An integrated transformerless photovoltaic inverter

Abstract

Transformerless inverters are widely used in grid-tied photovoltaic (PV) generation systems, due to the benefits of achieving high efficiency and low cost. The transformerless photovoltaic inverter may generate a leakage current between the inverter and the grid, through a parasitic capacitance. This leakage current will cause a low efficiency a distortion of the output and should the staff be in danger. Several transformerless inverter topologies have been proposed to reduce this leakage current. This paper proposes a different topology to reduce the leakage current problem, which consists of the stage integration of a full bridge inverter and a DC/DC boost converter. One output terminal of the inverter is connected directly to the ground; the inverter is controlled using the sliding mode control.