Fuz4, logic controller of fîve levels active povver filter

Abstract

This paper presents five-level inverter as a shunt active power filter (SAPF) to compensate reactive power and suppresses hamonics &'awn from a diode rectifier supplying RL load under distorted voltage conditions. The harmonic current extraction is based on the use of self tuning filter (STF) and fi:zzy logic contooller employed to control harmonic current and inverter DC voltage. The aim ofthe present work is to obtain a perfect compensation by extracting aocurate harmonic currents to improve the performances of the five-levels active po'*-er filters. The proposed scheme is validated by computer simulation using MATLAB Fuzzy Logic Toolbox in order to show the effectiveness and ability of this method. The results have demonstrated that the proposed shunt active power filter with STF and Fuzzy Logic Controller (FLC) have produced a sinusoidal supply current with low harmonic distortion and in phase with the line voltage.