Abrégé

Embodiments of the present application disclose an eddy current loss calculation method for a transformer, and a storage medium and a device. The method comprises: acquiring basic data of a target transformer, and building a single-phase three-dimensional magnetic field model of the target transformer according to the basic data; respectively calculating the average magnetic flux leakage intensity of each disc coil layer in a coil of the target transformer according to the single-phase three-dimensional magnetic field model; respectively constructing an eddy current loss weight function of each disc coil layer in the coil according to the average magnetic flux leakage intensity of each disc coil layer in the coil; and finally, respectively calculating eddy current loss of each disc coil layer in the coil according to a design calculation list of the target transformer and the eddy current loss weight function of each disc coil layer in the coil, such that the distribution of the eddy current loss of the target transformer in a space can be obtained, and the calculated eddy current loss of the transformer can be more accurate. The problem in the prior art that calculated eddy current loss is not accurate due to the influence on a coil temperature field cloud map under the rated capacity of a transformer by the conductivity of an iron core is solved.

Classes IPC  ?

• 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]

Abrégé

A DC voltage standard, which is used for calibrating a DC voltage transformer, and comprises: a signal conditioning module (10), having an input end connected to a DC power supply, and an output end connected to an input end of an AD conversion module (20); the AD conversion module (20), having an output end connected to an input end of a main control module (30); the main control module (30), having an output end connected to an input end of an optical fiber transceiver module (40); and the optical fiber transceiver module (40), having an output end connected to an external device. Signal ratios of received DC voltage signals are uniformly adjusted by means of the signal conditioning module (10), thereby avoiding the need to repeatedly replace DC voltage standards to adapt to DC voltage signals of different signal ratios, and reducing the complexity of the operation process, and the calibration of different DC voltage transformers can be achieved simply by one DC voltage standard.

Classes IPC  ?

• G01R 35/02 - Test ou étalonnage des appareils couverts par les autres groupes de la présente sous-classe des dispositifs auxiliaires, p.ex. des transformateurs pour appareils en fonction du rapport de transformation, de l'angle de phase ou de la puissance à l'utilisation
• G01R 19/00 - Dispositions pour procéder aux mesures de courant ou de tension ou pour en indiquer l'existence ou le signe

Abrégé

A digital-analog integrated voltage transformer calibration system, which is used for calibrating a voltage transformer. The system comprises: a direct-current high-voltage generator (10), an output end of which is connected to an input end of a signal conversion module (20); the signal conversion module (20), an input end of which is connected to an output end of a voltage transformer and an output end of which is connected to a digital quantity collection module (30); the digital quantity collection module (30), an input end of which is connected to the output end of the voltage transformer and an output end of which is connected to a processing module (40); the processing module (40), which is used for receiving a first digital voltage signal, a second digital voltage signal and a third digital voltage signal; and a synchronization module (50), an output end of which is connected to the digital quantity collection module (30) and the direct-current high-voltage generator (10). During the calibration of a voltage transformer, the digital-analog integrated voltage transformer calibration system can calibrate a voltage transformer which outputs an analog voltage signal or a first digital voltage signal, thereby simplifying the calibration process and reducing the cost of calibration.

Classes IPC  ?

• G01R 35/02 - Test ou étalonnage des appareils couverts par les autres groupes de la présente sous-classe des dispositifs auxiliaires, p.ex. des transformateurs pour appareils en fonction du rapport de transformation, de l'angle de phase ou de la puissance à l'utilisation

Abrégé

Disclosed in the embodiments of the present invention are an operation optimization method for an electrical integrated energy system, and a related device. The method comprises: acquiring basic operation parameters of an electrical integrated energy system, and constructing a dynamic model of the electrical integrated energy system, wherein the dynamic model comprises an electric power system model, a gas system model and a coupling element model, which comprises an electrical gas production device model and a gas turbine model; performing algebraic processing on the dynamic model, so as to obtain a target dynamic model; and under a preset boundary condition, determining target operation parameters for when the operation cost of the target dynamic model is the lowest, and implementing operation optimization of the electrical integrated energy system on the basis of the target operation parameters. Coupling elements in the electrical integrated energy system are modeled, which facilitates the description of detailed relationships between electric power and gas in the aspects of pressure, temperature, power distribution, etc., such that an operation control strategy for the electrical integrated energy system can be accurately formulated, thereby improving the economy and safety of the system.

Classes IPC  ?

