Energy Storage Configuration for EV Fast Charging Station Considering Characteristics of Charging Load and Wind Power Fluctuation

Fast charging stations play an essential role in the widespread use of electric vehicles (EV), and they have great impacts on the connected distribution network due to their intermittent power fluctuations. Therefore, combined with rapid adjustment feature of the energy storage system (ESS), this paper proposes a configuration method of ESS for EV fast charging station considering characteristics of charging load and wind power fluctuation. The energy storage configuration can alleviate the impacts of fast charging station on distribution network and improve its operation economy at the same time. First, wind power in distribution network is modeled by scenario method, and charging demand in a station is calculated considering EV characteristics as well as probability of driving. Second, taking the optimized total costs of ESS for EV fast charging station within its life cycle as the objective, the configuration model of the ESS in distribution network is established while such factors as investment, operation, and wind curtailment cost and income of arbitrage are considered. Finally, the model is linearized and solved by GAMS. The feasibility and economic efficiency of the proposed model are verified by an improved IEEE-33 node system.