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Research on Identification Method of Fragile Component of Power Grid Considering Both Structure and State

Whether in the power grid planning, design or operation stage, the identification of fragile component in the power system is always one of the core issues of power grid security analysis. In order to realize the accurate positioning of fragile lines, firstly, considering the overall distribution characteristics and local fluctuation characteristics of the power flow under the disturbance of the breaking, a composite entropy evaluation model of fragile components based on the distribution entropy and transfer entropy of the power flow is proposed. Secondly, the power flow betweenness evaluation method based on the power transmission transfer distribution factor is used to measure the transmission contribution and carrying capacity of the branch in the power grid. Through normalization, a comprehensive evaluation index for vulnerable branches is established. Aiming at the proposed identification method, the IEEE10 machine 39-node calculation example and comparison with other methods show that the method in this paper can more comprehensively and accurately identify the fragile branch of the power grid.