低通滤波器对i_p-i_q运算检测法检测效果的影响与分析

Influence and Analysis of Low-pass Filter on Detection Effect of i_p-i_q Computing Detection

基于瞬时无功功率理论的i_p-i_q检测法中低通滤波器会使检测结果产生延迟,检测效果不好。为了提高检测效果,本文对三种典型低通滤波器关于谐波电流检测效果的影响进行了仿真研究,通过比较发现Butterworth低通滤波器对检测结果的延迟较大,基于最小均方自适应原理的低通滤波器的检测结果精度不高,而所提出的积分低通滤波器的检测结果具有良好的实时性和精确度。因此,采用积分低通滤波器对谐波检测具有优越性能。

The low-pass filter in i_p-i_q detection method based on the instantaneous reactive power theory delays the detection result, making the detection effect worse. In this paper, the effects of three kinds of typical low-pass filters on harmonic current detection effects are simulated. Through comparison, it is found that the Butterworth low-pass filter has a large delay to the detection results, and a low-pass filter based on least mean square adaptive principle is used. The accuracy of the detection results is not high, and the proposed integrated low-pass filter is good in real-time and accuracy. Therefore, the superior performance of the harmonic detection effect using the integrated low-pass filter is verified.