On the Low Risk of SSR in Type III Wind Turbines Operating in Grid-Forming Control: Preprint

Research output: Contribution to conferencePaper


We have shown in a previous work that the risk of sub-synchronous resonance (SSR) between a wind power plant with Type III wind turbines and series-compensated transmission lines is low when the wind turbines in the plant are operated in grid-forming mode, instead of the standard grid-following mode. The fundamental mechanism behind the improved damping characteristics is explained in this paper by modeling the positive and negative sequence impedances of Type III wind turbines for GFM operation mode. It is discovered that the GFM control naturally acts against the negative resistance of Type III wind turbines that results from an interaction between the proportional gain of the rotor-side converter current controller and negative slip. The developed sequence impedance models and improved damping behavior are verified using PSCAD simulations of a 2.5-MW Type III GFM wind turbine. The modeling predictions are also supported by experimentally measuring the sequence impedance response of a 2.5-MW Type III wind turbine during operation in GFL and GFM modes.
Original languageAmerican English
Number of pages9
StatePublished - 2023
Event21st Wind & Solar Integration Workshop - The Hague, Netherlands
Duration: 12 Oct 202214 Oct 2022


Conference21st Wind & Solar Integration Workshop
CityThe Hague, Netherlands

Bibliographical note

See NREL/CP-5D00-87177 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5D00-83808


  • grid-following turbine
  • grid-forming turbine
  • impedance modeling
  • stability
  • sub-synchronous resonance


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