Evaluation of time delay effects to wide area power system stabilizer design

Hongxia Wu, Konstantinos Tsakalis, Gerald Thomas Heydt

Research output: Contribution to journalArticlepeer-review

375 Scopus citations


Centralized control using system-wide data has been suggested to enhance the dynamic performance of large interconnected power systems. Because of the distance involved in wide-area interconnections, communication delay cannot be ignored. Long time delay may be detrimental to system stability and may degrade system performance. The time delay tolerance of a centralized controller and the associated performance tradeoff is analyzed using a small gain criterion. Special attention is paid to the choice of weighting functions in a robust control design. As expected, it is found that time delay tolerance decreases when the system bandwidth increases, while the nominal system time-domain performance is concomitantly improved. Several approaches which can maintain a good system performance while increasing the time delay tolerance are suggested and compared. A modern controller design technique, like gain scheduling via linear matrix inequalities, is evaluated for the design of the supervisory power system stabilizer accounting for various time delays.

Original languageEnglish (US)
Pages (from-to)1935-1941
Number of pages7
JournalIEEE Transactions on Power Systems
Issue number4
StatePublished - Nov 2004


  • Gain scheduling
  • Linear matrix inequality (LMI)
  • Power system stabilizer (PSS)
  • Robust control
  • Small gain theorem
  • Time delay
  • Wide-area

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


Dive into the research topics of 'Evaluation of time delay effects to wide area power system stabilizer design'. Together they form a unique fingerprint.

Cite this