Abstract

The invention relates to the use of laser beams for measuring rotors, in particular wind turbines, for determining an imbalance or defining the absolute setting angle and/or measuring a half-profile of a rotor blade, and a method for determining a torsion of the rotor blade as a deviation between two pitch angles. In contrast to the solution in EP 2582970A1, the invention enables the determining of the absolute pitch angle of a rotor blade during operation, without it being necessary to obtain information relating to the rotor blade or reference points with a known position relative to the pitch axis, in particular using measuring devices that are mobile and/or positioned on the ground. It is also possible to contactlessly detect imbalances.

IPC Classes  ?

• F03D 17/00 - Monitoring or testing of wind motors, e.g. diagnostics
• F03D 13/35 - Balancing static or dynamic imbalances

Abstract

The invention relates to a measurement method and to a wind power plant having a corresponding measurement system for monitoring and/or optimizing wind power plants. Known measurement methods have the disadvantage of allowing only limited information about the state of a rotor blade or the operating state of a wind power plant. The aim of the invention is to disclose a measurement method allowing detailed information about the state of at least one rotor blade and thereby enabling optimization of the operating mode of the wind power plant or enabling early detection of material defects or material deviations. The aim is achieved by a measurement method or a wind power plant having a corresponding measurement system, wherein at least two profile lines are captured by means of a rotor blade.

IPC Classes  ?

• F03D 7/02 - Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor

Abstract

According to the invention said aim is achieved by means of a method for controlling a wind energy system comprising a tower, a nacelle horizontally rotatably disposed on the tower, and a horizontal rotor rotatably disposed on the nacelle, wherein the distance to the rotor blades passing through is measured at at least two different measurement points by means of at least two non-contacting distance sensors disposed fixedly on the nacelle and symmetrically to the rotor axis, the measurement axes thereof running symmetrically to the rotor axis, and the measured distance signals or a difference between the signals is used as the guide parameter for the controlled or regulated adjustment of actuating parameters of the wind energy system.

IPC Classes  ?

• F03D 7/02 - Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor

Abstract

The invention relates to a method for measuring deflection of a substantially elongated hollow component (B) of a wind energy system from a normal position, extended such that it can be used to determine the deflection of the hollow component (B) of a of a wind energy system from a normal position in a simple and accurate manner, and to reliably monitor the same. To this end, the invention proposes that at least one distance sensor (8.1) for measuring distance in a non-contacting, directed manner is disposed at a first position, taking distance measurements from a target point in the direction of a second position within the hollow component (B), and that a measurement target (9.1) is further disposed in the interior of the hollow component (B) at the second position, said target comprising a target surface extending in a direction (x) transverse to a reference plane (R) perpendicular to the measurement direction (10) of the distance sensor (8.1) in a measurement area, and that distance measurements to the target surface are taken continuously or at intervals by the distance sensor (8.1), wherein the results of the distance measurements are evaluated in a processing unit, and an associated deflection of the hollow component (B) from the normal position is determined from said measurements, each with regard to the directional component of the direction (x) in which the target surface extends transverse to the reference plane (R).

IPC Classes  ?

• G01B 5/28 - Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces

Abstract

b) is evaluated, said system emitting a collision warning in the event of a critical distance not being reached.

IPC Classes  ?

• H02P 9/04 - Control effected upon non-electric prime mover and dependent upon electric output value of the generator
• F03D 9/00 - Adaptations of wind motors for special useCombinations of wind motors with apparatus driven therebyWind motors specially adapted for installation in particular locations

Abstract

The invention relates to a method for measuring deflection of a substantially elongated hollow component (B) of a wind energy system from a normal position, extended such that it can be used to determine the deflection of the hollow component (B) of a of a wind energy system from a normal position in a simple and accurate manner, and to reliably monitor the same. To this end, the invention proposes that at least one distance sensor (8.1) for measuring distance in a non-contacting, directed manner is disposed at a first position, taking distance measurements from a target point in the direction of a second position within the hollow component (B), and that a measurement target (9.1) is further disposed in the interior of the hollow component (B) at the second position, said target comprising a target surface extending in a direction (x) transverse to a reference plane (R) perpendicular to the measurement direction (10) of the distance sensor (8.1) in a measurement area, and that distance measurements to the target surface are taken continuously or at intervals by the distance sensor (8.1), wherein the results of the distance measurements are evaluated in a processing unit, and an associated deflection of the hollow component (B) from the normal position is determined from said measurements, each with regard to the directional component of the direction (x) in which the target surface extends transverse to the reference plane (R).

IPC Classes  ?

• F03D 1/06 - Rotors
• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G02B 5/00 - Optical elements other than lenses
• G01S 17/08 - Systems determining position data of a target for measuring distance only
• G01C 3/06 - Use of electric means to obtain final indication
• G01B 17/04 - Measuring arrangements characterised by the use of infrasonic, sonic, or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
• G01M 5/00 - Investigating the elasticity of structures, e.g. deflection of bridges or aircraft wings