Influence of three-phase voltage unbalance upon harmonic contents of the TRTS DC power supply and its motor-car driving systems

Abstract

This paper studies the influences of three-phase voltage unbalance on the DC network of the Taipei Rapid Transit System (TRTS) using EMTP. Also studied are harmonic currents produced by VVVF inverters of the motor-cars and possible harmonic resonance resulting from the inverter filter.