Abstract
The power grid is a critical component of city infrastructure. If it is damaged by an earthquake, there can be a huge impact on the safety and well-being of society and individuals. Identifying nodes in the grid that are highly vulnerable to earthquake damage is significant for effective pre-earthquake damage prevention, emergency response, and post-earthquake relief. Three indicators, the probability of node disconnection, the node hierarchical level, and the node critical threshold, were chosen, and their combined ability to represent node vulnerability to damage from an earthquake event was analyzed. A variable fuzzy clustering model was used to classify and order the nodes in the grid. The 20-node power grid of a city was used as an example to show how highly vulnerable nodes were identified, and how the reasons for the high vulnerability of these nodes were drawn out of the analysis. Countermeasures were given to reduce network vulnerability. The variable fuzzy clustering method used in this paper offers a new perspective on network vulnerability, and it quantifies the vulnerability of grid nodes more comprehensively than existing methods of assessing grid vulnerability. This research is significant as a baseline reference for future studies of grid vulnerability.
Highlights
The power grid is an important urban infrastructure that supports the regular operation of a city and ensures the normal functioning of people’s daily lives
It is difficult to quantify the vulnerability of a power grid to earthquake damage because of its complexity
Most previous studies have used a single indicator of grid vulnerability, which shows that only one perspective of vulnerability is taken into account
Summary
The power grid is an important urban infrastructure that supports the regular operation of a city and ensures the normal functioning of people’s daily lives. Urban development increases both dependence on the power grid and the magnitude of loss and damage caused by large-scale failures. Measures to deal with disasters can be divided into pre-disaster damage prevention and preparation, and post-disaster rescue and repair. Post-disaster rescue and repair is always necessary, it is not enough to respond to a disaster only after it happens because the response is costly and its effects are temporary; pre-disaster damage prevention and preparation can contribute to more lasting security. Vulnerability assessment is a major earthquake damage prevention measure for power grids [1]
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