一种无滤波器的单相谐波检测方法

A Filter Free Single-Phase Harmonic Detection Method

针对单相有源电力滤波器(APF)谐波及无功电流检测的问题,提出一种无滤波器的单相谐波检测方法。将各次谐波电流分别分解为正、负序分量的叠加,再通过两相静止坐标系下的旋转叠加以滤出基波电流。无需传统检测方法的数字低通滤波器(LPF),检测精度、实时性高,并可以应对电网电压畸变等问题。最后仿真验证了检测方法的有效性。

In order to detect the harmonic and reactive current of single-phase active power filter（APF） system,a filter free single-phase harmonic detection method was proposed.First,the harmonic current is decomposed into positive and negative sequence components.Then this decomposed current is rotated and superimposed in the two-phase stationary coordinate system to achieve the purpose of filtering out fundamental current.Since it is unnecessary to use the traditional digital low pass filter（LPF）,this method has a high detection accuracy,high real-time performance,and can deal with the problem of power grid voltage distortion.The simulation verifies the effectiveness of the proposed method.