Control strategy for orderly charging of electric vehicles under a three-phase unbalanced distribution network

With the increasing utilization rate of electric vehicles in China, high permeability EVs make the three-phase imbalance rate of the urban distribution network increase day by day, which causes problems such as voltage fluctuation and network loss increase, and the distribution network with high three-phase imbalance rate also causes damage to the battery of EVs. An orderly charging control strategy for EVs in a three-phase unbalanced distribution network was presented. Firstly, by analyzing the reactive power supporting capacity of the EV charging inverter, there active power compensation mathematical model of EV under a three-phase unbalanced distribution network was established. Considering the operation of the distribution network and the charging needs of users comprehensively, the charging demands of EVs were classified on the urgency level, and an orderly charging ordering method of EVs based on the ideal solution method was established. Finally, through the simulation of a real three-phase unbalanced distribution network, the results show that this method can not only ensure the orderly charging of EVs, but also improve the voltage level of the distribution network, network loss, and three-phase unbalanced rate.