Shunt Active Power Filter with Hysteresis Current Control for three Phase Ac-Dc Converter

This paper represents the simulation of Shunt Active Power Filter(SAPF) based on p-q theory and using hysteresis current control to obtain the gating signals for three phase ac-dc converter. The proposed active power filter is employed to reduce the current Total Harmonic Distortion (THD) drawn by the non-linear load and compensate the reactive power. The PI controller is employed to reduce the ripple voltage of the dc capacitor of the inverter. Simulation of a shunt active power filter is done in PSIM software. Simulation results have been obtained, FFT analysis of source current and load current is also presented and Total harmonic distortion of source current is calculated before and after compensation and THD of the source current after compensation is below 5% which is in permissible limit imposed by IEEE-519 standard. 1. INTRODUCTION Thyristors converters and diode rectifiers with smoothing dc capacitors are a common source of harmonic currents. The distortion of the current results from the switching operation of thyristors and its harmonic amplitude is greatly affected by the impedance of the ac side. This type of harmonic source behaves like a current source. Therefore, they are called harmonic current source. These types of loads are a matter of serious problem as they cause flicker or harmonic interference in industrial applications, transmission and distribution systems