High Efficient Transformer-Less Full Bridge Inverter with Improved PV System for Grid-Tied Connection

In this paper a High Efficient Transformer-Less Full Bridge Inverter with Improved PV System for Grid-Tied Connection have been proposed. Transformer-less inverters are widely used in grid-tied photovoltaic (PV) generation systems, due to the benefits of achieving high efficiency and low cost. The power losses and power device costs are compared between the H5, and the proposed H6 topologies. In this paper, a family of H6 transformer-less inverter topologies with low leakage currents is proposed with MPPT PV systems. Various transformer-less inverter topologies have been proposed to meet the safety requirement of leakage currents. One of the proposed H6 inverter topologies is taken as an example for detail analysis with operation modes and modulation strategy. Simulation results show that the proposed H6 topology achieves similar performance in leakage currents, which is slightly worse than that of the H5 topology, but it features higher efficiency than that of H5 topology.