CGI for Impedance Characterization of Inverter-Coupled Generation

Research output: NRELPresentation


This presentation provides an overview of impedance characterization of inverter-coupled generation using the 7 MVA/13.2 kV grid simulator (controllable grid interface) at the National Wind Technology Center of NREL. The presentation shows how sequence impedance responses of multi-megawatt inverters and wind turbines are measured using the grid simulator. Applications of the measured impedance responses for the evaluation of dynamic interactions and high-fidelity model validation are demonstrated. The presentation also shows application of large-signal impedance theory for the prediction of harmonics generated by subsynchronous resonance (SSR) of DFIG-based Type-III wind turbines with series-compensated transmission lines. Finally, a new method for impedance-based characterization of power system frequency response is presented to enable real-time estimation of system inertia and primary frequency response (PFR), and to support control design for frequency support by inverter-coupled generation.
Original languageAmerican English
Number of pages20
StatePublished - 2018

Publication series

NamePresented at the Fifth International Workshop on Grid Simulator Testing, 14-15 November 2018, Tallahassee, Florida

NREL Publication Number

  • NREL/PR-5D00-72899


  • control interactions
  • frequency support
  • grid simulator
  • impedance characterization
  • inertia estimation
  • inverter-coupled generation
  • resonance


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