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Reliability engineering & system safety v.160, 2017년, pp.89 - 97   SCI SCIE SCOPUS
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AC power flow importance measures considering multi-element failures

Li, Jian (Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, China Academy of Safety Science and Technology, Beijing 100012, PR China ); Dueñas-Osorio, Leonardo (Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA ); Chen, Changkun (Institute of Disaster Prevention Science and Safety Technology, Central South University, Changsha, Hunan 410075, PR China ); Shi, Congling (Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, China Academy of Safety Science and Technology, Beijing 100012, PR China );
  • 초록  

    Abstract Quantifying the criticality of individual components of power systems is essential for overall reliability and management. This paper proposes an AC-based power flow element importance measure, while considering multi-element failures. The measure relies on a proposed AC-based cascading failure model, which captures branch overflow, bus load shedding, and branch failures, via AC power flow and optimal power flow analyses. Taking the IEEE 30, 57 and 118-bus power systems as case studies, we find that N -3 analyses are sufficient to measure the importance of a bus or branch. It is observed that for a substation bus, its importance is statistically proportional to its power demand, but this trend is not observed for power plant buses. While comparing with other reliability, functionality, and topology-based importance measures popular today, we find that a DC power flow model, although better correlated with the benchmark AC model as a whole, still fails to locate some critical elements. This is due to the focus of DC-based models on real power that ignores reactive power. The proposed importance measure is aimed to inform decision makers about key components in complex systems, while improving cascading failure prevention, system backup setting, and overall resilience. Highlights We propose a novel importance measure based on joint failures and AC power flow. A cascading failure model considers both AC power flow and optimal power flow. We find that N -3 analyses are sufficient to measure the importance of an element. Power demand impacts the importance of substations but less so that of generators. DC models fail to identify some key elements, despite correlating with AC models.


  • 주제어

    AC power flow .   N-k reliability .   Importance ranking .   Cascading failure .   Functional reliability.  

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