• G06Q 10/06 - Ressources, gestion de tâches, des ressources humaines ou de projets; Planification d’entreprise ou d’organisation; Modélisation d’entreprise ou d’organisation
• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu

Abrégé

A self-energy-harvesting power monitoring device, relating to the technical field of power transmission lines of power systems. The self-energy-harvesting power monitoring device comprises an energy harvesting coil, a current sensing module and a processor. The energy harvesting coil is connected to the current sensing module. The current sensing module is connected to the processor. The current sensing module comprises magnetic field sensing modules. The magnetic field sensing modules are used for measuring a magnetic field environment, operation current and fault current around a power transmission line of a power system. The processor is used for processing magnetic field data and current data collected by the current sensing module. Self-power harvesting is achieved by means of the energy harvesting coil, then magnetic field data and current data around the power transmission line are obtained by means of the current sensing module, and finally electromagnetic environment characteristics and fault current conditions around the power transmission line are generated by the processor on the basis of the magnetic field data and the current data. Hence, the labor cost can be effectively reduced, and the workload of the operation and maintenance staff is reduced.

Classes IPC  ?

• G01R 31/08 - Localisation de défauts dans les câbles, les lignes de transmission ou les réseaux
• H02J 50/10 - Circuits ou systèmes pour l'alimentation ou la distribution sans fil d'énergie électrique utilisant un couplage inductif
• 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
• H02J 9/06 - Circuits pour alimentation de puissance de secours ou de réserve, p.ex. pour éclairage de secours dans lesquels le système de distribution est déconnecté de la source normale et connecté à une source de réserve avec commutation automatique

Abrégé

Provided in the embodiments of the present invention is a CT (current transformer)-based energy harvesting device, comprising a first shell and a second shell, which can be joined with each other to form an annular shape; a first iron core, which is arranged in the first shell, an energy harvesting coil being wound around the first iron core, and the first shell being provided with a wire outlet through which a pin of the energy harvesting coil extends out; and a second iron core, which is arranged in the second shell, wherein when the first shell is joined with the second shell, the first iron core and the second iron core are joined to form a closed annular structure, and an inflation assembly is provided on the first shell and/or the second shell, and comprises an inflation nozzle, an air sac and a sealing cap, the inflation nozzle being in communication with the air sac for inflating the air sac, and the sealing cap being configured to seal the inflation nozzle after inflation is completed. In the CT-based energy harvesting device, an air gap between the first iron core and the second iron core can be reduced, thereby improving the energy harvesting efficiency.

Classes IPC  ?

• H01F 27/02 - Enveloppes
• H01F 27/30 - Fixation ou serrage de bobines, d'enroulements ou de parties de ceux-ci entre eux; Fixation ou montage des bobines ou enroulements sur le noyau, dans l'enveloppe ou sur un autre support

Abrégé

Disclosed in the embodiments of the present application are a multi-energy system scheduling method, a computer device and a computer-readable storage medium. In the present application, a deterministic energy model for determined energy in a multi-energy system and a non-deterministic energy model for renewable resources therein can be respectively established according to the energy consumption and production characteristics of various resources, such that a two-stage robust scheduling model is finally established, and the two-stage robust scheduling model is finally solved by means of a preset algorithm, so as to finally determine a regulation and control decision. Therefore, flexible resources in a multi-energy system are rationally classified and represented, and solution is performed according to a preset algorithm to finally formulate a suitable multi-energy-system cooperative regulation and control method for various types of fixed resources and flexible resources, thereby fully exerting the flexibility of movable resources in the multi-energy system, and realizing cooperative regulation and control among multi-region multi-energy systems.

Classes IPC  ?

• G06Q 10/0631 - Planification, affectation, distribution ou ordonnancement de ressources d’entreprises ou d’organisations
• G06Q 50/06 - Fourniture d'électricité, de gaz ou d'eau

Abrégé

The present application provides an optimization method for a magnetic coupling coil. The method comprises: calculating an equivalent magnetic conductivity of a magnetic coupling coil according to an air gap length of the magnetic coupling coil; calculating an effective cross-sectional area of the magnetic coupling coil according to the equivalent magnetic conductivity and the power of the magnetic coupling coil; calculating the number of turns at the secondary end of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic conductivity; and optimizing the magnetic coupling coil according to the number of turns at the secondary end. According to the present application, an average magnetic path length and an effective cross-sectional area of the magnetic coupling coil are calculated according to the equivalent magnetic conductivity and the power of the magnetic coupling coil, and the number of turns at the secondary end of the magnetic coupling coil is calculated according to the effective cross-sectional area and the equivalent magnetic conductivity, so that parameters of the magnetic coupling coil can be reasonably configured, energy can be effectively harvested from a power grid to provide a stable power supply for a detection or communication device in the power grid, and the reliability of the magnetic coupling coil can be higher under the premise that the magnetic coupling coil meets the power demand.

Classes IPC  ?

• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu

Abrégé

Disclosed in the embodiments of the present invention are a method and system for calculating a winding temperature field under natural convection heat dissipation of a transformer. The method comprises: performing thermodynamic analysis on oil, winding and iron core parts of a target transformer, acquiring oil parameters, winding parameters and iron core parameters corresponding to the target transformer, and establishing a constraint equation according to a thermodynamic analysis result and the acquired parameters; determining a boundary condition according to the acquired parameters, and constructing a temperature model of the target transformer on the basis of the constraint equation and the boundary condition; acquiring a temperature value of any point in a space where the target transformer is located; and on the basis of the acquired temperature value, using the temperature model of the target transformer to solve and obtain a temperature field corresponding to the target transformer. By means of a temperature model provided in the present invention, the spatial distribution of winding temperatures under natural convection heat dissipation of a transformer can be acquired when only temperature measurement data of one point is acquired, thereby greatly improving the temperature calculation efficiency and the temperature monitoring efficiency of a transformer winding.

Classes IPC  ?

• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu
• G06F 30/28 - Optimisation, vérification ou simulation de l’objet conçu utilisant la dynamique des fluides, p.ex. les équations de Navier-Stokes ou la dynamique des fluides numérique [DFN]
• G06F 17/13 - Opérations mathématiques complexes pour la résolution d'équations d'équations différentielles

Abrégé

A power supply apparatus for a power transmission line monitoring device, said apparatus belonging to the technical field of power supply. The power supply apparatus comprises an energy acquisition module (1), a power transformation module, and a parameter adjustment module, wherein an energy acquisition end of the energy acquisition module is wrapped around a power transmission line, an output end thereof is connected to the power transformation module, and the energy acquisition module is used for acquiring electric energy from the power transmission line; an output end of the power transformation module is connected to the parameter adjustment module, and the power transformation module is used for converting obtained electric energy into electric energy matching a monitoring device; and an output end of the parameter adjustment module is connected to an input end of the monitoring device, and the parameter adjustment module is used for adjusting parameters of the obtained electric energy and transmitting the obtained electric energy to the monitoring device. The energy acquisition module is not prone to negatively affecting the normal operation of the power transmission line and can continuously obtain electric energy. The power supply stability is improved, such that the operation stability of the monitoring device is improved.

Classes IPC  ?

• 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

Abrégé

Disclosed in the present invention are an isolation switch temperature field simulation method and system capable of implementing fast convergence, and a simulation analysis terminal. The method comprises the following steps: establishing a multiphysics simulation coupling calculation model according to a geometric structure, material parameters and rated current of an isolation switch; receiving an inputted pre-calculation forced wind speed value, setting a pre-calculation boundary condition, and according to the pre-calculation forced wind speed value and the pre-calculation boundary condition, determining a pre-calculation flow field distribution value of the isolation switch on the basis of the simulation coupling calculation model; determining whether pre-calculation of the multiphysics simulation coupling calculation model satisfies a convergence condition; and using a flow field distribution value satisfying the convergence condition as an initial condition, uniformly setting an inlet boundary and an outlet boundary as an opening boundary, and calculating a temperature field of the isolation switch under a natural convection condition on the basis of the multiphysics simulation coupling calculation model. According to the simulation method and system capable of implementing fast convergence in the present invention, an initial value of a flow field is pre-calculated, such that fast convergence of temperature field calculation under a natural convection condition is achieved.

Classes IPC  ?

• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu

Abrégé

A multi-region integrated energy system scheduling method, a computer device, and a computer readable storage medium. According to the multi-region integrated energy system scheduling method, a first regulation and control model for cooperative regulation and control of a cross-region and inter-regional integrated energy system and a second regulation and control model for cooperative regulation and control of a regional and inter-park integrated energy system can be established in sequence, so that a third regulation and control model for cooperative regulation and control of a "cross-region-regional-park" three-level integrated energy system is finally established. The third regulation and control model is solved by means of a preset algorithm, so that decision information meeting multi-party benefit demands is finally obtained. According to the decision information, resource interaction can be performed by means of limited information among multiple levels and multiple main bodies, so that a resource allocation decision meeting diversified benefit demands is achieved while part of the privacy is protected.

Classes IPC  ?

• G06Q 10/06 - Ressources, gestion de tâches, des ressources humaines ou de projets; Planification d’entreprise ou d’organisation; Modélisation d’entreprise ou d’organisation

Abrégé

Disclosed in the embodiments of the present invention are a transformer iron core equivalent conductivity calculation method and a related device. The method comprises: acquiring basic data of a target transformer, the basic data comprising structural data of an iron core, a coil and a cabinet of the transformer, and coil turns, coil material parameters, oil material parameters and rated voltage of the transformer; constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, the three-dimensional magnetic field calculation model being a finite element modeling model; substituting an iron core equivalent conductivity of a preset transformer into the three-dimensional magnetic field calculation model to obtain an initial iron core magnetic flux density value; if the initial iron core magnetic flux density value meets a preset condition, using the iron core equivalent conductivity of the preset transformer as an iron core equivalent conductivity of the target transformer; and if the initial iron core magnetic flux density value does not meet the preset condition, adjusting the iron core equivalent conductivity of the preset transformer until the initial iron core magnetic flux density value meets the preset condition.

