Improved Thévenin equivalent methods for real-time voltage stability assessment

Angel Perez, Hjörtur Jóhannsson, Jacob Østergaard, Mevludin Glavic, Thierry Van Cutsem

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


An improved Thévenin equivalent method for real-time voltage stability assessment that uses wide-area information from synchrophasors is proposed. The improvements are a better modeling of the limited synchronous generators, and a processing that anticipates the effect of field current limiters, before the latter are activated. Several study cases using detailed dynamic simulations of the Nordic test system have been used to assess the performance of the proposed improvements. Their effectiveness is analyzed and, based on the results, their possible application in combination with the sensitivity-based voltage stability assessment method is explored.
Original languageEnglish
Title of host publicationProceedings of 2016 IEEE International Energy Conference
Number of pages6
Publication date2016
Publication statusPublished - 2016
Event2016 IEEE International Energy Conference - KU Leuven , Leuven , Belgium
Duration: 4 Apr 20168 Apr 2016


Conference2016 IEEE International Energy Conference
LocationKU Leuven
Internet address


  • power system stability
  • phasor measurement
  • sensitivity-based method
  • improved Thévenin equivalent methods
  • real-time voltage stability assessment
  • wide-area information
  • synchrophasors
  • synchronous generators
  • Nordic test system
  • Generators
  • Power system stability
  • Stability criteria
  • Sensitivity
  • Voltage control
  • Phasor measurement units
  • sensitivity analysis
  • Wide-area monitoring
  • voltage stability
  • real-time instability detection
  • Thévenin equivalent
  • stability limit
  • overexcitation limiters
  • Computer Networks and Communications
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Sensitivity analysis
  • Stability
  • System stability
  • Instability detections
  • Over excitation limiters
  • Stability limit
  • Study case
  • Test systems
  • Voltage stability assessment
  • Wide area information
  • Wide area monitoring
  • Voltage stabilizing circuits
  • Power system control
  • Power system measurement and metering


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