Abstract
Ice disasters have frequently occurred worldwide in recent years, which seriously affected power transmission system operations. To improve the resilience of power grids and minimize economic losses, this paper proposes a framework for assessing the influence of ice disasters on the resilience of power transmission systems. This method considers the spatial–temporal impact of ice disasters on the resilience of power transmission systems, and the contingence set for risk assessment is established according to contingency probabilities. Based on meteorological data, the outage models of power transmission components are developed in the form of generic fragility curves, and the ice load is given by a simplified freezing rain ice model. A cell partition method is adopted to analyze the way ice disasters affect the operation of power transmission systems. The sequential Monte Carlo simulation method is used to assess resilience for capturing the stochastic impact of ice disasters and deriving the contingency set. Finally, the IEEE RTS-79 system is employed to investigate the impact of ice disasters by two case studies, which demonstrate the viability and effectiveness of the proposed framework. In turn, the results help recognize the resilience of the system under such disasters and the effects of different resilience enhancement measures.
Highlights
Extreme events [1,2,3], which are low-probability high-impact, may cause a significant damage to the operational resilience of a power system, leading to wide-area power outages
An ice disaster is simulated for the IEEE RTS-79 system [48], which is used to verify the proposed methodology for resilience evaluation regarding power transmission systems
This paper has proposed a dynamic methodology for assessing the impact of ice disasters on the resilience of power transmission systems, based on a modified resilience metrics (RICD) capable of effectively capturing the characteristics of extreme event
Summary
Extreme events [1,2,3], which are low-probability high-impact, may cause a significant damage to the operational resilience of a power system, leading to wide-area power outages. The effect of ice disasters is increasingly serious on transmission systems, such as the ice storm, which happened in January 1998, hit Eastern Canada and the Northeastern United States and caused 1.4 million households to be affected by power blackouts [4] Another example is the 2008 ice disaster in Southern China that wreaked havoc on power grid equipment and interrupted power supplies in disaster areas, knocking out more than 36,000 transmission lines and affecting 27 million households [2]. These outages reveal that power systems are in dire need of practical solutions to withstand such infrequent, low-probability high-impact events [5]. In terms of the impact of ice disasters on power systems, a two-state weather
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