Polymer Mooring Component for Offshore Renewable Energy

P. McEvoy, E. Johnston
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引用次数: 1

Abstract

The paper presents a cost benefit analysis of using polymer mooring components in the mooring system design of the Maine Aqua Ventus I (MAV1) floating offshore wind turbine (FOWT) project. Polymer components in mooring lines can offer new mooring system responses, which can be tailored to the needs of challenging mooring systems. For FOWT deployments these can deliver mooring system responsiveness at the thrust loads of the turbine, despite the high background mooring loads. MAV1 will deploy two 6MW floating offshore wind turbines off the coast of Maine and this paper compares the existing mooring system design against a polymer mooring component solution, undertaking dynamic analysis of the mooring systems across multiple sea states (including ultimate limit states, fatigue limit states and accidental limit states). The Aqua Ventus platform is modelled in Orcaflex, with multiple mooring system designs containing different polymer component responses modelled and contrasted. Results are analyzed and load analysis data used to undertake a cost benefit analysis. Cost reductions are shown across the mooring system (anchors, lines, connectors), as well as the platform and tower structures. Fatigue analysis is undertaken using a Rainflow analysis of the sea states to be experienced by the platform over its life, for both the existing and the polymer mooring configurations. Polymer mooring components which can be used throughout the renewable energy and offshore industries to manage mooring loads, and are capable of mooring any sized platform, in any challenging conditions. While the specific components modelled in this work are targeted at FOWT or tidal platforms with novel stress-strain response curves designed to suit the high background thrust load conditions, other component responses are available to deliver design load and fatigue reductions on existing catenary or TLP moored platforms. Components can be easily retrofitted into existing mooring lines or deployed in new lines. Using polymer mooring components can dramatically reduce the peak loads experienced by the platform. Previous work has looked at an OC4 FOWT model in hypothetic conditions, whereas the current paper presents new work related to a real US FOWT deployment. The paper demonstrates that >50% reductions in design loads are possible. Cyclic loads are also substantially reduced, resulting in >60% reduction in wave induced fatigue in extreme sea states. This results in operational and maintenance cost savings. The patented mooring components have been developed initially for aquaculture and wave energy applications and have now been scaled to the MN loads required by the FOWT and offshore industries. Components are certified to relevant standards and delivered to projects globally.
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用于海上可再生能源的聚合物系泊组件
本文介绍了在缅因州Aqua Ventus I (MAV1)浮式海上风力发电机(FOWT)项目的系泊系统设计中使用聚合物系泊部件的成本效益分析。系泊缆绳中的聚合物组件可以提供新的系泊系统响应,可以根据具有挑战性的系泊系统的需求进行定制。对于fot部署,尽管背景系泊载荷很高,但这些系统可以在涡轮机推力载荷下提供系泊系统响应。MAV1将在缅因州海岸部署两台6MW海上浮动风力涡轮机,本文将现有系泊系统设计与聚合物系泊组件解决方案进行比较,对系泊系统在多种海况下(包括极限状态、疲劳极限状态和意外极限状态)进行动态分析。Aqua Ventus平台是在Orcaflex中建模的,包含不同聚合物成分响应的多个系泊系统设计进行了建模和对比。结果分析和负荷分析数据用于进行成本效益分析。整个系泊系统(锚、缆绳、连接件)以及平台和塔结构的成本都有所降低。对于现有和聚合物系泊配置,使用Rainflow分析平台在其使用寿命期间所经历的海况,进行疲劳分析。聚合物系泊组件可用于整个可再生能源和海上工业,以管理系泊负载,并且能够在任何具有挑战性的条件下系泊任何大小的平台。虽然在这项工作中建模的特定组件是针对FOWT或潮汐平台的,具有新颖的应力-应变响应曲线,旨在适应高背景推力载荷条件,但其他组件响应可用于现有悬链线或张力腿平台的设计载荷和疲劳减少。组件可以很容易地改装到现有的系泊缆绳或部署在新的缆绳。使用聚合物系泊组件可以显著降低平台承受的峰值载荷。之前的工作研究了假设条件下的OC4 FOWT模型,而当前的论文提出了与真实的美国FOWT部署相关的新工作。本文论证了设计载荷降低50%以上是可能的。循环载荷也大大减少,在极端海况下,波浪引起的疲劳减少了60%以上。这样可以节省操作和维护成本。专利系泊组件最初是为水产养殖和波浪能应用而开发的,现在已经扩展到FOWT和海上工业所需的MN载荷。组件通过相关标准认证,并交付给全球的项目。
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