Stability Analysis of a Variable-Speed Wind Turbine

Gunjit S. Bir, Alan D. Wright, C. P. Sandy Butterfield

Research output: Contribution to conferencePaperpeer-review

10 Scopus Citations


This paper examines the elastomechanical stability of a four-bladed wind turbine over a specific rotor speed range. Stability modes, frequencies, and dampings are extracted using a specialized modal processor developed at NREL that post-processes the response data generated by the ADAMS’ simulation code. The processor can analyze a turbine with an arbitrary number of rotor blades and offers a novel capability of isolating stability modes that become locked at a single frequency. Results indicate that over a certain rotor speed range, the tower lateral mode and the rotor regressive in-plane mode coalesce, resulting in a self-excited instability. Additional results show the effect of tower and nacelle parameters on the stability boundaries.

Original languageAmerican English
Number of pages12
StatePublished - 1997
Event35th Aerospace Sciences Meeting and Exhibit, 1997 - Reno, United States
Duration: 6 Jan 19979 Jan 1997


Conference35th Aerospace Sciences Meeting and Exhibit, 1997
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 1997 by the American Institute of Aeronautics and Astronautics. All rights reserved.

NREL Publication Number

  • NREL/CP-23289


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