Conservative Control Strategy for Variable-Speed Stall-Regulated Wind Turbines

Research output: Contribution to conferencePaper


Simulation models of a variable-speed, fixed-pitch wind turbine were investigated* to evaluate the feasibility of constraining rotor speed and power output without the benefit of active aerodynamic control devices. A strategy was postulated to control rotational speed by specifying the demanded generator torque. By controlling rotor speed in relation to wind speed, the aerodynamic power extractedby the blades from the wind was manipulated. Specifically, the blades were caused to stall in high winds. In low and moderate winds, the demanded generator torque and the resulting rotor speed were controlled to cause the wind turbine to operate near maximum efficiency. Using the developed models, simulations were conducted of operation in turbulent winds. Results indicated that rotor speed andpower output were well regulated. Preliminary investigations of system dynamics showed that, compared to fixed-speed operation, variable-speed operation caused cyclic loading amplitude to be reduced for the turbine blades and low-speed shaft and slightly increased for the tower loads. This result suggests a favorable impact on fatigue life from implementation of the proposed control strategy.
Original languageAmerican English
Number of pages10
StatePublished - 2000
Event19th American Society of Mechanical Engineers (ASME) Wind Energy Symposium - Reno, Nevada
Duration: 10 Jan 200013 Jan 2000


Conference19th American Society of Mechanical Engineers (ASME) Wind Energy Symposium
CityReno, Nevada

NREL Publication Number

  • NREL/CP-500-24791


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