| 引用本文: | 赵 伟,姜 飞,涂春鸣,肖 勇,孟金岭,肖 凡.电动汽车充电站入网谐波分析[J].电力自动化设备,2014,34(11): |
| ZHAO Wei,JIANG Fei,TU Chunming,XIAO Yong,MENG Jinling,XIAO Fan.Harmonic currents of grid-connected EV charging station[J].Electric Power Automation Equipment,2014,34(11): |
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| 摘要: |
| 为了研究电动汽车充电站产生的谐波电流对电网的影响，建立了单台三相不可控整流充电机模型，分析了多台充电机的谐波特征。分析结果表明，谐波治理装置对电动汽车充电站产生的25次及以上的谐波的治理效果并不明显，这些谐波电流流入电网后会产生谐波放大现象。因此，通过建立配电网谐波潮流模型和输电线路谐波阻抗精确模型，给出谐波电流放大倍数计算公式。利用理论分析结果和谐波电流放大倍数计算公式，分析电动汽车充电站对系统各节点的电流和电压的影响。对IEEE 14节点系统进行算例分析，结果表明：节点与谐波源的电气距离越近，节点电压变化越大；电动汽车充电机产生的高次谐波流入电网后，存在明显的放大现象，应予以重视。 |
| 关键词: 电动汽车 充电站 谐波电流 谐波电压 谐波分析 模型 |
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| Harmonic currents of grid-connected EV charging station |
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ZHAO Wei1, JIANG Fei2, TU Chunming2, XIAO Yong1, MENG Jinling1, XIAO Fan2
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1.Electric Power Research Institute of Guangdong Power Grid Corporation，Guangzhou 510080，China;2.College of Electrical & Information Engineering，Hunan University，Changsha 410082，China
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| Abstract: |
| An uncontrollable three-phase rectifier charger model is built and the harmonic characteristics of various EV chargers are studied for analyzing the influence of harmonic currents produced by EV（Electric Vehicle） charging station on the electric power grid. The analytical results show that，the 25th- and above- order harmonic currents cannot be well suppressed by the harmonic suppression devices and will be enlarged in power grid. A harmonic power flow model of power distribution system and a precise harmonic-impedance model of transmission line are established to deduce the calculating formula of harmonic magnification. The influences of EV charging station on the currents and voltages of different grid nodes are analyzed. The case study for IEEE 14-bus system demonstrates that，the shorter the electrical distance between node and harmonic source is，the greater the node voltage change is；the high-order harmonic currents of EV charging station are obviously enlarged after flowing into power grid. |
| Key words: electric vehicles charging station harmonic current harmonic voltage harmonic analysis models |
