The effects of sea-state on optimal generator parameters for a wave energy converter

Shokoufa Zeinali; Magnus Wiktorsson; Johan Lindström; Georg Lindgren; Jan Forsberg; X. Shao; J. W. Ringsberg

doi:10.1201/9781003558859-61

The effects of sea-state on optimal generator parameters for a wave energy converter

Shokoufa Zeinali, Magnus Wiktorsson, Johan Lindström, Georg Lindgren, Jan Forsberg, X. Shao, J. W. Ringsberg

Research output: Chapter in Book/Report/Conference proceeding › Paper in conference proceeding › peer-review

Abstract

The power take-off (PTO) system and control laws for wave energy converters (WECs) are crucial for system performance. Determining optimal PTO parameters based on different sea states is key for formulating control laws, identifying optimal WEC locations, and optimizing wave-to-wire performance. This study focuses on an oscillating water column (OWC) type WEC developed by Waves4Power using a buoy and piston in a water tube to generate hydraulic pressure in an accumulator tank for an electric generator. For 78 different sea states, optimal generator parameters maximizing electrical output are identified using waves simulated from Pierson-Moskowitz (PM) spectra and a Simulink model, including non-linear PTO effects. Results show a strong dependency between optimal generator speed and sea state, suggesting control laws based on sea state can enhance energy production. Wave steepness is the most important characteristic, hence four representative sea states based on their steepness are used to illustrate results.

Original language	English
Title of host publication	Innovations in Renewable Energies Offshore
Subtitle of host publication	Proceedings of the 6th International Conference on Renewable Energies Offshore, RENEW 2024
Editors	Carlos Guedes Soares, Shan Wang
Publisher	CRC Press/Balkema
Pages	551-558
Number of pages	8
ISBN (Electronic)	9781003558859
ISBN (Print)	9781032905570
DOIs	https://doi.org/10.1201/9781003558859-61
Publication status	Published - 2025
Event	6th International Conference on Renewable Energies Offshore, RENEW 2024 - Lisbon, Portugal Duration: 2024 Nov 19 → 2024 Nov 21

Conference

Conference	6th International Conference on Renewable Energies Offshore, RENEW 2024
Country/Territory	Portugal
City	Lisbon
Period	2024/11/19 → 2024/11/21

Subject classification (UKÄ)

Marine Engineering (including Ocean and River Engineering)

Access to Document

10.1201/9781003558859-61

Statistical modelling of wave powerplants
Zeinali, S. (Researcher), Wiktorsson, M. (Assistant supervisor) & Lindström, J. (Supervisor)
2022/01/10 → 2024/09/01
Project: Research

Cite this

Zeinali, S., Wiktorsson, M., Lindström, J., Lindgren, G., Forsberg, J., Shao, X., & Ringsberg, J. W. (2025). The effects of sea-state on optimal generator parameters for a wave energy converter. In C. Guedes Soares, & S. Wang (Eds.), Innovations in Renewable Energies Offshore: Proceedings of the 6th International Conference on Renewable Energies Offshore, RENEW 2024 (pp. 551-558). CRC Press/Balkema. https://doi.org/10.1201/9781003558859-61

Zeinali, Shokoufa ; Wiktorsson, Magnus ; Lindström, Johan et al. / The effects of sea-state on optimal generator parameters for a wave energy converter. Innovations in Renewable Energies Offshore: Proceedings of the 6th International Conference on Renewable Energies Offshore, RENEW 2024. editor / Carlos Guedes Soares ; Shan Wang. CRC Press/Balkema, 2025. pp. 551-558

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title = "The effects of sea-state on optimal generator parameters for a wave energy converter",

abstract = "The power take-off (PTO) system and control laws for wave energy converters (WECs) are crucial for system performance. Determining optimal PTO parameters based on different sea states is key for formulating control laws, identifying optimal WEC locations, and optimizing wave-to-wire performance. This study focuses on an oscillating water column (OWC) type WEC developed by Waves4Power using a buoy and piston in a water tube to generate hydraulic pressure in an accumulator tank for an electric generator. For 78 different sea states, optimal generator parameters maximizing electrical output are identified using waves simulated from Pierson-Moskowitz (PM) spectra and a Simulink model, including non-linear PTO effects. Results show a strong dependency between optimal generator speed and sea state, suggesting control laws based on sea state can enhance energy production. Wave steepness is the most important characteristic, hence four representative sea states based on their steepness are used to illustrate results.",

