An improved transformerless grid-connected photovoltaic inverter with reduced leakage current and increasing number of output voltage level

Abstract

One of the most favored for grid connected photovoltaic (PV) generation system due to higher productivity and lower price is transformerless inverters. The two key clues for transformerless PV grid-connected inverter are Low leakage current and high productivity. Nonetheless, the leakage current which lessens the power quality and produces electro-magnetic interference in transformerless PV inverter, has to be addressed accurately in order to examine the safety regulations. This paper presents a multilevel transformerless single-phase inverter, which consists of one H-bridge, one bidirectional switch and one damper circuit to decrease the ground leakage current. The planned inverter configuration and the transformerless single-phase inverters are compared based on the power circuit component count. Furthermore, the power lossed in the power semiconductor switches of the presented and several existing topology is analyzed. Finally, proposed topology is simulated by MATLABI Simulink software to confirm the correctness of the theoretical analysis.