Damage measurements on the NWTC direct-drive, variable-speed test bed

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The NWTC (National Wind Technology Center) Variable-Speed Test Bed turbine is a three-bladed, 10-meter, downwind machine that can be run in either fixed-speed or variable-speed mode. In the variable-speed mode, the generator torque is regulated, using a discrete-stepped load bank to maximize the turbine`s power coefficient. At rated power, a second control loop that uses blade pitch to maintain rotor speed essentially as before, i.e., using the load bank to maintain either generator power or (optionally) generator torque. In this paper, the authors will use this turbine to study the effect of variable-speed operation on blade damage. Using time-series data ... continued below

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8 p.

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Sutherland, H.J. & Carlin, P.W. December 31, 1998.

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  • Sutherland, H.J. Sandia National Lab., Albuquerque, NM (United States)
  • Carlin, P.W. National Renewable Energy Lab., Golden, CO (United States)

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The NWTC (National Wind Technology Center) Variable-Speed Test Bed turbine is a three-bladed, 10-meter, downwind machine that can be run in either fixed-speed or variable-speed mode. In the variable-speed mode, the generator torque is regulated, using a discrete-stepped load bank to maximize the turbine`s power coefficient. At rated power, a second control loop that uses blade pitch to maintain rotor speed essentially as before, i.e., using the load bank to maintain either generator power or (optionally) generator torque. In this paper, the authors will use this turbine to study the effect of variable-speed operation on blade damage. Using time-series data obtained from blade flap and edge strain gauges, the load spectrum for the turbine is developed using rainflow counting techniques. Miner`s rule is then used to determine the damage rates for variable-speed and fixed-speed operation. The results illustrate that the controller algorithm used with this turbine introduces relatively large load cycles into the blade that significantly reduce its service lifetime, while power production is only marginally increased.

Physical Description

8 p.

Notes

OSTI as DE98000923

Source

  • 17. ASME wind energy symposium, Reno, NV (United States), 12-15 Jan 1998

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  • Other: DE98000923
  • Report No.: SAND--97-2590C
  • Report No.: CONF-980104--
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 560811
  • Archival Resource Key: ark:/67531/metadc690527

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Creation Date

  • December 31, 1998

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 13, 2016, 1:19 p.m.

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Sutherland, H.J. & Carlin, P.W. Damage measurements on the NWTC direct-drive, variable-speed test bed, article, December 31, 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc690527/: accessed August 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.