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

近年来，随着固定海上风电在欧洲的相对成功和LCOE的下降，浮式海上风电技术引起了人们的极大兴趣。从油气行业继承来的几个平台概念被提出作为海上风力涡轮机的浮动子结构。这些平台包括半潜式平台、梁式平台和张力腿式平台，前者激发了迄今为止最先进的概念。半潜式平台主要通过浮力来抵抗动载荷，与之相比，张力腿平台是一种不太柔顺的系统，通过其预张紧的肌腱来抵抗动力。虽然这减轻了平台船体的重量，但最关键的设计组件之一是了解系泊系统中的极端负载条件。因此，开发能够准确识别极端设计条件的数值模型对于TLP概念的开发和验证至关重要。Bachysnki[1]，[2]最近的研究表明，包括和频率二阶力和三阶环载荷对于捕获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，法国电力公司一直致力于改进其内部的水-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）可能发展的技术。

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).