Research On Charging Load Characteristics Of Electric Vehicles And Carrying Capacity Of Distribution Network In Residential Areas

Because traditional fuel vehicles have aggravated environmental pollution and energy shortages,electric vehicles have gradually entered the market of traditional fuel vehicles because of their advantages of using clean energy,and have been widely used.However,the problem that comes with it is that the original power grid will change significantly in different aspects such as load curve,operation scheduling and even initial planning of the power grid due to the access of large-scale electric vehicles,and the distribution network is directly connected to the charging of electric vehicles.The group has been particularly affected by the impact.In response to this dilemma,this paper has determined the research ideas,that is,focusing on the charging characteristics of electric vehicles and the impact of different scales of electric vehicle charging groups on the carrying capacity of distribution networks.The on-site monitoring of the electrical load of the distribution network of Jiangshan Fenghua Community in Yichang City was carried out,and the residential electricity load and the comprehensive power load were compared in the region,and their respective load characteristics were analyzed in detail.Then through the further analysis of the factors affecting the charging load of electric vehicles,a calculation method based on statistical model for charging load of electric vehicles is proposed.The simulation results show that the charging load curves of electric vehicle charging groups of different scales have different fluctuation characteristics.Moreover,this paper adopts two parameters of charging load simultaneous rate and mutual contemporaneity rate to determine the relationship between the peak value of electric vehicle charging load and the peak value of grid background load,and then charge electric vehicles with different charging methods and different charging numbers.The curve of the simultaneous rate of load and the mutual simultaneous rate are studied in depth.Based on the analysis of residential electricity load and electric vehicle charging load characteristics,based on the radiation distribution network model,an improved model of electric vehicle charging load carrying capacity based on mathematical analysis method is established.At the same time,a practical evaluation method for the carrying capacity of the residential distribution network for charging electric vehicles is given.In this paper,the evaluation of the load carrying capacity of the distribution network and the analysis of thechange law of the charging load curve for the charging of electric vehicles provide a constructive reference for the charging mode of electric vehicles and the corresponding transformation of the distribution network.