Total and selective harmonic currents suppression based on three-phase four-wire shunt active power filter

Abstract

This paper proposes a simulation of Three-Phase Four-Wire Shunt Active Power Filter (SAPF) destined to suppress total and selective harmonic currents generated by nonlinear loads in low voltage networks. The SAPF ensures also the compensation for harmonic neutral current, reactive power and unbalanced nonlinear load currents. The identification method is based on the synchronous reference frame (SRF). In addition, it uses adaptive filters in order to suppress the harmonic components selection.In order to have good performances of compensation, Improved Backstepping control (Im-Bac) for SAPF system is proposed. Complete simulation of the resultant active filtering system validates the efficiency of the proposed Im-Bac law. Compared to the traditional control, the used of Im-Bac allows to improve the transient response during balanced and unbalanced load.