Wide-range reliable stabilization of time-delayed power systems

Hisham M. Soliman, Abdellah Benzaouia, Hassan Yousef*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Steam valve control is usually discarded in power system stability due to belief in its slow response. The present manuscript makes use of it as a backup control in the case of failure of the main fast excitation control. The model describing system dynamics as a function of the two controllers, with wide range loading conditions, is derived in a norm-bounded format. Linear matrix inequalities are derived as a sufficient condition to obtain reliable controllers that provide good oscillation damping when both controllers are sound or even in the case of failure of either one. The design scheme is robust in the sense that it keeps reliable stability against wide load changes as well. A single machine infinite bus system is presented to illustrate the proposed design procedure and exhibit its performance. Results of excitation and governor controller testing show that the desired performance could be fulfilled from light load to heavy load conditions. System performance shows a remarkable improvement of dynamic stability by obtaining a well-damped oscillation time response even in the case of failure of either controller. Extension of the proposed controller to multiarea load-frequency control with time delay is also presented.

Original languageEnglish
Pages (from-to)2853-2864
Number of pages12
JournalTurkish Journal of Electrical Engineering and Computer Sciences
Issue number4
Publication statusPublished - 2016


  • Excitation control
  • Linear matrix inequalities
  • Load-frequency control
  • Power system stability
  • Reliable control
  • Robust control
  • Steam valve control
  • Time-delay systems

ASJC Scopus subject areas

  • General Computer Science
  • Electrical and Electronic Engineering


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