Experimental and Numerical analysis of a Floating Offshore Wind Turbine in waves and wind

近年来，随着固定海上风能在欧洲各地的相对成功和LCOE的下降，漂浮海上风能技术引起了人们的极大兴趣。从O&G行业继承下来的几个平台概念已经被提出作为海上风力涡轮机的浮动底座。这些平台包括半潜式、单柱式和张力腿(TLP)型平台，前者启发了迄今为止最先进的概念。与主要通过浮力抵抗动态载荷的半潜式平台相比，TLP是通过其预张力筋抵抗动态力的柔度较低的系统。虽然这减轻了平台船体的重量，但最关键的设计组成部分之一是了解系泊系统中的极端载荷条件。因此，开发准确识别极端设计条件的数值模型在TLP概念的开发和验证中至关重要。Bachysnki[1]，[2]最近的研究表明，包括和频二阶力和三阶振铃载荷对于捕捉平台系泊设计中至关重要的极端正负(松弛)事件非常重要。根据这项研究，EDF一直在改进其内部水-空气动力学模拟软件CHALYPSO，以评估在地中海、东北大西洋和可能的北海(英国)可能开发的技术。

Floating Offshore Wind technologies have gathered a significant amount of interest in recent years following the relative success of fixed offshore wind across Europe and the decrease in its LCOE. Several platform concepts inherited from the O&G industry have been proposed as floating substructure for offshore wind turbines. These include semi-submersible, spar and tension-legged (TLP) type platform, the former having inspired the most advanced concepts to date.Compared to semi-submersible which resist dynamic loading mostly through their buoyancy, TLPs are less compliant systems resisting dynamic forces through their pre-tensioned tendons. Whilst this reduces the weight of the platform hull, one of the most critical design component becomes the understanding of extreme loading conditions in the mooring system. Therefore, developing numerical models that accurately identify extreme design conditions is critical in the development and validation of TLP concepts. Recent research by Bachysnki [1], [2] has shown that including sum-frequency second order forces and third order ringing loads are important to capture extreme positive and negative (slacking) events critical in the design of the platform moorings.In light of this research, EDF has been working on improving its in-house hydro-aerodynamic simulation software, CHALYPSO, in order to evaluate technologies for possible development in the Mediterranean, North-East Atlantic and possibly North-Sea (UK).