三相电路谐波和负序电流检测方法实验研究

Experiment Study of A Detecting Method for Harmonic and Nega tive Current in Three-Phase Circuit

电力电子技术的发展和应用，电力系统中的谐波电流污染越来越严重，而且由于负载的不对称产生负序电流。正确评价用户电能质量的好坏，如何消除这些电流分量，均要求准确检测这些电流分量。本文提出了一种用有源ＲＣ电路检测三相电路谐波、负序电流分量的方法，并对该检测方法和电路性能进行了理论分析。实验和仿真证明了所提方法的正确性。

Application and development of electric electronic technology in power system brings about more and more serious harmonic current pollution day after day. Unsymmetrical load produces negative current, which has been threatening the safe operation of power system. This paper presents a method for detecting harmonic and negative current in three circuit through an active RC circuit. The detecting method and the characteristic of the active RC circuit have been analyzed the oretically, and demonstrated with experiments and digital simulation. It is required that these current components be detected in order to evaluate the quality of electric energy correctly and the eliminate them.