中国电力 ›› 2021, Vol. 54 ›› Issue (10): 63-71.DOI: 10.11930/j.issn.1004-9649.202001102

• 国家“十三五”智能电网重大专项专栏:(八)直流电网故障电流抑制技术专栏 • 上一篇    下一篇

±1100 kV特高压直流换流站PCOV计算及影响因素分析

马江江1, 齐磊1, 朱毅2   

  1. 1. 新能源电力系统国家重点实验室(华北电力大学),北京 102206;
    2. 国网山东省电力公司经济技术研究院,山东 济南 250021
  • 收稿日期:2020-01-19 修回日期:2020-07-13 出版日期:2021-10-05 发布日期:2021-10-16
  • 作者简介:马江江(1994-),男,硕士研究生,从事电力系统先进输电技术研究,E-mail:majiangjlw@163.com;齐磊(1978-),男,通信作者,教授,博士生导师,从事先进输电技术及装备、电力系统电磁兼容等研究,E-mail:qilei@ncepu.edu.cn;朱毅(1978-),男,硕士,高级工程师,从事电网规划设计研究工作,E-mail:70337421@qq.com
  • 基金资助:
    国家电网有限公司科技项目(特高压直流换流站主设备高频建模及其应用,SGTYHT/17-JS-199)

Calculation and Influencing Factor Analysis of PCOV in ±1 100 kV UHVDC Converter Station

MA Jiangjiang1, QI Lei1, ZHU Yi2   

  1. 1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China;
    2. State Grid Shandong Economics and Technology Research Institute, Jinan 250021, China
  • Received:2020-01-19 Revised:2020-07-13 Online:2021-10-05 Published:2021-10-16
  • Supported by:
    This work is supported by Science and Technology Project of SGCC (High Frequency Modeling and Application of Main Equipment in UHVDC Converter Station, No.SGTYHT/17-JS-199)

摘要: 含换相过冲的持续运行电压峰值(peak value of the continuous operating voltage, PCOV)是决定换流站直流避雷器参考电压的一个重要参数。针对昌吉—古泉±1100 kV特高压直流工程建立了换流阀、换流变压器、平波电抗器、PLC滤波器等主设备模型,基于±1100 kV特高压换流站系统等效电路模型仿真计算了各类型直流避雷器的PCOV水平。对比公式法计算结果,PCOV水平整体上一致,最大偏差为13.4%,说明公式法计算值仍留有一定的安全裕度。基于所建立的模型进一步对PCOV计算的影响因素进行分析,结果表明,换流阀的阻尼电阻、阻尼电容、饱和电抗器铁芯电感、换流变压器漏感和平波电抗器电感对PCOV计算的影响较大。

关键词: 特高压直流, 换相过冲, 持续运行电压峰值, 直流避雷器

Abstract: The peak value of the continuous operating voltage including commutation overshoot is an important parameter that determines the reference voltage of the DC arrester in the converter station. Based on the Changji-Guquan ±1100 kV UHVDC project, the models of main equipment including converter valve, converter transformer, flat wave reactor and PLC filter are established. The PCOV level of each type of DC arrester is simulated according to the equivalent circuit model of the ±1100 kV UHVDC converter station. Compared with the results calculated by the formula method, the simulated PCOV level is consistent on the whole, with the maximum deviation of 13.4%, indicating that the formula method still has a certain safety margin. Based on the models established in this paper, the influencing factors of PCOV are further analyzed, and the results show that the damping resistance, damping capacitance, the iron inductance of the saturated reactor, the leakage inductance of the converter transformer and the inductance of flat-wave reactor have a great influence on PCOV calculation.

Key words: UHVDC, commutation overshoot, peak value of the continuous operating voltage(PCOV), DC arrester