Online risk-based security assessment

Ming Ni, James D. McCalley, Vijay Vittal, Tayyib Tayyib

Research output: Contribution to journalArticlepeer-review

431 Scopus citations


The work described in this paper was motivated by a perceived increase in the frequency at which power system operators are encountering high stress in bulk transmission systems and the corresponding need to improve security monitoring of these networks. Online risk-based security assessment provides rapid online quantification of a security level associated with an existing or forecasted operating condition. One major advantage of this approach over deterministic online security assessment is that it condenses contingency likelihood and severity into indices that reflect probabilistic risk. Use of these indices in control room decision making leads to increased understanding of potential network problems, including overload, cascading overload, low voltages, and voltage instability, resulting in improved security-related decision making. Test results on large-scale transmission models retrieved from the energy-management system of a U.S. utility company are described.

Original languageEnglish (US)
Pages (from-to)258-265
Number of pages8
JournalIEEE Transactions on Power Systems
Issue number1
StatePublished - Feb 2003
Externally publishedYes


  • Cascading
  • Control center
  • Decision making
  • Operations
  • Overload
  • Probabilistic risk
  • Security assessment
  • Uncertainty
  • Voltage instability

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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