Single Phase Transformer Less Grid Connected PV Inverter Topologies (A Review)

In the field of energy conversion lot of research in transformer less inverters is in development. Photovoltaic system connecting with the electrical grid, transformer less inverters has proved to be a good option due to their good output in energy conversion method. Earlier PV system with transformer were used which have efficiency in the range of 92% - 94%. For better performance of PV inverter, an innovative system, PV inverter without transformer is introduced presently by researchers. In this new technology researchers introduced different types of topologies. In this paper different configurations given by researchers such as H5, H6, HERIC, Dual paralleled buck inverter are compared. In order to resolve difficulties such as leakage current, compact size, improved or high efficiency, protection and difficulties related to common mode voltage transformer less inverter configurations are introduced by different researchers. In this paper different topologies are reviewed on above factors and analyzed.