APF改进型指定次谐波电流补偿控制策略

摘要

有源电力滤波器(APF)是解决由非线性负载造成谐波污染的有效手段之一.基于多同步旋转坐标系的谐波提取策略,兼顾动态和稳态响应,提出一种改进型指定次谐波电流补偿控制策略.该控制策略通过对各次谐波电流进行比例积分(PI)闭环控制,以达到较好的稳态补偿效果;通过无差拍控制解决系统补偿的动态响应问题,实现了指定次谐波电流的补偿,同时保证了系统的动态性能和稳态精度.实验结果验证了所提改进型谐波电流补偿控制策略的有效性.%The active power filter(APF) is one of the effective methods to solve the harmonic pollution caused by noninear load.Based on harmonic extraction in the synchronous rotating coordinate,an improved control strategy of selective harmonic current compensation is proposed,and considering both the dynamic and steady-state response.Through the proportional integral (P I) control of each harmonic current,a better steady-state compensation effect is achieved,and the dynamic response of the system compensation is solved by deadbeat control.This strategy realizes the compensation of the selective harmonic current,ensures the dynamic performance and the steady-state precision of the system.The experimental results verify the effectiveness of the control strategy.