New hybrid PWM converter having APF function

Abstract

A new topology for hybrid PWM AC/DC converter having active power filter (APF) function is presented. The hybrid converter is capable of annihilating current harmonics in the power system, while it functions as an AC to DC converter for a medium or large power rating DC load. In eliminating the harmonics with the proposed topology, the harmonic currents are divided into the converter and the passive filter, and a major portion of harmonics flows through the passive filter. Thus, the harmonic current load of the active switch is significantly reduced, and the harmonic elimination and the DC-link voltage regulation can be performed without using any additional major hardware nor increasing the current rating of the converter. The feasibility of the proposed hybrid PWM converter is confirmed by simulation.