A new methodology for upscaling semi-submersible platforms for floating offshore wind turbines

IF 3.6 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Kaylie L. Roach, M. Lackner, J. Manwell
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Abstract

Abstract. This paper presents a new upscaling methodology for semi-submersible floating offshore wind turbine platforms. The size and power rating of offshore wind turbines have been growing in recent years, with modern wind turbines rated at 10–18 MW in contrast with 2–5 MW in 2010. It is not apparent how much further wind turbine size can be increased before it is unjustified. Scaling relations are a useful method for analyzing wind turbine designs to understand the mass, load, and cost increases with size. Scaling relations currently do not exist but are needed for floating offshore platforms to understand how the technical and economic development of floating offshore wind energy may develop with increasing turbine size. In this paper, a hydrodynamic model has been developed to capture the key platform response in pitch. The hydrodynamic model is validated using OpenFAST, a high-fidelity offshore wind turbine simulation software. An upscaling methodology is then applied to two semi-submersible case studies of reference systems (the Offshore Code Comparison Collaboration Continuation (OC4) 5 MW and the International Energy Agency (IEA) 15 MW). For each case study, the platform pitch angle at rated wind turbine thrust is constrained to a specified value. The results show that platform dimensions scale to a factor of 0.75, and the platform steel mass scales to a factor of 1.5 when the wall thickness is kept constant. This study is the first to develop generalized upscaling relations that can be used for other triangular semi-submersible platforms that have three outer columns with the turbine mounted at the center of the system. This is in contrast with other studies that upscale a specific design to a larger power rating. This upscaling methodology provides new insight into trends for semi-submersible platform upscaling as turbine size increases.
提升浮式海上风力涡轮机半潜式平台的新方法
摘要本文介绍了一种新的半潜式浮动海上风力涡轮机平台升级方法。近年来,海上风力涡轮机的尺寸和额定功率不断增长,现代风力涡轮机的额定功率为 10-18 兆瓦,而 2010 年仅为 2-5 兆瓦。目前尚不清楚风力涡轮机的尺寸还能增加多少才算合理。比例关系是分析风力涡轮机设计的有用方法,可用于了解质量、负载和成本随尺寸的增加而增加。目前还不存在比例关系,但海上浮动平台需要这种关系,以了解随着涡轮机尺寸的增大,海上浮动风能的技术和经济发展会如何发展。本文开发了一个水动力模型,以捕捉平台在变桨时的关键响应。使用高保真海上风力涡轮机仿真软件 OpenFAST 对水动力模型进行了验证。然后,将升级方法应用于两个半潜式参考系统案例研究(离岸规范比较合作继续(OC4)5 兆瓦和国际能源机构(IEA)15 兆瓦)。在每个案例研究中,额定风力涡轮机推力下的平台俯仰角都被限制在指定值内。结果表明,在壁厚保持不变的情况下,平台尺寸的缩放系数为 0.75,平台钢质量的缩放系数为 1.5。这项研究首次提出了通用的升级关系,可用于其他有三个外柱、涡轮机安装在系统中心的三角形半潜式平台。这与其他将特定设计放大到更大额定功率的研究不同。随着涡轮机尺寸的增加,这种升级方法为半潜式平台的升级趋势提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Wind Energy Science
Wind Energy Science GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY-
CiteScore
6.90
自引率
27.50%
发文量
115
审稿时长
28 weeks
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