Method for diagnosing imbalance faults of blades

A technology of balancing faults and diagnostic methods, applied in the direction of static/dynamic balancing testing, measuring devices, instruments, etc., can solve problems such as reduced reliability, unbalanced blades, increased costs, etc., to achieve improved effectiveness and low diagnostic costs Effect

Active Publication Date: 2013-08-07
SOUTHEAST UNIV
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Problems solved by technology

[0003] At present, for the diagnosis of blade unbalance faults, relatively mature technology is based on vibration and FFT (Fast Fourier Transform, Fast Fourier Transform) analysis method, but this method has certain shortcomings
On the one hand, it is necessary to install vibration sensors on t

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  • Method for diagnosing imbalance faults of blades
  • Method for diagnosing imbalance faults of blades

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Embodiment Construction

[0061] The present invention will be further described below in conjunction with the accompanying drawings.

[0062] A method for diagnosing blade imbalance faults, comprising the steps of:

[0063] (1) Record the current component i of the quadrature axis of the generator under the operating condition of the wind turbine q signal and generator speed signal;

[0064] (2) Using the VKF-OT method from the current component i of the quadrature axis of the motor q Extract the characteristic order ratio component from

[0065] (3) Calculate the envelope spectrum of the magnitude of the characteristic order ratio component;

[0066] (4) Diagnose whether there is a blade unbalance fault in the wind turbine through the change of the envelope spectrum.

[0067] The following takes the direct drive permanent magnet synchronous wind turbine as an example to illustrate this case:

[0068] The unbalanced fault of the blades of the wind turbine will cause the shaft torque output by the...

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Abstract

The invention discloses a method for diagnosing imbalance faults of blades. The method includes steps of (1), recording signals of current components i<q> of a quadrature axis of a generator and rotational speed signals of the generator when a wind generation set is in a running state; (2), extracting feature order components from the current components i<q> of the quadrature axis of the generator by a VKF-OT (Vold-Kalman filter order tracking) process; (3), computing an envelope spectrum of amplitudes of the feature order components; and (4), diagnosing the wind generation set according to a change condition of the envelope spectrum to determine whether the imbalance faults of the blades occur or not. The method for diagnosing the imbalance faults of the blades has the advantages that the imbalance faults of the blades of the wind generation set can be diagnosed in real time by the VKF-OT process; extra sensors or data acquisition equipment are omitted in a fault diagnosing procedure, the method is simple and feasible, and the diagnosing cost is low; non-stationary signals can be effectively processed by the VKF-OT process, so that shortcomings of the traditional signal processing technology can be overcome; and the diagnostic effectiveness, the diagnostic reliability and the diagnostic instantaneity are improved.

Description

technical field [0001] The invention relates to a fault diagnosis method for unbalanced blades, which belongs to wind power generation technology. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, wind power generation has received more and more attention. All over the world, a large number of wind turbines have been put into production, which has drawn people's attention to the safe and stable operation of wind turbines. During the year-round operation of wind turbines, due to the influence of aerodynamic forces and harsh environments, wind turbines are prone to various faults. The status monitoring and fault diagnosis of wind turbines have become an indispensable link. Among them, blade imbalance fault diagnosis occurs The odds are very high. Unbalanced blades will cause huge vibration of the wind turbine, which will affect the life of the wind turbine. Wind turbine blades are expensive and difficult to maintain after...

Claims

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Application Information

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IPC IPC(8): G01M1/14
Inventor 张建忠杭俊程明
Owner SOUTHEAST UNIV
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