Design of Controls to Attenuate Loads in the Controls Advanced Research Turbine: Preprint

Research output: Contribution to conferencePaper


Designing wind turbines to maximize energy production and increase fatigue life is a major goal of the wind industry. To achieve this goal, we must design wind turbines to extract maximum energy and reduce component and system loads. This paper applies modern state-space control design methods to a two-bladed teetering-hub upwind machine located at the National Wind Technology Center*. The designobjective is to regulate turbine speed in region 3 (above rated wind speed) and enhance damping in several low-damped flexible modes of the turbine. The controls approach is based on the Disturbance Accommodating Control (DAC) method and provides accountability for wind-speed disturbances. First, controls are designed using the single control input rotor collective pitch to stabilize the firstdrive-train torsion as well as the tower first fore-aft bending modes. Generator torque is then incorporated as an additional control input. This reduces some of the demand placed on the rotor collective pitch control system and enhances first drive train torsion mode damping. Individual blade pitch control is then used to attenuate wind disturbances having spatial variation over the rotor andeffectively reduces blade flap deflections caused by wind shear.
Original languageAmerican English
Number of pages14
StatePublished - 2003
Event2004 ASME Wind Energy Symposium - Reno, Nevada
Duration: 5 Jan 20048 Jan 2004


Conference2004 ASME Wind Energy Symposium
CityReno, Nevada

NREL Publication Number

  • NREL/CP-500-35084


  • induction generator
  • power systems
  • renewable energy (RE)
  • synchronous generator
  • wind farm
  • wind turbine controls
  • wind turbine design methods
  • wind turbine speed regulation turbine


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