THD Analysis of Five Phase Inverter for Different Conduction Modes

Abstract

Multi-phase supply has several advantages over three phase supply, it shows large contribution in motor concern by reducing torque pulsations, higher torque density, greater fault tolerance meanwhile it also reduces the required rating per inverter leg (simpler and more power conditioning equipment). To reduce the harmonics for smooth operation and to reduce heating in the equipment, the motor/load has to be supplied with multiphase supply greater than a three phase supply. Therefore five phase supply is preferred. This paper proposes a comparison of five phase supply fed inverter connected to star and delta connected load. The inverter drive is simulated for variable conduction periods i.e. from 72° to 180°. The FFT analysis is carried out for respective conduction periods.