèmes à trois filsSystèmes ayant plus de trois fils
H02H 1/00 - Détails de circuits de protection de sécurité
58.
BIDIRECTIONAL ENERGY BALANCE CONVERTER CHAIN, ELECTRIC ENERGY ROUTER, AND CONTROL METHOD
The present application provides a bidirectional energy balance converter chain, comprising M power units. The M power units each comprise two alternating-current terminals, and the alternating-current terminals of adjacent power units are sequentially connected in series. There are N multi-port balancing units, N being an integer greater than or equal to 1 and less than or equal to M; the number P of ports of the multi-port balancing units is 3 or 4; when P is 3, the multi-port balancing units each comprise first, second, and third ports, and the third port is connected to a positive electrode or negative electrode of a first direct-current capacitor; when P is 4, the multi-port balancing units each comprise first, second, third, and fourth ports; the first port of the multi-port balancing unit at a head end leads out and is defined as a first balancing port, and the second port is connected to the first port of the multi-port balancing unit adjacent thereto; the remaining ports are sequentially connected in this manner; the second port of the multi-port balancing unit at a tail end leads out and is defined as a second balancing port. The present invention further provides an energy router consisting of the bidirectional energy balance converter chain, and a control method.
A bipolar bidirectional DC converter comprises at least two valve group series (101, 102) and at least six magnetic elements (103), and said valve group series are divided into a Type-I valve group series (102) and a Type-II valve group series (101) each valve group series (101, 102) comprises a high-voltage DC port, a low-voltage DC port and at least three AC ports, and each AC port is connected to a magnetic element (103); and the other ends of the magnetic elements (103), which are connected to all the AC ports in the same valve group series (101, 102), are connected.
H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
The invention relates to an island converter overload limit method and device for a bipolar flexible DC transmission system, and belongs to the field of DC transmission. During stable island operation, both bipolar converters adopt a voltage-frequency droop control strategy; and once it is detected that one converter is overloaded, the control mode of the overloaded converter is automatically switched to active-wattless power control from voltage-frequency droop control to fulfill an overload limit function. The method effectively avoids an overload of the bipolar flexible DC transmission system under island operation, effectively maintains the AC voltage and frequency stable, and has important guiding significance for applying island systems to DC power grids.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
H02J 3/38 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs
61.
INTERLINE POWER TRANSFER APPARATUS APPLICABLE TO MULTIPLE GROUPS OF MULTI-CIRCUIT LINES
Provided is a line power transfer apparatus applicable to multiple groups of multi-circuit line transmission channels, the apparatus comprising N groups of series compensation apparatuses, wherein each group of series compensation apparatuses is connected to one group of line transmission channels, and each group of series compensation apparatuses comprises series transformers, bypass switches, and one voltage source converter. A first side winding of each series transformer and at least one bypass switch are connected in parallel and are then respectively connected in series to each circuit of the group of transmission channels; three-phase outgoing lines of second side windings of all the series transformers are connected in parallel in a split-phase manner, and are then connected to the alternating current side of the voltage source converter of the group of series compensation apparatuses in a split-phase manner; and the direct current sides of the voltage source converters of the N groups of series compensation apparatuses are connected in parallel. According to the power transfer apparatus provided by the present invention, the system structure is simplified while guaranteeing the performance, the total quantity and total capacity of voltage source converters are reduced, thereby lowering the costs and the occupation of same, the difficulty in terms of control and protection is reduced, and the reliability of the system is improved.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
62.
ULTRA-HIGH-VOLTAGE DIRECT CURRENT HIGH-END CONVERTER VALVE AREA GROUNDING FAULT CONTROL METHOD AND CONTROL DEVICE
The present application provides an ultra-high-voltage direct current high-end converter valve area grounding fault control method and control device. An ultra-high-voltage direct current transmission system comprises at least one rectifier station and at least one inverter station. The rectifier station and the inverter station comprise single direct current pole or two direct current poles. The direct current pole comprises at least two converters connected in series. When the direct current pole where a high-end converter is located operates in the whole valve group, and it is detected that a grounding fault occurs in the valve area of the high-end converter, the control method comprises: controlling the blocking of the high-end converter; controlling the minimum current flowing through a fault point; isolating the high-end converter; and controlling the ultra-high-voltage direct current transmission system to resume normal operation.
H02J 3/26 - Dispositions pour l'élimination ou la réduction des asymétries dans les réseaux polyphasés
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
63.
Longitudinal differential protection method of transformer
A longitudinal differential protection method for a transformer comprises: calculating a corrected parameter of a transformer according to a voltage and electrical parameters of the transformer, wherein the electrical parameters of the transformer comprise a rated capacity of the transformer, and the corrected parameter of the transformer comprise a capacity of the transformer.
