基于d-q变换的有源滤波器并联运行分析

APF parallel operation based on d-q transform

针对大功率的非线性负载工作时产生的谐波和无功电流,研究了采用多组有源滤波器并联运行对谐波和无功电流进行补偿的方法。采用d-q变换方法,研究了有源滤波器的电流检测和控制算法,并建立了有源滤波器的参考电流的限流算法的研究模型,提出了比例限流和门槛限流2种限制参考电流的算法。在此基础上提出了一种适合多组有源滤波器并联运行的控制策略。最后对所提出的限制参考电流和多组有源滤波器并联运行的控制策略进行了仿真,通过仿真分析可知所提出的限制参考电流的方法可以限制有源滤波器的补偿电流,从而实现多组并联运行,提高了有源滤波器的整体补偿容量。

The method of harmonics and reactive power current compensation is provided for the nonlinear power loads,which applies muhiple APFs operating in parallel. The algorithm of current detection and control is analyzed with d-q transform and the research model of reference current for muhi- APF operation is established based on the limited current algorithm. Two ways are given to limit the APF reference current：proportional algorithm and threshold algorithm,based on which the control strategy is presented for the parallel operation of muhiple APFs. Simulation results Show that, the proposed method limits the compensating current of APF,realizes the muhi- APF parallel operation,and enlarges its compensating capability.