Assessment Method of Vulnerable Lines in Power System Based on Comprehensive Betweenness

Scientific and rapid assessment of vulnerable lines in power system is very important to ensure the safe operation of power grid, which are closely related to complex network characteristic of power system and by using traditional electrical betweenness. At present, in vulnerable lines assessment based on traditional electrical betweenness, there are some problems such as not setting assessment trigger condition, not comprehensively characterizing the importance of the line, and not effectively taking into account its reliability of the line. For this reason, this paper proposes a method of vulnerable line assessment based on comprehensive betweenness. In this method, the improved electrical betweenness is established and the comprehensive betweennes indicator is proposed based on it, which can realize the scientific representation of the importance and reliability of the line. At the same time, set the complex network characteristics as the trigger condition for assessment. The experimental results show that the proposed method can greatly improve the accuracy of vulnerable line assessment compared with the results based on traditional electrical betweennes while this method can greatly reduce the assessment time compared with traditional simulation. The method in this paper gives consideration to the assessment efficiency while ensuring the assessment accuracy.