Provided are a control method and control apparatus for a direct-current side grounding fault of a high-voltage direct-current power transmission system. The control method comprises: controlling at least one current converter at each of two ends of a grounding fault to continue to operate; on the basis of a requirement of a high-voltage direct-current power transmission system, determining a direct-current reference value of two current converters at the two ends of the grounding fault, wherein the two current converters comprise a current converter at each of the two ends of the grounding fault that continues to operate; on the basis of the direct-current reference value, controlling the direct current of the two current converters to be equal; if the grounding fault occurs in a rectifier station or an inverter station, controlling the two current converters to operate normally after controlling the high-voltage direct-current power transmission system to isolate the grounding fault, or controlling the high-voltage direct-current power transmission system to isolate the grounding fault after controlling the two current converters or a direct-current electrode where the two current converters are located to lock; and if a grounding fault occurrence area is in a direct-current line or a grounding electrode line, after a de-ionization time has elapsed or after it is detected that the grounding fault disappears, controlling the two current converters to operate normally.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
65.
EARTH FAULT CONTROL METHOD FOR VALVE REGION OF ULTRA-HIGH-VOLTAGE DIRECT CURRENT LOW-VOLTAGE-END CONVERTER, AND CONTROL DEVICE
The present application provides an earth fault control method for a valve region of an ultra-high-voltage direct current low-voltage-end converter, and a control device. The control method and the control device are applicable to a low-voltage-end converter of a direct current pole of an ultra-high-voltage direct current power transmission system, wherein the ultra-high-voltage direct current power transmission system comprises two direct current poles, the direct current poles comprise at least two converters connected in series, and the low-voltage-end converter is a converter near a neutral-polarity bus. The control method is applicable to the case in which the two direct current poles of the ultra-high-voltage direct current power transmission system are operating, an entire valve group at a direct current pole of the low-voltage-end converter is operating, and an earth fault at a valve region of the low-voltage-end converter is detected, and comprises: controlling a blocking operation of the low-voltage-end converter; controlling the two direct current poles of the ultra-high-voltage direct current power transmission system to have an equal direct current; isolating the low-voltage-end converter; and enabling converters other than the low-voltage-end converter to continue operations.
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
66.
ONLINE FAULT DETECTION METHOD AND DEVICE FOR ARMATURE SIDE OF BRUSHLESS EXCITER
An online fault detection method and device for an armature side of a brushless exciter. The method comprises: collecting an exciting winding current of the exciter, calculating a direct current component and a total harmonic amount of the exciting winding current, calculating a related ratio of the total harmonic amount to the direct current component, and performing fault determination by comparing the calculated related ratio with a corresponding set threshold value. The detection method and device are used for implementing online fault detection for the armature side of the brushless exciter.
An inline ejection circuit, an ejection method, and an ejection apparatus for a hybrid direct-current converter. The converter comprises a current source-type valve set unit and a voltage source-type valve set unit connected in series. The current source-type valve set unit comprises an electrical grid commutated converter (1). The voltage source-type valve set unit comprises a voltage source converter (2). The ejection circuit comprises: a first valve set switch (5), connected to the electrical grid commutated converter (1) and to the voltage source valve set unit; a first bus switch (12), connected to the electrical grid commutated converter (1) and to a direct-current bus or a neutral bus, or connected to the voltage source converter (2) and to a direct-current bus or a neutral bus; a first bypass switch (4), connected in parallel to a series circuit of the first valve set switch (5) and the electrical grid commutated converter (1); a second valve set switch (9), connected to the voltage source converter (2) and to the current source-type valve set unit, and/or a second bus switch (10), connected to the voltage source converter (2) and to the direct-current bus or the neutral bus; and a second bypass switch (8), connected in parallel to a series circuit of the voltage source converter (2) and the second valve set switch (9) and/or the second bus switch (10).
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
68.
CONTROL SYSTEM OF DIRECT-CURRENT ENERGY CONSUMPTION DEVICE AND CONTROL METHOD THEREFOR
A control system of a direct-current energy consumption device and a control method therefor. The system comprises a flexible direct-current control protection system and an energy consumption device control system. The control method comprises the following steps: the flexible direct-current control protection system collects alternating/direct-current signals and equipment operation states of a flexible direct-current power transmission system and sends a direct-current energy consumption on-off instruction and surplus power to the energy consumption device control system when an alternating-current system breaks down and satisfies on-off conditions; if the communication is normal, the energy consumption device control system inputs energy consumption power in combination with the state of the energy consumption device according to a direct-current energy consumption on-off instruction and a surplus power value sent by the flexible direct-current control protection system; and if the communication fails, the energy consumption device control system inputs energy consumption power as required according to direct-current voltage and current signals acquired by the energy consumption device control system. According to the method, the required energy consumption power can be accurately input according to different fault types and communication states of the control system, the direct-current voltage in the fault period is stably controlled, and the stability and reliability of the power transmission system are improved.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
H02J 3/12 - Circuits pour réseaux principaux ou de distribution, à courant alternatif pour règler la tension dans des réseaux à courant alternatif par changement d'une caractéristique de la charge du réseau
69.
