Sleep control method for exchange variable pitch control system

Abstract

The invention discloses a sleep control method for an exchange variable pitch control system. The method comprises the steps that in the normal electricity generating state of a wind electricity generating set, the variable pitch control system drives blades to reach the optimum blade pitch angle positions, when | a blade actual position-the optimum blade pitch angle | is less than or equal to 0.1degree error, after some time is delayed, a main control controls the variable pitch control system to enter a sleep mode, a variable blade driver stops outputting, and a variable blade motor brake conducts band-type brake to make the blades reach the optimum blade pitch angle positions. When the variable blade driver breaks down or | a preset main control blade pitch angle-the optimum blade pitch angle | is greater than 0.1 degree, the main control controls the variable blade driver to quit the sleep mode, the variable blade driver begins outputting, and the variable blade motor brake conducts brake releasing. According to the method, the exchange control variable blade system can enter and quit the sleep mode, the work time of the variable blade driver and a variable blade motor is shortened, the temperature rising of the system can be effectively reduced, the using life of a super-capacitor is prolonged, the self-power-consumption of the variable blade control system is reduced, and the wind electricity generating set can be more energy-saving and more environmentally friendly.

Description

technical field [0001] The invention belongs to the field of control of wind power generating sets, and in particular relates to a dormancy control method of an AC pitch control system. Background technique [0002] The control strategy of the AC pitch control system in the normal power generation process of early wind turbines is: when the blade reaches the optimal pitch angle of 0°, the pitch control system outputs the braking torque by controlling the pitch motor to make the blade position Maintain the optimal pitch angle position. During the whole process, the pitch driver MPC outputs current, and the pitch motor is in working state, so the overall temperature rise of the AC pitch control system is relatively high. However, at present, most of the backup power supply configuration of the AC pitch control system is a super capacitor. There are several points for attention during the use of the super capacitor, including confirming the polarity before use, using it under ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the large overall temperature rise of the existing AC pitch control system, which is not conducive to prolonging the service life of the super capacitor, in order to reduce the overall temperature rise of the AC pitch control system, it is necessary to change when the blade reaches the optimal pitch angle. The control strategy of the AC pitch control system after 0°, the present invention provides a dormant control method of the AC pitch control system, by upgrading the main control program, the pitch control system enters into , Exit the sleep mode, so as to control the current output of the pitch driver MPC and the action of the pitch motor brake, reduce the working time of the pitch driver and the pitch motor, effectively reduce the overall temperature rise of the pitch control system, and improve the service life of the super capacitor

Images