| Electric vehicle is a new energy vehicle with high energy efficiency,no mobile exhaust emission and low noise.However,in the current stage,the widespread use of electric vehicles is still greatly limited.From the perspective of users’ charging experience,on the one hand,the battery technology of electric vehicle is not perfect,the range of electric vehicle is generally short,many electric vehicle users have "range anxiety";on the other hand,due to the backward charging facilities,it is difficult for electric vehicles to supplement electric energy quickly and conveniently.In order to improve the charging experience of electric vehicle users,a variety of charging modes have been developed for users to choose.The construction of charging supporting facilities for various charging modes has been highly valued at home and abroad.However,for a long time in the future,the charging problem is still a key technical problem that limits the wide use of electric vehicles.From the perspective of power grid supply side,the increasing demand for electric vehicle charging also causes greater pressure on the power grid.Large scale disordered charging behavior will threaten the security and stability of power grid operation.Based on this,improving the charging experience under various charging modes and coordinating the load balance between charging load and power grid load are effective ways to speed up the large-scale popularization of electric vehicles.This paper focuses on charging route optimization strategy of electric vehicles under various charging modes.The main work is as follows:Firstly,this paper proposes a charging route optimization strategy for fast charging mode,taking real-time traffic information and power grid information into account.While coordinating the charging load and power grid load balance,it improves the charging experience of electric vehicle users,and provides users with a fast charging navigation strategy that can flexibly reduce charging cost and traveling time.The charging route optimization strategy for fast charging mode uses the fast charging power regulation scheme to avoid the overload of distribution network reducing the peak load of the power grid,and uses the fast charging price adjustment scheme to balance the fast charging demand of each rapid charging station reducing the waiting time of electric vehicle users and the operating pressure of the charging station.The proposed charging route optimization strategy for fast charging mode is simulated and compared with the shortest path charging navigation strategy.The total cost,time cost and charging cost of these two charging navigation strategies are compared under different weight coefficients in different time periods.The simulation results show that the proposed charging route optimization strategy can not only reduce the adverse effects of fast charging behavior on the power grid,but also provide electric vehicle users with a charging navigation strategy that can flexibly reduce the charging cost and traveling time according to different optimization objectives.Secondly,based on the rapid charging environment,combined with other charging modes including wireless charging mode,a charging environment system model with various charging modes is constructed,and a charging route optimization strategy under various charging modes is proposed.Ant colony algorithm is used to solve the charging route optimization problem.The proposed charging route optimization strategy under various charging modes is simulated and compared with other charging navigation strategy with single charging mode.The simulation results show that this charging route optimization strategy can flexibly select different charging modes,adjust the charging route and charging strategy,reduce the charging time or cost,optimize the charging planning of electric vehicles,and provide users with a more convenient and less cost charging route optimization strategy under various charging modes.The research of this paper can better coordinate the balance between fast charging load and power grid load to reduce the adverse effect of fast charging behavior on power grid.It also can help electric vehicle users to design appropriate charging strategies under various charging modes and improve their charging experience. |
