电动汽车充放电特性及其对配电系统的影响分析

随着电动汽车技术特别是电池技术的发展和一些发达国家在政策方面的大力支持,电动汽车在最近几年得到快速发展.大量电动汽车的广泛应用肯定会对电力系统尤其是配电系统产生影响,因此就很有必要研究电动汽车充电时的需求特性和电动汽车接入网络(Vehicle to Grid,V2G)时的放电容量曲线.在此背景下,采用蒙特卡洛仿真方法首...

Charging and discharging characteristics of electric vehicles as well as their impacts on distribution systems

With the policy support in developed countries and advances in electric vehicle technologies,especially high energy and power density batteries,the penetration level of electric vehicles(EV) in a power system associated is expected to grow rapidly.The large-scale deployment of electric vehicles will have significant impacts on the power system,especially the distribution system associated.The Monte Carlo simulation method is first utilized to study the charging load in the uncoordinated charging mode and the discharging capacity curve in the vehicle-to-grid(V2G) mode.Then,the impacts in terms of the load profile,power losses and voltage deviations are analyzed in both the uncoordinated charging mode and the V2G mode.Finally,the PG&E 69-node distribution system is employed to study the charging and discharging impacts on this system from aspects such as the load profile,power losses,voltage deviations under several EV penetration level scenarios.Simulation results indicate that the uncoordinated charging at a high EV penetration level will pose great pressures on the distribution system and that reasonable management of the charging and discharging of EVs will be helpful for improving the secure and economic operation of the distribution system.