A Discussion on Various Single Phase Rectifiers Reducing the Harmonics Each Other in the Power System

Abstract

For the rectifier circuits with small capacity such as for consumer electronics and appliances, the capacitor input type rectifier circuits are generally used. Consequently, various harmonics much generate in the power system, so hereafter harmonic problem will become more serious. We discuss harmonic reduction method by the parallel connection of the conventional converters in the power system. For such parallel connection, the current harmonics in the power system, especially the lower order harmonics such as the fifth or seventh, can be largely reduced due to the phase difference of the harmonics between conventional converters. Especially when numerous rectifier circuits with different constants are connected in the power system, the harmonic characteristic can be significantly improved, where the lower order harmonics such as fifth and seventh orders are much reduced. Above results are confirmed by theoretical and experimental implementations.