文章摘要
武霁阳,何竞松,彭光强,等.基于虚拟电流网络的换流器最后断路器保护[J].电力系统自动化. DOI: 10.7500/AEPS20190301003.
WU Jiyang,HE Jingsong,PENG Guangqiang, et al.Last Breaker Protectionfor Converter Based on Virtual Current Network[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20190301003.
基于虚拟电流网络的换流器最后断路器保护
Last Breaker Protectionfor Converter Based on Virtual Current Network
DOI:10.7500/AEPS20190301003
关键词: 最后断路器保护  二分之三接线  虚拟电流网络  直流输电
KeyWords: last breaker protection  3/2 wiring  virtual current network  DC transmission  
上网日期:2019-11-07
基金项目:
作者单位E-mail
武霁阳 中国南方电网超高压输电公司检修试验中心 wujy0451@163.com 
何竞松 中国南方电网超高压输电公司检修试验中心 soogleasy@qq.com 
彭光强 中国南方电网超高压输电公司检修试验中心 415906206@qq.com 
李清 中国南方电网超高压输电公司检修试验中心 liqing6291@163.com 
国建宝 中国南方电网超高压输电公司检修试验中心 gjb104@163.com 
杨光源 中国南方电网超高压输电公司检修试验中心 yangguangyuan1@ehv.csg.cn 
摘要:
      目前,换流器最后断路器保护存在可靠性差、逻辑复杂或预警性不足等问题,实际工程也出现了换流器最后断路器保护误出口事件。为此,文中首先梳理了实际工程换流器最后断路器保护的实现策略,并在换流器最后断路器电流回路特征分析的基础上,构造了虚拟交流出线电流网络和虚拟母线电流网络,继而提出了一种基于虚拟电流网络的换流器最后断路器保护算法,从原理上解决了最后断路器识别问题。所提算法与实际工程应用的算法进行了对比测试,测试结果表明所提算法可正确的识别最后断路器,原理清晰可靠,且有效避免了实际工程算法逻辑复杂、需要遍历等问题。
Abstract:
      At present, the converter last breaker protection has the problems of poor reliability, complex logic or insufficient early warning, and there was a undesired tripping event of the converter last breaker protection in actual project. Therefore, the current characteristics of converter last breakers are analysed in the paper, and a virtual AC line current network and a virtual bus current network are structured. Based on the virtual current networks, a novel converter last breaker protection scheme is proposed, which can solve the the problem of identifying the converter last breaker in principle. The proposed protection scheme and the converter last breaker protection schemes used in actual projects are tested, and the results demonstrate that the proposed protection schemes can correctly judge the last breakers with clear and reliable principle, and avoid the problems of complex logic and traversing all working condition.
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