Single-phase active power filter with improved sliding mode control

This paper presents a study about a single-phase shunt active power filter with sliding mode control. The operation mode of the shunt active filter is detailed, introducing a new operating mode for the inverter in order to improve the behavior of the line current during the zero-passings. Regarding sliding mode control, the sliding surface, the existence condition and the equivalent control are analysed. The steady-state error is diminished by implementing a proposed sliding surface, which includes the current error and its integral. The expected results are confirmed through simulation.