Small-disturbance angle stability enhancement through direct load control part I - Framework development

Badri Ramanathan, Vijay Vittal

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


This paper is the first of a two-part paper on the application of selective direct control of loads for small-disturbance angle stability enhancement in power systems. The change in the utility business model and developments in enabling technologies open up new possibilities for power system reliability enhancement. This paper proposes preventive modulation of selected loads through direct control for small-disturbance angle stability enhancement. An analysis framework based on the structured singular value theory has been proposed in which the controllable load range at selected buses that satisfies the desired stability robustness performance criterion is determined. Two conceptually different approaches for analysis of load modulation have been presented. Results have been presented on an equivalent of the Western Electric Coordinating Council system in the second part of this paper.

Original languageEnglish (US)
Pages (from-to)773-781
Number of pages9
JournalIEEE Transactions on Power Systems
Issue number2
StatePublished - May 2006


  • Direct load control
  • Robust performance
  • Skewed-μ
  • Small-disturbance angle stability
  • μ-analysis

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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