两种单相电路瞬时谐波及无功电流实时检测方法分析

针对单相电路有源电力滤波器(APF)对谐波及无功电流检测的要求，本文提出了两种检测方法，并分别给出了检测原理图．前者是基于时域分析的有功电流分离法，本文对其进行了改进；后者是基于瞬时无功功率理论的谐波分离法．理论分析和仿真结果证明两种方法都能实时的检测出单相电路中瞬时谐波及无功电流，前者算法和实现更为简单．稳态和暂态运行的仿真波形证实了文中所提方法的有效性．

THE ANALYSIS OF TWO REAL-TIME DETECTING APPROACHES OF INSTANTANEOUS HARMONIC AND REACTIVE CURRENT IN SINGLE-PHASE CIRCUIT

This paper presents two detecting methods of harmonic and reactive current for A ctive Power Filter(APF)in single phase circuit in order to meet the demand of A PF,and gives principle diagram of detecting circuit respectively.The former is a ctive current separate method based on time domain,which is developed in the pap er;the later is harmonic current separate method based on instantaneous reactive power theory.Theory analysis and simulation results verify that instantaneous h armonic and reactive power theory.Theory analysis and simulation results verify that instantaneous harmonic and reactive currents in single phase circuit can b e detected in real time with the methods,and the former is simpler in algorithm and implement.Simulation waveforms for steady state and transient operating cond itions show the effectiveness of the proposed methods.