Interdependence among voltage-unstable buses during cascading failure in power systems

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Number of pages11
Journal / PublicationIEEE Transactions on Circuits and Systems I: Regular Papers
Online published11 Jul 2024
Publication statusOnline published - 11 Jul 2024

Abstract

In this paper, we demonstrate the interdependence among buses in power systems that experience voltage instability events by deriving interaction graphs through successive transition probability matrices and the Markov transition matrix. A quasi-stationary convergence has been observed in the probability transition matrices, suggesting a pattern in voltage instability failure. We propose algorithms to identify the pattern, referred to as fault chains, by tracing the interaction graphs. The interaction graphs and fault chains can be used to formulate strategies for enhancing network robustness, including the assignment of new photovoltaic buses, load rescheduling, and equipping droop controllers. Numerical experiments performed on the IEEE 118-and 300-bus systems demonstrate that equipping droop controllers at selected buses is an effective approach for improving network robustness. © 2024 IEEE.

Research Area(s)

  • Power system, cascading failure, complex network, fault chain, voltage collapse