Coordinated control method and device for series voltage source converter valve group
A coordinated control method for series voltage source converter valve groups comprises: allocating a total direct-current voltage reference value or a total active power reference value at the end where a direct-current electrode series voltage source converter valve group is located according to the total number of voltage source converter valve groups in series; for a direct-current voltage control end, controlling the direct-current voltage of each valve group according to the assigned direct-current voltage reference value for each valve group; for an active power control end, controlling the active power of each valve group according to the assigned active power reference value for each valve group and based on adding the active power compensation amount of the valve group which has voltage equalization effects on the valve group. Correspondingly, also providing a coordinated control device for series voltage source converter valve groups. The direct-current voltage equalization of each valve group in operation of the direct-current voltage control end or the active power control end of the series voltage source converter valve group is achieved.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
H02M 7/25 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs agencés pour la marche en série, p. ex. pour la multiplication de la tension
H02M 1/00 - Détails d'appareils pour transformation
70.
METHOD EMPLOYING PACKET REPLACEMENT TO IMPLEMENT SECURITY PERMISSION FOR REMOTE OPERATION OF POWER GRID DISPATCHING
A method employing packet replacement to implement security permission for remote operation of power grid dispatching, comprising: adding an operation permission security gateway to a network channel of a communication exit of a front-end processor of a dispatching end, wherein after determining, by means of authentication, that an identity is valid, a Ukey-based security permission module built into the gateway inputs a permission instruction indicating whether a current operation is permitted, and after receiving an instruction indicating that the current operation is not permitted, an operation security control module in the gateway performs recognition on original packets; directly forwarding a non-operation packet without making any modification thereto; and configuring an application layer data segment of an operation packet to be zero, forwarding the same, not changing the other network protocol layers of the packet, and forwarding the same, such that the passing operation packet is modified to be invalid, without changing a communication process, so as to block execution of an operation command. The present invention achieves, without changing a routing parameter for dispatching communication, safety management and control for determining whether to permit execution of an operation command, has good adaptability, is easy to use, is safe and effective, and achieves non-inductive intervention.
A conversion circuit, a front-end circuit, a sub-module, a direct current converter, and a control method. The conversion circuit comprises a front-end circuit and at least one multi-level bridge arm (1103). The front-end circuit comprises a series capacitor branch (1101) and a clamp module (1102). The series capacitor branch (1101) comprises M switched capacitor modules (11011-1101M), M being a natural number greater than or equal to 2. The switched capacitor modules (11011-1101M) comprise a capacitor and a first turn-off device. The first turn-off device is connected in series with the capacitor. By means of the on or off of the first turn-off device, the on and off of the charge/discharge loop of the capacitor is controlled. One end of each switched capacitor module except the first switched capacitor module is connected to the clamp module (1102). The number of levels of the multi-level bridge arm (1103) is M+1. The multi-level bridge arm (1103) comprises 2M series-connected full-control switching devices including an anti-parallel diode, and one terminal is led out from the negative electrode of each full-control switching device except the Mth and 2Mth full-control switching devices for connection to the clamp module (1102).
H02M 7/5387 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs, p. ex. onduleurs à impulsions à un seul commutateur dans une configuration en pont
72.
VOLTAGE SOURCE CONVERTER UNIT AND ONLINE INPUT METHOD, AND VOLTAGE SOURCE CONVERTER VALVE
The present application relates to an online input method of a voltage source converter unit. The voltage source converter unit comprises a voltage source converter and a bypass switch connected to a direct current side of a voltage source converter in parallel, wherein the bypass switch is in a closed state before the voltage source converter unit is inputted. The method comprises: superposing a harmonic voltage on a direct-current voltage reference value of the voltage source converter; and when a current flowing through the bypass switch has a zero crossing point satisfying a preset requirement, turning off the bypass switch.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
73.
DISTRIBUTED DIRECT CURRENT ENERGY CONSUMPTION DEVICE, CONTROL METHOD THEREFOR, AND CONTROL MODULE THEREOF
The present application provides a distributed direct current energy consumption device, a control method therefor, and a control module thereof. The control method comprises: calculating, on the basis of the energy consumption power of the distributed direct current energy consumption device, a first number of energy consumption submodules required to be input; calculating, on the basis of a direct current busbar voltage measurement value and a direct current busbar voltage control target value, a second number of energy consumption submodules required to be input; using the sum of the first number and the second number as the total number of energy consumption submodules required to be input; and on the basis of the total number, controlling to input or exit the energy consumption submodule.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
74.
LIQUID LEAKAGE FLOW DETECTION DEVICE, DETECTION METHOD AND CONVERTER VALVE
Provided are a liquid leakage flow detection device, a detection method, and a converter valve. The liquid leakage flow detection device comprises: a container (100) for holding leaked liquid, comprising a water inlet (101) and a water outlet (102); a liquid detection module (200), comprising a detection probe (201), the detection probe (201) is in contact with the leaked liquid to generate a signal, the liquid detection module (200) transmits the signal; a lifting mechanism (300) for arranging the liquid detection module (200) on the container (100) and adjusting the height of the detection probe (201) relative to the bottom of the container (100). The liquid leakage flow detection device can adjust the size of a leakage flow threshold and improve the product adaptability.
