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arXiv 1712.04053physics.soc-phnlin.AO
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作为连续相空间跃迁的级联故障

Cascading Failures as Continuous Phase-Space Transitions

Yang Yang, Adilson E. Motter

摘要:

在网络系统中,局部扰动会随着传播而放大,可能导致大规模级联故障。在这里,我们推导出一个连续的模型,以促进我们的理解,在电网网络的连锁故障。该模型考虑了输电线路的故障和发电机的失稳,并结合了级联的连续步骤之间的瞬态动力学。在这个框架下,我们表明,级联事件是一个相空间的过渡,从一个平衡态具有高能量的平衡态具有较低的能量,它可以适当地描述在封闭的形式,使用一个整体的哈密顿函数。从这个功能,我们表明,扰动系统不能总是达到准稳态级联模型,这将对应于减少故障数量预测的平衡态,而可能会经历一个更大的级联。我们还表明,在存在两个或两个以上的扰动,结果强烈依赖于个别扰动的顺序和时间。这些结果提供了新的见解,目前的理解级联动态,控制干预措施的潜在影响。

英文摘要:

In network systems, a local perturbation can amplify as it propagates, potentially leading to a large-scale cascading failure. Here we derive a continuous model to advance our understanding of cascading failures in power-grid networks. The model accounts for both the failure of transmission lines and the desynchronization of power generators, and incorporates the transient dynamics between successive steps of the cascade. In this framework, we show that a cascade event is a phase-space transition from an equilibrium state with high energy to an equilibrium state with lower energy, which can be suitably described in closed form using a global Hamiltonian-like function. From this function we show that a perturbed system cannot always reach the equilibrium state predicted by quasi-steady-state cascade models, which would correspond to a reduced number of failures, and may instead undergo a larger cascade. We also show that in the presence of two or more perturbations, the outcome depends strongly on the order and timing of the individual perturbations. These results offer new insights into the current understanding of cascading dynamics, with potential implications for control interventions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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