Research on Key Node Identification Method of Transmission Network based on Improved PageRank Algorithm

In order to effectively identify the key nodes before power grid failure, an improved PageRank algorithm is proposed to identify the key nodes in power system. Firstly, establish undirected network, introduce power flow and establish network model. Secondly, the node types are divided and the transmission matrix is established. Finally, according to the equivalent impedance value, the Google electric matrix is established to form an improved PageRank algorithm to identify the key nodes in the power system. The simulation results of IEEE 39 bus system show that this method is feasible and effective in terms of load loss and transmission capacity.