Impedance Characterization of Utility-Scale Renewable Energy and Storage Systems: Preprint

Research output: Contribution to conferencePaper


This paper presents the impedance characterization of utility-scale wind turbines and PV/storage inverters using a multimegawatt grid simulator-based grid integration testbed. The paper describes testbed components including a 7 MVA grid simulator, 5 MW dynamometer, medium-voltage measurement system, and real-time control system used for automated impedance characterization of wind turbines and inverters. Different aspects of impedance measurement are discussed, including the selection of the magnitude and type of perturbation, measurement of frequency cross-coupling between sequence impedance responses, and the alignment of the reference frame for sequence impedance measurement. The paper also demonstrates high-fidelity validation of EMT simulation models and characterization of grid-forming inverters using impedance measurements.
Original languageAmerican English
Number of pages11
StatePublished - 2019
Event2019 Energy Conversion Congress and Exposition (IEEE ECCE) - Baltimore, Maryland
Duration: 29 Sep 20193 Oct 2019


Conference2019 Energy Conversion Congress and Exposition (IEEE ECCE)
CityBaltimore, Maryland

Bibliographical note

See NREL/CP-5D00-75853 for paper as published in IEEE proceedings

NREL Publication Number

  • NREL/CP-5D00-73173


  • control interactions
  • impedance measurement
  • impedance measurements
  • renewable generation
  • resonance
  • stability
  • storage


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