A Novel High Gain Single-phase Transformer-less Multi-level Micro-inverter

摘要

This paper proposes a transformer-less high gain multi-level single phase micro-inverter. The proposed topology integrates full-bridge inverter into DC link consists of switched capacitors network. By a proper connection of the DC link capacitors, the output voltage levels can be generated. A proper modulation and control algorithms have been developed for the proposed topology. Compared to other micro-inverters, the proposed one offers much higher gain along with multi-level shaping of the output voltage. The operating modes of the proposed topology are illustrated. The voltage stress of all components is identified. Simulation and experimental validation for the proper operation of the 7-level version of the proposed topology are carried out.