A Novel Single-Phase Transformerless Grid-Connected PV Inverter

This paper proposes a topology of a transformerless inverter with ac-decoupling and dc-link midpoint clamping for PV systems to solve the issue of leakage currents by eliminating common-mode voltage fluctuation. The operating principle of the clamping branch which ensures the constant common-mode voltage is explained in detail. A comparison with other conventional topologies is performed. The proposed topology presents a reduction of the leakage current, in addition to a lower number of devices in the current path, ensuring lower losses. Simulation results are presented in order to demonstrate the performance of the new topology.