Study On Rapid Charging Characteristics Of Large Scale Electric Vehicle Cluster

With the rapid application of electric vehicle charging technology,the rapid charging of electric vehicles will become the mainstream direction of future development.Because the power of fast charging exceeds the one of conventional charging,the load change by fast charging may exacerbate the load peak valley difference,and lead the distribution network line overload and voltage sag.In the same time,it will cause the increase of the distribution network loss.So it is necessary to research the power of large-scale cluster electric vehicle fast charging and the regularity of charging characteristics.And theoretical support for the optimization design of electric vehicle charging station network is provided.In this paper,first of all,the analysis to the electric vehicle facilities charging status of the construction and development,fast charging characteristics and power battery technology of electric vehicle are studied.Combining with the intelligent charging service network planning,electric vehicle fast charging scenarios are set up,and the forecast to the development trend of electric vehicle battery and fast charging is presented.In the second place,the battery charging curve,ideal multi-stage charging mode and fast charging method are studied,the fast charging curve of lead-acid batteries and lithium batteries are established,different types of single electric vehicle charging simplified models are constructed,and the probability distribution of electric vehicle charging is put forward.At last,fast charging load characteristics of large-scale electric vehicle cluste is studied based on a single model of electric vehicle charging,several charging probability parameters are proposed.Hierarchical classification of electric vehicles is presented by AHP,large-scale electric vehicle fast charging model is established.And the large-scale electric vehicle cluster simulation for the charging load characteristics by Monte Carlo.