G01F 1/52 - Mesure du débit volumétrique ou du débit massique d'un fluide ou d'un matériau solide fluent, dans laquelle le fluide passe à travers un compteur par un écoulement continu en utilisant des effets mécaniques en mesurant la hauteur du niveau du fluide atteinte dans un réservoir par l'effet de la force ascendante de l’écoulement du fluide
75.
CONVERTER APPARATUS AND ASSEMBLY, REACTIVE POWER COMPENSATION APPARATUS, AND CONVERTER THEREOF, AND CONTROL METHOD THEREFOR
A converter apparatus and an assembly, reactive power compensation apparatus, and converter thereof, and a control method therefor. The converter apparatus (1000) comprises: a switching unit (U1), which comprises a first controllable semiconductor device (Q1) and a second controllable semiconductor device (Q2) which are connected in series; a capacitor (C1), which is in parallel connection with the switching unit (U1); an energy-consuming voltage-equalizing unit (U2), which is connected in parallel to the capacitor (C1), and which comprises a first resistor (R1) and a second resistor (R2) connected in series, as well as a third controllable semiconductor device (Q3), said third controllable semiconductor device (Q3) being connected in parallel to the first resistor (R1).
The present application provides a directly serially-connectable module, a converter chain, a converter, a control method, a device, and a medium. The directly serially-connectable module comprises a switch unit and a voltage clamp unit. The switch unit comprises a first power semiconductor device. The voltage clamp unit comprises a second power semiconductor device and a resistor-capacitor unit, the resistor-capacitor unit being serially connected to the second power semiconductor device.
The present application relates to a valve layer of a converter valve, and a converter valve. The valve layer of the converter valve comprises: a first valve module; a second valve module disposed side by side with the first valve module; and an electrical connection member electrically connecting the first valve module to the second valve module in series in a diagonal manner.
H02M 7/00 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continuTransformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif
78.
DIRECT-CURRENT ENERGY DYNAMIC REGULATION SYSTEM AND CONTROL METHOD THEREFOR
The present application provides a direct-current energy dynamic regulation system and a control method therefor. The direct-current energy dynamic regulation system comprises N voltage-equalizing energy dissipation modules connected in series in the same direction, M sub-module control units and a main control unit, wherein M ≤ N, and N is an integer greater than or equal to 2. Each of the voltage-equalizing energy dissipation modules comprises a direct-current capacitor and an energy dissipation branch which are connected in parallel, the energy dissipation branch comprising a first power semiconductor device, an energy dissipation resistor and a bypass switch, the energy dissipation resistor being connected to the first power semiconductor device in series, and the bypass switch being connected to the first power semiconductor device in parallel; each of the sub-module control units comprises at least two communication units; the main control unit comprises a first group of communication units, the first group of communication units comprising at least one communication unit; and the communication units of the M sub-module control units are connected in series and are then connected to any one of the communication units among the first group of communication units of the main control unit, so as to form a communication network.
H02J 1/00 - Circuits pour réseaux principaux ou de distribution, à courant continu
H02J 13/00 - Circuits pour pourvoir à l'indication à distance des conditions d'un réseau, p. ex. un enregistrement instantané des conditions d'ouverture ou de fermeture de chaque sectionneur du réseauCircuits pour pourvoir à la commande à distance des moyens de commutation dans un réseau de distribution d'énergie, p. ex. mise en ou hors circuit de consommateurs de courant par l'utilisation de signaux d'impulsion codés transmis par le réseau
The present application relates to a converter valve, comprising at least two converter valve layers and at least one electrical connection member. The at least two converter valve layers are stacked upon one another. The adjacent converter valve layers of the at least two converter valve layers are electrically connected in series in a diagonal manner by means of one of the at least one electrical connection member.
H02M 7/00 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continuTransformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif
A solid-state transformer, comprising a plurality of power units (100). Each power unit (100) comprises a high-voltage side module (110), a low-voltage side module (120), and an isolation transformer (130). The isolation transformer (130) comprises a high-voltage winding (131), a low-voltage winding (132), and an iron core (133). The high-voltage winding (131) is wound on the iron core (133) and connected to the high-voltage side module (110). The low-voltage winding (132) is wound on the iron core (133) and connected to the low-voltage side module (120). The iron core (133) is in near equipotential connection to the high-voltage side module (110) or the low-voltage side module (120) by means of a conductive medium to fix the floating potential of the iron core (133).
H02M 5/458 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant alternatif, p. ex. pour changement de la tension, pour changement de la fréquence, pour changement du nombre de phases avec transformation intermédiaire en courant continu par convertisseurs statiques utilisant des tubes à décharge ou des dispositifs à semi-conducteurs pour transformer le courant continu intermédiaire en courant alternatif utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
81.
