Tracing generator coherency indices using the continuation method: A novel approach

Xiaoming Wang, Vijay Vittal, Gerald T. Heydt

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


Slow coherency-based generator grouping in power systems is primarily dependent on the participation of generators in the slow modes. In the literature, generator coherency has been typically obtained at a specific operating point. This paper presents a new approach using the continuation method to trace the loci of the coherency indices of the slow modes in the system with respect to variation in system conditions to obtain the updated coherency information between generators. The approach has been applied to a 10-generator 39-bus New England system, and a 29-generator 179-bus model of the WECC system and the impact of load variation on generator coherency indices has been investigated.

Original languageEnglish (US)
Pages (from-to)1510-1518
Number of pages9
JournalIEEE Transactions on Power Systems
Issue number3
StatePublished - Aug 2005


  • Continuation method
  • Generator coherency indices tracing
  • Power system dynamics
  • Slow coherency based grouping

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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