A Transformerless Common-Ground Three-Switch Single-Phase Inverter for Photovoltaic Systems

In this article, a single-phase transformerless inverter for photovoltaic (PV) applications is introduced. The proposed inverter provides common ground between input and output terminals, which results in the elimination of the leakage current in the PV systems. Moreover, the voltage gain of the proposed inverter is higher than that of the single-phase quasi-Z-source and semi-Z-source inverters. Utilizing the film capacitors makes the proposed inverter more reliable and also increases its lifetime. The operation of the proposed inverter is analyzed in detail. Finally, the performance of the proposed inverter is verified through the experimental results both in off-grid and grid-tied operation modes.