Comparative Analysis of Various Multicarrier PWM Methods for Binary DC Source Inverter

Abstract

This paper focuses a new topology of an asymmetrical seven level inverter with binary DC sources. Multilevel inverter is triggered by using Unipolar Multicarrier Pulse Width Modulation (UMCPWM) method, sine and trapezoidal references with triangular carriers; it includes Phase Disposition (PD) method, Alternate Phase Opposition Disposition (APOD) method, Carrier Overlapping (CO) method and Variable Frequency (VF) method. The Performances measure like, Total Harmonic Distortion (THD), Fundamental V_RMS Crest Factor (CF), Form Factor (FF) and Distortion Factor (DF) are evaluated for various modulation indices. Simulation is carried out by using MATLAB-SIMUINK. It is observed that UMCVFPWM method provides lower THD, UMCCOPWM method provides higher fundamental V_RMS output voltage, and UMCAPODPWM method provides lower Distortion Factor.