Research on characteristics of electric vehicle charging load and distribution network supportability

As the electric vehicle(EV)charging is playing an important role in distribution network, it has attracted more and more attention. In order to clarify the relationship between the operation mode of EVs, peak charging load and peak power load of grid, this paper defines two key parameters: coincidence factor and mutual coincidence factor. The variation tendencies of these two parameters under different EVs scale and charging rate are also analyzed. Based on the characteristics of EV charging load and the power load of distribution network in residential area, an evaluation method for distribution network supportability is proposed. Finally effectiveness of the evaluation method are verified by distribution network in residential area. The results show that by choosing the capacity of transformer properly, the ability of the distribution network for the integration of EV can be greatly improved.