Étude et Amélioration d’un Filtre Actif Triphasé pour des Charges non linéaires

Abstract

The problem of harmonic pollution in distribution electrical networks is becoming more and more worrying with the increasing use of nonlinear loads. Active power filtering is one of the most effective solutions to this problem. In this work, nonlinear control of a three-phase shunt active power filter (SAPF) has been studied and compared to classical control based on proportional integral regulator. The control strategy is based on the direct current method using Input-Output Linearization, sliding mode control (SMC), and Backstepping where the aim is to regulate the average voltage across the dc bus of the inverter. The controller is comprised of a current loop which utilizes a SVPWM controller to generate the gating signals for the switching devices, in order to ensure full control of the system behavior in the presence of disturbances that affect the supply source, the load parameters or the reference value. The designed controller offers advantage that it can gives the improvement of dynamic and static performances in cases of large disturbances. A comparison of the effects of linear control and nonlinear control on the APF response in steady stat, under line variations, load variations, and different component variations is performed