Multi-Hazard Risk Assessment of Electric Power Systems Subjected To Seismic and Hurricane Hazards

Abstract eng:
Electric power systems are susceptible to damage due to natural hazards such as earthquakes, hurricanes, flooding, and storm surges. Among these hazards, earthquakes and hurricanes are the most damaging to power systems. Considerable effort have been made to develop methodologies for assessing the reliability of critical civil infrastructure systems such as electric power systems under single hazards such as earthquakes or hurricanes. However, there are parts of the world that are vulnerable to both seismic and hurricane hazards. In such regions, more accurate risk assessment is only possible when focus is shifted from single-hazard to multi-hazard analysis. There is therefore a need to develop methods for quantifying the risk posed by combined effect of multiple hazards on infrastructure systems in these regions. This is essential for predisaster decision making regarding strengthening of existing systems. This paper presents a framework for multi-hazard risk assessment of electric power systems subjected to earthquakes and hurricanes. Parts of the framework include hazard analysis, component fragility, system reliability analysis, and multi-hazard risk assessment. For the hazard analysis, a probabilistically weighted deterministic hazard scenarios approach is also employed to overcome the limitations of scenario-based and probabilistic hazard analysis approach for spatially distributed infrastructure systems. A notional electric power network assumed to be located in Charleston and New York is used to demonstrate the proposed framework.

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