中国电力 ›› 2022, Vol. 55 ›› Issue (5): 84-93.DOI: 10.11930/j.issn.1004-9649.202107017

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计及电压测量特性的MMC中高频阻抗建模及稳定性分析

李奇南1,2, 夏勇军3, 张晓林1,2, 孙宝奎1,2, 孙华东4, 张帆1,2, 李兰芳1,5, 杨岳峰1,2, 韩情涛6   

  1. 1. 南瑞集团(国网电力科学研究院)有限公司, 江苏 南京 211106;
    2. 北京市直流输配电工程技术研究中心(中电普瑞电力工程有限公司), 北京 102200;
    3. 国网湖北省电力有限公司电力科学研究院, 湖北 武汉 430061;
    4. 中国电力科学研究院有限公司, 北京 100192;
    5. 中电普瑞科技有限公司, 北京 102200;
    6. 国网湖北省电力有限公司直流运检公司, 湖北 宜昌 443001
  • 收稿日期:2021-07-06 修回日期:2021-10-27 出版日期:2022-05-28 发布日期:2022-05-18
  • 作者简介:李奇南(1981—),男,博士,工程师,从事柔性交、直流输电以及新能源并网研究,E-mail:liqinan@sgepri.sgcc.com.cn
  • 基金资助:
    国家电网有限公司科技项目(VSC/LCC直流并联混合多馈的近区电网动态功率协调控制研究,5100-202022011A-0-0-00 )。

Medium-High Frequency Impedance Modeling of MMC and System Stability Analysis Considering Voltage Measurement Characteristics

LI Qinan1,2, XIA Yongjun3, ZHANG Xiaolin1,2, SUN Baokui1,2, SUN Huadong4, ZHANG Fan1,2, LI Lanfang1,5, YANG Yuefeng1,2, HAN Qingtao6   

  1. 1. NARI Group Corporation (State Grid Electric Power Research Institute) Co., Ltd., Nanjing 211006, China;
    2. Beijing DC Transmission and Distribution Engineering Technology Research Center (China-EPRI Electrical Engineering Co., Ltd.), Beijing 102200, China;
    3. Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430061, China;
    4. China Electric Power Research Institute, Beijing 100192, China;
    5. China EPRI Science & Technology Co., Ltd., Beijing 102200, China;
    6. State Grid Hubei DC Inspection Company, Yichang 443001, China
  • Received:2021-07-06 Revised:2021-10-27 Online:2022-05-28 Published:2022-05-18
  • Supported by:
    This work is supported by Science and Technology Project of SGCC (Research on Dynamic Power Coordination Control of VSC/LCC HVDC Parallel System and Near Area Power Grid, No.5100-202022011A-0-0-00)

摘要: 在建立MMC阻抗模型时,现有研究未计及电容式电压互感器(CVT)测量特性对MMC阻抗中、高频段的影响,可能会降低柔性直流输电系统稳定性分析的准确度。以渝鄂柔直工程南通道单元为研究对象,在分析杂散电容对500 kV速饱和型CVT测量特性影响的基础上,基于多谐波线性化原理提出了一种计及CVT宽频测量特性的MMC阻抗模型建立方法。采用阻抗分析法分析当柔直换流站接入不同交流系统、运行于不同稳态工作点时,CVT宽频测量特性对柔直系统稳定性的影响。分析结果表明,在某些场景下CVT宽频测量特性将导致系统的振荡频率发生变化。通过电磁暂态时域仿真,验证了所提出的计及CVT宽频测量特性的MMC阻抗模型可提高柔直系统稳定性分析的准确度。

关键词: 模块化多电平换流器, 谐波线性化, 阻抗, CVT, 宽频测量特性

Abstract: In MMC impedance modelling, the existing research does not take into account the influence of the capacitive voltage transformer (CVT) measurement characteristics on the mid and high frequency bands of the MMC impedance, which may reduce the accuracy of the stability analysis of the flexible HVDC transmission system. By taking the south channel unit of the Yu’E flexible HVDC project as the research object, and based on an analysis of the influence of stray capacitance on the measurement characteristics of a 500kV fast saturated CVT, a MMC impedance modelling method is proposed using the multi-harmonic linearization method. The impedance analysis method is used to analyze the influence of the CVT broadband measurement characteristics on the stability of the HVDC system when the MMC station is connected to different AC systems and operates at different steady-state operating points. The results show that the CVT broadband measurement characteristics will cause the oscillation frequency of the system to change under certain working conditions. Through PSCAD/EMTTDC simulation, it is verified that the proposed MMC impedance model, which takes into account the CVT broadband measurement characteristics, can improve the accuracy of the stability analysis of the flexible HVDC system.

Key words: modular multilevel converter (MMC), multi-harmonic linearization, impedance, CVT, broadband measurement characteristics