Identification of power grid critical nodes based on voltage anti-interference factors and comprehensive influence factors

Most of the existing identification methods fail to comprehensively evaluate critical nodes. From the viewpoint of anti-interference abilities and influence abilities, an evaluation method overlaying multiple perspectives is presented. Based on operational reliability theory, the anti-interference factors under branch outage contingency are established in this paper, which overcome the shortage that traditional methods only consider load fluctuation. Based on electric betweenness and entropy of power flow impacts, the index sets including topological structure influence factors and operating state influence factors are established, which can comprehensively characterize the effects of nodes in power grid. Simulation results of IEEE 30-bus system show that the critical nodes identified in this paper are comprehensive and efficient.