Extensive assessment about the efficiency and quality of the power production is important to the floating wind turbine (FWT) development. The power performance of a wind turbine depends on turbine dynamics, control strategy, and atmospheric conditions. As for FWTs, the additional floater oscillations should be particularly incorporated. In this paper, extensive simulations are conducted for a Spar-type FWT using the FAST software. The relative wind velocity introduced by floater oscillations and the corresponding power capture mechanisms are analyzed in detail. A concept of equivalent turbulence intensity is proposed to generally describe the intensity of floater oscillation. It is observed to satisfyingly serve as an independent variable for FWT power production. The mapping relationship between the FWT power generation and the equivalent turbulence intensity is constructed. Results show that the FWT output power increases linearly with the equivalent turbulence intensity square in the below-rated region, while it is well regulated around the rated power by the bladepitch controller in the above-rated region. The normalized power fluctuation augments linearly with equivalent turbulence intensity over the whole operating wind speeds except the rated-nearby region. The findings are potentially helpful for the power forecasting, controller development, economical evaluation, and wind farm optimizations.

中文翻译：

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浮动风力涡轮机功率性能包括由浮子振荡引起的等效湍流强度

对发电效率和质量的广泛评估对于浮动风力涡轮机 (FWT) 的发展非常重要。风力涡轮机的功率性能取决于涡轮机动力学、控制策略和大气条件。对于 FWT，应特别纳入额外的浮子振荡。在本文中，使用 FAST 软件对 Spar 型 FWT 进行了广泛的模拟。详细分析了浮子振荡引入的相对风速和相应的功率捕获机制。提出等效湍流强度的概念来概括描述漂浮物振荡的强度。观察到它令人满意地用作 FWT 发电的自变量。构建了FWT发电量与等效湍流强度的映射关系。结果表明，FWT输出功率在额定值以下区域随等效湍流强度平方线性增加，而在额定值以上区域通过桨距控制器在额定功率附近很好地调节。归一化功率波动在除额定附近区域外的整个运行风速上随等效湍流强度线性增加。这些发现可能有助于功率预测、控制器开发、经济评估和风电场优化。而在额定功率以上的区域，通过桨距控制器在额定功率附近进行了很好的调节。归一化功率波动在除额定附近区域外的整个运行风速上随等效湍流强度线性增加。这些发现可能有助于功率预测、控制器开发、经济评估和风电场优化。而在额定功率以上的区域，通过桨距控制器在额定功率附近进行了很好的调节。归一化功率波动在除额定附近区域外的整个运行风速上随等效湍流强度线性增加。这些发现可能有助于功率预测、控制器开发、经济评估和风电场优化。