Research On Charging Strategy Of EV Charging Station Based On Wind Power Consumption

In recent years,driven by the problems of energy security and urban pollution,electric vehicles have been vigorously developed around the world.As the number of electric vehicles continues to increase,how to achieve safe,reliable and economical operation between electric vehicle charging load and distribution network is an urgent problem to be solved.In addition,with the achievement of China’s carbon peak and carbon neutral goals,the proportion of wind power and other renewable energy sources in the total power generation is increasing,and because of the natural volatility and intermittency of wind power output,its impact on the planning and operation of the distribution network is also more important.The power battery of electric vehicles has large capacity and high energy density.Through the unified management of electric vehicle charging load,it can quickly follow the fluctuation of wind power output power,reduce the configuration of energy storage capacity,realize the local consumption of renewable energy and ensure the stable and economic operation of distribution network.Therefore,it is of great practical significance to consider the wind power consumption of EV charging stations to realize the full utilization of wind power in EV charging stations and reduce the adverse impact of charging load on grid operation.Firstly,the feasibility of establishing an integrated system of EV charging stations and renewable energy sources is analyzed based on the characteristics of power fluctuation of major renewable energy sources(wind power and photovoltaic).Taking wind power as an example,three electrical connection forms of DC,AC and AC/DC hybrid of the integrated structure containing wind power system are analyzed,and three charging station integration models containing wind power system are explored and summarized.On this basis,a wind power charging station system is constructed to meet the charging of certain electric vehicle users in residential areas,so as to realize the consumption of wind power by the charging load.Secondly,the charging load model of home electric vehicle charging station is established based on the characteristics of electric vehicle charging load in residential areas.For the wind power charging station in this paper,under the condition that the charging place and charging method of electric vehicles are fixed,the two main factors affecting the charging load of household electric vehicles are the starting charging moment and daily driving mileage through the analysis of the factors affecting the charging load of users.According to the statistical principle,the probability distribution of the two factors is established,and the Monte Carlo method is used to predict the charging load of different numbers of home electric vehicles.On this basis,the charging price can be considered to change the user charging time distribution,and the response model of the charging price of electric vehicle users is established as the basis for the subsequent study of the orderly charging of electric vehicles at wind power charging stations.Finally,a charging control strategy for electric vehicle charging stations based on wind power consumption is proposed.On the basis of comprehensive consideration of charging load demand and wind power output,a dynamic time-sharing tariff is formulated according to wind power fluctuation,and an orderly charging model for electric vehicles is established.The model is solved by an improved particle swarm optimization algorithm with the objectives of minimizing the peak-to-valley difference of the distribution network load including the EV charging load and minimizing the charging cost of users.The results show that the proposed control strategy is more conducive to wind power consumption,effectively reduces the impact of EV charging behavior on the distribution network,and improves the economics of charging users.27 figures,7 tables,72 references.