Comparative Analysis of Three Topologies of Three-Phase Five Level Inverter

This paper presents the simulation and analysis of the three topologies of three phase 5-level inverter. We have considered the Flying Capacitor Multilevel Inverter (FCMLI), the Neutral Point Clamped or the Diode Clamped Multilevel Inverter (NPCMLI or DCMLI) and the Cascaded H-Bridge Multilevel Inverter (H-bridge MLI). The comparison between these inverters is based on the %THD present in the output voltage. Each inverter is controlled by the multi-carrier sinusoidal pulse width modulation (SPWM). The analysis shows that the total harmonic distortion (THD) is approximately 23% for DCMLI and 22% for PWM H-Bridge topologies, and it is about 24% for the FCMLI topology. The comparative results of the harmonic analysis have been obtained in MATLAB/SIMULINK.