Capacity allocation method for PV-storage-charging stations considering energy storage lifespan and operational benefits

Integrated photovoltaic storage and charging power stations use photovoltaic power generation and energy storage systems to achieve energy self-sufficiency, reducing the impact on the grid during peak charging hours. In response to the current problem of insufficient facility scale or redundancy in the configuration of photovoltaic storage charging stations, this paper proposes a method for configuring the photovoltaic storage capacity of integrated charging stations considering the lifespan of energy storage and operational efficiency. First, the cost of charging stations is systematically analyzed, and an energy storage life assessment model based on battery characteristics is constructed; Secondly, with maximizing the annual comprehensive revenue of the charging station as the upper-level optimization objective and reducing the load fluctuation of the charging station and increasing the operating revenue of the charging station as the lower-level optimization objective, a two-tier optimization model for the coordinated allocation of photovoltaic energy storage was constructed; Finally, the results of the case study show that the proposed photovoltaic storage capacity allocation method for charging stations can reduce the load peak-valley difference and increase the profit of photovoltaic storage charging stations.