Abstract
The frequent occurrence of natural disasters and malicious attacks has exerted unprecedented disturbances on power systems, accounting for the extensive attention paid to power system resilience. Combined with the evolving nature of general disasters, this paper proposes resilience assessment approaches for power systems under a tri-stage framework. The pre-disaster toughness is proposed to quantify the robustness of power systems against potential disasters, where the thinking of area division and partitioned multi-objective risk method (PMRM) is introduced. In the case of information deficiency caused by disasters, the during-disaster resistance to disturbance is calculated to reflect the real-time system running state by state estimation (SE). The post-disaster restoration ability consists of response ability, restoration efficiency and restoration economy, which is evaluated by Sequential Monte-Carlo Simulation to simulate the system restoration process. Further, a synthetic metric system is presented to quantify the resilience performance of power systems from the above three aspects. The proposed approaches and framework are validated on the IEEE RTS 79 system, and helpful conclusions are drawn from extensive case studies.
Highlights
Maintaining a high level of power supply reliability is one of the main requirements for power systems
Resilience of power system has emerged as a novel concept to resist the damage from various
Resilience of power system has emerged as a novel concept to resist the damage from disasters
Summary
Maintaining a high level of power supply reliability is one of the main requirements for power systems. Panteli [20] innovatively proposed the concept of the multi-phase resilience trapezoid, and quantified the resilience of power systems based on the stages of disturbance process, post-disturbance degraded state and restorative state. Existing resilience assessments, which are usually conducted before disasters, tend to regard the response, adaption and restoration process of power systems as a whole. These approaches cannot totally demonstrate the advantages of multi-stage resilience assessment, and the key problems of each stage cannot be revealed thoroughly. To consider the multi-stage characteristics of power system resilience, we divide the resilience assessment into three components: pre-disaster system toughness, during-disaster system resistance and post-disaster system restoration ability.
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