华南理工大学学报(自然科学版) ›› 2016, Vol. 44 ›› Issue (11): 119-125.doi: 10.3969/j.issn.1000-565X.2016.11.018

• 动力与电气工程 • 上一篇    下一篇

雷击工况下UHVDC 线路行波保护误动概率模型与风险评估

蔡泽祥1 梁益1 田得良1 李晓华1 李书勇2   

  1. 1. 华南理工大学 电力学院,广东 广州 510640; 2. 中国南方电网科学研究院有限责任公司,广东 广州 510080
  • 收稿日期:2016-05-06 修回日期:2016-05-15 出版日期:2016-11-25 发布日期:2016-10-04
  • 通信作者: 蔡泽祥( 1960-) ,男,教授,博士生导师,主要从事电力系统保护、控制与自动化研究 E-mail:epzxcai@scut.edu.cn
  • 作者简介:蔡泽祥( 1960-) ,男,教授,博士生导师,主要从事电力系统保护、控制与自动化研究
  • 基金资助:

    国家自然科学基金资助项目( 51377059)

Probability Model and Risk Assessment of False Tripping of Traveling Wave Protection on UHVDC Transmission Lines Under Thunder Strike

CAI Ze-xiang1 LIANG Yi1 TIAN De-liang1 LI Xiao-hua1 LI Shu-yong2   

  1. 1.School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Electric Power Research Institute of China Southern Power Grid,Guangzhou 510080,Guangdong,China
  • Received:2016-05-06 Revised:2016-05-15 Online:2016-11-25 Published:2016-10-04
  • Contact: 蔡泽祥( 1960-) ,男,教授,博士生导师,主要从事电力系统保护、控制与自动化研究 E-mail:epzxcai@scut.edu.cn
  • About author:蔡泽祥( 1960-) ,男,教授,博士生导师,主要从事电力系统保护、控制与自动化研究
  • Supported by:
    Supported by National Natural Science Foundation of China( 51377059)

摘要: 特高压直流线路行波保护存在雷击工况下的误动风险,而简单提高定值会带来高阻接地时的保护拒动风险. 针对该问题,文中提出以线路落雷率、绕击率、波头参数分布概率和考虑雷击位置的行波保护误动区间等参数构成雷击工况下特高压直流线路行波保护的误动概率模型,根据叠加原理计算误动概率,结合雷电活动数据求取误动频率,并以上述两项指标实现对行波保护的雷击误动风险评估. 最后以南方电网某特高压直流线路为例,利用实际参数与录波结果对文中方法进行评估,所得结果与实际工程统计结果相符.

关键词: 特高压直流线路, 行波保护, 误动分析, 概率模型, 风险评估

Abstract:

There exists a false tripping risk in the traveling wave protection on UHVDC transmission lines under thunder strike,and simply increasing the set value may cause an action failure when high resistance earthing happens.In order to solve these problems,a probability model to analyze how the traveling wave protection falsely trips on UHVDC transmission lines under thunder strike,is constructed by using the parameters including the thunderbolt rate on transmission lines,the shield failure rate,the distribution probability of wave fronts and the false tripping section of traveling wave protection on the basis of thunder strike location.Then,malfunction probability is calculated on the basis of superposition principle,and malfunction frequency is obtained from the data of lightning activity.Furthermore,by adopting the two indicators,the risk assessment of the false tripping is performed.Finally,by taking a UHVDC transmission line of China Southern Power Grid as an example,the proposed method is verified by using both actual parameters and wave recording data,finding that the results accord well with the practical engineering statistics ones.

Key words: UHVDC transmission lines, traveling wave protection, false tripping analysis, probability model, risk assessment