文章摘要
陈国平,王玉玲,王德林,等.基于站域信息缩短3/2接线失灵(死区)故障切除时间的策略[J].电力系统自动化,2018,42(21):119-124. DOI: 10.7500/AEPS20180305002.
CHEN Guoping,WANG Yuling,WANG Delin, et al.Strategy of Shortening Circuit Breaker Failure and Dead Zone Removal Time for 3/2 Breaker Connection Based on Substation Area Information[J].Automation of Electric Power Systems,2018,42(21):119-124. DOI: 10.7500/AEPS20180305002.
基于站域信息缩短3/2接线失灵(死区)故障切除时间的策略
Strategy of Shortening Circuit Breaker Failure and Dead Zone Removal Time for 3/2 Breaker Connection Based on Substation Area Information
DOI:10.7500/AEPS20180305002
关键词: 开关失灵  死区故障  站域信息  电流互感器  拖尾电流  系统稳定
KeyWords: circuit breaker failure  dead zone fault  substation area information  current transformer  tailing current  system stability
上网日期:2018-09-18
基金项目:
作者单位E-mail
陈国平 国家电网有限公司, 北京市 100031  
王玉玲 国家电网有限公司, 北京市 100031  
王德林 国家电网有限公司, 北京市 100031  
徐凯 国家电网有限公司, 北京市 100031 xu-kai@sgcc.com.cn 
吕鹏飞 国家电网有限公司, 北京市 100031  
张月品 北京四方继保自动化股份有限公司, 北京市 100085  
杜丁香 中国电力科学研究院有限公司, 北京市 100192  
摘要:
      随着特高压直流工程快速发展,受端交流系统故障切除时间过长会导致多回特高压直流同时连续换相失败,产生的大幅功率冲击存在导致送受端系统稳定破坏的风险。目前按照传统设防标准,开关失灵和死区(以下简称“失灵(死区)”)故障切除时间可能超过400 ms,已不适应当前电网安全稳定运行要求。在简述目前应用于电网中失灵保护动作逻辑及其不足的基础上,提出了适用于3/2接线的站域失灵(死区)保护工程应用技术方案,并介绍了基于站域信息缩短失灵(死区)故障切除时间的策略。利用保护动作信息,实现跳闸组的快速定位;利用跳闸组内各开关的电流特征比较、无流定值自适应调整等手段,减小电流互感器拖尾电流对保护判据的影响;通过专用光纤通信、分相直接跳闸等方法,缩短通信延时、减少跳闸重动环节。利用实时数字仿真器试验对保护策略进行了验证,同时分析了该方案存在的风险点。
Abstract:
      With the rapid development of ultra high voltage direct current(UHVDC)project, the excessive fault removal time at the receiving end of the AC system will lead to continuous commutation failure of UHVDC. The resulting large power shocks will put the stable operation of the system at risk. Based on the traditional protection criteria, the fault removal time of AC system circuit breaker failure and dead zone(CBF & DZ)might be over 400 ms, which could no longer meet the stability requirements of modern power grid. On the basis of a brief description of the failure protection logic used in CBF & DZ and their deficiencies, the engineering application technology scheme of CBF & DZ protection for 3/2 breaker connection is proposed, and the strategy of shortening the CBF & DZ removal time on the basis of substation area information is introduced. To be more specific, firstly, using the set of conditions formed by the integrated protection fault information, a fast and accurate location of the fault breakers is realized. Secondly, harnessing switch current comparison and adaptive adjustment of no current setting are used to reduce the influence of current transformer trailing current on the protection criterion. Thirdly, by constructing dedicated optical fiber channel and split phase tripping method, the communication delay is reduced and the reinitiated tripping stage is reduced. The proposed protection strategy is verified through real time digital simulator(RTDS)test and the potential risks are analyzed as well.
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