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UHVDC接地极线路短路阻抗特性及阻抗监视系统死区研究
作者:
作者单位:

1.国网四川省电力公司电力科学研究院,四川省成都市 610072;2.输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市 400044

摘要:

针对现有特高压直流接地极线路阻抗监视系统(简称阻抗监视系统)存在的拒动问题,从理论上推导了接地极线路在不同短路故障条件下的故障阻抗表达式,并验证了理论推导的正确性。在获得故障阻抗表达式的基础上,考虑不同过渡电阻、故障距离和接地极线路长度的影响,研究了接地极线路故障阻抗和正常运行时阻抗的差异规律,分析了阻抗监视系统在不同故障条件下的适应性,阐述了阻抗监视系统的拒动机理。研究结果表明,现有阻抗监视系统存在保护死区,难以正确反映高阻、远距离故障,特别是当接地极线路的长度为注入信号线模半波长的整数倍时,若单回线故障距离为注入信号四分之一线模波长的奇数倍时,阻抗监视系统将发生拒动。

关键词:

基金项目:

国家自然科学基金资助项目(51707019)。

通信作者:

作者简介:

李小鹏(1987—),男,通信作者,博士,高级工程师,主要研究方向:高压直流输电线路控制与保护。E-mail:lxpbsd@163.com
庄祎(1995—),男,硕士研究生,主要研究方向:高压直流接地极线路保护。E-mail:zhuangyi@cqu.edu.cn
卢继平(1960—),男,博士,教授,主要研究方向:电力系统继电保护。E-mail:lujiping@cqu.edu.cn


Research on Short-circuit Impedance Characteristic and Dead-zone of Supervision System for UHVDC Grounding Electrode Line
Author:
Affiliation:

1.Electric Power Research Institute of State Grid Sichuan Electric Power Company, Chengdu 610072, China;2.State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University), Chongqing 400044, China

Abstract:

Aiming at the problem of failing to operate of the existing ultra-high voltage direct current (UHVDC) grounding electrode line impedance supervision (ELIS for short) system, the fault impedance expression under different short-circuit fault conditions of the grounding electrode line is theoretically derived, and the correctness of the theoretical derivation is verified as well. Based on the fault impedance expression, taking the effects of different transition resistances, fault distances and grounding line lengths into account, the law of impedance differences between fault impedance and the normal operation impedance of the grounding electrode line is studied. The adaptability of ELIS system is also analyzed under different fault conditions, and the mechanism of failing to operate of ELIS system is explained. The research results show that the existing ELIS system has a protection dead zone, and it is difficult to correctly detect the faults with high resistance and long distance. In particular, while the length of the grounding electrode line is an integer multiple of the half wavelength for the injected signal in aerial mode, and the single-line fault distance is an odd multiple of the quarter-wavelength for the injected signal in aerial mode, the ELIS system will fail to operate.

Keywords:

Foundation:
This work is supported by National Natural Science Foundation of China (No. 51707019) and State Grid Sichuan Electric Power Company (No. 521997200003).
引用本文
[1]李小鹏,庄祎,卢继平,等. UHVDC接地极线路短路阻抗特性及阻抗监视系统死区研究[J].电力系统自动化,2020,44(22):70-77. DOI:10.7500/AEPS20191025008.
LI Xiaopeng, ZHUANG Yi, LU Jiping, et al. Research on Short-circuit Impedance Characteristic and Dead-zone of Supervision System for UHVDC Grounding Electrode Line[J]. Automation of Electric Power Systems, 2020, 44(22):70-77. DOI:10.7500/AEPS20191025008.
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  • 收稿日期:2019-10-25
  • 最后修改日期:2020-02-23
  • 录用日期:
  • 在线发布日期: 2020-11-18
  • 出版日期:
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