电测与仪表2026，Vol.63Issue(6)：84-91,8.DOI:10.19753／j.issn1001-1390.2026.06.009
N-1安全网络约束下基于综合潮流熵的输电网关键线路辨识方法
Identification method of critical lines in transmission grid based on integrated flow entropy under N-1 security network constraints
摘要
Abstract
Identifying critical transmission linesprone to triggering cascading failures is vitalto ensure the operational security of power system.Existing studies on critical lines overlook N-1 security network constraints and the bidirec-tional flow transfer effects between target and other lines.This paper proposes a method for identifying critical lines in transmission grid based on integrated flow entropy under N-1 security network constraints,improving accuracy of critical line identification and effectiveness of cascading failure defense.An entropy index with interval-weighted av-erage load rates is established,representing the impact of different N-1 contingencies on the load rates of target lines.A flow distribution entropy index is also built by weighting the interval-average load rate with probabilities of N-2 line outages,measuring the consequences of target line disconnections from load distribution balance.Hence,a comprehensive flow entropy index is constructed to identify critical linesprone to cascading failures more accurate-ly under N-1 security constraints.Based on the IEEE 39-bus system,comparative results show that the proposed method identifies critical lines more accurately.Expanding the critical lines can significantly reduce the risk of load loss due to cascading failures.关键词
关键线路/加权潮流影响熵/加权潮流分布熵/综合潮流熵/输电网Key words
critical lines/weighted power flow impact entropy/weighted power flow distribution entropy/integrated power flow entropy/transmission grid分类
信息技术与安全科学引用本文复制引用
王峥,牟善科,康海鹏,庄侃沁,陈浩,程浩忠..N-1安全网络约束下基于综合潮流熵的输电网关键线路辨识方法[J].电测与仪表,2026,63(6):84-91,8.基金项目
国家电网有限公司华东分部科技项目(52992424000Z) （52992424000Z）
