Dynamic Assessment of Resilience of Power Transmission Systems in Ice Disasters

This paper presents a dynamic resilience assessment method, which can evaluate the impact of ice disasters on power transmission systems based on their actual location and strength. According to the meteorological law of sleet formation and the mechanical law of transmission lines during breakages and the collapse of towers, power transmission lines and tower outage models are developed through mathematical statistics methods. A fragility curve is used to express the relationship between the failure probability of components of transmission systems and weather intensity. A cell partition method is proposed to analyze the manner in which ice disasters would affect the operation of power transmission systems. The sequential Monte Carlo simulation is applied to calculate resilience indexes. The proposed method is demonstrated using an IEEE 6-bus Reliability Test System under four cases of different resilience enhancement measures. The results highlight the systems' resilience during ice disasters and how resilience enhancement measures would affect the system.