| In recent years,with the rapid development of electric vehicles and the synchronous development of charging facilities,the economic research of charging stations has attracted extensive attention from the industry and academia.Energy storage system(ESS)can store electric energy and discharge to provide electric energy at the required time.Under the background of the implementation of TOU price in current charging stations,considering its combined use with charging stations,it can improve the economy of charging stations to some extent.Energy storage capacity configuration is studied in this paper.Renewable energy solar energy has always been the focus of research in the industry.If the combined use of photovoltaic power generation,energy storage and charging stations is considered,that is,the establishment of photovoltaic charging stations can not only improve the utilization rate of clean energy,reduce carbon emissions and avoid environmental pollution,but also improve the economy of charging stations.Based on the 15-year planning period,charging station is analyzed and modeled.Considering the constraints of charging station load peak-cutting and energy storage system,the charging station energy storage optimal configuration model aiming at the economic optimization of the charging station is proposed in this paper.Further considering the combination of photovoltaic power generation,energy storage and charging station,an optimal configuration model of energy storage for photovoltaic charging station is established.The research work of this paper is divided into the following aspects:(1)The charging station of the research object is analyzed,and the types and charging modes of the charging stations are studied respectively.Charging stations have different types of charging piles due to their different service objects.Energy storage is an indispensable part of the operation of charging stations.Through analyzing the characteristics of various types of energy storage,the most suitable type of energy storage for charging stations is selected.Based on the above analysis,the overall model of the charging station is established.Then the charging station to add photovoltaic system is studied in this paper,that is,the analysis of the photovoltaic charging station,the establishment of the structure model of the photovoltaic charging station.Based on the randomness of the charging load,the typical charging load conditions of the charging station are established,which lay a foundation for the follow-up research in this paper.(2)Based on the analysis of charging stations and charging load operating conditions,energy storage system as the costs involved on the allocation of charging stations are analyzed,and the corresponding cost of energy storage system model is established.Based on this consideration,charging load peak-clipping is taken as a constraint condition.Taking the economic optimization of charging stations as the objective,the optimal energy storage configuration model of charging stations is established.(3)On the basis of the above research,the addition of photovoltaic system into the charging station is considered.All possible photovoltaic output situations of the photovoltaic charging station are analyzed in the planning period and their probabilities are calculated accordingly.Based on the comprehensive consideration of charging load and photovoltaic randomness,the combined scenarios of the energy storage configuration model are established,and the probabilities of the corresponding scenarios are calculated.Based on the established combined scenarios,the optimal energy storage configuration model of photovoltaic charging station is established with the objective of optimizing the economic of the charging station.The model established in this paper is solved by particle swarm optimization algorithm,and the energy storage optimization results of charging stations without energy storage,only considering energy storage and adding photovoltaic system are compared and analyzed. |
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