Judgment method of key sensor fault of double-fed wind generating set

A doubly-fed wind turbine and sensor failure technology, which is applied in the control of generators, motor generators, electromechanical brakes, etc., can solve problems such as unstable operation of the control system, affecting the reliability and safety of wind turbines, etc.

Inactive Publication Date: 2011-02-16
CHONGQING UNIV
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Problems solved by technology

Once the key sensors that affect the function of the control system fail, such as voltage and current sensors, it may directly lead to the unstable operation of the existing control system, and then directly affect t

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  • Judgment method of key sensor fault of double-fed wind generating set
  • Judgment method of key sensor fault of double-fed wind generating set
  • Judgment method of key sensor fault of double-fed wind generating set

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Embodiment 1

[0093] When the key sensor of the doubly-fed wind turbine is working normally, the sensor signal and the observer signal are both true values ​​(the true value of the measured signal). The sensor signal is compared with the observer signal to obtain the fault residual signal, and the fault residual signal at this time Near the zero value, it means that the sensor is working normally and there is no need to alarm the sensor failure, and the sensor signal is used in the control of the double-fed wind turbine. When a fault occurs in a simulated sensor, there will be an error between the sensor output signal and the measured real value, and the observer signal remains near the real value of the measured signal. At this time, the fault residual signal of the two is different. If it is zero again, the fault residual is compared with the different thresholds of the sensor’s soft and hard faults. It will be divided into the following three situations: if the fault residual is still less...

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Abstract

The invention provides a judgment method of a key sensor fault of a double-fed wind generating set, which realizes effective judgment of the key sensor fault by utilizing observer models, a fault detection unit and a disturbance filer unit. The judgment method comprises the following steps: constructing the observer model of stator current and rotor current and the observer model of stator voltage starting from an electromagnetic transient model of a double-fed generator; constructing the fault detection unit by an adaptive threshold method through analysis on the possible soft and hard fault types of the sensor; When the fault residual error is greater than an adaptive threshold value, constructing the disturbance filer unit by design of a timing unit; and finally completing design of the judgment models of the sensor fault based on the adaptive threshold value. The judgment method adopts an algorithm for constructing corresponding observers so as to improve the adaptability and the accuracy of the observer algorithm on fault judgment; and by combination of the adaptive threshold value and the disturbance filer unit, the false alarm rate of the sensor fault is reduced and the robustness of fault judgment is improved.

Description

Technical field [0001] The invention relates to a method for judging the failure of a key sensor of a doubly-fed wind turbine, and specifically includes a method for judging the failure of a stator voltage sensor and a stator and rotor current sensor, and belongs to the technical field of wind power generation. Background technique [0002] With the increasing of the single-unit capacity of grid-connected wind turbines in my country, and the planning, construction and operation of large-scale wind farms, especially offshore wind farms, how to improve and guarantee the operational reliability of wind turbines has become the domestic and international engineering community and academic The focus of attention of the world. The doubly-fed wind turbine is currently a mainstream model used in wind power generation. The stator three-phase winding of the doubly-fed generator is connected to the power frequency grid, and the rotor winding and the four-quadrant inverter with adjustable ampl...

Claims

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Application Information

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IPC IPC(8): H02P21/13
Inventor 李辉赵猛赵斌杨超陈宏文
Owner CHONGQING UNIV
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