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Two-port equivalent circuit model for UHVDC converter valves

机译：特高压直流换流阀的两端口等效电路模型

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摘要

UHVDC converter valves during operation may experience overvoltage, which come from the AC or DC systems to which they are connected. Therefore, building an equivalent circuit model (ECM) for the converter valve to analyze the interlayer transient voltage distribution characteristics has important engineering significance for safe and reasonable voltage equalization methods and improving the stability of the DC system. This paper proposes a two-port equivalent circuit model for +/- 1100 kV converter valve based on the structure of the valve and parameter extraction methods presented. In terms of lumped parameters, integrated ECMs for valve layers are built through impedance-frequency characteristic analysis; in terms of parasitic capacitance parameters, port equivalent parasitic capacitance parameters are obtained by terminal capacitance method and iterative equivalence methods proposed in this paper. By combining integrated ECMs of valve layers and port equivalent parasitic capacitances, the two-port ECM is obtained. Simulations are carried out to test the effectiveness of the two-port ECM. Using the ECM, the voltage transmission characteristics and their influencing factors are analyzed, depending on which corresponding voltage equalization method is proposed in this paper, and the effect of this method is verified through simulation.
机译：UHVDC换流阀在运行过程中可能会遭受过电压，该过电压可能来自与其连接的交流或直流系统。因此，为换流阀建立等效电路模型（ECM），分析层间瞬态电压分布特性，对于安全合理的均压方法和提高直流系统的稳定性具有重要的工程意义。本文基于阀的结构和提出的参数提取方法，提出了+/- 1100 kV换流阀的两端口等效电路模型。在集总参数方面，通过阻抗-频率特性分析建立了用于阀层的集成ECM。在寄生电容参数方面，本文采用端接电容法和迭代等效法求出了端口等效寄生电容参数。通过结合阀层的集成ECM和端口等效寄生电容，可以获得两端口ECM。进行仿真以测试两端口ECM的有效性。利用ECM，分析了电压传输特性及其影响因素，根据本文提出的相应电压均衡方法，通过仿真验证了该方法的有效性。

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  • 来源
    《Power and Energy Systems, CSEE Journal of》 |2019年第1期|100-110|共11页
  • 作者

    Chen Ning; Qi Lei; Tang Yi; Zhao Cuiyu; Cui Xiang; Gao Chong;

  • 作者单位

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China;

    State Grid Hefei Power Supply Co, Hefei 230022, Anhui, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China;

    Global Energy Interconnect Res Inst, Beijing 100192, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Equivalent circuit model; parasitic capacitance; UHVDC converter valve; voltage equalization method;

    机译：等效电路模型;寄生电容;UHVDC转换器阀;电压均衡方法;

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