Stability Analysis of a Variable-Speed Wind Turbine

Research output: Contribution to conferencePaper


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 ADAMS1 simulation code. The processor can analyze a turbine with an arbitrary number of rotor blades and offers anovel 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 pages14
StatePublished - 1996
Event1997 ASME Wind Energy Symposium - Reno, Nevada
Duration: 6 Jan 19979 Jan 1997


Conference1997 ASME Wind Energy Symposium
CityReno, Nevada

NREL Publication Number

  • NREL/CP-440-21679


  • turbines
  • variable speed
  • wind


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