在永磁风力发电系统中，为了减轻机侧变流器产生的脉宽调制（PWM）高频脉冲波对定子绕组的绝缘损害，降低谐波电流造成的发电机损耗，在分析传统PI控制策略的基础上，提出了一种新的策略。将谐振控制器与二自由度(2DOF)PID控制器相结合，设计谐振二自由度PID(R-2DOF PID)控制器，并通过粒子群(PSO)算法优化控制器参数，获得较强的电流跟踪能力、稳定的控制和良好的谐波电流抑制效果。同时，在机侧变流器端设计R_d阻尼型(滤波器电容支路串联电阻)LCLLC滤波器衰减PWM高频脉冲中的高次谐波，与传统PI控制结合R_d阻尼型LCL滤波器的谐波抑制策略相比，提出的控制器不仅能抑制电流谐波，实现电流环的无差拍控制，而且能减小外界扰动带来的影响，增强控制器的动态稳定性。使用MATLAB/Simulink对永磁同步发电机进行仿真试验，仿真结果表明，LCLLC滤波器对于滤除PWM高频脉冲的谐波成分效果较好，R-2DOF PID控制器可对周期信号进行无误差跟踪，达到抑制谐波的目的。

In the permanent magnet wind power generation system, it is necessary to reduce the insulation damage of the stator winding caused by the pulse width modulation (PWM) high frequency pulse wave generated from the generator side converter, and reduce the generator loss caused by the harmonic current. Based on the analysis of the traditional PI control strategy, a new strategy is proposed, in which a resonant two-degree-of-freedom (R-2DOF) PID controller is designed by combining the resonant controller with a 2DOF PID controller, and particle swarm optimization (PSO) algorithm is used to optimize the controller parameters. The controller has strong current tracking capability, stable control and good harmonic current suppression. At the same time, the R_d damping type (filter capacitor branch series resistance) LCLLC filter is used for the generator side converter to attenuate the high-order harmonics in the PWM high frequency pulses. In comparison with the existing harmonics suppression strategy combining traditional PI control with R_d damping type LCL filter, the proposed controller can not only suppress current harmonics, but also achieve the no-error control of the current loop. Moreover, the proposed controller can reduce the influence of external disturbance and enhance the dynamic stability. Simulation experiment of permanent magnet synchronous generator is carried out on MATLAB/Simulink. Simulation results show that the LCLLC filter has a good effect on filtering the harmonic components of the PWM high frequency pulse wave. The R-2DOF PID controller can track the periodic signal without error and achieve the suppression of harmonics.

新疆维吾尔自治区重点实验室开放课题(2017D04021)