基于耦合策略的相依网络级联故障研究

RESEARCH ON CASCADING FAILURES OF INTERDEPENDENT NETWORKS BASED ON COUPLING STRATEGY

随着基础设施网络的不断扩大,使得网络之间的相依性不断增加,导致相依网络系统中发生的级联故障较为严重。对此,本文提出了一个在相依网络系统中研究级联故障的理论框架,其中考虑了层内和层间的级联故障的影响,探究了跨层网络元件之间的不同耦合方式,即相依方式对级联故障的动态影响。通过利用提出的理论框架,对三种有代表性的耦合方式,即随机耦合、"低到高"耦合和"高到高"耦合,进行实验比较。结果显示,"高到高"耦合曲线非常接近Sfin=Sinit曲线,其余两个耦合方式在某些情况下导致电网最终级联故障增加了150%,在通信网中更严重;且在相依网络为一对一耦合模型下,两个相依网络节点的耦合方式对级联故障的最终影响程度起着关键作用,与其他形式的相依耦合方式相比,将两个网络的对等节点耦合,即"高到高"耦合所产生的级联故障较小,有效减轻相依网络级联故障的潜在策略。

With the expansion of infrastructure network, the dependence between networks is increasing, which leads to cascade failures in dependent network systems. A theoretical framework for studying cascading failures interdependent network systems was proposed, which considered the effect of cascade faults within and between layers, as well as explored the different coupling modes between network elements across layers, that is the influence of cascading failures on interdependent network. By using the proposed theoretical framework, three representative coupling modes, namely, random coupling, ＇low to High＇ coupling and ＇high to High＇ coupling, are compared experimental. The results show that the ＂high to high＂ coupling curve is very close to the Sfin=Sinit curve, and the other two coupling modes lead to a 150% increasing in the final cascading failures in some cases which is more serious in the communication network. In addition, in the case of one-to-one coupling model of dependent network, the coupling mode of two dependent network nodes plays a key role in the final impact of cascaded faults. Compared with other forms of dependent coupling, the coupling of two network peers, that is ＂high to high＂ coupling mode produced little cascading failures, which can efficiency reduce the potential strategy of cascading failures in dependent networks.