Adapted Modulation For Thd Performance Improvement And Losses Reduction On Multilevel Inverters

Abstract

This paper presents an adapted carrierbased PWM modulation technique to be applied on both Neutral Point-Clamped (NPC) and Flying Capacitor (FC) structures of multilevel inverters. The proposed modulation leads to an improved performance on the output voltage THD. It also reduces the total loss dissipation across the semiconductors devices compared to other conventional carrier-based PWM modulation techniques, such as Phase-Shifted PWM (PSPWM) and Level-Shifted PWM (LSPWM). In order to demonstrate the effectiveness of the proposed technique, it was developed a three-phase, three-level, 6kW prototype for both NPC and FC topologies.