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• W3023594465 abstract "Power-law distributed cascade failures are well known in power-grid systems. Understanding this phenomena has been done by various DC threshold models, self-tuned at their critical point. Here we attempt to describe it using an AC threshold model, with a second-order Kuramoto type equation of motion of the power-flow. We have focused on the exploration of network heterogeneity effects, starting from homogeneous 2D lattices to the US power-grid, possessing identical nodes and links, to a realistic electric power-grid obtained from the Hungarian electrical database. The last one exhibits node dependent parameters, topologically marginally on the verge of robust networks. We show that too weak quenched heterogeneity, coming solely from the probabilistic self-frequencies of nodes (2D lattice) is not sufficient to find power-law distributed cascades. On the other hand too strong heterogeneity destroys the synchronization of the system. We found agreement with the empirically observed power-law failure size distributions on the US grid, as well as on the Hungarian networks near the synchronization transition point. We have also investigated the consequence of replacing the usual Gaussian self-frequencies to exponential distributed ones, describing renewable energy sources. We found a drop in the steady state synchronization averages, but the cascade size distribution both for the US and Hungarian systems remained insensitive and have kept the universal tails, characterized by the exponent $tausimeq 1.8$. We have also investigated the effect of an instantaneous feedback mechanism in case of the Hungarian power-grid." @default.
• W3023594465 created "2020-05-13" @default.
• W3023594465 creator A5002721807 @default.
• W3023594465 creator A5039705583 @default.
• W3023594465 date "2020-06-16" @default.
• W3023594465 modified "2023-10-16" @default.
• W3023594465 title "Power-Law Distributions of Dynamic Cascade Failures in Power-Grid Models" @default.
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• W3023594465 doi "https://doi.org/10.3390/e22060666" @default.
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• W3023594465 hasPublicationYear "2020" @default.
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