Hardware implementation of improved transformer-less grid-connected pv inverter topologies with constant common mode voltage and enhanced efficiency

Due to their small size, light weight, low cost and increased efficiency, transformer-less inverters with grid integration are becoming more and more common. Galvanic connection between the photovoltaics and the grid is the main drawback of transformer-less inverters. The parasitic capacitance present between the Photovoltaic and the ground gives rise to common mode current. This leakage current poses a threat to the life of the person coming in contact with this system. It also gives rise to electromagnetic interference. Hence, this paper has proposed a Novel H6-Inverter to eliminate leakage current and maintain a consistent common mode voltage. The superiority of the proposed inverter is confirmed by comparing its performance with existing transformer-less inverters such as H5, H6-I, H6-II, and HERIC in terms of common mode voltage and leakage current. Firstly, the above inverters are simulated using MATLAB/SIMULINK software and then validated by using OPAL-RT, a real-time simulator.