三相不平衡配网下电动汽车有序充电控制策略

Orderly Charging Control Strategy for Electric Vehicles in Three-phase Unbalanced Distribution Network

随着我国电动汽车使用率的逐年攀升,高渗透率电动汽车使得城市配电网的三相不平衡率日益升高,造成配网电压波动和网损增大等问题,同时,高三相不平衡率的配网也会对电动汽车电池造成损害。提出了一种三相不平衡配电网下电动汽车有序充电控制策略。首先,通过分析电动汽车充电逆变器的无功支撑能力,建立了三相不平衡配电网下电动汽车无功补偿数学模型。在全面考虑配网运行和用户充电需求下,对电动汽车充电需求进行紧迫度分级,建立了基于理想解法的电动汽车有序充电排序方法。最后,通过某真实三相不平衡配电网的仿真验证,结果表明,该方法既能保证电动汽车的有序充电,同时还可以改善配电网的电压水平、网络损耗以及三相不平衡率等。

With the increasing utilization rate of electric vehicles(EVs)in China,high permeability EVs make the three-phase imbalance rate of 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 EV in three-phase unbalanced distribution network was presented.Firstly,by analyzing the reactive power supporting capacity of EV charging inverter,the reactive power compensation mathematical model of EV under three-phase unbalanced distribution network was established.Considering the operation of the distribution network and the charging needs of users in a comprehensive way,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 EV,but also improve the voltage level of the distribution network,network loss and three-phase unbalanced rate.