Invulnerability Analysis of Power Grid Considering Grounding Grid Faults Based on Gravity Method

How to use quantitative analysis methods to identify the importance of nodes in power grids is a hot topic in power grid research. Drawing on the theory of complex grid systems and considering the multi-attribute characteristics of network nodes, this paper proposes a method for evaluating the importance of network nodes and an improvement strategy for system invulnerability. Firstly, based on the gravity method, a node importance evaluation algorithm for the structural hole gravity model was constructed by comprehensively considering the node H-index, node position, and structural hole position, and the evaluation criteria for the evaluation algorithm were provided. At the same time, the impact of grounding grid faults on the importance analysis of system nodes was considered in the calculation and analysis. Secondly, based on the above analysis, optimization measures have been established to improve the invulnerability of the power grid. Finally, the rationality of the method proposed in this paper is verified through calculation and analysis under various operating conditions using IEEE 30 node examples and actual systems. Among them, the actual system utilizes the monitoring results of the grounding grid to calculate the importance of system nodes. The calculation results show that the algorithm proposed in this paper can better identify important nodes in the power system grid compared to the betweenness centrality method, and the system resilience enhancement strategy has good effectiveness and robustness.