The Study Of Three-phase Shunt APF With LCL Filter

Because of the active power filter in harmonic control, accurate, more and more enterprises recognized this as an opportunity to study the three-phase shunt active power filter in the laboratory.This article from the single-phase half bridge APF topology is simple to start, from the macroscopic angle modulation of topology evolution, and extended to the three-phase three wire bridge; for the selection of LCL filter parameters, proposed to split into independent strategy analysis of single inductor and LC filter, simple design method of LCL filter parameters obtained from the angle of projection and ripple; on the base of ip-iq method, expand the derived any positive sequence, negative sequence harmonic current extraction method; the traditional three-phase software PLL strategy are improved, designed the three-phase phase-locked strategy of dynamic, steady state performance into account, and extend to the single-phase software phase-locked; from the compensation current influence on the fluctuation of DC bus voltage angle, the conventional the voltage loop is designed to reduce the voltage ripple effects on the APF harmonic compensation; half bridge driver dead time will affect the current tracking control, repetitive control strategy using the high steady state performance of the current tracking.Symmetry for phase three-wire resistive inductive load, resistive and capacitive loads and three-phase three-wire asymmetric load, build Matlab/Simulink simulation and experimental platforms, and get good result,verified the feasibility APF research method.