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Multistability and variations in basin of attraction in power-grid systems

Title
Multistability and variations in basin of attraction in power-grid systems
Author
손승우
Keywords
power grid; synchronization; basin stability; bifurcation
Issue Date
2018-11
Publisher
IOP PUBLISHING LTD
Citation
NEW JOURNAL OF PHYSICS, v. 20, Article no. 113006
Abstract
Power grids sustain modern society by supplying electricity and thus their stability is a crucial factor for our civilization. The dynamic stability of a power grid is usually quantified by the probability of its nodes' recovery to phase synchronization of the alternating current it carries, in response to external perturbation. Intuitively, the stability of nodes in power grids is supposed to become more robust as the coupling strength between the nodes increases. However, we find a counterintuitive range of coupling strength values where the synchronization stability suddenly droops as the coupling strength increases, on a number of simple graph structures. Since power grids are designed to fulfill both local and long-range power demands, such simple graph structures or graphlets for local power transmission are indeed relevant in reality. We show that the observed nonmonotonic behavior is a consequence of transitions in multistability, which are related to changes in stability of the unsynchronized states. Therefore, our findings suggest that a comprehensive understanding of changes in multistability are necessary to prevent the unexpected catastrophic instability in the building blocks of power grids.
URI
https://iopscience.iop.org/article/10.1088/1367-2630/aae8eb/metahttps://repository.hanyang.ac.kr/handle/20.500.11754/98787
ISSN
1367-2630
DOI
10.1088/1367-2630/aae8eb
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > APPLIED PHYSICS(응용물리학과) > Articles
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