An improved control circuit for Series Hybrid Active Power Filter compensating current-voltage harmonics, reactive power and supply unbalance

In the area of power quality conditioners, the Series Hybrid Active Power Filter (SHAPF) has been focused more because of its multi-functionality and lower inverter rating requirement. Existing control strategies for SHAPF are based on extracting either source current harmonics or load voltage harmonics and are valid for balanced source and load conditions. In this paper, a novel control scheme based on generalised instantaneous power theory for SHAPF is proposed. This control scheme is valid for balanced and unbalanced source conditions and is capable of balancing load voltage while compensating supply current harmonic, load voltage harmonics and load reactive power. The mathematical formulation of the proposed control scheme with its applications to SHAPF is presented. The validity of the proposed control scheme is verified by the simulation study.