Impedance Measurement of Wind Turbines using a Multimegawatt Grid Simulator: Preprint

Research output: Contribution to conferencePaper


This paper presents the impedance measurements of a 4 MW wind turbine conducted using a multimegawatt grid simulator at the National Renewable Energy Laboratory in Colorado, United States. This paper describes different systems, including a 7 MVA grid simulator, a 5 MW dynamometer, a medium-voltage measurement system, and a real-time control system used for the automated impedance measurement of a utility-scale wind turbine. Different aspects of impedance measurement are discussed, including the selection of the magnitude of injected perturbation, measurement of frequency cross-coupling between the sequence impedance responses, and the alignment of the reference frame for sequence impedance measurement. The paper also demonstrates high-fidelity validation of an EMT simulation model of the wind turbine using impedance measurements.
Original languageAmerican English
Number of pages9
StatePublished - 2019
Event18th Wind Integration Workshop - Dublin, Ireland
Duration: 16 Oct 201918 Oct 2019


Conference18th Wind Integration Workshop
CityDublin, Ireland

NREL Publication Number

  • NREL/CP-5D00-74890


  • control interactions
  • grid simulator
  • impedance measurement
  • oscillations
  • resonance
  • stability
  • wind turbines


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