Active power filter based on interleaved buck converter

Abstract

Power quality problem is a major problem now days. Causes of this problem can’t be avoided but it can be mitigate. Active power filter (APF) plays a major role to improve the power quality. These active power filters mainly used are of voltage source type converters. Apart from all the advantages an active power filter it suffers from “shoot- through” phenomenon. Dead time is generally aided in firing pulses to avoid this phenomenon. This addition of dead time eliminates the “Shoot through” phenomena but it results in poor compensation performance. A family of shunt active power filter based on interleaved buck converter (IBC) is explained in this thesis. This interleaved configuration based on the buck converter combination is advanced for its high frequency and high efficiency, in which the "shoot-through" is eliminated inherently without introducing the dead time. In this thesis, the operation principle of active power filter based on buck switch cell is analyzed in detail. Features of interleaved buck cell are analyzed. “Shoot through” and dead time effect described briefly. Comparatively study of conventional method and half cycle modulated current controller is done. Corresponding control strategies are applied in bridge, full bridge, three-phase and three-phase four wire configuration. Simulation results are shown to verify the feasibility of the novel active power filter. This family of shunt APF used in the application with high reliability requirement and high compensation performance.