电器与能效管理技术 ›› 2024, Vol. 0 ›› Issue (4): 74-81.doi: 10.16628/j.cnki.2095-8188.2024.04.010

• 分布式电源及并网技术 • 上一篇    下一篇

V2G车网互联的双向AC/DC变换器直流阻抗模型及特性分析

张颖1, 伏睿1, 唐林权1, 荣高升2, 申亚波2   

  1. 1.国网新疆电力有限公司, 新疆 乌鲁木齐 830011
    2.国网新疆电力有限公司 经济技术研究院, 新疆 乌鲁木齐 830011
  • 收稿日期:2023-11-27 出版日期:2024-04-30 发布日期:2024-06-25
  • 作者简介:张 颖(1975—),女,工程师,主要从事配电网运检工作。|伏 睿(1983—),男,高级工程师,主要从事配电数字化研究工作。|唐林权(1987—),男,高级工程师,主要从事配电网规划设计研究工作。
  • 基金资助:
    国网新疆电力有限公司科技项目(SGXJJJ00JSJS2310042)

DC Impedance Modeling and Characteristic Analysis of Bidirectional AC/DC Converter for V2G System

ZHANG Ying1, FU Rui1, TANG Linquan1, RONG Gaosheng2, SHEN Yabo2   

  1. 1. State Grid Xingjiang Electric Power Supply Company, Urumqi 830011, China
    2. Ecomic and Technical Research Institute, State Grid Xinjiang Electric Power Co., Ltd., Urumqi 830011, China
  • Received:2023-11-27 Online:2024-04-30 Published:2024-06-25

摘要:

双向AC/DC变换器的控制及直流输出阻抗是电动汽车充电桩并网运行及稳定性分析的关键。首先,提出含直流下垂环节的虚拟同步电机(VSM)控制策略,并利用上层功率指令实现双向AC/DC变换器直流电压的无差调节。然后,建立VSM功率控制环小信号模型,分析有功功率传输、有功功率指令与直流电压间的交互作用及影响。接着,建立双向AC/DC变换器在直流下垂VSM控制策略下的直流输出阻抗模型,详细分析阻尼系数、惯性系数、直流侧电容、传输功率、直流下垂系数等关键参数对直流输出阻抗的影响。最后,通过仿真及阻抗测量验证了所提直流下垂VSM控制策略的有效性和阻抗模型的正确性。

关键词: 双向AC/DC变换器, 直流下垂VSM控制, 小信号阻抗模型, 阻抗测量

Abstract:

The control of bidirectional AC/DC converters and the DC output impedance are crucial for the grid connected operation and stability analysis of electric vehicle charging stations. First, the virtual synchronous motor(VSM) control strategy with DC droop link is proposed, and the upper-level power command is used to realize the non-differential regulation for DC voltage of the bidirectional AC/DC converter. Then, a small signal model of the VSM power loop is established to analyze the interaction and influence between active power transmission, active power command and DC voltage. Furthermore, the DC output impedance model of the bidirectional AC/DC converter controlled by the DC droop VSM is established, and the influence of key parameters such as damping and inertia coefficient, DC side capacitance, transmission power, and DC droop coefficient on the DC output impedance is further analyzed in detail. Finally, the simulation result and impedance measurement verify the effectiveness and correctness of DC droop VSM control strategy and the proposed impedance model.

Key words: bidirectional AC/DC converter, DC droop VSM control, small signal model, impedance measurement

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