移动平均在并联有源电力滤波器中的应用

在并联型有源电力滤波器的设计中,若采用d,q同步旋转变换来提取谐波电流,则低通滤波器(Low Pass Filter,简称LPF)是设计的关键环节.介绍了d,q同步旋转变换和采用移动平均算法的LPF的基本原理,并通过仿真与常用的Butterworth LPF相比较,证明了移动平均算法在动态响应速度(15 ms以内)和稳态精度方面具有一定的优势.经试验验证,动态响应速度为15 ms,补偿后电流的THD达到2%左右,由此得出结论,基于移动平均算法的LPF具有优良的动态响应速度和稳态精度.

Application of Moving Average Algorithm for Shunt Active Power Filter

In the design of the shunt active power filter,the Low Pass Filter(LPF) is very important if we detect the harmonic current in d,q synchronous rotating frame.This paper introduces the principle of harmonic current detection in d,q synchronous rotating frame and the LPF based on the moving average algorithm,then compares the moving average algorithm LPF with the Butterworth LPF in the simulation.It is proved that the mentioned algorithm is advanced in the dynamic response speed(within 15ms) and the steady state compensation precision.Finally,the experimental results proved that the dynamic response time is 15ms and the Total Harmonic Distorsion(THD) of the compensation current is about 2%.So we can reach a conclusion that the LPF based on the moving average algorithm has the excellent dynamic response speed and the steady state compensation precision.