Damping Wind and Wave Loads on a Floating Wind Turbine
Damping Wind and Wave Loads on a Floating Wind Turbine
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DOI：
10.3390/en6084097
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发表时间：
2013-08
期刊：
影响因子：
3.2
通讯作者：
S. Christiansen;T. Bak;T. Knudsen
中科院分区：
文献类型：
--
作者：
S. Christiansen;T. Bak;T. Knudsen
海上风能利用海上更高和更少的湍流风速。为了能够在深水位置部署风力涡轮机，正在探索将风力涡轮机放置在浮动平台上的结构。这种组合结构提出了一个新的控制问题，由于部分无约束的运动平台和海浪的激励。如果这种额外的复杂性没有得到适当的处理，这可能会导致结构载荷的显著增加，并可能导致受控系统的不稳定性。在本文中，波浪激励进行了研究，我们显示的影响，风速，波浪频率和风和波浪之间的错位对系统动力学。推导出一种新的控制模型，该模型扩展了标准涡轮机模型，以包括流体动力学、附加平台自由度、平台系泊系统和塔架侧-侧运动（包括陀螺效应）。这些模型支持基于模型的设计，其中包括风速和波频的估计器。该设计应用于代表不同的风和波浪条件的一些例子，并成功地证明了减少结构振荡，同时提高功率性能。
Offshore wind energy capitalizes on the higher and less turbulent wind speeds at sea. To enable deployment of wind turbines in deep-water locations, structures are being explored, where wind turbines are placed on a floating platform. This combined structure presents a new control problem, due to the partly unconstrained movement of the platform and ocean wave excitation. If this additional complexity is not dealt with properly, this may lead to a significant increase in the structural loads and, potentially, instability of the controlled system. In this paper, the wave excitation is investigated, and we show the influence that both wind speed, wave frequencies and misalignment between wind and waves have on the system dynamics. A new control model is derived that extends standard turbine models to include the hydrodynamics, additional platform degrees of freedom, the platform mooring system and tower side-side motion, including gyroscopic effects. The models support a model-based design that includes estimators for wind speed and wave frequency. The design is applied to a number of examples representing different wind and wave conditions and successfully demonstrates a reduction in the structural oscillations, while improving power performance.