Voltage Identification Method for Fragile Nodes in Power Grid Based on Generalized Node and Entropy Theory
In order to avoid a series of cascading faults in the power system,it is necessary to provide corresponding indicators and models for evaluating the most critical vulnerable nodes in the power grid.Considering the sensitivity of traditional DC transmission systems to AC grid commutation voltage,a voltage identification method for vulnerable nodes in the power grid based on generalized node and entropy theory is proposed.This method combines the general principle of entropy,The singular value entropy,power flow distribution,and transfer entropy of generalized nodes when the power grid is impacted are unified as the identification basis for vulnerable nodes in the power grid.The entropy weight method is used to modify the AHP method to obtain comprehensive weight coefficients,fully considering the subjective and objective impact factors of each indicator.The weight coefficients of the comprehensive evaluation model for vulnerable nodes are obtained using the Analytic Hierarchy Process and entropy weight method.Finally,the effectiveness and practical application value of this method for identifying vulnerable nodes in the overall power grid were verified through IEEE 39 node system simulation results,confirming that this method can effectively measure the impact of AC grid voltage fluctuations on DC transmission systems.
generalized nodesvulnerabilitysingular value entropycurrent distribution entropycurrent transfer entropy
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