Identification method of vulnerable nodes of distribution network

Abstract

The invention discloses an identification method of vulnerable nodes of a distribution network. The method includes the following steps: (1) establishing vulnerability evaluation indexes based on complex network theory, and a risk evaluation index based on risk theory; (2) using a hierarchical analysis method to carry out weighted summation on the vulnerability evaluation indexes of the distribution network and comprehensively analyze the vulnerability indexes and the risk index, and establishing a comprehensive estimation index of node vulnerability of the distribution network; (3) acquiringstructure data of the distribution network and a power flow calculation result, and calculating the comprehensive estimation index of the distribution network; and (4) outputting the relatively vulnerable nodes of the distribution network. The comprehensive estimation index has the following advantages that: the complex network theory and the risk theory are adopted, a structure of the distribution network is taken into account, fault risks are taken into account, and the identification problem of the vulnerable nodes in the distribution network is comprehensively solved.

Description

technical field [0001] The invention relates to the technical field of power system safety operation evaluation, in particular to a method for identifying vulnerable nodes of a distribution network. Background technique [0002] Since the Russian Moscow blackout in 2005, global blackouts have occurred frequently, which has led to further attention to the security of the power system. Therefore, the concept of power grid vulnerability has attracted the attention of scholars. The so-called power grid vulnerability is to find out the weak nodes or lines in the power grid. When these nodes or lines are affected by the outside world or the system is disturbed, it will lead to successive failures of line components and cause large-scale power outages. Therefore, before the system fails, find out the weak links of the whole system according to the various parameters of the system and improve them, which will greatly reduce the probability of major blackouts in the system. [0003]...

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Problems solved by technology

[0003] At present, a large number of vulnerability studies are mainly concentrated on the transmission network, and the research on the distribution network is still in its infancy. With the development of new energy and the improvement of various distributed power sources, the distribution network will be connected to distributed power sources. This will have an impact on the structure of the distribution network, which may lead to weak links in the distribution network and increase the probability of failure

Most of the current vulnerability assessments are based on complex network theory, and they are all aimed at the vulnerability assessment of the transmission network. Considering that most distribution networks are radial networks with open-loop operation, many of the assumptions and evaluation indicators are It is no longer applicable, so it is not suitable to directly transplant the evaluation system to the distribution network, and needs to be improved and improved

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