Voltage security enhancement using energy based sensitivities

Thomas J. Overbye, Christopher L. DeMarco

Research output: Contribution to journalArticlepeer-review


This paper uses an energy based security measure to define vulnerability to voltage instability, and proposes a method of security enhancement by examining the sensitivity of the security margin to various control actions. The use of the energy function in systems with significant line losses is reviewed, and the analytic expressions for first order total derivatives with respect to relevant control parameters derived. Computational properties, such as sparsity of various vector and matrix quantities, are examined. Numerical examples of security enhancement based on these sensitivities are computed for a thirty bus example system. Potential application of this approach within a security constrained optimal power flow is also discussed.

Original languageEnglish (US)
Pages (from-to)1196-1202
Number of pages7
JournalIEEE Transactions on Power Systems
Issue number3
StatePublished - Aug 1991
Externally publishedYes


  • Voltage stability
  • energy functions
  • optimal power flow
  • security enhancement
  • voltage collapse

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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