Adaptive harmonic compensation of shunt active power filter using sliding mode controller

This paper presents adaptive sliding mode technique with application to single-phase shunt active power filter (APF). Based on the basic principle of single-phase shunt APF, the approximate dynamic model is derived. An adaptive sliding mode control algorithm is proposed to implement the harmonic compensation for the single-phase shunt APF. This method uses the tracking error of harmonic and APF current as the control input, and adopts the tracking error of reference model and APF output as the control objects of adaptive sliding mode. In the reference current tracking loop, a novel adaptive sliding mode controller is implemented to tracking the reference currents, thus improving harmonic eliminating performance. Simulation results demonstrate the satisfactory control performance and rapid compensation ability of the proposed controller under different conditions of the nonlinear load current distortion and the mutation load respectively.