Abstract

In this article, a less switch cascaded H-bridge multilevel inverter has been proposed using reduced number of switches. A standard cascaded multilevel inverter requires 4h number of switches for (2h + 1) levels, whereas h is the number of dc sources. This proposed scheme allows reduced number of switches for the same level. Less switch cascaded H-bridge multilevel inverter-fed induction motor shows the better performance due to fundamental frequency switching scheme using Selective Harmonic Elimination technique. High-quality output is derived due to the absence of lower order harmonics. High conversion efficiency is also achieved for induction motor drive when it is operated with the proposed method. When the levels are increased, the number of switches used is very less compared to the conventional cascaded H-bridge multilevel inverter. The performance of three-phase less switch cascaded H-bridge multilevel inverter with equal dc sources is simulated using MATLAB platform. Harmonic analysis is done on the proposed cascaded H-bridge multilevel inverter with various levels.

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