三相不平衡电网谐波电流检测方法的研究

如今,电网谐波污染日益严重,如何进行谐波的抑制已经成为现代电力研究中的一个重要课题,有源滤波器是谐波抑制的主要方法之一。准确、快速地检测出电网电流中的谐波成分是谐波抑制和无功补偿的关键。提出了一种基于瞬时无功功率理论改进的谐波电流检测方法,该方法能在电网不平衡状态下只检测出谐波电流,而不会将基波负序电流和谐波电流同时提出,也能适用于电网平衡时的谐波电流检测。运用MATLAB仿真软件表明：该方法是正确的和有效的,且检测精度高,动态响应快。

Research on Method of Harmonic Current Detection for Unbalanced Three-Phase Power System

Now, harmonic puality of power network has increasingly deteriorated, how to restrain harmonic becomes an urgent issue of modern electric research. The active power filter（APF） is the main method of harmonic suppression. The paper presents an algorithm of detecting the harmonic current based on instantaneous reactive power theory. The mothod can only check out the harmonic current from the grid under the unbalanced conditions and can not pick the base negative current out at the same time, it can also detect the harmonic current under the balanced grid. Simulation results with MATLAB software show that this method is correct and effective. High detection precision and quick dynamic response are obtained.