Abstract:A hypernetwork model for power network based on the connection between nodes and lines is constructed by hypernetwork theory.The vulnerability of the line is evaluated using data field theory.Among them,the multi-attribute comprehensive index of the line is defined as an index to measure the quality of the line.The index includes line degree product,electrical betweenness and tide transfer entropy.The shortest path based on hypergraph is used to solve the radiation radius of lines.The entropy is used as a measure of the uncertainty of influencing factors and the problem of solving the optimal influence factor is transformed into the minimum entropy value problem,and the algorithm is solved by a simple heuristic algorithm.Finally,the impact of the line on the entire network is defined as the impact rate of the line,and is taken as the index of the vulnerability evaluation of the line.IEEE-39 node system is used to test the method.The result shows that the high influence rate of lines play key roles in the network,and the faults or malicious attacks of these lines will have a great bad impact on the whole grid.The validity and accuracy of the proposed method is verified by the simulation.