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IWEC – Model Validation and CostOptimization of Infinity WEC Wave EnergyConverter
Ocean Harvesting Technologies AB, Sweden.
Ocean Harvesting Technologies AB, Sweden.
RISE Research Institutes of Sweden, Safety and Transport, Safety Research.ORCID iD: 0000-0001-6934-634x
Ocean Harvesting Technologies AB, Sweden.
2021 (English)In: Proceedings of the 14th European Wave and Tidal Energy Conference 5-9th Sept 2021, Plymouth, UK, 2021, p. 2192-1-2192-10Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents the methods developed and key findings of the IWEC project performed by Ocean Harvesting Technologies AB (OHT). It aimed to reduce the levelized cost of energy (LCoE) of OHT’s wave energy converter InfinityWEC, by analysing how different key parameters impact cost and annual output using a model of a 100-MW array installation. Component-level cost functions were developed and mapped to key parameters and constraints of the system. A large number of system configurations were then evaluated with a numerically efficient 3 degree-of-freedom (DoF) nonlinear radiationdiffraction model in WEC-Sim along with OHT’s sea statetuned polynomial reactive control (PRC). The most promising configurations were identified and investigated in more detail. The configuration with the best LCoE were finally identified and analysed further, including estimation of the effect of changing the PRC to model predictive control, which resulted in 17-34% higher annual output and 12-23% lower LCoE. The final LCoE was found to be 93 – 162 EUR / MWh at 100 MW installed capacity. An important finding from the study is that using simplified metrics such as CAPEX/ton was found to be irrelevant. Numerical wave tank testing, high-fidelity computational fluid dynamics (CFD), were used to tune the viscous drag of the 3 DoF WEC-Sim model. Applying verification and validation (V&V) techniques the CFD simulations showed a relatively large numerical uncertainty, but the average power and the motion responses were found to be sufficiently accurate.

Place, publisher, year, edition, pages
2021. p. 2192-1-2192-10
Keywords [en]
Wave power, LCoE, Techno-economic optimization, numerical wave tank testing, CFD, model validation
National Category
Marine Engineering
Identifiers
URN: urn:nbn:se:ri:diva-56727OAI: oai:DiVA.org:ri-56727DiVA, id: diva2:1598888
Conference
14th European Wave and Tidal Energy Conference 5-9th Sept 2021, Plymouth, UK
Note

This work was supported in part by the Swedish Energy Agency under grant 47398-1.

Available from: 2021-09-29 Created: 2021-09-29 Last updated: 2023-05-16Bibliographically approved

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Eskilsson, Claes

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