Power System Response to a Large Disturbance: Energy Associated with System Separation

A. A. Fouad, Vijay Vittal

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Formulating the power system equations with respect to the system's inertial center, it is shown that a large disturbance tends to pull each generator from the rest of the generators, forming a two-machine equivalent. The energy associated with this equivalent is related to the energy function for individual machines, previously developed by the authors. Parameters of the two-machine equivalent are derived for any generator versus the rest of the system. Based on the two-machine equivalent concept, transient stability assessment of a multimachine power system is made, and a criterion for identifying the machines likely to separate from the system (by loss of synchronism) and the energy associated with this separation is developed. The criterion is applied successfully to a 17-generator power system.

Original languageEnglish (US)
Pages (from-to)3534-3540
Number of pages7
JournalIEEE transactions on power apparatus and systems
Issue number11
StatePublished - Nov 1983
Externally publishedYes

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Engineering(all)
  • Electrical and Electronic Engineering


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