Classes IPC  ?

• 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]
• G06F 17/18 - Opérations mathématiques complexes pour l'évaluation de données statistiques

Abrégé

Provided in the present application are an oscillation wave generation circuit and a construction method. The circuit comprises: a high-voltage direct-current power source, an energy storage capacitor, a thyristor, an isolation pulse transformer, a pulse control network, an LC resonant loop and a low-voltage direct-current power source, wherein a positive electrode of the high-voltage direct-current power source is connected to a positive electrode of the energy storage capacitor, an anode of the thyristor and one end of an inductor element in the LC resonant loop; the other end of the inductor element in the LC resonant loop is connected to a positive electrode of a capacitor element in the LC resonant loop; a negative electrode of the capacitor element in the LC resonant loop, a cathode of the thyristor, a secondary reference end of the isolation pulse transformer and a negative electrode of the energy storage capacitor are each connected to a negative electrode of the high-voltage direct-current power source; a positive electrode of the low-voltage direct-current power source is connected to a primary input end of the isolation pulse transformer; a primary output end of the isolation pulse transformer is connected to a pulse output end of the pulse control network; and a negative electrode of the pulse control network is connected to a negative electrode of the low-voltage direct-current power source.

Classes IPC  ?

• H02J 50/12 - Circuits ou systèmes pour l'alimentation ou la distribution sans fil d'énergie électrique utilisant un couplage inductif du type couplage à résonance

Abrégé

The present application relates to a non-contact current and voltage composite measurement device and system, said device comprising a current signal detection apparatus, a voltage signal detection apparatus, a zero-crossing test circuit and a control unit. During implementation, when a current and a voltage flow through a power transmission line to be tested, the current signal detection apparatus generates a current induced electromotive force according to the current flowing through said power transmission line; and, when a current and a voltage flow through said power transmission line, the voltage signal detection apparatus generates a voltage induced electromotive force according to the voltage flowing through said power transmission line. The zero-crossing test circuit performs zero-crossing test on the current induced electromotive force and the voltage induced electromotive force, so as to determine the phase difference therebetween. After calibrating the phase difference, the control unit can simultaneously output the current value, the voltage value and the power value of said power transmission line. The technical solution of the present application can simultaneously output the current value, the voltage value and the power value of power transmission lines to be tested, thereby better satisfying the demand on load measurement of power transmission lines.

Classes IPC  ?

• G01R 19/00 - Dispositions pour procéder aux mesures de courant ou de tension ou pour en indiquer l'existence ou le signe
• G01R 21/00 - Dispositions pour procéder aux mesures de la puissance ou du facteur de puissance

Abrégé

Disclosed is an electrical device hanging apparatus, comprising a mounting member (10), two holding members (20), and a lifting/lowering assembly (30). The mounting member (10) has two opposite ends, and the two holding members (20) are rotatably arranged on the two ends of the mounting member (10), respectively; one end of the lifting/lowering assembly (30) is arranged on the mounting member (10), and the other end of the lifting/lowering assembly (30) is rotatably connected to the two holding members (20); the lifting/lowering assembly (30) can move back and forth with respect to the mounting member (10), so as to drive the two holding members (20) to be tightened or loosened. In the apparatus, by operating the lifting/lowering assembly to move back and forth with respect to the mounting member, the two holding members can be tightened or loosened, when the two holding members are tightened, a data acquisition device can be hung on an electric wire in the air, and when the two holding members are loosened, the data acquisition device can be taken down from the electric wire in the air; thus, the apparatus is time-saving and labor-saving.

Classes IPC  ?

• F16M 13/02 - Autres supports ou appuis pour positionner les appareils ou les objets; Moyens pour maintenir en position les appareils ou objets tenus à la main pour être portés par un autre objet ou lui être fixé, p.ex. à un arbre, une grille, un châssis de fenêtre, une bicyclette

Abrégé

The present application relates to a method for electromagnetic transient simulation of a transformer. The method comprises: building a transformer model on the basis of a finite-difference time-domain method, and setting the time step of the transformer model; acquiring a frequency response curve of the transformer; updating an electric field component and a magnetic field component of the transformer model on the basis of the frequency response curve to obtain an electric field component of the current time step and a magnetic field component of the current time step; and if the electric field component of the current time step or the magnetic field component of the current time step converges, ending the simulation. According to the present application, the transformer model is established on the basis of the finite-difference time-domain method, without the need of complex and tedious calculation and on-site tests, so that the calculation efficiency can be greatly improved. In addition, the electric field component and the magnetic field component of the transformer model are updated on the basis of the frequency response curve. In this way, electromagnetic response parameters of a frequency-dependent transformer can be taken into full consideration in the time domain, thereby greatly improving simulation precision.

