Comparison of Level Shifted SPWM Methods for Three Phase, Seven Level Reduced Switch Based Multilevel Inverter

Recent developments have made multilevel inverters a crucial alternative in implementations requiring high power and high voltage. Various applications, including electric vehicles, renewable energy conversion systems, etc., utilize a variety of multilevel inverter topologies. Primary objective of recent innovative reduced switch-based multilevel inverter topologies is to use fewer components than classical topologies. This research examines various level shifted multi- carrier SPWM (Sinusoidal Pulse Width Modulation) methods for a three-phase, seven-level, reduced switch-based MLI (Multilevel Inverter) topology, including in-phase, phase opposition, and alternate-phase opposition disposition. These methods are suggested by several authors in order to guarantee effective voltage utilization and an improved harmonic spectrum. The THD (Total Harmonic Distortion) of outputvoltage and current has been given special attention. MATLAB/Simulink 2016 platform was used for simulation and analysis.