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:  111
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:  2024
:   .., .. // . 111. .: , 2024. .118-146. DOI: https://doi.org/10.25728/ubs.2024.111.5
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(.):  resilience of electrical networks, search for critical nodes, graph models of networks
:   , , . ( ), . -- . , , . . , , , . , , . , , . , , .
(.):  One of the classes of problems solved in the assessment of the stability of an engineering network is the problem of finding critical nodes. In many formulations, this problem is posed as finding a subset of nodes of a given cardinality (critical nodes) such that the failure of which would cause maximum damage to the entire network. And the most common way to assess the damage in such a formulation is to determine the number of connected node pairs in the network with excluded critical nodes. For such nodes that correspond to the minimum number of connected pairs, additional measures are required to increase reliability and safety. Several methods of solving the problem of finding critical nodes use reducing it to an equivalent linear programming problem. The main problem of this approach is the large size of the problem, and consequently, the high computational complexity of its solution. The work conducts research on various characteristics of vertices of a graph model of a network, the analysis of the values of which will allow determining in advance the fact of belonging to the subset of critical or, conversely, to the subset of non-critical nodes. Thanks to this, it is possible to form additional constraints that reduce the dimensionality of the linear programming problem and its computational complexity, which will allow finding critical nodes in engineering networks with a large number of objects in an acceptable time. During the research, a large number of different subproblems were solved, so the work describes only the first, preparatory part of it.

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