Control method for drift correction of variable pitch actuating mechanism of wind generating set

Abstract

The invention provides a control method for drift correction of a variable-pitch actuating mechanism of a wind generating set. The method comprises the following steps: calculating an estimated variable-pitch position through a preset virtual variable-pitch actuating mechanism model, comparing the estimated variable-pitch position with an actually detected variable-pitch position, calculating a correction value, and determining a final variable-pitch control instruction. According to the method, the pre-estimated variable pitch position is adopted, so as to solve the problem that in a traditional mode, only variable pitch control instructions are considered, the dynamic response of a variable pitch execution mechanism is not fully included, and the problem that the real-time correction value of a three-blade variable pitch mechanism is not accurate enough. According to the method, the mode of a preset virtual variable-pitch execution mechanism is introduced into correction logic, the initial variable-pitch rate instruction is corrected more accurately, real-time response of the variable-pitch execution mechanism of the three blades to the wind speed is guaranteed, and the problem of pneumatic imbalance of the impeller caused by asynchronous variable-pitch is avoided.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a control method for drift correction of a pitch actuator of a wind power generating set. Background technique [0002] Wind turbines have different power control strategies under different wind speeds. After reaching the rated wind speed, the goal is to control the generator speed at the set point through pitch control. Pitch control generally takes the difference between the actual speed and the speed set point as the control input, uses the control algorithm to calculate the corresponding pitch position or pitch rate command, and transmits it to the pitch actuator for pitch operation, by changing The pitch angle position of the three blades controls the wind energy absorption to maintain the generator speed at the rated speed. Since the pitch actuator generally adopts electric or hydraulic pitch, there is a certain delay in the response of the motor or hydraulic device fr...

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Problems solved by technology

[0004] In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a control method for the drift correction of the pitch actuator of the wind power generating set, which replaces the existing solution that only considers the difference between the pitch control command and the execution situation, thereby avoiding the The problem caused by the deviation of the correction value caused by the dynamic response of the pitch actuator is not considered

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