Power grid node importance degree determination method

Abstract

The present invention proposes a power grid node importance degree determination method. The power grid node importance degree determination method comprises: firstly, abstracting a power grid into a directed graph according to a topological connection condition and an active power flow direction; secondly, in order to combine node importance degree evaluation with an operating mode of the power grid, taking power supply and load apparent power of a node as a branch flowing in and out of the node by introducing a power supply node and a load node, and using a value of power flow apparent power of the branch as a weight of the directed graph; and and thirdly, in combination with the actual circumstance of the power grid, defining a measurement index of a power grid node importance degree to be the sum of an authority value and a hub value of the node, and adopting an MBCC-HITS algorithm to implement the calculation of the power grid node importance degree. The power grid node importance degree determination method provided by the present invention can reasonably and efficiently calculate importance degrees of nodes of the power grid. The result is closely related to the operating mode. The node importance degrees obtained with the method can be applied to the aspects of risk evaluation, maintenance schedule optimization arrangement and the like of power grids at different levels.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to a method for determining the importance of grid nodes. Background technique [0002] In recent years, many large-scale power outages at home and abroad have caused huge economic losses to human society, seriously threatened social security, and greatly aroused people's attention to the reliability of power grids. Studies have shown that the collapse of a small number of important nodes in the power grid will cause a sharp drop in grid connectivity, and serious faults on important nodes will cause cascading faults, which will eventually lead to power angle instability of the entire system. Therefore, accurate identification of important nodes of the power grid is helpful for power grid enterprises to implement differentiated management, such as operating personnel to strengthen the protection of important nodes in advance to ensure the safe and stable operation of the power grid. In ...

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Problems solved by technology

Using the degree, betweenness, node cohesion degree and other indicators in the theory, the power grid is abstracted into an undirected weighted graph. The weights of the edges in the network are mostly given based on the reactan

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