Research On Optimized Charging Strategy Of Electric Bus Based On Wind Power Consumption

In recent years,as the increasing popularization of electrification in public transportation in China,many cities across the country have gradually achieved the goal of electrification of urban buses.A reasonable,efficient and low-carbon electric bus charging station operation mode has become an important guarantee of the development of electric buses.China has a vast territory and sufficient wind energy resources.The establishment of distributed wind farms is conducive to the development and utilization of wind energy resources.Promoting the local consumption of wind power can save transmission costs and improve economy.In this paper,this article focuses on the business cooperation mode between wind power companies and electric bus charging stations,and conducts research on charging strategies.The paper takes the electric bus charging station located near the decentralized wind farm as the research object,and proposes an optimized charging strategy in order to improve the operation mode of the charging station.First,a research on electric vehicle charging technology is conducted.The charging process of the lithium battery is analyzed and the process of power charging can be simplified as a constant process.The impact of the number of charging piles on charging costs is discussed.The charging rule model is established on base of model assumptions of the charging strategy.Then a bilevel programming charging strategy is proposed.The business cooperation model and process of the cooperative operation between the charging station and the wind farm under this strategy are given.The bilevel programming charging strategy with the optimization goal of the lowest daily charging cost and the highest completion of the charging plan is established.In order to solve this bilevel programming problem,a joint solution method using improved particle swarm optimization and CPLEX solver is proposed.Finally,a two-stage optimization charging strategy based on MPC is proposed.The obtained charging power matrix is used as the reference value for the intraday rolling optimization,and the second stage optimization model is established with the goal of optimizing the lowest charging cost and the smallest charging power deviation in the time domain.To solve the second stage optimization model,a rolling optimization is carried out according to the update of intraday wind power.The simulation results show that the two-stage optimized charging strategy proposed in this article can reasonably allocate the charging power of each vehicle,so that the charging plan of each vehicle is highly completed.Compared with disordered charging and bilevel programming charging,the two-stage optimized charging strategy can improve the operating economics of electric bus charging stations and increase the local consumption rate of wind power.Therefore,a win-win cooperation mode between bus companies and wind power companies is achieving.