Numerical Investigations on Suspended Power Cable Configurations for Floating Offshore Wind Turbines in Deep Water Powering an FPSO

Schnepf, Anja; Devulder, Aymeric; Johnsen, Øyvind; Ong, Muk Chen; Lopez-Pavon, Carlos

doi:10.1115/1.4057006

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…Furthermore, the design value of the current will influence the design of the electric cables between the individual wind turbines [17,18] and the transformer station [19] , where the electricity generated by the wind turbines is transformed from alternating current (AC) to direct current (DC) to limit energy loss during transport to shore. Functioning cables are crucial for the profit of a wind farm, and the risk of damage must be minimized.…”

Section: Currents At the Offshore Sitementioning

confidence: 99%

Design Basis Considerations for the Design of Floating Offshore Wind Turbines

Gudmestad,

Schnepf

2023

SUSTAIN MAR STRUCT

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The wind farm owner/operator must prepare a Design Basis to facilitate the design of floating offshore wind turbines. The Design Basis is crucial to ensure that the individual elements of the wind farm are designed according to the relevant standards and the actual site conditions. In case of under-design, systematic failures can occur across the wind turbines, which can result in progressive damage to the turbines of the wind farm. This paper focuses on the safety and overall economics, including limiting potential excessive costs of heavy maintenance caused by damage due to under-design. Thus, this paper highlights critical aspects of particular importance to be implemented in the Design Basis document. Meeting all required constraints for developing offshore wind farms in deep water may result in higher costs than initially anticipated. Nonetheless, a realistic cost estimation for all phases of the project, engineering, construction, transport, and installation on site, remains essential for all engineering projects, including those involving renewable energy.

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Section: Currents At the Offshore Sitementioning

confidence: 99%

Design Basis Considerations for the Design of Floating Offshore Wind Turbines

Gudmestad,

Schnepf

2023

SUSTAIN MAR STRUCT

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“…This configuration incorporates typical ancillary equipment like bend stiffeners and buoyancy modules, simulating multiple configurations, including lazy wave, steep wave, and tethered wave. Schnepf et al [6] established a numerical model for suspended cables in FOWTs, employing a fully suspended arrangement where the entire cable floats in the water column, avoiding contact with the seabed or water surface. In a separate investigation by Schnepf et al [7], they compared configurations utilizing buoyancy modules and those utilizing buoys, highlighting that the minimum bending radius for buoyancy modules is superior to that of buoys.…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of a Suspended Inter-Array Power Cable between Two Spar-Type Floating Wind Turbines: Evaluating the Influence of Buoy Element Failure on the Cable

Liu,

Janocha,

Ahmad

et al. 2024

JMSE

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The suspended configuration of inter-array power cables between floating offshore wind turbines necessitates using various ancillary equipment, such as buoy elements and bend stiffeners, to maintain the desired cable geometry. The failure analysis is an important step in the design of an inter-array dynamic power cable layout. This study investigates the impact of buoy element failures on the structural integrity and fatigue life of inter-array power cable configurations in offshore environments, focusing on four environmental conditions representative of the North Sea. Utilizing numerical simulations and fatigue analysis in OrcaFlex, static and dynamic analyses are conducted to assess maximum tension, minimum bend radius (MBR), and fatigue life under single and two failure scenarios of buoy elements. The results indicate that single buoy failures significantly increase maximum tension at hang-off points. At the same time, MBR is found to be the smallest at the failure position, aiding in failure point identification. In addition, for the two buoy element failure scenarios, the maximum tension increase poses risks to structural integrity, while MBR and fatigue life have high sensitivity to the applied environmental conditions.

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“…Moreover, there is currently limited research on this type of suspended cable configuration, especially concerning the experimental aspects. Schnepf et al (2023) [10] analyzed the different configurations of suspended dynamic cable tension between the FOWT and FPSO in deep water. Beier et al (2023) [11] presented dynamic cable fatigue results for two spar-type FOWTs.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Suspended Inter-Array Cable Configurations for Floating Offshore Wind Farm

Li,

Su,

Yang

2024

JMSE

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The present study evaluates the feasibility of using a fully suspended inter-array cable system for an offshore wind farm. It includes both numerical simulations and a scaled-down experiment, conducted at a 1:49 scale, to validate the numerical results. To achieve the goal, a 15 MW floating offshore wind turbine (FOWT) and a floating offshore substation (FOSS) are involved to simulate the wind farm array. This study incorporates the 50-year return period conditions of the Taiwan Hsinchu offshore area, which has a water depth of about 100 m, to validate the specifications related to the platform motion and mooring line tension. Additionally, an analysis of the tension, curvature, and fatigue damage of the dynamic cable system is discussed in this research. Because a fully suspended cable is a relatively new concept and may be more frequently considered in a deeper water depth area, numerical simulation software Orcina Orcaflex 11.4 has been chosen to conduct the fully coupled simulation, determining whether the fully suspended cable system could effectively withstand the challenges posed by extreme sea conditions. This is due to the reason that a fully suspended cable would occupy a larger space in the ocean, which may pose a risk by influencing the navigation of the vessels. Therefore, the cable laying depth under normal sea states is also discussed to evaluate the influence over vessel navigation. This study also collects the long-term environmental data from the Central Weather Bureau, Taiwan, to calculate the accumulative cable fatigue damage under different sea states. To integrate the results, this research applies fitness parameters to evaluate the feasibility of each cable configuration. Covering the cable performance under extreme sea states and regular operating sea states offers valuable insights for applications in ocean engineering.

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Numerical Investigations on Suspended Power Cable Configurations for Floating Offshore Wind Turbines in Deep Water Powering an FPSO

Cited by 6 publications

References 20 publications

Design Basis Considerations for the Design of Floating Offshore Wind Turbines

Design Basis Considerations for the Design of Floating Offshore Wind Turbines

Failure Analysis of a Suspended Inter-Array Power Cable between Two Spar-Type Floating Wind Turbines: Evaluating the Influence of Buoy Element Failure on the Cable

Experimental and Numerical Study of Suspended Inter-Array Cable Configurations for Floating Offshore Wind Farm

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