A Grid Connected Photovoltaic Microinverter with Integrated Battery

Abstract

This paper presents a single-stage three-port microinverter for single-phase grid-connected PV applications. A battery in the third port is dedicated to store the additional power generated from the PV panel. The battery also operates as a backup power source to compensate for the power mismatch between the source and the grid. The integrated three-port inverter operates under soft-switching technique so that the switching losses of the high frequency primary and secondary switches are negligible. To verify the theoretical analysis of the proposed topology, a 100-W three-port microinverter was designed and simulated.