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Open AccessArticle

Experimental Research for Stabilizing Offshore Floating Wind Turbines

1
School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
2
School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China
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School of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
4
School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(10), 1947; https://doi.org/10.3390/en12101947
Received: 6 March 2019 / Revised: 10 May 2019 / Accepted: 14 May 2019 / Published: 21 May 2019
(This article belongs to the Special Issue Power System for Offshore Renewable Energy)
Floating turbines are attracting increasing interest today. However, the power generation efficiency of a floating turbine is highly dependent on its motion stability in sea water. This issue is more marked, particularly when the floating turbines operate in relatively shallow water. In order to address this issue, a new concept motion stabilizer is studied in this paper. It is a completely passive device consisting of a number of heave plates. The plates are connected to the foundation of the floating wind turbine via structural arms. Since the heave plates are completely, rather than partially, exposed to water, all surfaces of them can be fully utilized to create the damping forces required to stabilize the floating wind turbine. Moreover, their stabilizing effect can be further amplified due to the application of the structural arms. This is because torques will be generated by the damping forces via the structural arms, and then applied to stabilizing the floating turbine. To verify the proposed concept motion stabilizer, its practical effectiveness on motion reduction is investigated in this paper. Both numerical and experimental testing results have shown that after using the proposed concept stabilizer, the motion stability of the floating turbine has been successfully improved over a wide range of wave periods even in relatively shallow water. Moreover, the comparison has shown that the stabilizer is more effective in stabilizing the floating wind turbine than single heave plate does. This suggests that the proposed concept stabilizer may provide a potentially viable solution for stabilizing floating wind turbines. View Full-Text
Keywords: offshore wind; floating wind turbine; motion stability; cost of energy offshore wind; floating wind turbine; motion stability; cost of energy
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MDPI and ACS Style

Yang, W.; Tian, W.; Hvalbye, O.; Peng, Z.; Wei, K.; Tian, X. Experimental Research for Stabilizing Offshore Floating Wind Turbines. Energies 2019, 12, 1947.

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