Single stage multi-port Flyback type solar PV module integrated micro-inverter with battery backup

This paper proposes a single stage multi-port converter and control based on Flyback Principle for solar PV module integrated micro-inverter application. This configuration can be used for grid connected as well as standalone applications with battery backup. The topology provides galvanic isolation between solar PV, battery, and the load and achieves high voltage gain. Moreover, the battery does not have to handle the 100 Hz ripple power required by the AC load, neither during the day mode or the night mode. No additional circuitry is required to achieve this objective during night mode. All these features along with the power conversion in a single stage, lead to higher efficiency and significantly improve the battery life. In this paper, operating principle, modes, and control scheme of the proposed topology are discussed, which is followed by simulation results obtained through MATLAB-SIMULINK.