Hybrid Control of Single Phase Shunt Active Power Filter Based on Interleaved Buck Converter

This paper focuses on the problem of controlling a single phase half bridge active power filter based on interleaved Buck converter (APF-IB). The control objectives are twofold: i) ensuring power factor correction by compensating the harmonic currents and reactive power absorbed by the nonlinear load; ii) regulating the DC bus voltage of the converter to a desired value. The considered problem is dealt with using a controller that is hierarchically decomposed in two control loop. The first one is designed, using a hybrid approach in which the switching control law is determined to cope with the compensation issue and the second, is designed by a proportional integral to regulate the DC link capacitor voltage. The APF-IB system is modeled by hybrid automaton theory based on finite state machine (FSM) which of taking into account the different operating mode. The simulation results have been performed through Matlab/SimPowerSystems and Stateflow toolbox, show that the proposed control meets its objectives and prove that it is robust with respect to load changes.