一起连锁故障的仿真模拟与理论分析_黄淼.pdfVIP

第 42 卷 第 13 期 Vol.42 No.13 2014 年 7 月 1 日 Power System Protection and Control Jul. 1, 2014 ： Simulation and theoretical analysis of a cascading fault 1 2 1 1 1 1 HUANG Miao , HUANG Min , ZHUANG Kai , WEN Yi-yu , LIU Yu-ming , ZHU Sheng-yi (1. State Grid Chongqing Electric Power Co. Electric Power Research Institute, Chongqing 401123, China; 2. State Grid Chongqing Power Maintenance Branch Company, Chongqing 400039, China) Abstract: This paper describes and analyzes a cascading fault in an actual power grid. During the temporal evolution of the complicated contingency, not only several fault patterns occurred successively on a 110 kV line, but also a substation main transformer and another 110 kV line, which was powered by the faulted line, tripped due to the operation of some protection devices. This paper uses simulation and theoretical analysis to discuss the operation behavior and reasons of corresponding protection devices, and derives the mathematical formulae of related electric quantities in case of open-phase fault of phase C and lap joint of phase B and phase C. Simulation and theoretical calculation results show that the proposed analysis is effective and correct. Key words: cascading failure; relay protection; fault analysis; simulation 中图分类号： TM711 文献标识码：A 文章编号： 1674-3415(2014)13-0139-07 2011 年末，重庆市某地区一条 110 kV 线路在 发生故障期间，其供电的某变电站 1 号主变零序过 压保护动作，另一条 110 kV 线路在该区外故障下距 离 I 段保护两次动作跳闸。 故障分析是提升电力系统运行管理水平的重 要环节[1-6] 。为查