A conservative control strategy for variable-speed stall-regulated wind turbines

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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 extracted by 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. ... continued below

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Muljadi, E.; Pierce, K. & Migliore, P. February 8, 2000.

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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 extracted by 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 and power 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.

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  • 19th American Society of Mechanical Engineers (ASME) Wind Energy Symposium, Reno, NV (US), 01/10/2000--01/13/2000

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  • Report No.: NREL/CP-500-24791
  • Grant Number: AC36-99GO10337
  • Office of Scientific & Technical Information Report Number: 754586
  • Archival Resource Key: ark:/67531/metadc709617

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  • February 8, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • March 31, 2016, 6:12 p.m.

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Muljadi, E.; Pierce, K. & Migliore, P. A conservative control strategy for variable-speed stall-regulated wind turbines, article, February 8, 2000; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc709617/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.