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Blade-pitch system for tidal current turbines with reduced variation pitch control strategy based on tidal current velocity preview

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  • Gu, Ya-jing
  • Lin, Yong-gang
  • Xu, Quan-kun
  • Liu, Hong-wei
  • Li, Wei

Abstract

A collective pitch control system is designed using a rack and pinion gear set and hydraulic drive to provide an available blade pitch angle from 0° to 180°. This response accounts for the tidal current bi-directionality caused by flood and ebb under the moon's gravitational force. A front-installed hydraulic cylinder drives the rack-and-pinion system to synchronously turn the blades. Mechanisms are designed to overcome the difficulties of an outer hydraulic oil being deposited into the rotary hub and the pitch angle detection in a rotary hub. This simple and compact structure in a narrow hub reduces current blocking. Experimental results demonstrate that the pitch system has excellent dynamic characteristics. A tidal current velocity preview (CVP) method is proposed to overcome the difficulty of current velocity detection at the rotary impeller. Sealing is important for these underwater conditions. Hence, a reduced variation pitch control strategy is proposed based on CVP to reduce pitch action, which decreases mechanical wear of the sealing structure while extending the tidal current turbine's working life. Comparative results are obtained by using both an approximate sinusoidal current velocity data set simulating periods of real flow and a sea trial measured data set containing highly-turbulent and velocity-sheared flow in a semi-physical test. This test validated the significant reduction of pitch action and relatively high efficiency for energy generation.

Suggested Citation

  • Gu, Ya-jing & Lin, Yong-gang & Xu, Quan-kun & Liu, Hong-wei & Li, Wei, 2018. "Blade-pitch system for tidal current turbines with reduced variation pitch control strategy based on tidal current velocity preview," Renewable Energy, Elsevier, vol. 115(C), pages 149-158.
    • Handle: RePEc:eee:renene:v:115:y:2018:i:c:p:149-158
    DOI: 10.1016/j.renene.2017.07.034
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    References listed on IDEAS

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    1. Liu, Hong-wei & Ma, Shun & Li, Wei & Gu, Hai-gang & Lin, Yong-gang & Sun, Xiao-jing, 2011. "A review on the development of tidal current energy in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(2), pages 1141-1146, February.
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    2. Nachtane, M. & Tarfaoui, M. & Goda, I. & Rouway, M., 2020. "A review on the technologies, design considerations and numerical models of tidal current turbines," Renewable Energy, Elsevier, vol. 157(C), pages 1274-1288.
    3. Wang, Kunlin & Sheng, Songwei & Zhang, Yaqun & Ye, Yin & Jiang, Jiaqiang & Lin, Hongjun & Huang, Zhenxin & Wang, Zhenpeng & You, Yage, 2019. "Principle and control strategy of pulse width modulation rectifier for hydraulic power generation system," Renewable Energy, Elsevier, vol. 135(C), pages 1200-1206.
    4. Danyang Li & Yajing Gu & Hongwei Liu & Yonggang Lin & Jiajun Song & Yongdong Shu, 2023. "Multi-Degree-of-Freedom Load Reproduction by Electrohydraulic Digital-Servo Loading for Wind Turbine Drivetrain," Energies, MDPI, vol. 16(12), pages 1-20, June.
    5. Teng, Yiming & Hu, Dewen & Wu, Feng & Zhang, Ridong & Gao, Furong, 2020. "Fast economic model predictive control for marine current turbine generator system," Renewable Energy, Elsevier, vol. 166(C), pages 108-116.

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