中文摘要：

在分析电动变桨距系统工作原理的基础上，桨叶位置由主控制器根据风速变化计算出的桨距角变化量来调节，建立了三闭环直流电动变桨执行机构的数学模型。通过Matlab／Simulink对风力机功率控制进行仿真实验。介绍了仿真结果。

英文摘要：

Based on the working principle analysis of electric pitch control system, the blade position is adjusted by the pitch angle change which is calculated by the main controller according to the variation of wind speed, and the mathematical model for electric pitch control system is established. Finally, the power control simulation of wind tur- bine is completed through Matlab/Simulink. As shown by the simulation results, the position loop controller type, proportional coefficient of P controller, transmission ratio of speed reducers have different but greater influence on the output power of wind turbine under different wind speed signal. This research provides the theoretical basis for further optimization design of wind turbine and advanced control strategy adoption for power control.