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

Research output: Contribution to conferencePaperpeer-review

Abstract

We have shown in previous work that the risk of subsynchronous resonance (SSR) between wind power plant with Type III wind turbines and a series-compensated transmission line is low when the wind turbines are operated in grid-forming mode, instead of the standard grid-following mode. This paper explains the fundamental mechanism behind the improved damping characteristics by modeling the positive- and negative-sequence impedances of Type III wind turbines in grid-forming control mode. It is discovered that the grid-forming control naturally acts against the negative resistance behavior of Type III wind turbines at subsynchronous frequencies that results from an interaction between 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 grid-forming wind turbine. The modeling predictions are also supported by experimentally measuring the sequence impedance response of a 2.5-MW Type III wind turbine in grid-forming control mode.

Original languageAmerican English
Pages74-79
Number of pages6
DOIs
StatePublished - 2022
Event21st Wind and Solar Integration Workshop, WIW 2022 - Hybrid, The Hague, Netherlands
Duration: 12 Oct 202214 Oct 2022

Conference

Conference21st Wind and Solar Integration Workshop, WIW 2022
Country/TerritoryNetherlands
CityHybrid, The Hague
Period12/10/2214/10/22

Bibliographical note

See NREL/CP-5D00-83808 for preprint

NREL Publication Number

  • NREL/CP-5D00-87177

Keywords

  • grid-following control
  • grid-forming control
  • impedance modeling
  • stability
  • Subsynchronous resonance

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