Optimal control of constant ratio of voltage to frequency for variable pitch drive motor lowfrequency output

FAN Hongwei, YU Qingqing, XV Guodong

(State Key Laboratory of Wind Power System, Zhejiang Windey Co., Ltd., Hangzhou 310012, China)

Abstract: Aiming at the problem of blades were difficult to install in lifting site, control technology and pitch drive motor were researched, a wind turbine hub pitch control system for the blades installing was proposed, the control technology of constant ratio of voltage to frequency for lowfrequency output was investigated, the control mode and control variables were optimized. The operation of 2.0MW wind turbine variable pitch control system was simulated based on Matlab/Simulink, meanwhile, these control variables and control parameters of the model were tested. The results indicate that the optimal mode and reasonable compensation value of the torque control compensation, intermediate voltage and intermediate frequency is not only satisfied the actual conditions to ensure the safety of pitch drive motor but also can play the best output characteristics, so that the blades hub site installation convenient, economical and efficient.

Key words: variable pitch drive motor; constant ratio of voltage to frequency; output torque; simulation