Estimation of Eastern Denmark’s Electromechanical Modes from Ambient Phasor Measurement Data

Luigi Vanfretti, Rodrigo Garcia-Valle, Kjetil Uhlen, Emil Johansson, Daniel Trudnowski, John W. Pierre, Joe H. Chow, Olof Samuelsson, Jacob Østergaard, Kenneth E. Martin

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


In this paper we report on the preliminary results of a collaborative investigation effort between researchers in North America and Europe aiming to baseline the electromechanical modes and mode shapes of the Nordic system from synchronized phasor measurement data. We provide an overview on the Danish power grid and its interconnections, and describe the features of an experimental phasor measurement unit designed by DTU which is used to provide the measurements used in this investigation. Parametric and non-parametric block processing techniques are applied to 48 hours of ambient data recorded at the Radsted and Hovegård substations in Eastern Denmark. The estimated modes are in agreement with those shown in eigenanalysis studies, and other measurement-based investigations. More importantly, the emergence of a new 0.8 Hz mode in Sjælland is reported.
Original languageEnglish
Title of host publicationIEEE PES GM 2010 : "Power Systems Engineering in Challenging Times"
Publication date2010
ISBN (Print)978-1-4244-6549-1
ISBN (Electronic)978-1-4244-8357-0
Publication statusPublished - 2010
Event2010 IEEE Power and Energy Society General Meeting - Minneapolis, MN, United States
Duration: 25 Jul 201029 Jul 2010


Conference2010 IEEE Power and Energy Society General Meeting
CountryUnited States
CityMinneapolis, MN
Internet address


  • Power system monitoring
  • Power system identification
  • Power system parameter estimation
  • Synchronized phasor measurements

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