摘要
针对当前继电保护运行状态评价难以及时有效地反映保护实时运行情况,难以实现保护系统的在线自动分析与状态评价的问题,提出了保护运行状态的在线评价方法。引入了测量截距的概念,提出了基于测量截距的故障线路识别方法,避免了经过渡电阻接地时测量阻抗难以反映故障点到保护安装处实际阻抗的影响。构建了保护运行状态评价方法,通过建立保护信息矩阵分层传输保护实时动作概率信息。利用故障元件和非故障元件保护动作概率信息实现对保护"四性"的评价。最后通过仿真对某实际电网进行了不同故障情况下的保护运行状态评价,结果表明该方法能够快速识别故障线路并合理有效地完成保护运行状态评价。
To solve the problems that current protection operational state evaluation is ineffective to reflect the real-time operation of protection and accomplish online analysis and evaluation for protection system automatically, an online evaluation method of protection operating state is proposed. Based on the concept of measuring intercept, a fault line identification method is introduced, which avoids the influence of transition resistance on the distinction between measured impedance and real impedance from fault point to relay location. Evaluation method for operating state of protection system is built. Layered transmission of real-time operation probability message is realized through the establishment of the protection information matrices. The evaluation of protection ＂four characteristics＂ is done using operation probability of fault elements and non-fault element. Simulation of protection operation evaluation on different fault conditions in actual grid validate that the proposed method can identify the fault line rapidly and is effective and reasonable to evaluate operation state of the protection.
作者
刘譞
李川
LIU Xuan LI Chuan(Baoding Electric Power VOC. ＆ TECH. College, Baoding 071051, China Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2017年第8期113-120,共8页
Power System Protection and Control
关键词
继电保护
动作概率
故障识别
状态评价
protective relaying
operation probability
fault identification
state evaluation
