An impact analysis of large-scale electric vehicle charging on reliability of small-regional distribution network

Abstract：Large-scale access of electric vehicle to distribution network has become a trend, and electric vehicle on-board charging technology has also been widely used.The impact of electric vehicles with on-board charging on the reliability of district distribution network under high permeability access conditions was analyzed.Firstly, according to the main technical parameters of electric vehicle charger and the composition of district distribution network, the model of vehicle charger and district distribution network was built in PSCAD environment.Secondly, according to the charging time distribution of the electric vehicle, the load changes of the district distribution network under the two charging modes of the disorderly charging and the orderly charging of the electric vehicle were analyzed, and it was concluded that the orderly charging could better achieve the peak load cutting and valley load filling of the district distribution network.Finally, the IEEE RBTS-BUS6 test system was used to quantify the reliability index of the electric vehicle load access point, charging mode and permeability.The results showed that line overload was the main limiting factor for large-scale access system of EV.Increasing the capacity of access point and adopting orderly charging mode could effectively improve the reliability of district distribution network.

Keyword：electric vehicle;reliability of distribution network;charging mode;