Classes IPC  ?

• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu

Abrégé

A security zone construction method for an electro-thermal integrated energy system, relating to the fields of energy system modeling and operation analysis. The method specifically comprises: establishing an electro-thermal integrated energy system dynamic model, wherein the electro-thermal integrated energy system dynamic model comprises an electric power system model, a quality adjustment thermal system dynamic model, and a combined heat and power unit dynamic model; according to operation security constraints, establishing an electro-thermal integrated energy system security zone model related to heat dynamics; and for non-linear and non-convex characteristics of a security zone of the electro-thermal integrated energy system, solving the boundary of the security zone by using a convex hull method based on optimization and verification, and delineating the security zone. The operation characteristics of the electro-thermal integrated energy system are accurately delineated by comprehensively considering the heat dynamics of device and network sides in the electro-thermal integrated energy system. A limit operation point is solved by means of a convex hull method based on optimization and verification, so that the absolute security of the security zone obtained by solving is guaranteed, thereby providing theoretical guidance for operation analysis of the electro-thermal integrated energy system.

Classes IPC  ?

• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu

Abrégé

Disclosed in embodiments of the present application are a method for preventing an operator from falling, a controller, a safety belt, and a computer-readable storage medium. The method for preventing an operator from falling comprises the following steps: acquiring magnetic field information of a belt body of a safety belt worn by an operator; querying a preset fastening state mapping table according to the magnetic field information to obtain a fastening state of the safety belt, wherein the fastening state mapping table is used for storing a mapping relationship between magnetic field information and each fastening state; and outputting a warning signal according to the fastening state. Therefore, in the present application, fastening state information of a safety belt can be matched and determined by means of magnetic field information of the safety belt, without changing the mechanical structure and safety performance of the existing safety belt, and early warning can be carried out in time when the safety belt is in an unfastened state, thereby improving the operation safety of the operator.

Classes IPC  ?

• A62B 35/00 - Ceintures ou harnais de sécurité; Equipements similaires pour limiter le déplacement du corps humain, notamment en cas de changement brusque de mouvement
• G08B 21/02 - Alarmes pour assurer la sécurité des personnes

Abrégé

tG1G2GnG1G2GnGn are the power generated by each adjustment power source for compensating for the three-phase current unbalance of a transformer area; the split-phase power adjustment modules are connected to lines of three phases, i.e. A, B and C, and a neutral line N; and the sub-controllers are connected to the adjustment power sources, and the sub-controllers communicate with the main controller, so as to control the power generated by each adjustment power source for compensating for the three-phase current unbalance of the transformer area. A plurality of distributed power sources collaboratively perform adjustment, such that the accurate governance of three-phase unbalance of a transformer area is realized, thereby reducing the line loss, and improving the electric energy quality.

Classes IPC  ?

• H02J 3/26 - Dispositions pour l'élimination ou la réduction des asymétries dans les réseaux polyphasés
• H02J 3/46 - 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
• H02J 3/38 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs

Abrégé

Disclosed in embodiments of the present invention are an unbalanced current regulation system and method for capacity increasing and split-phase output of a distribution transformer. The unbalanced current regulation system for capacity increasing and split-phase output of a distribution transformer is provided with a single-phase transformer, a single-phase bridge rectifier, and a three-phase full-bridge inverter; a high-voltage side of the single-phase transformer is connected to a high-voltage side of the distribution transformer; the single-phase bridge rectifier connected to a low-voltage side of the single-phase transformer converts alternating current from the single-phase transformer into direct current and supplies the direct current to the three-phase full-bridge inverter; and the three-phase full-bridge inverter is connected to a three-phase line by means of a three-phase reactor. A three-phase negative-sequence current and a three-phase zero-sequence current are obtained by performing sequence component decomposition processing on a three-phase load current, then a three-phase reference current is calculated on the basis of a capacitor voltage control component, and then hysteresis control is performed on the three-phase reference current, such that the three-phase full-bridge inverter outputs a corresponding three-phase compensation current to each phase of the three-phase line, thereby achieving three-phase unbalanced current regulation.

Classes IPC  ?

