Early Prevention Method for Power System Instability

Evgenia Dmitrova, Martin Lindholm Wittrock, Hjörtur Jóhannsson, Arne Hejde Nielsen

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This paper presents a method to determine suitable countermeasures against emerging aperiodic small disturbance rotor angle (ASD) instability. The method utilizes stability indicators, computed in real time, to define a criterion for ASD stability. Sensitivities of these stability i ndicators are then determined and used to identify the most in fl uential nodes for counter measures. To increase the computational speed, only nodes visited by a self-propagating graph, rooted at the vulnerable generator, will have their sensitivities calculated. The steady state voltages after a given counter measure are then determined, using a grid transformation coefficient (GTC) and a numerical, iterative solution to an equation system. The stability criteriacan then be assessed to evaluate the sufficiency of a suggested counter measure. The method is demonstrated on a synthetic 8-bus network and a 464-bus model of the Western Denm ark transmission grid. The method successfully demonstrates its ability to efficiently identify and evaluate counter measures for a large, practical system.
Original languageEnglish
JournalIEEE Transactions on Power Systems
Issue number4
Pages (from-to)1784-1792
Number of pages9
Publication statusPublished - 2015


  • Power system control
  • Power System Security
  • Power system simulation
  • Power system stability


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