电动汽车的多点接入对区域电网的稳定性影响

The Impact of Electric Vehicles on the Stability of Regional Power Grids

摘要: 本文基于PSASP仿真系统，以新英格兰10机39节点网络为仿真网络，研究了电动汽车接入模式对电网运行特性的影响，计算了电网中三个接入点单独、两两以及三条母线等接入模式下，网络中的负荷、电压偏移率、初始/极限点参与因子、线路裕度的变化。研究发现，当多母线同时有EV接入时，系统的负荷峰谷差可降低8.3%，电压偏移率会增至1.2205%，其电压初始点参与因子会增加，而极限点参与因子有增加也有减少，线路稳定裕度最大可降低3.33%。上述结果表明，电动汽车的合理接入对电力系统的日负荷曲线具有平抑作用，电网的薄弱母线会随负荷变化而改变。

Abstract: This paper is based on the PSASP simulation system, using New England 10-machine 39-node network as the simulation network, analyzes the impact of the electric vehicle (EV) access mode on the system operating characteristics, and calculates the load, voltage offset, initial/limit point participation factor and line margin change under three access points, such as the three access points alone, two or two, and three buses in the power grid. The study found that when multiple buses are connected to an electric vehicle at the same time, the peak-to-valley load difference of the power grid can be reduced by 8.3%, the voltage offset rate can increase to 1.2205%, and the voltage initial point participation factor increases, while the limit point participation factor increases. With the reduction, the line stability margin can be reduced by a maximum of 3.33%. The above results show that the reasonable access of the electric vehicle has a deterrent effect on the daily load curve of the power system, and the weak bus of the power grid will change with the load change.