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Risk Assessment in Extreme Events Considering the Reliability of Protection Systems

机译:考虑保护系统可靠性的极端事件风险评估

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摘要

This paper presents a new risk assessment method that is applicable to extreme cases in power systems. This paper analyzes the interactions among protection system components and the power grid in extreme events pertaining to simultaneous faults and cascading failures. The hidden failures of protection systems could exacerbate power system conditions if cascading events tend to follow a path to a blackout. The proposed risk assessment considers detailed reliability models of protection system components including circuit breakers (CBs) and protective relays. The failure probability of a CB is formulated considering its component degradation rate and operation times. The failure model of a protective relay is constructed using the dynamic fault tree. The evolution of cascading failures of power systems in extreme conditions, which deteriorates due to protection system malfunctions, is modeled based on the actual physical system behavior. The effectiveness of the proposed risk assessment method is demonstrated using a modified 9-bus system and the IEEE 68-bus system.
机译:本文提出了一种适用于电力系统极端情况的新的风险评估方法。本文分析了与同时故障和级联故障有关的极端事件中保护系统组件与电网之间的相互作用。如果级联事件倾向于遵循停电之路,则保护系统的隐患可能会加剧电力系统的状况。拟议的风险评估考虑了保护系统组件(包括断路器(CB)和保护继电器)的详细可靠性模型。断路器的故障概率是根据其部件退化率和工作时间来制定的。使用动态故障树构造保护继电器的故障模型。基于实际的物理系统行为,对在极端条件下电力系统的级联故障的演变(由于保护系统故障而恶化)进行了建模。使用改进的9总线系统和IEEE 68总线系统证明了所建议的风险评估方法的有效性。

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