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Detection of Subsynchronous Torsional Oscillation Frequencies Using Phasor Measurement

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Original languageEnglish
Pages (from-to)11-19
JournalIEEE Transactions on Power Delivery
Issue number1
Early online date2015
Publication statusPublished - 2016
Publication typeA1 Journal article-refereed


This paper presents a non-invasive and easy to implement technique using phasor measurement units for accurate estimation of subsynchronous torsional frequencies. This information is relevant for the optimal design of HVDC subsynchronous damping controllers that enhance the effect of HVDC on subsynchronous damping. The method is rigorously justified using mathematical proofs as well as thorough EMT simulations. The method was implemented in the Finnish transmission network and proved to be effective.


  • Damping, Frequency measurement, Frequency modulation, Generators, Observability, Oscillators, Stators, HVDC, PMU, SSO, Subsynchronous oscillations, phasor measurement, power system measurements, subsynchronous damping controllers, torsional oscillations

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