author = "Shokoufa Zeinali and Magnus Wiktorsson and Johan Lindstr{\"o}m and Georg Lindgren and Jan Forsberg and X. Shao and Ringsberg, {J. W.}",

year = "2025",

doi = "10.1201/9781003558859-61",

language = "English",

isbn = "9781032905570",

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editor = "{Guedes Soares}, Carlos and Shan Wang",

booktitle = "Innovations in Renewable Energies Offshore",

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note = "6th International Conference on Renewable Energies Offshore, RENEW 2024 ; Conference date: 19-11-2024 Through 21-11-2024",

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Zeinali, S , Wiktorsson, M , Lindström, J , Lindgren, G, Forsberg, J, Shao, X & Ringsberg, JW 2025, The effects of sea-state on optimal generator parameters for a wave energy converter. in C Guedes Soares & S Wang (eds), Innovations in Renewable Energies Offshore: Proceedings of the 6th International Conference on Renewable Energies Offshore, RENEW 2024. CRC Press/Balkema, pp. 551-558, 6th International Conference on Renewable Energies Offshore, RENEW 2024, Lisbon, Portugal, 2024/11/19. https://doi.org/10.1201/9781003558859-61

The effects of sea-state on optimal generator parameters for a wave energy converter. / Zeinali, Shokoufa ; Wiktorsson, Magnus ; Lindström, Johan et al.
Innovations in Renewable Energies Offshore: Proceedings of the 6th International Conference on Renewable Energies Offshore, RENEW 2024. ed. / Carlos Guedes Soares; Shan Wang. CRC Press/Balkema, 2025. p. 551-558.

Research output: Chapter in Book/Report/Conference proceeding › Paper in conference proceeding › peer-review

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AU - Zeinali, Shokoufa

AU - Wiktorsson, Magnus

AU - Lindström, Johan

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AU - Forsberg, Jan

AU - Shao, X.

AU - Ringsberg, J. W.

PY - 2025

Y1 - 2025

N2 - The power take-off (PTO) system and control laws for wave energy converters (WECs) are crucial for system performance. Determining optimal PTO parameters based on different sea states is key for formulating control laws, identifying optimal WEC locations, and optimizing wave-to-wire performance. This study focuses on an oscillating water column (OWC) type WEC developed by Waves4Power using a buoy and piston in a water tube to generate hydraulic pressure in an accumulator tank for an electric generator. For 78 different sea states, optimal generator parameters maximizing electrical output are identified using waves simulated from Pierson-Moskowitz (PM) spectra and a Simulink model, including non-linear PTO effects. Results show a strong dependency between optimal generator speed and sea state, suggesting control laws based on sea state can enhance energy production. Wave steepness is the most important characteristic, hence four representative sea states based on their steepness are used to illustrate results.

AB - The power take-off (PTO) system and control laws for wave energy converters (WECs) are crucial for system performance. Determining optimal PTO parameters based on different sea states is key for formulating control laws, identifying optimal WEC locations, and optimizing wave-to-wire performance. This study focuses on an oscillating water column (OWC) type WEC developed by Waves4Power using a buoy and piston in a water tube to generate hydraulic pressure in an accumulator tank for an electric generator. For 78 different sea states, optimal generator parameters maximizing electrical output are identified using waves simulated from Pierson-Moskowitz (PM) spectra and a Simulink model, including non-linear PTO effects. Results show a strong dependency between optimal generator speed and sea state, suggesting control laws based on sea state can enhance energy production. Wave steepness is the most important characteristic, hence four representative sea states based on their steepness are used to illustrate results.

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BT - Innovations in Renewable Energies Offshore

A2 - Guedes Soares, Carlos

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ER -

Zeinali S , Wiktorsson M , Lindström J , Lindgren G, Forsberg J, Shao X et al. The effects of sea-state on optimal generator parameters for a wave energy converter. In Guedes Soares C, Wang S, editors, Innovations in Renewable Energies Offshore: Proceedings of the 6th International Conference on Renewable Energies Offshore, RENEW 2024. CRC Press/Balkema. 2025. p. 551-558 doi: 10.1201/9781003558859-61

The effects of sea-state on optimal generator parameters for a wave energy converter

Abstract

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Projects

Statistical modelling of wave powerplants

Cite this