Two-Stage Single-Source Full-Bridge Based Three- Phase Inverter for Medium Voltage Applications

Conventional half-bridge based three-phase inverter (HB-TPI) and neutral-point-clamped inverters (NPC) are popular in industry. Nevertheless, they suffer from the buck characteristics. To tackle the issue, this paper proposes a new full-bridge-based inverter topology which is able to develop a stepped ac voltage with low voltage stress across the components. Since the inverter side of the proposed inverter is based on switched capacitor, it is integrated with a front-end dc- dc converter to further increase the voltage gain and avoid inrush current. Simulation results are provided to validate the feasibility and effectiveness of the proposed inverter.