Stability analysis of a variable-speed wind turbine

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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 ... continued below

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14 p.

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Bir, G.S.; Wright, A.D. & Butterfield, C.P. October 1, 1996.

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Description

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.

Physical Description

14 p.

Notes

OSTI as DE97000075

Source

  • 16. American Society of Mechanical Engineers wind energy symposium, Reno, NV (United States), 6-9 Jan 1997

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  • Other: DE97000075
  • Report No.: NREL/CP--440-21679
  • Report No.: CONF-970135--12
  • Grant Number: AC36-83CH10093
  • Office of Scientific & Technical Information Report Number: 420360
  • Archival Resource Key: ark:/67531/metadc676279

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  • October 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • March 31, 2016, 5:35 p.m.

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Bir, G.S.; Wright, A.D. & Butterfield, C.P. Stability analysis of a variable-speed wind turbine, article, October 1, 1996; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc676279/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.