• H02J 3/26 - Dispositions pour l'élimination ou la réduction des asymétries dans les réseaux polyphasés
• 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

Abrégé

Disclosed are an inverter individual-phase control and distribution transformer current unbalance adjustment system and method. The inverter individual-phase control and distribution transformer current unbalance adjustment system comprises a distributed power supply and a three-phase full-bridge inverter, the three-phase full-bridge inverter being connected to the distributed power supply, and the three-phase full-bridge inverter being connected to three phase lines by means of a three-phase reactor. When the unbalance degree corresponding to the three phase lines is greater than a preset starting value, three-phase compensation current reference values are obtained according to current three-phase front-end load currents, three-phase back-end load currents and capacitor voltage control components, so that the three-phase full-bridge inverter outputs three-phase compensation currents on the basis of the three-phase compensation current reference values. Therefore, the three-phase full-bridge inverter can output the compensation currents required by the phases of the three phase lines by using the output powers of the distributed power supply, so as to achieve distribution transformer three-phase current unbalance adjustment and control, so that the three-phase currents of a distribution transformer are balanced.

Classes IPC  ?

• H02J 3/26 - Dispositions pour l'élimination ou la réduction des asymétries dans les réseaux polyphasés
• 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

Abrégé

Disclosed in embodiments of the present invention are a line protection method for a flexible grounding system of a power distribution network, and a related device. The method comprises: under the condition that a grounding fault occurs in a target power distribution network, a voltage source of a flexible grounding apparatus of each line of the target power distribution network outputs a first compensation voltage; a zero-sequence impedance protection apparatus starts to calculate zero-sequence impedance of each line in real time; after the first compensation voltage is output for a first output duration, the voltage source of the flexible grounding apparatus adjusts an output voltage to output a second compensation voltage; the line zero-sequence impedance protection apparatus calculates the zero-sequence impedance of each line in real time; and the zero-sequence impedance protection apparatus determines, according to the zero-sequence impedance, a fault line satisfying a zero-sequence impedance protection condition and a zero-sequence voltage protection condition, and cuts off the fault line after a preset tripping delay so as to isolate a grounding fault.

Classes IPC  ?

• H02H 9/08 - Limitation ou suppression des courants de défaut à la terre, p.ex. bobine Petersen
• H02H 7/28 - 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 pour réseaux maillés

Abrégé

An annular power network fault location method and a location apparatus. The location method comprises: in an annular power network, performing expansion in each annular path segment using any point as the origin to construct a plurality of reference coordinate systems (S110); acquiring monitoring point coordinate information and a wave head arrival time of each monitoring point site in each reference coordinate system (S120); acquiring hypothetical fault point information (S130); acquiring a traveling wave propagation speed (S140); constructing a plurality of distributed fault location equation sets according to the hypothetical fault point information, the traveling wave propagation speed, the wave head arrival time information, and the monitoring point coordinate information in each reference coordinate system (S150); and determining an actual fault location according to a solution of each distributed fault location equation set and a fault hypothetical sector (S160). The annular power network fault location method and the location apparatus are reliable, economical, and accurate.

Classes IPC  ?

• G01R 31/08 - Localisation de défauts dans les câbles, les lignes de transmission ou les réseaux

Abrégé

Disclosed in the present invention is an incomplete dimension raising-based method for optimization calculation of a data-driven power system. A power flow independent variable is further divided into a control variable and a disturbance variable, wherein the control variable is used as an optimization variable in an optimization problem, and an output active power and an output reactive power of a controllable device, such as a controllable power source, and operation states, etc. of other controlled devices in a power grid can be selected; and the disturbance variable is an uncontrolled independent variable, for example, a voltage amplitude of a slack bus, an inject active and reactive power of a bus, and an inject active power and a voltage amplitude of a PV bus. In the present invention, dimension raising is performed only on a disturbance variable, and a nonlinear function in a dimension raising function adapts to a nonlinear characteristic of a power flow; and dimension raising is not performed on a control variable, such that a power flow constraint remains as a linear expression regarding the control variable, the form of the power flow constraint is simplified and the solution is simplified, and the optimization effect having higher precision can also be achieved. By using the optimization calculation method of the present invention, the power optimization scheduling of distributed photovoltaics can be realized.

Classes IPC  ?

• H02J 3/06 - Commande du transfert de puissance entre réseaux connectés; Commande du partage de charge entre réseaux connectés
• H02J 3/38 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs
• H02J 3/46 - 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
• G06F 17/16 - Calcul de matrice ou de vecteur
• G06Q 10/04 - Prévision ou optimisation spécialement adaptées à des fins administratives ou de gestion, p. ex. programmation linéaire ou "problème d’optimisation des stocks"
• G06Q 50/06 - Fourniture d'électricité, de gaz ou d'eau

Abrégé

An equipment model selection method for an energy interconnection system, which considers equipment investment costs and equipment operation self-contained constraints by means of an upper-layer planning model, and considers operation benefits of integrated energy system planning equipment and energy supply reliability effect and carbon emission of the integrated energy system by means of a lower-layer planning model. An overall planning scheme of the integrated energy system is outputted by means of linkage of the upper-layer planning model and the lower-layer planning model. The carbon dioxide emission reduction effect is considered in a planning process, and the low-carbon target can be better achieved. The reliability costs are considered in the planning process, and are calculated by means of the cut-off load capacity and a unit cut-off load penalty factor, and after the reliability costs are set, the energy supply scheme of the integrated energy system obtained by planning has better energy supply reliability.

