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TOPOLOGY AND CASCADING LINE OUTAGES IN POWER GRIDS

Journal of Systems Science and Systems Engineering 2007年第2期16卷 202-221页

作者： David L. PEPYNE University of Massachusetts Amherst MA USA

Motivated by the small world network research of Watts ＆ Strogatz, this paper studies relationships between topology and cascading line outages in electric power grids. Cascading line outages are a type of cascading collapse that can occur in power grids when the transmission network is congested. It is characterized by a self-sustaining sequence of line outages followed by grid breakup, which generally leads to widespread blackout. The main findings of this work are twofold： On one hand, the work suggests that topologies with more disorder in their interconnection topology tend to be robust with respect to cascading line outages in the sense of being able to support greater generation and demand levels than more regularly interconnected topologies. On the other hand, the work suggests that topologies with more disorder tend to be more fragile in that should a cascade get started, they tend to break apart after fewer outages than more regularly interconnected topologies. Thus, as has been observed in other complex networks, there appears to be a tradeoff between robustness and fragility. These results were established using synthetically generated power grid topologies and verified using the IEEE 57 bus and 188 bus power grid test cases.

关键词： Power grid blackout cascading line failure complex networks robust yet fragile

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Modeling and Analysis of Collaboration Network in Large-scale Complex Software Systems

Modeling and Analysis of Collaboration Network in Large-scal...

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第三十届中国控制会议

作者： SUN Shiwen~(1,2),XIA Chengyi~(1,2),WANG Li~(1,2) 1.School of Computer and Communication Engineering,Tianjin University of Technology,Tianjin,300384,P.R.China 2.Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology,Tianjin University of Technology, Tianjin,300384,P.R.China

＜正＞Large-scale software systems represent an important class of artificial complex systems,which can be investigated from the complex network *** on the collaboration network model,the collaboration relationships between header files from source code of large-scale computer software systems are *** has been found that the generated network displays a high degree of heterogeneity in *** structural heterogeneity also leads to network’s another important feature-"robust yet fragile".That is the network displays an unexpected degree of robustness to random attack or disturbance,but is extremely vulnerable to intentional attack,*** the removal of a few of highly connected *** findings can help people to get a better understanding of the organizational principles and evolving mechanism of complex software systems.

关键词： Complex Network Collaboration Network Heterogeneous Connectivity Attack robust yet fragile

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