MULTI-PORT ENERGY ROUTER, AND CONTROL SYSTEM AND CONTROL METHOD THEREOF
Disclosed in the present invention is a multi-port energy router, comprising no less than 2 multi-port modules; each multi-port module comprises a first common port and a second common port and at least one remaining port. The first common port is a direct-current port and is connected to a direct-current bus or is suspended, the second common port is connected to an alternating-current bus or a direct-current bus, and all the remaining ports is able to be customized according to actual usage requirements. Such structure can provide a multi-port power supply solution having distributed characteristics, satisfying applications of various forms of electric energy of different voltage levels, and being able to well solve a voltage balance problem existing in the prior art. Also disclosed in the present invention are a control system and a control method for a multi-port energy router.
The present application provides a protection method, apparatus and system for a pseudo-bipolar direct-current power distribution network, and a device and a medium. The method comprises: detecting a transverse differential current value of a first direct-current switch of the pseudo bipolar direct-current power distribution network, the transverse differential current value being an absolute value of the difference between a positive-pole current amplitude and a negative-pole current amplitude of the first direct-current switch; generating first transverse differential out-of-limit signals in response to a condition that the transverse differential current value is greater than a preset transverse differential out-of-limit threshold; detecting second transverse differential out-of-limit signals of a subordinate direct-current switch of the first direct-current switch; and determining that the fault of the first direct-current switch is an internal fault in response to a condition that the first transverse differential out-of-limit signals have been generated and the second transverse differential out-of-limit signals of the subordinate direct-current switch of the first direct-current switch are not detected, and performing fault protection.
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
H02H 3/26 - Circuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions électriques normales de travail avec ou sans reconnexion sensibles à la différence de tensions ou de courantsCircuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions électriques normales de travail avec ou sans reconnexion sensibles à un angle de déphasage entre tensions ou courants
G01R 19/10 - Mesure d'une somme, d'une différence, ou d'un rapport
83.
Redundant energy acquisition circuit of power module, and control method thereof
A redundant energy acquisition circuit of a power module includes at least one power semiconductor device, a first capacitor, and a first bypass switch. The redundant energy acquisition circuit of the power module includes: a power supply board acquiring energy from the first capacitor, supplying power to a control board, and charging a discharge circuit. A first charging circuit has one end connected to a positive electrode of the first capacitor and another end connected to the discharge circuit, and charges the discharge circuit when the power supply board is not operating normally. The control board controls the discharge circuit to close. The discharge circuit discharges and triggers the first bypass switch to close after the discharge circuit is closed.
An offshore wind power direct current grid-connected system platform used for an offshore wind farm, the system platform comprising a main system sub-platform (A), an auxiliary system sub-platform (B) and one or more covered bridges (C). The main system sub-platform (A) comprises a grid-connected system and a power delivery conversion device. The auxiliary system sub-platform (B) comprises a supportive auxiliary device. The covered bridges (C) physically and electrically connect the two platforms, and have a fireproof function. In the described solution, an original large-scale offshore platform is divided into two easy-to-construct sub-platforms by means of technology integration and optimization, which reduces the dimensions and size of a single offshore platform, reduces the weight of a single platform, and reduces the fabrication costs and difficulty of offshore construction. Additionally, living and working areas for personnel are provided on the grid-connected auxiliary system sub-platform (B), and isolation measures are set up between same and a grid-connected system main platform portion, which has better safety performance.
H02J 3/38 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs
H02J 5/00 - Circuits pour le transfert d'énergie électrique entre réseaux à courant alternatif et réseaux à courant continu
E05F 15/71 - Mécanismes pour battants mus par une force motrice avec déclenchement automatique sensible à des variations de température, à la pluie, au vent ou au bruit
An alternating current conversion device (11), comprising three four-port phase units (5). Each four-port phase unit (5) comprises a plurality of alternating current conversion modules (4); input ends of the plurality of alternating current conversion modules (4) are sequentially connected in series to form a first input port and a second input port of the four-port phase unit (5); output ends of the plurality of alternating current conversion modules (4) are sequentially connected in series to form a first output port and a second output port of the four-port phase unit (5); the three four-port phase units (5) are respectively used as phase A, phase B and phase C in the alternating current conversion device (11); there are four connection modes of the three four-port phase units (5). According to the alternating current conversion device (11), interconnection of two alternating current lines is achieved by using four optional connection modes, and the most appropriate connection mode can be obtained by matching according to the requirements of different power grids; faults of the two lines can be reliably isolated, and quick power support of a non-fault line for a faulty line can be achieved.
H02M 7/49 - Combinaison des formes de tension de sortie d'une pluralité de convertisseurs
H02M 7/5387 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs, p. ex. onduleurs à impulsions à un seul commutateur dans une configuration en pont
86.