Classes IPC  ?

• H02J 3/00 - Circuits pour réseaux principaux ou de distribution, à courant alternatif
• 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
• G06Q 10/06 - Ressources, gestion de tâches, des ressources humaines ou de projets; Planification d’entreprise ou d’organisation; Modélisation d’entreprise ou d’organisation
• G06Q 50/06 - Fourniture d'électricité, de gaz ou d'eau

Abrégé

The present application relates to the field of comprehensive energy system applications and provides a high-temperature steam heat pump dynamic modeling method and system. The method comprises: determining components of a high-temperature steam heat pump system; selecting a refrigerant; in combination with the requirements of the actual industry for a steam temperature and system energy consumption, determining initial parameters of the high-temperature steam heat pump system, as an initial state for system dynamic modeling; establishing a lumped parameter model for an evaporator, a first condenser, a second condenser, and a flash tank by using a moving boundary method and a lumped parameter method; establishing a steady-state model for a scroll compressor, a screw compressor, a first thermostatic expansion valve and a second thermostatic expansion valve by using an empirical formula; and developing a simulation module corresponding to a mathematical model on a simulation platform, and performing simulation. According to the high-temperature steam heat pump dynamic modeling method and system, the steady-state performance of the system is analyzed more accurately, and the high-temperature steam heat pump system is optimized and controlled better.

Classes IPC  ?

• G06F 119/08 - Analyse thermique ou optimisation thermique

Abrégé

A preparation method for a gradient insulating component, comprising: using topology optimization method to calculate a common spatial optimization target for electrical conductivity and dielectric constant inside of the structure of the gradient insulating component structure; separately calculate an optimal electrical conductivity distribution and an optimal dielectric constant distribution; obtaining a high dielectric region the electrical conductivity of which is high and the dielectric constant of which is high, and calculating a uniform dielectric constant value and a uniform electrical conductivity value of the high dielectric region; and determining, according to the uniform dielectric constant value and the uniform electrical conductivity value, the amount of filler added to the preparation material in the high dielectric region to complete the preparation of the high dielectric part, and completing the preparation of a remaining low insulation region of the insulating component by using a vacuum casting means. The method may quickly optimize a gradient insulating structure for suppressing local electric field distortion, and can adapt to working occasions under different voltages, so that the precise control of the preparation of a gradient insulating component may be achieved, and the insulation effect of the fabricated gradient insulating component is better.

Classes IPC  ?

• H01B 19/00 - Appareils ou procédés spécialement adaptés à la fabrication d'isolateurs ou de corps isolants

Abrégé

A method and apparatus for remote transmission of an analog quantity. An acquisition module acquires an analog quantity used for inspecting power system secondary equipment; a time-domain waveform and a frequency-domain waveform of the analog quantity are discretized to extract characteristic values, such as an amplitude and a phase angle, of the analog quantity; then a communication transmission module modulates an electromagnetic wave as a carrier wave; the characteristic values such as the amplitude and phase angle are transmitted to a receiving end of an analog quantity fitting module at each production site by means of an operator network; thus, the analog quantity transmission speed and accuracy are improved. Finally, the receiving end arranged at each production site fits the demodulated characteristic values such as the amplitude and phase angle into an analog quantity, and transmits the analog quantity to power system secondary equipment to be inspected, so as to perform remote inspection on the power system secondary equipment.

Classes IPC  ?

• G01R 31/00 - Dispositions pour tester les propriétés électriques; Dispositions pour la localisation des pannes électriques; Dispositions pour tests électriques caractérisées par ce qui est testé, non prévues ailleurs

Abrégé

Provided in the present application is a wireless-communication-based hardware-in-the-loop simulation system for a security and stability control apparatus, which system uses wireless communication technology to achieve standardized hardware-in-the-loop simulation of the security and stability control apparatus. The simulation system provided in the present application comprises a real-time digital simulation apparatus, a real-time simulation data concentrator, a wireless communication device, a test terminal device and a tested security and stability control apparatus. The simulation system supports the simultaneous simulation testing of security and stability control apparatuses of 12 plant stations. The wireless communication device is used to establish a wireless network, and the real-time digital simulation apparatus performs information interaction with the tested security and stability control apparatus by means of the real-time simulation data concentrator, the test terminal device and the wireless network, without the need to use a large number of peripheral board cards and communication cables, thereby simplifying the design and construction of the simulation system, and improving the efficiency and quality of simulation.

