Electric Vehicle Charger Current Analysis Model under Unbalanced Voltage
Wang Jinhao1, Li Shengwen1, Chang Xiao1, Yang Chaoying1, Xu Shaobo2
1. State Grid Shanxi Electric Power Research Institute Taiyuan 030001 China; 2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
Abstract：In the process of grid operation, unbalanced three-phase load, asymmetric line parameters and asymmetric fault may cause unbalanced three-phase voltage. With the influence of unbalanced voltage component, the input current of electric vehicle charger has different operation modes, including completely discontinuous state, completely continuous state and intermediate mixed state. In order to accurately and comprehensively describe the input current characteristics of the electric vehicle charger under the condition of voltage imbalance, according to the difference of three-phase current state, a method of operating state division covering all operating conditions of the charger is proposed. Considering the influence of unbalanced voltage component and harmonic component, the current analysis models of charger in different modes, including passive power factor correction section, line equivalent impedance and AC filter inductance, are established respectively. By comparing the theoretical calculation waveform of the proposed model with the measurement results of physical experiments, the validity of the proposed modal division method and the accuracy of the proposed model are verified.
王金浩, 李胜文, 常潇, 杨超颖, 徐少博. 电压不平衡条件下电动汽车充电机电流分析模型[J]. 电工技术学报, 2021, 36(zk2): 582-590.
Wang Jinhao, Li Shengwen, Chang Xiao, Yang Chaoying, Xu Shaobo. Electric Vehicle Charger Current Analysis Model under Unbalanced Voltage. Transactions of China Electrotechnical Society, 2021, 36(zk2): 582-590.
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2021, Vol. 36 
