Experiment investigations of pitch motions for a semi-submersible wind turbine with the passive gyro stabilizers

IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN
Junlei Wang, Haoran Li, Jisheng Zhang, Dawei Guan, Hao Chen, Tao Lu
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引用次数: 0

Abstract

The pitch motion of floating offshore wind turbines (FOWTs) significantly reduces energy conversion efficiency and accelerates fatigue degradation of blades and tower. This study proposes a passive control strategy using gyro stabilizers to mitigate platform pitch instability in a semi-submersible FOWT prototype based on the Tri-floater design. Scaled hydrodynamic model tests were conducted to evaluate the pitch suppression effects under environmental loads (wave height, wave period, wind thrust) and structural parameters of FOWT (column-deck spacing, ballast mass, tower height). The results indicate that gyro stabilizers generate positive damping at wave frequency and negative damping at low frequency. Both damping components increase with the wave height and period, but positive damping escalates more prominently, achieving a 3-times enhancement in pitch reduction under wind-wave combined conditions. Wind thrust amplifies suppression effects until reaching a threshold (2.7 N). For the influence of structural parameters, larger column-deck spacing reduces positive damping at wave frequency while increasing low-frequency negative damping, leading to diminished overall suppression. Additional ballast mass weakens positive damping by 77 %, and tower height elevation slightly enhances the promotion effect of wind load on the active damping at wave frequency, due to increased pitch angular velocity.
带被动陀螺稳定器的半潜式风力机俯仰运动实验研究
浮式海上风力发电机的俯仰运动严重降低了能量转换效率,加速了叶片和塔架的疲劳退化。在基于三浮子设计的半潜式FOWT原型机中,提出了一种使用陀螺稳定器来减轻平台俯仰角不稳定性的被动控制策略。通过比例水动力模型试验,评估了环境荷载(浪高、浪周期、风推力)和结构参数(柱-甲板间距、压载质量、塔架高度)下的俯仰抑制效果。结果表明,陀螺稳定器在波频处产生正阻尼,在低频处产生负阻尼。两种阻尼分量均随波高和周期的增加而增加,但正阻尼的增加更为显著,在风浪组合条件下,俯仰减小量提高了3倍。风推力放大了抑制效果,直到达到阈值(2.7 N)。对于结构参数的影响,较大的柱甲板间距减小了波频处的正阻尼,增加了低频的负阻尼,导致整体抑制减弱。附加的压载质量使正阻尼减弱了77%,塔高标高由于俯仰角速度的增加,使风荷载对波频主动阻尼的促进作用略有增强。
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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
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