Classes IPC  ?

• G01R 31/00 - Dispositions pour tester les propriétés électriques; Dispositions pour la localisation des pannes électriques; Dispositions pour tests électriques caractérisées par ce qui est testé, non prévues ailleurs

Abrégé

The present invention relates to the technical field of optimal energy of an electrical interconnection integrated energy system, and disclosed is a sequential convex programming-based optimal energy flow calculation method for an electrical interconnection system. The present invention comprises: before constructing a convex relaxation of a quadratic constraint of an optimal energy flow model, constructing a convex optimization part of the optimal energy flow model in an electrical interconnection integrated energy system according to the fuel cost of each fire point unit node and the gas supply cost of a natural gas source node, constructing the convex relaxation of the quadratic constraint of the optimal energy flow model in the electrical interconnection integrated energy system, and performing first-order Taylor expansion on a convex function at a relaxation solution to form an expansion; giving an accuracy requirement threshold of a nonconvex constraint, comparing the threshold with the size of the imbalance of the nonconvex constraint in the expansion; if the imbalance is greater than the threshold, then iterating the expansion into a solution model of the electrical interconnection integrated energy system until the imbalance is not greater than the threshold, so as to obtain the relaxation solution in the model.

Classes IPC  ?

• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu
• G06F 111/04 - CAO basée sur les contraintes

Abrégé

A rapid current amplification system and method based on a power amplifier. The system comprises a main power module, a main control module, and rapid current amplification modules. The main power module is connected to the main control module. Several rapid current amplification modules are connected in parallel and connected to the main power module. Each group of rapid current amplification modules comprises two signal analysis processing modules and a load. The two signal analysis processing modules are connected in parallel. The input ends of the signal analysis processing modules are connected to the main power module, and the output ends are connected to the load. The operating state of the load is determined, and the switching frequency of the current is changed, so that the current output of the current amplifier is maintained at a peak value. The system has the advantages of improving the power factor by changing the current amplification mode, i.e., amplifying fundamental current by means of a power amplifier. Using multiple 5-10 KW power modules connected in parallel as the main power module improves the stability of the power supply. In addition, a low-power power supply has a relatively high switching frequency, thereby providing a sufficient inductive load on the current transformer.

Classes IPC  ?

• G01R 35/02 - Test ou étalonnage des appareils couverts par les autres groupes de la présente sous-classe des dispositifs auxiliaires, p.ex. des transformateurs pour appareils en fonction du rapport de transformation, de l'angle de phase ou de la puissance à l'utilisation

Abrégé

iiiii, and a bias factor η of a second high-frequency current transformer (11), and performing an assessment of an aging state of the XLPE cable (16) by calculating a leakage current difference factor λ. In this way, the invention improves the reliability of cables in supplying power, and has advantages of operational simplicity for data acquisition, easy-to-follow steps for field installation and connection, and accuracy and reliability of calculation processes, thereby achieving fast testing and assessment of a leakage current difference factor λ of aged XLPE cables (16), and realizing accurate and efficient assessment of the insulation performance of XLPE cables (16).

Classes IPC  ?

• G01R 31/12 - Test de la rigidité diélectrique ou de la tension disruptive
• G01R 31/00 - Dispositions pour tester les propriétés électriques; Dispositions pour la localisation des pannes électriques; Dispositions pour tests électriques caractérisées par ce qui est testé, non prévues ailleurs

Abrégé

A ground fault current compensation system, method and apparatus for a self-produced power-supply-phase power source. The system comprises a phase power supply generator (1), a phase power supply phase compensator (2), a fling-cut switch (3), a controller (4), and a voltage transformation device (5). An output end of the phase power supply phase compensator (2) is connected to a system neutral point by means of the fling-cut switch (3). The system can passively generate power distribution network phase power supply and harmonic phase power supply and input an inverse phase power supply and a harmonic phase power supply into the system according to fault logic. The complete compensation of reactive current, harmonic current and active current for the ground fault of the power distribution network is achieved, the defect that compensation is incomplete by adopting an inversion injection method of a power electronic device after electricity is taken from a bus system is overcome, and the problems that an active inversion method has a poor metallic grounding compensation effect and a conventional arc suppression coil cannot achieve full compensation are solved. The system is efficient and accurate and can completely compensate overvoltage and overcurrent generated by a ground fault, the safety of a power grid and equipment is guaranteed, and the risk of electric shock of a human body is completely avoided.

Classes IPC  ?

• H02J 3/18 - Dispositions pour réglage, élimination ou compensation de puissance réactive dans les réseaux
• 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