Identification of Critical Nodes in Large Power Grid Based on Page Rank Algorithm

Considering the similar characteristics of complex network between the power grid and the Internet, this paper proposes an identifying method of the critical nodes of the large power grid based on the Page Rank algorithm. First, the original power grid Google matrix is constructed on the basis of power grid topology and actual power flow; Second, the different role of node type (PV/PQ) in load supply and power transmission is considered to modify the Google matrix; Then, the influence of node failure on power fluctuation and voltage deviation is integrated as grid security factors. Finally, the Page Rank algorithm is used to identify the critical nodes that affect load supply and system security. Taking the IEEE 30-Bus system as an example, the effectiveness of the proposed method is verified by the simulation of intentional attack on critical nodes and comparison with other methods.