Monitoring of inter-area oscillations under ambient conditions using subspace identification

M. Larsson, Dina Shona Laila

Research output: Contribution to conferencePaper

58 Citations (Scopus)


The damping of inter-area oscillations is a major concern for many power system operators. This paper presents a novel method for monitoring of inter-area oscillations based on system identification using subspace techniques and modal analysis. The method enables the detection of oscillatory modes as well as the damping and frequency of those from ambient data recorded during normal operation of the power system. Through modal observability which is also estimated, the parts of the grid participating in an oscillation mode can be determined. The method is suitable for real-time implementation. The paper demonstrates application of the method to measurements from the Nordic power system and to synthetic data. The technique can be used to increase operator situational awareness and provide early warning in case of potential for unstable inter-area mode oscillations.
Original languageEnglish
Publication statusPublished - 2 Oct 2009
EventIEEE Power & Energy Society General Meeting - Calgary, Canada
Duration: 26 Jul 200930 Jul 2009


ConferenceIEEE Power & Energy Society General Meeting

Bibliographical note

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  • Condition monitoring
  • Power system dynamics
  • Power system measurements
  • Damping
  • Observability
  • Power measurement
  • Power system analysis computing
  • System identification
  • Modal analysis
  • Power system protection
  • power system protection
  • modal analysis
  • phase measurement
  • power system dynamic stability
  • power system identification
  • power system measurement
  • phasor measurement unit
  • interarea oscillation monitoring
  • ambient conditions
  • subspace identification techniques
  • power system operator
  • system identification
  • oscillatory mode detection
  • Nordic power system measurement
  • WAMS
  • power system monitoring
  • inter-area oscillation
  • wide-area measurement system


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