Method and device for detecting abnormity of variable pitch control loop of wind generating set

Abstract

The invention provides a method and a device for detecting the abnormity of a variable pitch control loop of a wind generating set. The detection method comprises the following steps of acquiring sampling values of pitch angles of the wind generating set at a plurality of sampling moments within a preset time period; determining predicted values of the pitch angles at the plurality of sampling moments according to a prediction function; analyzing the deviation condition of the sampling value of the pitch angle relative to a predicted value of the pitch angle; if determining that the sampling value of the pitch angle deviates from the predicted value of the pitch angle, judging whether the change of the sampling value of the pitch angle meets abnormal characteristics or not; and outputting a detection result for the variable pitch control loop according to a judgment result of the abnormal characteristics. By the adoption of the method and the device for detecting the abnormity of the variable pitch control loop of the wind generating set provided by the embodiment of the invention, the abnormal state of the variable pitch control loop of the wind generating set can be effectively recognized, the abnormal state can be processed in time, and the stability of the wind generating set can be guaranteed.

Description

technical field [0001] The present invention generally relates to the technical field of wind power generation, and more specifically relates to a method and device for detecting abnormality of a pitch control loop of a wind power generating set. Background technique [0002] The pitch system of the wind turbine can stabilize the speed and power output by adjusting the pitch angle, or perform pneumatic braking to stop. The principle of the pitch control loop is: the anemometer installed on the nacelle measures the wind speed, and transmits the wind speed information to the control cabinet at the bottom of the tower, determines the pitch information after analyzing the wind speed information, and transmits the pitch information to the hub pitch system. The center box, the center box transmits the pitch information to the 3 axle boxes, and the 3 axle boxes adjust the pitch angle of the blades through the pitch drive. [0003] The normal operation of the pitch control loop of ...

AI Technical Summary

Problems solved by technology

The difficulty of detecting this abnormal mode is that it generally does not cause obvious abnormal stability of the whole machine and reports a fault to realize protection.

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