南方电网技术2017，Vol.11Issue(9)：70-78,9.DOI:10.13648/j.cnki.issn1674-0629.2017.09.011
故障导致电力系统不可观情况下的故障定位方法
Fault Location Method when Power System Un-Observable Caused by Fault
摘要
Abstract
The topology of power grid will change when a failure occurs, which may cause the power system to lose its observability. Existing identification method ignores the influence of this special condition on accuracy of fault location.If the fault can be located ac-curately, the protection strategy will be taken after failure to prevent the expansion of the fault.In this paper, calculation method of unbalanced current in conventional power grid structure is analyzed, and the relationship between unbalanced current and fault line after fault is studied.Further, several possible phasor measurement unit ( PMU) configurations are analyzed, the relationship between PMU configuration position and power system being not observable after fault is discussed, and the variation rule of the unbalanced current value under the condition of losing observability is revealed.By using the unbalanced current calculated value to derive the fault loca-tion, a fault location method is proposed, and a fault location process is developed.A 35-node power system is built with BPA simula-tion software to compare the location effect under different PMU configuration positions.Results show that the proposed method can accurately locate the fault.The proposed method is applicable to the wide-area backup protection with action information from protec-tion devices, and extends the application of short-circuit fault location.关键词
可观性/故障分析/故障定位/不平衡电流Key words
observability/fault analysis/fault location/unbalanced current分类
信息技术与安全科学引用本文复制引用
秦骏达,毕天姝..故障导致电力系统不可观情况下的故障定位方法[J].南方电网技术,2017,11(9):70-78,9.基金项目
国家自然科学基金项目( 51627811 ) （ 51627811 ）
中央高校基础研究基金(2016ZZD01) （2016ZZD01）
"111"计划项目(B08013).Foundation item:Supported by the National Natural Science Foundation of China(51627811) （B08013）
the Fundamental Research Funds for the Central Universities (2016ZZD01) （2016ZZD01）
the "111" project (B08013). （B08013）
