Apparent impedance correlation of transient energy margin and time simulation

V. Vittal, T. Oh, A. A. Fouad

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


This paper deals with the development of a procedure to relate the transient energy margin of a multi-machine power system to the apparent impedance of a line protected by an out-of-step relay. In this procedure, only the multi-machine system parameters are used, and the conventional intermediate step of forming a two-machine equivalent is eliminated. A technique for generating the swing impedance locus is also described. The method is tested for a loss of generation disturbance on a 23-generator equivalent of the Florida Power & Light Co. network. The results obtained are compared with time simulation results.

Original languageEnglish (US)
Pages (from-to)455-462
Number of pages8
JournalIEEE Transactions on Power Systems
Issue number2
StatePublished - May 1988
Externally publishedYes

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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