Switching Frequency Optimal PWM Based Three Phase Hybrid Multilevel Inverter

Abstract

Abstract This paper presents the performance analysis of switching frequency optimal (SFO) pulse width modulation technique for a three phase hybrid multilevel inverter. Three phase hybrid multilevel inverter structure comprises of less number of DC sources, power switches and carriers when compared with cascaded H-bridge multilevel inverter. Triangular carrier and inverted sine carrier arranged in phase disposition (PD) and Alternate phase opposition disposition (APOD) are used as multicarriers for generating the pulses. The parameters chosen for the analysis are fundamental output voltage, DC utilization rate and total harmonic distortion. The result analysis reveals that the inverted sine carrier with PD PWM technique provides high RMS output voltage and DC utilization rate which can be utilized for PV array based inverter fed grid applications.