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dc.contributor.advisorGiljarhus, Knut Erik Teigen
dc.contributor.advisorGudmestad, Ove Tobias
dc.contributor.advisorLopez-Pavon, Carlos
dc.contributor.authorSchnepf, Anja
dc.date.accessioned2024-09-02T11:07:49Z
dc.date.available2024-09-02T11:07:49Z
dc.date.issued2024
dc.identifier.citationDesign Optimisation of Power Cable Configurations for Floating Offshore Wind Turbines by Anja Schnepf, Stavanger : University of Stavanger, 2024 (PhD thesis UiS, no. 791)en_US
dc.identifier.isbn978-82-8439-277-6
dc.identifier.issn1890-1387
dc.identifier.urihttps://hdl.handle.net/11250/3149646
dc.descriptionPhD thesis in Offshore technologyen_US
dc.description.abstractThe present work investigates the design of dynamic inter-array power cable configurations for floating offshore wind turbines (FOWTs). It builds upon traditional design processes by integrating optimisation methods. Extensive reviews are provided on the current state of power cable configuration design, drawing parallels with umbilical and riser configurations in the oil and gas industry. Various power cable configurations are analysed under different environmental conditions. This research examines a newly proposed concept, the suspended power cable configuration. Environmental conditions strongly influence the feasibility of the configuration, with viable configurations identified for various locations. Different cable types show varied responses to the currents and motions induced by FOWTs. Among the investigated suspended configurations, those featuring multiple subsea buoys along their length are the most feasible. These configurations provide adequate buoyancy to maintain the power cable at midwater while having a reduced drag area, thus limiting cable excursions. An overview is provided on the objectives, variables, and constraints affecting the design of power cable configurations. Constraints are especially important to consider in every design because each location has unique conditions that must be carefully taken into account. Environmental loads represent the primary constraint for all power cable configurations, with currents and marine growth being the most significant factors. Typically, insufficient data are available to design power cable configurations with minimal risk of failure. Various constraints, including response constraints such as maximum allowable cable tensions and bending, as well as lifecycle constraints spanning installation, operation, maintenance, and decommissioning, must also be considered. This work proposes the integration of optimisation procedures into the design methodology. Specifically, the integration of the algorithms Sequential Least Squares Programming (SLSQP) and Efficient Global Optimization (EGO) into the design procedure is presented. Their application demonstrates significant improvements in cable configuration design.
dc.language.isoengen_US
dc.publisherUniversity of Stavanger, Norwayen_US
dc.relation.ispartofseriesPhD Theses UiS;
dc.relation.ispartofseries;791
dc.relation.haspartPaper A1: Schnepf, A., Devulder, A., Johnsen, Ø., Ong, M. C., & Lopez-Pavon, C. (2023). Numerical investigations on suspended power cable configurations for floating offshore wind turbines in deep water powering an FPSO. Journal of Offshore Mechanics and Arctic Engineering, 145(3), 030904. https://doi.org/10.1115/1.4057006. This paper is not available in the repository due to copyright restrictions.en_US
dc.relation.haspartPaper A2: Schnepf, A., Lopez-Pavon, C., Ong, M. C., Yin, G., & Johnsen, Ø. (2023). Feasibility study on suspended inter-array power cables between two spar-type offshore wind turbines. Ocean Engineering, 277, 114215. https://doi.org/10.101 6/j.oceaneng.2023.114215.en_US
dc.relation.haspartPaper A3: Schnepf, A. & Gudmestad, T.O. Key constraints for design analysis and optimisation of inter-array power cable configurations in floating offshore wind farms. Under review at Marine Structures.en_US
dc.relation.haspartPaper A4: Schnepf, A. & Giljarhus, K.E. Efficient Global Optimization of dynamic power cable configurations for floating offshore wind turbines. Under review at the Journal of Offshore Mechanics and Arctic Engineering.en_US
dc.relation.haspartPaper B1: Schnepf, A., Lopez-Pavon, C., Devulder, A., Johnsen, Ø., & Ong, M. C. (2022, June). Suspended power cable configurations for floating offshore wind turbines in deep water powering an FPSO. In International Conference on Offshore Mechanics and Arctic Engineering (Vol. 85932, p. V008T09A049). American Society of Mechanical Engineers. https: //doi.org/10.1115/OMAE2022-80071. This paper is not included in the repository due to copyright restrictions.en_US
dc.relation.haspartPaper B2: Beier, D., Schnepf, A., Van Steel, S., Ye, N., & Ong, M. C. (2023). Fatigue Analysis of Inter-Array Power Cables between Two Floating Offshore Wind Turbines Including a Simplified Method to Estimate Stress Factors. Journal of Marine Science and Engineering, 11(6), 1254. https://doi.org/ 10.3390/jmse11061254.en_US
dc.relation.haspartPaper B3: Gudmestad, O. T., & Schnepf, A. (2023). Design Basis Considerations for the Design of Floating Offshore Wind Turbines. Sustainable Marine Structures, 5(2), 26-34. https://doi.org/10.36956/sms.v5i2.913.en_US
dc.relation.haspartPaper B4: Shaukat, U., Schnepf, A., & Giljarhus, K. E. T. (2023, December). Flow over a step cylinder using partially-averaged Navier-Stokes equations with application towards dynamic subsea power cables. In IOP Conference Series: Materials Science and Engineering (Vol. 1294, No. 1, p. 012002). IOP Publishing. https: //doi.org/10.1088/1757-899X/1294/1/012002.en_US
dc.relation.haspartPaper B5: Sakaris, C. S., Schnepf, A., Schlanbusch, R., & Ong, M. C. (2022, November). A Comparative Study on Damage Detection in the Delta Mooring System of Spar Floating Offshore Wind Turbines. In European Workshop on Advanced Control and Diagnosis (pp. 283-293). Cham: Springer Nature Switzerland. https://doi.org/10.1007/978-3-031-27540-1_25.en_US
dc.relation.haspartPaper B6: Schnepf, A., Giljarhus, K. E. T., Johnsen, Ø., & Lopez-Pavon, C. (2023, June). Dynamic power cable configuration design for floating offshore wind turbines using gradient-based optimization. In International Conference on Offshore Mechanics and Arctic Engineering (Vol. 86908, p. V008T09A037). American Society of Mechanical Engineers. https: //doi.org/10.1115/OMAE2023-102788. This paper is not available in the repository due to copyright restrictions.en_US
dc.relation.haspartPaper B7: Ahmad, I. B., Schnepf, A., & Ong, M. C. (2023). An optimisation methodology for suspended inter-array power cable configurations between two floating offshore wind turbines. Ocean Engineering, 278, 114406. https://doi.org/10.1016/j.oceaneng.2023.114406.en_US
dc.rightsCopyright the author
dc.rightsNavngivelse-Ikkekommersiell 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/deed.no*
dc.subjectoffshore teknologien_US
dc.subjectvindturbineren_US
dc.subjectflytende vindturbineren_US
dc.subjectfloating offshore wind turbinesen_US
dc.titleDesign Optimisation of Power Cable Configurations for Floating Offshore Wind Turbinesen_US
dc.typeDoctoral thesisen_US
dc.rights.holder© 2024 Anja Schepfen_US
dc.subject.nsiVDP::Teknologi: 500::Marin teknologi: 580::Offshoreteknologi: 581en_US


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