Four-Switch Single-Phase Common-Ground PV Inverter with Active Power Decoupling

Abstract

This letter presents a transformerless single-phase PV inverter, which combines with common-ground (CG) and active power decoupling (APD) techniques. The leakage current is eliminated and bulky electrolytic capacitors are removed, thus improving the system safety and reliability. In addition, it needs only four switches and can be implemented conveniently by a commercial H-bridge module. The validity of the inverter is verified with a 2-kW prototype.