Risk based voltage security assessment

Hua Wan, James D. McCalley, Vijay Vittal

Research output: Contribution to journalArticlepeer-review

166 Scopus citations


The objective of this paper is to provide a risk-based approach to security assessment for a voltage stability constrained power system. It is motivated by a perception that today's deterministic reliability criteria to voltage stability assessment often results in operating restrictions that are not commensurate with the corresponding level of risk. The risk calculation provided in this paper accounts for both the future uncertainties on the system and the consequences associated with voltage collapse and violation of limits. Although the main purpose of this paper is to provide a method of evaluation, we also give an introduction to show how this reliability leading indicator penetrates the traditional rigid reliability boundary and how it may be used to price reliability in order to make a trade off between reliability and economics.

Original languageEnglish (US)
Pages (from-to)1247-1254
Number of pages8
JournalIEEE Transactions on Power Systems
Issue number4
StatePublished - 2000
Externally publishedYes


  • Impact
  • Load margin sensitivity
  • Power system security
  • Probability
  • Risk assessment
  • Transmission
  • Voltage collapse

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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