Comprehensive benefits analysis of electric vehicle charging station integrated photovoltaic and energy storage

Photovoltaic–energy storage charging station (PV-ES CS) combines photovoltaic (PV), battery energy storage system (BESS) and charging station together. As one of the most promising charging facilities, PV-ES CS plays a decisive role in improving the convenience of EV charging, saving energy and reducing pollution emissions. To promote PV-ES CS and improve the network of charging facilities, it is necessary to explore its comprehensive benefits. Firstly, to make full use of peak-to-valley electricity price difference and consume the power generated by the PV, this paper introduces the energy management strategy of the station based on time-of-use (TOU) electricity price. Secondly, from the perspective of multiple beneficiaries, a comprehensive benefits analysis model of charging station is proposed, including the benefits of PV-ES CS, power grid and society. Finally, the comprehensive benefits of the new charging station are analyzed through a PV-ES CS in Beijing. The impact of the construction cost reduction (including BESS cost and PV cost) and subsidy decline on the economy of the charging station is discussed. The government should further enrich charging stations subsidies. The results show that the social and economic benefits brought by PV-ES CS are far greater than the economic benefits of the station itself. With the development of the new charging facility in the future, it will bring considerable social and economic benefits and play a vital role in saving energy and reducing emissions.