Derivation and application of sensitivities to assess transient voltage sags caused by rotor swings

Johannes Tilman Gabriel Weckesser, Hjörtur Jóhannsson, Jacob Østergaard, Thieery Van Cutsem

Research output: Contribution to journalJournal articleResearchpeer-review


The paper introduces an approach to investigate voltage sags, which are caused by large generator rotor swings following a transient disturbance. Therefore, the method exploits sensitivities derived from the algebraic network equations. These provide information on the impact of a generator on the voltage magnitude at a load bus and the effect of load variation on the generator’s power injection. It is shown that these sensitivities give valuable information to identify critical generator–load pairs and locations for applying preventive control measures.
Original languageEnglish
JournalInternational Journal of Electrical Power & Energy Systems
Issue numberSpecial Issue
Pages (from-to)75-82
Publication statusPublished - 2015


  • Power system stability
  • Sensitivity to rotor swings
  • Transient stability
  • Voltage sag


SOSPO: Secure Operation of Sustainable Power Systems

Østergaard, J., Jóhannsson, H., Nielsen, A. H., Garcia-Valle, R., Yang, G., Lind, M., Blanke, M., Weckesser, J. T. G., Wittrock, M. L., Møller, J. G., Perez, A., Pedersen, A. S. & Zhang, X.


Project: Research


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