Operation strategy for a lab-scale grid-connected photovoltaic generation system integrated with battery energy storage

•The operation strategy for grid-connected PV generation system integrated with battery energy storage is proposed.•The PV system is composed of an inverter and two DC-DC converter.•The negative impact of grid-connected PV generation systems on the grid can be alleviated by integrating a battery.•The operation of the developed system can be divided into nine modes. The operation strategy for a lab-scale grid-connected photovoltaic generation system integrated with battery energy storage is proposed in this paper. The photovoltaic generation system is composed of a full-bridge inverter, a DC–DC boost converter, an isolated bidirectional DC–DC converter, a solar cell array and a battery set. Since the battery set acts as an energy buffer to adjust the power generation of the solar cell array, the negative impact on power quality caused by the intermittent and unstable output power from a solar cell array is alleviated, so the penetration rate of the grid-connected photovoltaic generation system is increased. A lab-scale prototype is developed to verify the performance of the system. The experimental results show that it achieves the expected performance.