Sliding Mode Control of a Shunt Active Filter-Comparative analysis with conventional PI control

The present paper deals with the sliding mode control of a three-phase shunt active filter SAPF. This one has to improve power quality by compensation for harmonics of non-linear load in power distribution systems. The sliding mode control is among the effective techniques in transient and steady-state regimes. Usually, the sliding mode control uses hysteresis a regulator resulting in variable switching frequency, however, in this paper, this frequency is kept constant by modulating the output control signal. The nonlinear load harmonics and reactive power are identified using the well-known p-q theory. To measure the performances of the proposed control, a comparative analysis is given using conventional PI control. As expected, the obtained results, using simulation tests, have confirmed the performances of the sliding mode control, and its superiority to the conventional PI control.