有源电力滤波器谐波检测方法研究

摘要

In view of problem that common ip-iq harmonic current detection method cannot consider filtering effect and real-time performance simultaneously because of using digital low-pass filter, the paper put forward a kind of improved method using mathematical morphological filter to instead of digital low-pass filter. Through selecting proper structure elements, a low-pass morphological filter was designed combining with basic morphological operations. The simulation results showed that the real-time performance of improved method is better than the one of common harmonic detection method under ensuring detection accuracy, which has certain reference and practical value.%针对常用的ip-iq谐波电流检测方法因采用数字低通滤波器而存在滤波效果和实时性不能同时兼顾的问题,提出了一种采用数学形态滤波器代替数字低通滤波器的改进方法.通过选取适当的结构元素,结合形态学的基本运算,设计了低通形态滤波器.仿真结果表明,在保证检测精度的情况下,改进方法的实时性要明显好于常用的谐波检测方法,具有一定的参考、实用价值.