Improvement of Power Quality Using PQ Theory Based Series Hybrid Active Power Filter

Abstract

This paper investigate the power quality improvement under unbalanced supply condition. The current drawn is highly non-linear and contain harmonics. Shunt active filter eliminate only the current harmonics, not the voltage harmonics. But he series active filter provide harmonics isolation. SHAPF is suitable for compensation of source voltage, reactive power and reduce source current and voltage harmonics. It also eliminate series and parallel resonance. The control technique for the SHAPF is based on the Generalized Instantaneous Reactive Power Theory. The real and reactive power are converted into voltage component. Then the reference voltage are calculated inorder to compensate the source current and load voltage harmonics. Simulations have been carried out on MATLAB-Simulink Platform and results are presented.