Voltage stability indices for stressed power systems

P. A. Löf, G. Andersson, D. J. Hill

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182 Citations (Scopus)


This paper presents and discusses the use of static voltage stability indices based on a singular value decomposition of the power flow Jacobian matrix and matrices derived from the Jacobian matrix. It is shown that such indices, together with the singular vectors, contain substantial and important information about the proximity to voltage instability and also about critical buses and disturbances from a voltage instability point of view. This is done by a theoretical analysis of the linearized power flow equations and an analysis from model power systems as well as realistic power systems (1033 nodes). It is argued that indices based on these matrices are useful for the system analyst in planning and operations planning.

Original languageEnglish
Pages (from-to)326-335
Number of pages10
JournalIEEE Transactions on Power Systems
Issue number1
Publication statusPublished - Feb 1993
Externally publishedYes

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