针对风机变桨距系统对位置跟随性能和抗扰性要求高的特点，本文对永磁同步电机电动变桨距伺服系统的二自由度内模控制进行了研究。在分析电动变桨距系统控制原理的基础上，设计了一个二自由度内模控制器，实现电动变桨距伺服控制系统的位置跟踪和抗扰性的双优控制，并有效抑制了转矩脉动。仿真结果表明，所设计的控制器较传统的PID控制具有更好的控制效果。

Aiming at the high-performance requirements of electric pitch system of megawatt wind turbine for the position tracking and load disturbance regulation characteristics, a two-degree-of-freedom internal model control (2DOF-IMC) is proposed for electric pitch Servo control system, in which a permanent magnetism synchronous motor (PMSM) is used. Based on the analysis of the operating principle of electric pitch and the control strategy of the servo-control system, a two-degree-of-freedom internal model controller is designed, which implements electric pitch system double optimal control of position tracking and anti-disturbance, also effectively suppresses the torque ripple. The simulation results prove that the control strategy is more effective than conventional PID control.