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.
Highlights
The power grid is the foundation of the national power supply, and its safe and reliable operation exerts a profound impact on national security, stability, and economic development [1]
The topology of the power grid was modeled based on the complex netIn this paper, the topology of the power grid was modeled based on the complex work theory, which considers the impact of extreme weather on power grid and researches network theory, which considers the impact of extreme weather on power grid and rethe functional vulnerability of the power grid
The main contributions of this as follows: a topology model of the power grid based on complex network modeling was paper are as follows: a topology model of the power grid based on complex network modconstructed; a functional vulnerability model based on reliability was established; and the eling was constructed; a functional vulnerability model based on reliability was estabproposed model was verified through a simulation experiment
Summary
The power grid is the foundation of the national power supply, and its safe and reliable operation exerts a profound impact on national security, stability, and economic development [1]. The trend for power system development worldwide lies in the large-scale interconnection of the power grid, which has brought great benefits to the development of the national economy as well as other fields. Power grid accidents have been occurring frequently recently, inflicting enormous losses on physical and economic security and seriously hindering social harmony, stability, and long-term development.
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