Topological Modeling Research on the Functional Vulnerability of Power Grid under Extreme Weather

Abstract

The large-scale interconnection of the power grid has brought great benefits to social development, but simultaneously, the frequency of large-scale fault accidents caused by extreme weather is also rocketing. The power grid is regarded as a representative complex network in this paper to analyze its functional vulnerability. First, the actual power grid topology is modeled on the basis of the complex network theory, which is transformed into a directed-weighted topology model after introducing the node voltage together with line reactance. Then, the algorithm of weighted reactance betweenness is proposed by analyzing the characteristic parameters of the power grid topology model. The product of unit reliability and topology model’s characteristic parameters under extreme weather is used as the index to measure the functional vulnerability of the power grid, which considers the extreme weather of freezing and gale and quantifies the functional vulnerability of lines under wind load, ice load, and their synergistic effects. Finally, a simulation using the IEEE-30 node system is implemented. The result shows that the proposed method can effectively measure the short-term vulnerability of power grid units under extreme weather. Meanwhile, the example analysis verifies the different effects of normal and extreme weather on the power grid and identifies the nodes and lines with high vulnerability under extreme weather, which provides theoretical support for preventing and reducing the impact of extreme weather on the power grid.

Resilience Capacity Evaluation for the Safety Management System of Power Grid Enterprise Based on AHP-MEE Model

“…e weak links of the safety resilience of the enterprise are then discovered so that the modern safety management system of the enterprise can be improved and supplemented. we summarized the research content related to resilience done by the predecessors, combined the opinions of experts in the safety field, divided the enterprise's resilience capability level boundary, and obtained the enterprise safety resilience level domain U. us, the classical domain R i of each level of power, the enterprise is determined by formula (7) as follows [27]:…”

“…For electric power enterprises, the ability to resist risk impact and recover and optimize after impact is an integral part of the safety management level of the power system. Xie et al [7] simulated the grid bearing capacity under extreme weather, analyzed grid vulnerability and risk tolerance under different environments, and identified the nodes and lines that are highly vulnerable to extreme weather, providing theoretical support for preventing and reducing the impact of extreme weather on the grid. Bian et al [8] dynamically analyzed the evolution process from the cause to the result of power grid trip accidents and quantitatively calculated the probability of power grid trip accidents caused by natural disasters, providing technical support for the prevention, treatment, and recovery of power grid trip accidents.…”

Electric Grid Vulnerability Analysis to Identify Communities Prone to Wildfires

“…Topological and logical methods are useful for assessing the grid's connections [9] and identifying critical elements [10], [11]. Approaches, like minimum cut-set vulnerability analysis, assess cascading failures [12] or identify lines prone to over use during a contingency event [13], or the identify vulnerable nodes using graph theory betweenness centrality [14].…”