Identification of vulnerable lines in power grid based on complex network theory
Sun Ke · Dianli zidonghua shebei · 2006
Critical lines may have serious impacts on large scale blackouts and cascading failures in power grid.Based on complex network theory,the weighted line betweenness is proposed as line vulnerability index,which is defined as the sum of currents through the line as the shortest electric path between generator nodes and load nodes.The weighted line betweenness is then modified to the highest betweenness of all neighboring lines.Vulnerability analysis is carried out on the IEEE 39-bus system and the Huazhong-Chuanyu power grid,and the time-domain simulation results verify that the weighted line betweenness can identify critical lines,which have light loads but great impacts on line vulnerability due to their special position in the power grid.This project is supported by the National Basic Research Program(973 Program)(2004 CB217902)and the Innovative Research Group Fund of Natural Science Foundation of China(60421002).