Power grid vulnerability assessment method considering minimum singular value sensitivity entropy

Abstract

The invention discloses a power grid vulnerability assessment method considering the minimum singular value sensitivity entropy and belongs to the field of power grid vulnerability assessment. The method includes the steps of obtaining a Jacobian matrix of a tidal current equation for a power grid to be evaluated, conducting singular value decomposition on the matrix, obtaining the sensitivity ofthe minimum singular value to a system state variable; obtaining the sensitivity of the minimum singular value to the control variable according to the hidden function derivation rule, selecting out the sensitivity of the minimum singular value to the node input active power and normalizing the data vectors; calculating the minimum singular value sensitivity entropy of the Jacobian matrix definedby the method according to the information entropy definition in combination with the weighted entropy theory, and defining a power grid vulnerability comprehensive evaluation index by using three indexes including a comprehensive power flow entropy, a minimum singular value and a minimum singular value sensitivity entropy, through a hesitation fuzzy decision method considering the reliability. According to the power grid vulnerability assessment method, the vulnerability of the power grid under multiple states can be evaluated, and the fragile link of the power grid can be effectively identified.

Description

technical field [0001] The invention belongs to the technical field of power grid vulnerability assessment, in particular to a power grid vulnerability assessment method considering the minimum singular value sensitivity entropy. Background technique [0002] In recent years, there have been many cascading failures and large-scale power outages in the world, which are closely related to the vulnerable links of the power grid. Therefore, the vulnerability assessment and identification of vulnerable links in the power grid have become the focus of domestic and foreign scholars. Not only to grasp the rule that the vulnerability of the power grid changes with the operation of the system, but also to screen out the vulnerable links of the power grid, which is of great significance to prevent cascading failures. [0003] At present, the power grid vulnerability assessment method models mainly include models based on complex network theory and models based on accident chain theory....

AI Technical Summary

Problems solved by technology

The evaluation model based on cascading fault accident chains is mostly used to analyze the vulnerable links in the occurrence of cascading faults. These studies are helpful to understand the evolution law of cascading faults. There are mainly power grid cascading fault models based on Monte Carlo simulation analysis, combined with the set of fault chains and structural importance to assess power grid vulnerability, as well as a power grid vulnerability assessment model based on risk theory and protection accident chain model. The physical meaning of this type of method is clear, but it is suitable for assessing the vulnerability of the power grid

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