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The impact of pitch-to-stall and pitch-to-feather control on the structural loads and the pitch mechanism of a wind turbine

Arash Ebneali Samani (UGent) , Jeroen De Kooning (UGent) , Nezmin Kayedpour (UGent) , Narender Singh (UGent) and Lieven Vandevelde (UGent)
(2020) ENERGIES. 13(17).
Author
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Abstract
This article investigates the impact of the pitch-to-stall and pitch-to-feather control concepts on horizontal axis wind turbines (HAWTs) with different blade designs. Pitch-to-feather control is widely used to limit the power output of wind turbines in high wind speed conditions. However, stall control has not been taken forward in the industry because of the low predictability of stalled rotor aerodynamics. Despite this drawback, this article investigates the possible advantages of this control concept when compared to pitch-to-feather control with an emphasis on the control performance and its impact on the pitch mechanism and structural loads. In this study, three HAWTs with different blade designs, i.e., untwisted, stall-regulated, and pitch-regulated blades, are investigated. The control system is validated in both uniform and turbulent wind speed. The results show that pitch-to-stall control enhances the constant power control for wind turbines with untwisted and stall-regulated blade designs. Stall control alleviates the fore-aft tower loading and the blades flapwise moment of the wind turbine with stall-regulated blades in uniform winds. However, in turbulent winds, the flapwise moment increases to a certain extent as compared to pitch-to-feather control. Moreover, pitch-to-stall control considerably reduces the summed blade pitch movement, despite that it increases the risk of surface damage in the rolling bearings due to oscillating movements with a small amplitude.
Keywords
pitch-to-stall, pitch-to-feather, pitch mechanism, structural loads, LOSSES, DESIGN

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MLA
Ebneali Samani, Arash, et al. “The Impact of Pitch-to-Stall and Pitch-to-Feather Control on the Structural Loads and the Pitch Mechanism of a Wind Turbine.” ENERGIES, vol. 13, no. 17, 2020, doi:10.3390/en13174503.
APA
Ebneali Samani, A., De Kooning, J., Kayedpour, N., Singh, N., & Vandevelde, L. (2020). The impact of pitch-to-stall and pitch-to-feather control on the structural loads and the pitch mechanism of a wind turbine. ENERGIES, 13(17). https://doi.org/10.3390/en13174503
Chicago author-date
Ebneali Samani, Arash, Jeroen De Kooning, Nezmin Kayedpour, Narender Singh, and Lieven Vandevelde. 2020. “The Impact of Pitch-to-Stall and Pitch-to-Feather Control on the Structural Loads and the Pitch Mechanism of a Wind Turbine.” ENERGIES 13 (17). https://doi.org/10.3390/en13174503.
Chicago author-date (all authors)
Ebneali Samani, Arash, Jeroen De Kooning, Nezmin Kayedpour, Narender Singh, and Lieven Vandevelde. 2020. “The Impact of Pitch-to-Stall and Pitch-to-Feather Control on the Structural Loads and the Pitch Mechanism of a Wind Turbine.” ENERGIES 13 (17). doi:10.3390/en13174503.
Vancouver
1.
Ebneali Samani A, De Kooning J, Kayedpour N, Singh N, Vandevelde L. The impact of pitch-to-stall and pitch-to-feather control on the structural loads and the pitch mechanism of a wind turbine. ENERGIES. 2020;13(17).
IEEE
[1]
A. Ebneali Samani, J. De Kooning, N. Kayedpour, N. Singh, and L. Vandevelde, “The impact of pitch-to-stall and pitch-to-feather control on the structural loads and the pitch mechanism of a wind turbine,” ENERGIES, vol. 13, no. 17, 2020.
@article{8673159,
  abstract     = {{This article investigates the impact of the pitch-to-stall and pitch-to-feather control concepts on horizontal axis wind turbines (HAWTs) with different blade designs. Pitch-to-feather control is widely used to limit the power output of wind turbines in high wind speed conditions. However, stall control has not been taken forward in the industry because of the low predictability of stalled rotor aerodynamics. Despite this drawback, this article investigates the possible advantages of this control concept when compared to pitch-to-feather control with an emphasis on the control performance and its impact on the pitch mechanism and structural loads. In this study, three HAWTs with different blade designs, i.e., untwisted, stall-regulated, and pitch-regulated blades, are investigated. The control system is validated in both uniform and turbulent wind speed. The results show that pitch-to-stall control enhances the constant power control for wind turbines with untwisted and stall-regulated blade designs. Stall control alleviates the fore-aft tower loading and the blades flapwise moment of the wind turbine with stall-regulated blades in uniform winds. However, in turbulent winds, the flapwise moment increases to a certain extent as compared to pitch-to-feather control. Moreover, pitch-to-stall control considerably reduces the summed blade pitch movement, despite that it increases the risk of surface damage in the rolling bearings due to oscillating movements with a small amplitude.}},
  articleno    = {{4503}},
  author       = {{Ebneali Samani, Arash and De Kooning, Jeroen and Kayedpour, Nezmin and Singh, Narender and Vandevelde, Lieven}},
  issn         = {{1996-1073}},
  journal      = {{ENERGIES}},
  keywords     = {{pitch-to-stall,pitch-to-feather,pitch mechanism,structural loads,LOSSES,DESIGN}},
  language     = {{eng}},
  number       = {{17}},
  pages        = {{21}},
  title        = {{The impact of pitch-to-stall and pitch-to-feather control on the structural loads and the pitch mechanism of a wind turbine}},
  url          = {{http://doi.org/10.3390/en13174503}},
  volume       = {{13}},
  year         = {{2020}},
}

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