HIGH VOLTAGE DIRECT CURRENT TRANSMISSION CONVERSION UNIT, CONTROL METHOD AND DEVICE, AND SYSTEM MAIN CIRCUIT
The present application provides a high voltage direct current transmission conversion unit, a control method and device, and a system main circuit. The high voltage direct current transmission conversion unit comprises a first current source type valve set, a first current conversion transformer, and a direct current voltage-regulating unit; the first current conversion transformer does not have a voltage-regulating function; the net side of the first current conversion transformer is connected to an alternating current system; the valve side of the first current conversion transformer is connected to the alternating current side of the first current source type valve set; the direct current voltage-regulating unit comprises one or more voltage source type valve sets and/or a current source type valve set, and has the function of regulating direct current and voltage; the first current source type valve set is connected in series with the direct current voltage-regulating unit at a direct current side.
H02M 7/162 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type thyratron ou thyristor exigeant des moyens d'extinction utilisant uniquement des dispositifs à semi-conducteurs dans une configuration en pont
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
H02M 1/32 - Moyens pour protéger les convertisseurs autrement que par mise hors circuit automatique
87.
METHOD FOR REDUNDANT SAMPLING AND ABNORMALITY DETERMINATION FOR RELAY PROTECTION
Disclosed in the present application is a relay protection redundant sampling detection method, comprising: acquiring sampled value 1 and sampled value 2 of a measured voltage/current after redundant sampling; and performing redundant sampling abnormality determination according to the instantaneous value difference and instantaneous value sum of sampled value 1 and sampled value 2, as well as secondary voltage/secondary current ratings. The present application can quickly determine the redundant sampling abnormality, so as to quickly block the quick-action section protection without delay and prevent incorrect operation of a relay protection device.
H02H 3/05 - Circuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions électriques normales de travail avec ou sans reconnexion Détails avec des moyens pour accroître la fiabilité, p. ex. dispositifs redondants
H02H 3/04 - Circuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions électriques normales de travail avec ou sans reconnexion Détails avec signalisation ou supervision additionnée à la déconnexion, p. ex. pour indiquer que l'appareil de protection a fonctionné
88.
CURRENT-LIMITING CONTROLLABLE LIGHTNING ARRESTER, CONVERTER, POWER TRANSMISSION SYSTEM, AND CONTROL METHOD
The present application provides a current-limiting controllable lightning arrester, a converter, a power transmission system, and a control method. The current-limiting controllable lightning arrester comprises a first lightning arrester and a variable lightning arrester which are connected in series; the variable lightning arrester comprises a second lightning arrester and a bypass branch which are connected in parallel; and the bypass branch comprises a first bypass switch.
Provided in the present invention are a valve tower reinforcing structure and a reinforcing method, which are mainly for valve towers that have three or more layers; four corners of a valve section side surface of each layer of a valve tower is provided with connecting flanges, and connecting rods are used to connect connecting flanges corresponding to adjacent valve towers on the same bridge arm to implement lateral reinforcement. The connection means for lateral reinforcement mainly comprises: horizontal connection, interleaving connection, and cross-layer connection. In an environment in which flexible straight valve towers are subjected to long-term jolting and relatively strong vibrations, the present invention provides a variety of reinforcement solutions, the reinforcement structure is simple and effective, is highly reliable, has strong operability and is easy to disassemble, and the stability and safety of valve towers during transport and operation processes are enhanced.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
90.
Direct current voltage coordination control method
A DC voltage coordination control method is applied to a multi-terminal VSC-HVDC power transmission system or a VSC-HVDC power grid system. When a lower-level control is used in the active power control mode, the active power reference value of the converter is generated according to the converter DC voltage and the converter DC voltage active power curve; it also includes an upper-level control to adjust the control mode and active power setting value of the lower-level control to ensure the steady-state performance of the system. This method has low dependence on communication, avoids the problem that the fixed slope and margin cannot meet all operating conditions, and is suitable for large-scale VSC-HVDC systems, and has scalability.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
H02J 3/12 - Circuits pour réseaux principaux ou de distribution, à courant alternatif pour règler la tension dans des réseaux à courant alternatif par changement d'une caractéristique de la charge du réseau
H02J 1/10 - Fonctionnement de sources à courant continu en parallèle
91.
METHOD FOR ENERGIZING AND DEPLOYING MODULAR MULTI-LEVEL CONVERTER, AND CONTROL SYSTEM
A method for energizing and deploying a modular multi-level converter and a control system. The method employs a device for energizing and deploying a modular multi-level converter, and comprises: operating an additional circuit, such that a direct current port of the device is equivalent to a short circuit, and a direct current port of the modular multi-level converter is equivalent to an open circuit; closing an alternating current switch, performing pre-charging on the modular multi-level converter, and performing detection on an anomalous sub-module condition of the modular multi-level converter; if a sub-module anomaly is detected, excluding all sub-modules, disconnecting the alternating current switch, and processing the sub-module anomaly until there is no sub-module anomaly; operating the additional circuit, such that the direct port of the device is equivalent to a short circuit, and the direct current port of the modular multi-level converter is equivalent to a short circuit; implementing a charging policy on the modular multi-level converter until a deployment condition is met; and operating the additional circuit, and deploying the modular multi-level converter in a direct current operation circuit.
