基于连锁过载故障发生机理的关键线路辨识  

Identification of Critical Lines Based on the Developing Mechanism of Cascading Overload Fault

作　　者：何培颖 房鑫炎[1] HE Peiying;FANG Xinyan(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai200240,China)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《电力系统及其自动化学报》2018年第8期76-80,共5页Proceedings of the CSU-EPSA

摘　　要：电网关键线路的辨识,对于预防由单一故障引发的大面积停电事故具有重要意义。本文提出一种基于连锁过载故障发生机理的关键线路辨识方法。根据支路开断引起电力系统潮流转移特性,分析了连锁过载跳闸的发生机理,并推导得到连锁过载保护动作判据。根据该判据,定义功率转移指标和电网潮流熵指标来量化反映支路开断后引起的潮流转移程度和支路负载率分布情况。综合这两项指标对电网关键线路进行辨识,通过两种攻击模式下网络效能的降低来验证所辨识关键线路的合理性。最后以IEEE-39节点系统为例进行仿真计算,验证了所提方法的合理性与有效性。The identification of critical lines is of great significance to the prevention of large-area blackout caused by one single fault.In this paper,an identification method for critical lines based on the developing mechanism of cascading overload fault is proposed.According to the characteristics of power flow transferring caused by line tripping,the developing mechanism of cascading overload is analyzed,then the action criterion of protection in the case of cascading overload is formulated.Based on this criteria,power transferring index and power flow entropy index are defined to reflect the degree of flow transferring and the distribution of load rates on lines.With the combination of these two indexes,the critical lines can be identified.Moreover,two attack modes are adopted to verify the validity of critical lines through the reduction of network efficiency.At last,the simulation results of an IEEE 39-node system verify the validity and effectiveness of the proposed method.

关 键 词：连锁过载 潮流转移 潮流熵 关键指标 连锁攻击 

分 类 号：TM711[电气工程—电力系统及自动化]