Simulation of Control Strategy of Three-Phase Four-Wire Four-Leg APF Based on Matlab

Based on the analysis of the main circuit’s topology of the three-phase four-wire parallel connection active power filer(APF),a current deadbeat control strategy was proposed,which could be implemented in the four-leg APF.A simulation study based on the control strategy using Matlab/Simulink was carried out,and experimental waveforms were given.The simulation result not only demonstrated that the strategy was able to suppress harmonics in the three-phase four-wire electric circuit,but also could compensate the three-phase unbalance.