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An FMI-based co-simulation framework for simulations of wave energy converter systems
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics. Chalmers University of Technology, Sweden.ORCID iD: 0000-0001-7182-0872
Chalmers University of Technology, Sweden.
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2025 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 323, article id 119220Article in journal (Refereed) Published
Abstract [en]

A wave energy converter (WEC) comprises many components with distinct functions. The whole WEC system is complicated, as each component is also a complex subsystem. It is challenging to properly model and couple these subsystems to achieve a global simulation of the whole system. This study proposes an FMI-based co-simulation framework to tackle this challenge. Through the use of a co-simulation technique requiring minimal programming effort, a suite of numerical solvers serving for modelling various WEC components is coupled to create a comprehensive system model for a single WEC unit. The modules of the Ansys software, Aqwa and Rigid Dynamics, are employed to model hydrodynamic loads and motion responses. Simulink is utilized to model the power take-off (PTO) system and then integrate all models into a global simulation. The capability and accuracy of the FMI-based co-simulation framework are validated against an experimental heave decay test and verified by cross-comparing a numerical model built in SESAM. Furthermore, the framework is expanded to encompass the modelling of a large-scale wave park that includes multiple WEC units. Based on a novel WEC concept called NoviOcean, two study cases of a single unit and an 18-unit wave park are investigated. Buoy motions and power performance under several regular and irregular sea states are analysed. The hydrodynamic interactions between the units are evaluated quantitatively regarding the power performance. It is found that the interactions improve the power performance, with a maximum increase of up to 36%. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2025. Vol. 323, article id 119220
Keywords [en]
Digital elevation model; Frequency converters; Converter system; Cosimulation; FMI-based co-simulation; Global simulation; Global system models; Interaction effect; Power performance; Simulation framework; Wave energy converters; Wave park; Wave energy conversion
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:ri:diva-76181DOI: 10.1016/j.enconman.2024.119220Scopus ID: 2-s2.0-85208760221OAI: oai:DiVA.org:ri-76181DiVA, id: diva2:1915171
Note

This work was performed within the projects ‘Control of wave energy converters based on wave measurements, for optimal energy absorption’, funded by the Swedish Energy Agency through contract agreement no. 50197-1, and ‘INTERACT Analysis of array systems of wave energy converters with regard to interaction effects in the LCoE and fatigue analyses’, funded by the Swedish Energy Agency through contract agreement no. 50148-1. This work also received funding from the Chalmers University of Technology Foundation for the strategi cresearch project ‘Hydro- and aerodynamics’

Available from: 2024-11-21 Created: 2024-11-21 Last updated: 2024-11-21Bibliographically approved

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Johnson, Erland

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