Performance Comparison of PWM Methods for 27-Level Hybrid Multilevel Inverters

Abstract

Multilevel inverters have become more popular due to reduced switching losses, low costs, low harmonic distortion and high-voltage capability when compared to traditional PWM inverters. A new family of multilevel inverters that has decreased the number of separated DC sources has emerged named as hybrid multilevel inverter. In this study, theories and applications of four PWM modulation methods for 27 level hybrid multilevel inverters are examined. The comparative case studies are presented to validate the examined modulation technique through harmonic spectrum analysis, output voltage magnitude, THD, WTHD and simulation using Power System Computer Aided Design Program (PSCAD).

Keywords

• Hybrid multilevel inverters
• H-bridge inverters
• Reference signal generation
• Pulse width modulation (PWM).

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