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
92.
FLEXIBLE ACCESS SUBSTATION AND CONTROL METHOD THEREFOR
Disclosed is a flexible access substation. The flexible access substation comprises N sets of frequency conversion access systems, wherein N is an integer greater than or equal to 1; each set of frequency conversion access system comprises a first AC-DC-AC converter, a first output circuit breaker, and a first power distribution system; the first power distribution system comprises one AC incoming line, an AC bus, and at least one outgoing line; an output side of the AC-DC-AC converter is connected to one end of the AC incoming line of the first power distribution system by means of the first output circuit breaker. Also disclosed is a control method for the flexible access substation. By means of the method, a set of converters can be simultaneously connected to vessels in a plurality of berths, and a docking vessel can access a shore power in a plug-and-play manner, so that investment costs of a shore power device are reduced, convenience of accessing the shore power is improved. In an interconnection mode, mutual support between AC buses can be implemented with high reliability.
The present invention provides a series compensator and a control method. The series compensator includes a series transformer, a series transformer bypass device, a voltage source converter, a high-speed converter bypass device, a high-speed switch, and a reactor. The reactor and the high-speed switch are connected in parallel to form a current limiting module; one winding of the series transformer has two ends connected in series to a line, and the other winding thereof is sequentially connected to the current limiting module and the high-speed converter bypass device; the voltage source converter and the high-speed converter bypass device are connected in parallel; and at least one winding of the series transformer are connected in parallel to at least one series transformer bypass device. The series compensator of the present invention indirectly provides the current limiting module, so as to effectively limit the short-circuit current of a system, reduce the fault current to which the compensator is subjected, and improve the reliability of an alternating current system and the series compensator. Moreover, the current limiting module has a low voltage level, and the high-speed switch has a small breaking current, thereby providing good industrial applicability.
H02H 9/02 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de courant
H02H 7/125 - Circuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour convertisseursCircuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour redresseurs pour convertisseurs ou redresseurs statiques pour redresseurs
G05B 15/02 - Systèmes commandés par un calculateur électriques
H02J 3/00 - Circuits pour réseaux principaux ou de distribution, à courant alternatif
H02J 13/00 - Circuits pour pourvoir à l'indication à distance des conditions d'un réseau, p. ex. un enregistrement instantané des conditions d'ouverture ou de fermeture de chaque sectionneur du réseauCircuits pour pourvoir à la commande à distance des moyens de commutation dans un réseau de distribution d'énergie, p. ex. mise en ou hors circuit de consommateurs de courant par l'utilisation de signaux d'impulsion codés transmis par le réseau
H01H 33/66 - Interrupteurs dans lesquels la coupure s'effectue dans le vide
H01H 79/00 - Interrupteurs de protection dans lesquels un courant excessif provoque la fermeture des contacts, p. ex. pour court-circuiter l'appareil à protéger
94.
Voltage and current control method and device for direct-current power transmission system
Disclosed in the present invention is a voltage and current control method for a direct-current transmission system. The method comprises: calculating a DC voltage reference value of a voltage source converter of a DC voltage control end, on the basis whether a direct-current voltage end of a direct-current pole of a direct-current transmission system substantially controls a direct-current voltage; using ½ of the calculated direct-current voltage reference value of the voltage source converter as a bridge arm voltage direct-current bias, calculating a difference between the direct-current voltage reference value of the voltage source converter and a measured direct-current voltage value, and inputting the difference into a direct-current voltage control outer loop of the voltage source converter to perform closed-loop control, so as to control the direct-current voltage or the direct current of the direct-current pole. Correspondingly, also provided is a voltage and current control device for the direct-current transmission system. By the means of the present invention, the direct-current voltage and the direct current of the direct-current transmission system provided with the voltage source converter can be effectively controlled.
Disclosed are a distributed grounding line selection system and method. The system comprises a grounding line selection apparatus and zero-sequence current collection apparatuses corresponding to all branches, wherein the grounding line selection apparatus is connected to each zero-sequence current collection apparatus by means of a ring network; the zero-sequence current collection apparatus in each branch is used for collecting a zero-sequence current sampling value and switch quantity information of the branch; and collected data is sent to the grounding line selection apparatus by means of the ring network, and a grounding line selection function is completed by means of the grounding line selection apparatus. By means of this technical solution, the problem of the wiring of the present small-current grounding line selection apparatus being complex can be solved, a current is collected by means of communication, and the difficult problem of a high sampling rate transmission being required by a grounding line selection apparatus is solved by means of a new transmission mode.
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
96.
