一种新型的谐波及无功电流检测算法

为了实现有源电力滤波器(APF)谐波电流的快速、精确检测,对谐波电流的检测算法进行了研究,提出了一种新型的谐波电流检测方法,利用对称基准旋转相量求解基波正序有功电流的幅值,分别计算电压、电流与基准旋转相量相位差的正余弦值,从而求出基波功率角,消除基准旋转相量与电网电压的相位偏差。Matlab仿真结果表明,在电网电压不对称、且畸变的情况下,能准确提取基波正序有功电流,适用于有源电力滤波系统中谐波、无功及负序电流的综合补偿。

A Novel Algorithm for Detection of Harmonic and Reactive Current

In order to realize fast and precise detection of harmonic currents for active power filter（APF）,the detection methods of harmonic currents was studied and a novel harmonic current detecting method was presented.By use of the symmetrical rotating reference phasors,the amplitude of fundamental frequency positive-sequence active current was solved,and the sinusoidal and cosinusoidal phase difference values of power grid voltages and currents to rotating reference phasors were calculated respectively to solve the power angle,and the phase deviation between rotating reference phasors and power grid voltages was eliminated.Simulation results show that the new method can work out the fundamental positive-sequence active currents precisely under unsymmetrical and distorted voltage supply conditions,thereby it can be used to compensate for harmonic,reactive and negative-sequence currents synthetically.