Research On Charging Guidance Strategy Of Electric Vehicles Considering The Operation Safety Of Distribution Networ

While fuel vehicles bring convenience to people’s lives,they also exacerbate the problems of environmental pollution and energy crisis.With the increasing attention to environmental issues,electric vehicles have been vigorously developed globally due to the advantages of environmental protection and energy conservation.However,the widespread use of large-scale electric vehicles will bring new challenges to the safety of urban transportation and distribution network operation.On the one hand,the irregular travel habits of electric vehicle users and the difficulty in obtaining charging station information will increase their travel costs;On the other hand,due to the impact of endurance,electric vehicles traveling on the way are prone to situations where they need to go to fast charging stations for emergency charging due to insufficient battery capacity.The integration of large-scale electric vehicle charging loads can pose hidden dangers to the safety of distribution network operation.Therefore,considering the safety issues of distribution network operation is of great significance for charging planning of electric vehicles during travel.This article proposes a travel electric vehicle charging guidance strategy that considers the safe operation of the distribution network,the operation status of charging stations,and the charging needs of electric vehicles.The main work is as follows:Firstly,based on the characteristics of the urban road network and distribution network,the interaction relationship between charging stations,transportation networks,and distribution networks was analyzed;Briefly introduced the basic situation of electric vehicles,and established traffic network models and distribution network models;Then,a coupling model of "electric vehicle charging station transportation network distribution network" was established based on the correlation of each part.Secondly,in response to the problem of increasing peak valley load differences and severe node voltage drop caused by large-scale charging behavior of electric vehicles,a pricing model for time-of-use electricity prices in different regions considering the safety of distribution network operation is proposed.The correlation between electricity prices and distribution network operation is established,hoping to change the charging station selection and charging behavior of electric vehicles through the established electricity prices,In order to reduce the impact of disorderly charging of electric vehicles on the safety of distribution network operation.Once again,based on the pricing model of time-of-use electricity prices in different regions,a charging guidance model for travel electric vehicles considering the safety of distribution network operation is proposed.The model is divided into two parts: an orderly charging scheduling model for electric vehicles and a charging station selection model.This article uses an orderly charging scheduling model for electric vehicles to calculate the charging cost of electric vehicles at each charging station,and takes this charging cost as a preliminary condition.The charging station selection model is used to select the charging station and plan the optimal driving path.Finally,taking the modified IEEE 33 node distribution network and the established "charging station transportation network distribution network" coupling model as examples,the travel charging simulation of electric vehicles was conducted and the calculation results were analyzed.The results indicate that optimizing the travel goals of electric vehicles through electricity price incentives can not only improve the travel data of electric vehicles,but also reduce the adverse impact of large-scale charging behavior of electric vehicles on the operation safety of the distribution network.