Research On Fast Charging Station Operation And Compensation Equipment Constant Capacity Strategy Under Different Load Permeability

As an important part of new energy development strategy in my country,electric vehicles are rapidly occupying the market and are expected to become the main direction of the future development of the automobile industry.With the continuous development and popularization of electric vehicles,the charging demand of users will also continue to increase.The accelerated pace of urban life has made fast charging more and more popular among urban electric vehicle users,which has led to a rapid increase in the demand for fast charging among electric vehicle users.At the same time,the formation of an urban fast charging network based on fast charging piles and fast charging stations(hereinafter referred to as fast charging stations)has further accelerated the popularization of fast charging methods.Existing studies have shown that a large number of electric vehicles clustered in fast charging stations will cause many power quality problems in the distribution network,such as increased node voltage deviation and reduced power supply quality,which will seriously affect the safety of the distribution network.The economic and stable operation of the station has a negative impact.In order to reduce these adverse effects,improve the stability and economy of fast charging station operation,and reduce the impact and pollution on the power quality of the distribution network nodes,study the load fluctuation characteristics of fast charging stations and formulate reasonable fast charging stations to optimize operation The strategy has great practical significance.To this end,this paper takes the fast charging station as the research object,and does a more in-depth study on the two key issues of fast charging station operation and compensation equipment constant capacity under different load penetration rates.The contents are as follows:First,based on the load modeling of electric vehicle charging at fast charging stations,the changes in the node voltage level of fast charging stations under different fast charging load penetration rates are analyzed,which provides a reference for the fast charging stations to propose reasonable optimization strategies.Then,in view of the problems such as the drop in voltage quality of distribution network nodes and the limited operation of fast charging stations caused by the large-scale fast charging of fast charging stations,from the perspective of fast charging station operation and compensation equipment application,consider the penetration rate of fast charging station nodes.The influence of the voltage level,the fast charging station operation and compensation equipment constant capacity strategy under different load penetration rates are proposed.For fast charging stations with lower load penetration rate,on the premise of not adding additional compensation equipment,an optimization strategy for multi-station joint operation is proposed.For fast charging stations with higher and high load penetration rates,appropriate compensation equipment is put into operation.To improve the voltage quality and improve the operating level.Finally,taking the charging scenarios of urban fast charging stations under three typical penetration rates as examples,simulation verification and analysis of the proposed optimization strategy are carried out.The results show that the optimization strategy can effectively improve the voltage quality of the fast charging station node in the corresponding scenario to be optimized,reduce the adverse impact on the operation of the fast charging station,and improve the economic efficiency of the fast charging station operation to a certain extent.