Identification Of Vulnerable Links In Power System Based On Active Power Flow Betweenness And Power Flow Entropy

The vulnerability evaluation of power grid describes the ability of the system to cope with interference or failure,as well as possible trends in the operation of the system.The identification of vulnerable links in power grid will help to take effective prevention and control measures so that the system can be restored to the stable operation level,which is of great significance to prevent chain failure of power system.First,the introduction and improvement of the impact of the identification of electrical barriers to the electrical indicators.The active power flow betweenness can quantitatively evaluate the importance of the line and node in the grid topology.The entropy of power system distribution mainly evaluates the node vulnerability from the point of view that the node load impact affects the whole system.The improved power flow transfer entropy combined with the line thermal stability limit and isolated system to determine the two aspects of the identification of fragile lines.The minimum singular value from the perspective of system voltage stability can determine the current operating state from the system voltage collapse point of the adjacent degree.Then,the process of identifying the vulnerable lines and nodes in power grid is analyzed emphatically.Based on the probabilistic risk entropy method and the intuitionistic fuzzy set theory,the intuitionistic fuzzy probability risk entropy method is defined.The advantages of the probability risk entropy method in measuring the importance of objective information and the theory of intuitionistic fuzzy sets are used to describe the importance of subjective information.The combination of superiority,relative to the simple objective weighting method and subjective weighting method is more practical and versatile,and then obtains the corresponding comprehensive vulnerability index of node and line.Finally,based on the New England 10 machine 39 node system for vulnerable nodes and lines identification model validation analysis.The method of calculating the weight of the electrical index is studied by using the intuitionistic fuzzy probability risk entropy theory.The identification method of the power grid is evaluated by using the identification method of this paper.At the same time,the identification result of this method is compared with the identification result of other methods so as to verify the comprehensiveness and validity of the model.