Some Preliminary Results from the NWTC Direct-Drive, Variable-Speed Test Bed

Research output: Contribution to conferencePaper


With the remarkable rise in interest in variable-speed operation of larger wind turbines, it has become important for the National Wind Technology Center (NWTC) to have access to a variable-speed test bed that can be specially instrumented for research. Accordingly, a three-bladed, 10-meter, downwind, Grumman Windstream machine has been equipped with a set of composite blades and adirect-coupled, permanent-magnet, 20 kilowatt generator. This machine and its associated control system and data collection system are discussed. Several variations of a maximum power control algorithm have been installed on the control computer. To provide a baseline for comparison, several constant speed algorithms have also been installed. The present major effort is devoted to daytime,semi-autonomous data collection.
Original languageAmerican English
Number of pages11
StatePublished - 1996
Event1997 ASME/AIAA Wind Energy Symposium - Reno, Nevada
Duration: 6 Jan 19979 Jan 1997


Conference1997 ASME/AIAA Wind Energy Symposium
CityReno, Nevada

NREL Publication Number

  • NREL/CP-440-21678


  • turbines
  • variable speed
  • wind


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