A soft-switched three-port single-stage inverter for photovoltaic-battery systems

This paper proposes a soft-switched three-port single-stage inverter (TPSI) for a photovoltaic (PV)-battery system. Compared to the existing soft-switched TPSIs, the proposed TPSI has the advantages of using the least number of switches and that all of the switches are capable of being turned on under the zero voltage switching (ZVS) condition. A prototype of the TPSI without using electrolytic capacitors is built to verify the proposed topology. Experimental results show that the proposed TPSI is effective in managing the power flows among the three ports while maintaining the desired sinusoidal voltage at the load port.