An overview of transformerless inverters for grid connected photovoltaic system

In last decade, the booming research on various aspects of grid-connected Photovoltaic (PV) systems has been observed. In the distribution system a grid-connected inverter is an important unit to interface Renewable Energy Resource (RER) with a utility grid. Now a days, the interest of solar market is increased by the development and new designs of Single Phase Transformerless Inverters (SPTI) for Photovoltaic System Connected to the Grid-Connected ranging from 1kw to 10kw. To compare the inverter based on transformer galvanic isolations, its favorable properties are: Light in weight, low cost, small in volume, simplicity and high efficiency. In these topologies, galvanic isolation can be achieved by including additional switches either at the input (DC) side or at output (AC) side. The AC side has high efficiency as it has low number of switches in conduction path. In proposed paper, a comprehensive review is presented on SPTG-CPV inverters. Power converters technology and topologies for PV systems are comprehensively reviewed. Comparison and evaluation on the basis of efficiency, total hormonic distortion, weaknesses, strengths, leakage current and semiconductor losses is also performed. Future trends and selection of efficient topology for new researchers, designer, and engineers is similarly focused.