Improved wave shape-pattern performance using Phase Opposite Disposition (POD) method for cascaded multilevel inverter

Abstract

Nowadays, power electronics inverters are widely used due to the increasing of the power demand. Thus the device such as multilevel inverter was used to perform the required energy conversion. However, multilevel inverter is operated without harmonic-less. This total harmonic distortion (THD) producing from multilevel inverter is generated from the sinusoidal output waveform. This paper presents level-shifted SPWM technique of single-phase 5-level Cascaded H-Bridge (CHB) inverter. This research aims of assessing the importance of accuracy of the pattern of the wave shape and harmonic distortions of the output voltage by controlling the modulation indices. The proposed method uses Phase Opposite Disposition (POD) modulation strategy to evaluate the waveform and harmonic performances. The simulation results were verified through experimental study.