Transformer less Hybrid Bridge Inverter for Photovoltaic Grid Connected Systems

Abstract

The transformer-less inverters is trending in the grid-connected single-phase photovoltaic (PV) systems, for their high efficiency with low cost. The interface between the PV power source and the grid is formed using the DC/AC inverters. The common-mode ground leakage current surfaces are considered in between the solar panels and ground for parasitic capacitor. These inverters sustain in low input voltage similar to full-bridge inverter and eliminate common-mode leakage current. The essential requirement in proposed system is the reduction of leakage current to reduce the cost and increase the efficiency.  An advanced hybrid- bridge transformer-less inverter is obtained by combining the half-bridge and ground point voltage level shifting modules. This reduces leakage current and the bus voltage required when compared to the basic half-bridge or neutral point clamping  inverters.