双馈风电变流器谐波抑制的控制策略研究

Research on Control Strategy of Harmonic Suppression in DFIG Converter

针对异步双馈风力发电的网侧变流器,研究了电网的谐波畸变下网侧变流器控制策略。基于改进的PI-PLL和矢量控制理论,提出了一种消除谐波的反Park-PLL技术和dq谐波补偿的控制策略。同时,网侧变流器电流回馈电网时会使得谐波含量增加,采用串联LCL滤波器可以取得较好的滤波效果。通过Matlab仿真结果,验证了所提控制策略下的网侧电流谐波总畸变率较低,且系统动态响应快、稳定性高。

This article mainly aims at the grid-side converter （GSC） of asynchronous doubly-fed wind generation（DFIG） and studies the GSC control strategy in the situation of power grid harmonic distortion. It puts forward the control strategy of reverse Park-PLL technique and dq harmonic compensation for eliminating harmonics which is based on modified PI-PLL and vector control. Meanwhile, the GSC current feedback will cause harmonic increasing, the series LCL filter can obtain better filtering effect. Through the Matlab simulation result,it verifies the grid side current THD is lower and the system dynamic response is more quickly and the stability is higher under the control strategy.