Method and device for quickly eliminating ferromagnetic resonance of voltage transformer
The present invention discloses a method for quickly eliminating ferromagnetic resonance of a voltage transformer. The method includes: first sampling a three-phase voltage and an open-delta voltage of a voltage transformer; calculating a flux linkage corresponding to a zero-sequence voltage by means of an integral algorithm; and when detecting that ferromagnetic resonance occurs in the mutual inductor, further checking whether the absolute value of the flux linkage corresponding to the zero-sequence voltage or the absolute value of the open-delta voltage respectively falls within a set range, and if yes, starting a secondary resonance elimination loop for resonance elimination. The present invention also discloses a corresponding device for quickly eliminating ferromagnetic resonance of a voltage transformer. The present method and device accurately analyze and control resonance elimination trigger time based on a conventional secondary resonance elimination principle, and can effectively eliminate the impact of the core saturation of a voltage transformer on a resonance elimination process, thereby greatly improving the success probability of single resonance elimination.
Disclosed is a converter having multiple DC ports. The converter comprises a multi-winding transformer, M unidirectional converter modules, and N bidirectional converter modules. The multi-winding transformer comprises a primary winding and M+N secondary windings. AC sides of the unidirectional converter modules and the bidirectional converter modules are correspondingly connected to the secondary windings on a one-to-one basis. DC sides of the N bidirectional converter modules form a cascade connection, and head and tail ends of said cascade connection form a low-voltage DC port. The low-voltage DC port further forms a cascade connection with DC sides of the M unidirectional converter modules, and head and tail ends of said cascade connection form a high-voltage DC port. The invention also proposes a corresponding control method. The converter having multiple DC ports in the present invention provides a plurality of DC ports, forms a DC bus, connects to a DC load and DC power supply, and has redundancy features, high reliability, and a good cost-performance ratio.
H02M 7/00 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continuTransformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif
H02M 7/06 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge sans électrode de commande ou des dispositifs à semi-conducteurs sans éléctrode de commande
H02M 7/72 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continuTransformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif avec possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande
H02M 3/158 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu sans transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs avec commande automatique de la tension ou du courant de sortie, p. ex. régulateurs à commutation comprenant plusieurs dispositifs à semi-conducteurs comme dispositifs de commande finale pour une charge unique
H02M 1/32 - Moyens pour protéger les convertisseurs autrement que par mise hors circuit automatique
H02J 3/38 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs
98.
FAULT ISOLATION AND FAULT RECOVERY METHOD AND SYSTEM FOR MEDIUM-VOLTAGE DIRECT CURRENT DISTRIBUTION NETWORK
Disclosed in the present invention are a fault isolation and fault recovery method and system for a medium-voltage direct current distribution network. A full-bridge converter is used in the medium-voltage direct current distribution network. A current limiting reactor is provided at a start end of the medium-voltage direct current distribution line; a load switch and a direct current protection device are provided at each segmented part of the line; a communication network is configured to implement communication among direct current protections. When a fault occurs to the medium-voltage direct current distribution network, the full-bridge converter limits the fault current to zero; after the fault current exceeds a set value, the direct current protection configured at the segmented part transmits the fault current and the fault current direction to an adjacent direct current protection, and determines a fault point according to the fault currents and the fault current directions of the direct current protection per se and the adjacent direct current protection; then the direct current protection which is the nearest around the fault point operates, the load switch is switched off to isolate the fault. After the fault is isolated, the direct current protection executing the fault isolation sends an instruction to the converter to recover power supply, and meanwhile sends an instruction to the direct current protection configured on an interconnection switch to switch on the switch, thereby recovering the power supply to a non-fault region.
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
A maritime wind power DC connection system, comprising a boost connection transformer (12), a bus (13), a voltage source converter (14), and auxiliary devices. The boost connection transformer (12) and the bus (13) are located on a maritime platform AC portion (15); the voltage source converter (14) is located on a maritime platform DC portion (16); and the maritime platform AC portion (15) is connected to the maritime platform DC portion (16) by means of bridges (17A, 17B). The present grid connected system can improve the stability and security of the access of a fan.
A fault switch configuration and clearing method in a flexible DC converter station, the flexible DC converter station is configured with a grid side switch and a valve side phase-split switch in the converter station. When a fault occurs, a faulty phase and a non-faulty phase are detected and identified by means of differential protection or low voltage overcurrent. An alternating current zero crossing condition is created by means of firstly turn off the non-faulty phase valve side phase-split switch and the grid side switch, thereby cutting off the faulty phase, disconnecting the connection between a power supply and a fault point, and achieving the clearing for faults. The described fault-clearing method is simple and practical, highly reliable, and connection between the fault point and the power supply is quickly and effectively cut; converter station equipment is effectively protected, and further expansion of the fault is avoided.
H02H 7/125 - Circuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour convertisseursCircuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour redresseurs pour convertisseurs ou redresseurs statiques pour redresseurs
H02H 7/26 - Protection sectionnelle de systèmes de câbles ou de lignes, p. ex. pour déconnecter une section dans laquelle un court-circuit, un défaut à la terre, ou une décharge d'arc se sont produits
H02J 3/36 - Dispositions pour le transfert de puissance électrique entre réseaux à courant alternatif par l'intermédiaire de haute tension à courant continu
H02M 7/06 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge sans électrode de commande ou des dispositifs à semi-conducteurs sans éléctrode de commande
brevets
