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Performance Analysis of Modified CHB Multilevel Inverter using Various Carrier Modulation Schemes

This paper describes various Carrier Modulation PWM scheme and its performance analysis for nine-level Modified Cascaded H-Bridge Multilevel Inverter (M-CHB-MLI). This M-CHB-MLI topology with a multi conversion cell consists of four equal voltage sources with four controlled switches and four diodes. Instead of 16-controlled switches used in conventional topology for 9-level output voltage, only eight controlled switches are required for 9-level M-CHB-MLI topology which in turn reduces the switches losses and also improves its performance parameters. The various carrier modulation schemes are applied for this M-CHB-MLI to analyze its output voltage harmonics and Vrms.