A Single Phase Quasi H-Bridge Boost Inverter with Common Ground for Grid connected Applications

Abstract

This paper presents a single-phase quasi H-bridge boost inverter with common ground for grid-connected applications. In this topology, the ground of ac grid and input dc voltage source is connected together directly. So, the ground leakage current is significantly limited. Furthermore, by combining a switched-capacitor boost converter with quasi H-bridge inverter, the RMS of output voltage can be greater than input dc voltage source. With the introduced simple PWM strategy, single phase quasi H-bridge boost inverter with common ground is applicable to photovoltaic applications where a low dc voltage source have to be inverted to a desired ac output voltage without transformer. The operating principles and circuit analysis for the single phase quasi H-bridge boost inverter with common ground are described. Simulation results by PSIM software are implemented to validate the performance of the introduced topology.