Ocean Wave Energy Conversion Concepts

Xiros, Nikolaos I.; Dhanak, Manhar R.

doi:10.1007/978-3-319-16649-0_45

Cited by 4 publications

(7 citation statements)

References 40 publications

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“…and the diffraction force in a linear manner. The F-K force can be approximated using the Froude-Krylov approach [24], which allows for estimation of the force.…”

Section: Wave Excitation Force On the Double Floating Body Systemmentioning

confidence: 99%

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Optimisation of Double Floating Bodies for Small Unmanned Marine Devices Based on a New Hydraulic Flexible WEMP System

Cong,

Ma,

Zhang

et al. 2024

Polish Maritime Research

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Low-power, small-size, unoccupied devices are often used in the ocean. However, the requirements for long-distance operation and long-term, high-power supplies have always been difficult technical problems to solve. Wave energy can be effectively used to meet the requirements of a high power supply. Based on a comprehensive analysis of the shortcomings of existing wave energy converters, we present an innovative design for a novel hydraulic flexible wave energy mobile power system and its internal structure. The dynamic model is then simplified into a double-float system, with a spring force from a flexible liquid bag on the upper and lower floating bodies. Furthermore, a model is developed to assess the energy efficiency of the double floating body, and the energy supply strategy and the posture of the double-float system are investigated. The hydrodynamic parameters of three typical axisymmetric rotary floating bodies are analysed using AQWA software, and it is found that the hemispheric-bottomed cylinder (HBC) exhibits superior energy efficiency under the same conditions of space, mass, and drainage volume. Its energy efficiency is mainly reflected in its ability to capture the wave frequency and wave width. HBC floaters perform optimally in both respects. The stability of our design is analysed, and a mathematical relationship between the centroid G and the centre O of the HBC model is developed. The stability of the model is then studied. This study provides a theoretical basis for the provision of low-power, compact, unmanned maritime equipment.

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“…and the diffraction force in a linear manner. The F-K force can be approximated using the Froude-Krylov approach [24], which allows for estimation of the force.…”

Section: Wave Excitation Force On the Double Floating Body Systemmentioning

confidence: 99%

“…Under small oscillations, the average exciting power over one wave period for a symmetrical floating body, P ˆE [24], is…”

Section: Energy Efficiency Evaluation Model Of the Double Floating Bo...mentioning

confidence: 99%

Optimisation of Double Floating Bodies for Small Unmanned Marine Devices Based on a New Hydraulic Flexible WEMP System

Cong,

Ma,

Zhang

et al. 2024

Polish Maritime Research

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“…(2) point absorbers, attenuators, and terminators [8,9]; (3) other technologies [10]. Seabased industry [11] is one of the partners of the DUAL Ports project.…”

Section: Introductionmentioning

confidence: 99%

Renewable Energy Potential for Micro-Grid at Hvide Sande

Potapenko

Döhler

Francisco³

et al. 2023

Sustainability

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Decarbonization of ports is a major goal to reduce their global carbon footprint. The port of Hvide Sande is located on the coast of the North Sea in Denmark and it has the potential to utilize various renewable energy sources. Wind and solar thermal parks are already installed there. Wave energy is an alternative to solar and wind energies and its advantage is the spatial concentration, predictability, and persistence. Heat to the town is provided by Hvide Sande Fjernvarme. In this work, it is investigated if the heat demand could be fully covered by renewable energies. Power profiles for each renewable energy resource were calculated using 30 years of re-analysis environmental data. Long, mid, and short term time series of power supply has been statistically and quantitatively examined. Considering the heat demand of Hvide Sande, the lowest frequency of zero occurrence in power generation can be ensured by the combination of wind, solar energy and wave. The article also estimated the capacity for Lithium-ion batteries. The optimal size of the battery is found by the bisection method. Finally, different combinations of renewable energy and demand as well as batteries are evaluated. The lowest zero occurrences in power production is met by the mix of three renewable energies. Also, the mix of three renewable energies significantly reduces the value of energy, required from the battery.

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“…A large number of wave energy converters (WECs) have been designed to absorb wave energy. However, very few of them have been deployed offshore, and there is currently no leading technology [2,3]. An economically feasible technology still has to be found because of a combination of large forces, low speeds, and a harsh offshore environment.…”

Section: Introductionmentioning

confidence: 99%

“…The conventional classifications of WECs are as follows: (1) attenuators, terminators, and point absorbers [4,5]; (2) oscillating water columns (OWC), overtopping devices, and oscillating bodies [6,7]. Other technologies outside of these classifications have been proposed [2]. For example, submerged pressure differential devices [3].…”

Section: Introductionmentioning

confidence: 99%

Wave Energy Converter’s Slack and Stiff Connection: Study of Absorbed Power in Irregular Waves

et al. 2021

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Two different concepts of wave energy converter coupled to the novel C-GEN linear generator have been studied numerically, including the evaluation of different buoy sizes. The first concept has a slack connection between the buoy and the generator on the seabed. Another concept is based on a stiff connection between the buoy and the generator placed on an offshore platform. Three different approaches to calculate the damping force have been utilized within this study: the optimal damping coefficient, R-load, and RC-load. R-load is a model for the load applied to a grid-connected generator with passive rectification. RC-load is a model for a phase angle compensation applied to a system with active rectification. The radiation forces originating from the oscillatory motion of the buoy have been approximated using the transfer function in the frequency domain and the vector fitting algorithm. A comparison of the approximation methods is presented, and their accuracy has been evaluated. The advantage of the vector fitting method has been shown, especially for higher approximation orders which fit the transfer function with high accuracy. The study’s final results are shown in terms of the absorbed power for the sea states of March 2018 at Wave Hub, UK.

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Ocean Wave Energy Conversion Concepts

Cited by 4 publications

References 40 publications

Optimisation of Double Floating Bodies for Small Unmanned Marine Devices Based on a New Hydraulic Flexible WEMP System

Optimisation of Double Floating Bodies for Small Unmanned Marine Devices Based on a New Hydraulic Flexible WEMP System

Renewable Energy Potential for Micro-Grid at Hvide Sande

Wave Energy Converter’s Slack and Stiff Connection: Study of Absorbed Power in Irregular Waves

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