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Boosting the Power Grid Resilience to Extreme Weather Events Using Defensive Islanding

机译：使用防御性孤岛提高电网对极端天气事件的适应能力

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摘要

Several catastrophic experiences of extreme weather events show that boosting the power grid resilience is becoming increasingly critical. This paper discusses a unified resilience evaluation and operational enhancement approach, which includes a procedure for assessing the impact of severe weather on power systems and a novel risk-based defensive islanding algorithm. This adaptive islanding algorithm aims to mitigate the cascading effects that may occur during weather emergencies. This goes beyond the infrastructure-based measures that are traditionally used as a defense to severe weather. The resilience assessment procedure relies on the concept of fragility curves, which express the weather-dependent failure probabilities of the components. A severity risk index is used to determine the application of defensive islanding, which considers the current network topology and the branches that are at higher risk of tripping due to the weather event. This preventive measure boosts the system resilience by splitting the network into stable and self-adequate islands in order to isolate the components with higher failure probability, whose tripping would trigger cascading events. The proposed approach is illustrated using a simplified version of the Great Britain transmission network, with focus on assessing and improving its resilience to severe windstorms.
机译：几种极端天气事件的灾难性经验表明，提高电网的弹性变得越来越重要。本文讨论了统一的弹性评估和运营增强方法，其中包括评估恶劣天气对电力系统的影响的程序以及基于风险的新型防御孤岛算法。该自适应孤岛算法旨在减轻天气紧急情况下可能发生的级联效应。这超出了传统上用作防御恶劣天气的基于基础设施的措施。弹性评估程序依赖于易碎性曲线的概念，该曲线表示组件的天气相关故障概率。严重性风险指数用于确定防御性孤岛的应用，该防御性孤岛考虑了当前网络拓扑以及因天气事件而跳闸的较高风险的分支机构。这种预防措施通过将网络分成稳定且自足的孤岛，从而隔离具有较高故障概率的组件，从而提高了系统的恢复能力，故障的发生可能触发级联事件。使用简化版的英国输电网络对提议的方法进行了说明，重点是评估和提高其对严重暴风雨的适应能力。

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