Investigation of modal interaction and its effects on control performance in stressed power systems using normal forms of vector fields

Chih Ming Lin, V. Vittal, W. Kliemann, A. A. Fouad

Research output: Contribution to journalArticlepeer-review

114 Scopus citations


This paper presents a systematic scheme to evaluate nonlinear modal interaction in a power system with excitation control and determine the effect of the interaction on control performance using the normal forms of vectors fields. The proposed approach has been applied to a two-area, four-generator system. The results obtained showed that the control modes have significant interaction with the inertial modes, especially with the so-called interarea modes. The nonlinear interaction between modes following the excitation of certain specific modes could result in a detrimental effect on control performance when the controls are designed based on purely linear analysis.

Original languageEnglish (US)
Pages (from-to)781-787
Number of pages7
JournalIEEE Transactions on Power Systems
Issue number2
StatePublished - 1996
Externally publishedYes


  • Excitation control
  • Interarea mode
  • Modal interaction
  • Normal forms
  • Power system stability

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this