Wave energy conversion by cylinder array with a floating platform considering linear/nonlinear PTO damping

Liu, H. X.; Zhang, W. C.; Zheng, Xing; Zhang, L.; Zhang, X. W.; Cui, Limei

doi:10.1007/s00773-017-0441-2

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…Optimum PTO Damping nearly doubles the displacement of the two bodies, increasing interaction. This is verified in the literature [23,35,51]. 3.…”

Section: Discussionsupporting

confidence: 83%

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Modeling Link for Ocean Wave Energy of Point Absorbers: A Mathematical Framework

Hernandez¹

2017

Preprint

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This compendium presents new mathematical techniques for modeling Point Absorbers. A combined frequency-time domain framework is developed. It is used to simulate the energy generated by the wave farms. With Matlab and Fortran as a base, this leads to obtain physical variables of primary importance, namely position, velocity and power to energy net balance relationships of absorption. Integration of different degrees of freedom with heave as main executable leads in turn to a single buoy motion focus. Acquisition of the needed hydrodynamic coefficients is provided through application of potential field solvers with Boundary Element Methodology background. Initially, this Wave-to-motion model is validated by comparison with previous experimental results for a floating cone cylinder shape (Buldra-FO3). A single, generic, vertical floating cylinder is contemplated then, that responds to the action of the passing regular waves excitation. Later, two equally sized vertical floating cylinders aligned with the incident wave direction are modeled for a variable distance between the bodies. For both unidirectional regular and irregular waves as an input in deep water, we approximate the convolutive radiation force function term through the Prony method. By changing the spatial disposition of the axisymmetric buoys, using for instance triangular or rectangular shaped arrays of three and four bodies respectively, the study delves into motion characteristics for regular waves. The results highlight efficient layouts for maximizing the energy production whilst providing important insights into their performance, revealing displacement amplification-and capture width-ratios, while deriving in possible interpretations of scenarios related to the known park effect. These terms are encompassed by the novelty of a new conceptual Post-Processing methodology in the field, which leads to obtain an optimal distance for the separated bodies with effective energy absorption in a regular wave regime. The main objective is to generate a tendency within the hydrodynamic field of study, which is the Wave to motion perspective. More generally, this computational excursion envisions and depicts potential fields of study, which will surely enhance new connections and link this renewable energy form. Therefore, this research delves first into the historical and technical background on Ocean Wave Energy. Next, it is in the section regarding Materials and Methods, where boundaries and related equations are introduced step by step, together with latter mentioned case scenarios, and their corresponding configuration parameters. A separate section frames then the scope of results, while finally, there is an ensuing discussion and conclusions for evaluation assessment.

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“…Optimum PTO Damping nearly doubles the displacement of the two bodies, increasing interaction. This is verified in the literature [23,35,51]. 3.…”

Section: Discussionsupporting

confidence: 83%

“…The triangle configuration itself turns out to be the a suitable choice in terms of Wave Energy extraction for small arrays according to literature [41,51]. Out of this recent references it is also worth to investigate results for greater arrays.…”

Section: Discussionmentioning

confidence: 99%

Modeling Link for Ocean Wave Energy of Point Absorbers: A Mathematical Framework

Hernandez¹

2017

Preprint

View full text Add to dashboard Cite

show abstract

“…Optimum PTO Damping nearly doubles the displacement of the two bodies, increasing interaction. This is verified in the literature [22,34,50]. 3.…”

Section: Discussionsupporting

confidence: 83%

“…The triangle configuration itself turns out to be the a suitable choice in terms of Wave Energy extraction for small arrays according to literature [40,50]. Out of this recent references it is also worth to investigate results for greater arrays.…”

Section: Discussionmentioning

confidence: 99%

Computational Investigation on Various Small Array Dispositions of Generic Points Absorbers

Hernandez¹

2017

Preprint

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This thesis completion works it out to deepen into diverse modeling techniques for Point Absorbers. A combined frequency-time domain model is conceived, designed and developed in Matlab with FoRtran as a base., leading to obtain physical variables of primary importance, namely position, velocity and power to Energy net balance relationships of absorption. Integration of different degrees of freedom with heave as main executable leads in turn to a single buoy motion focus. Acquisition of the needed hydrodynamic coefficients is provided though application of NEMOH & BEMIO solvers due to the Boundary Element Methodology. Initially, this Wave-to-motion model is validated through comparison with previous experimental results for a floating cone cylinder shape (Buldra-FO3). A single, generic, vertical floating cylinder is contemplated then, that responds to the action of the passing regular waves excitation. Later, two equally sized vertical floating cylinders aligned with the incident wave direction are modeled for a variable distance between the bodies. For both unidirectional regular and irregular waves as an input in deep water, we approximate the convolutive radiation force function term through the Prony method. By changing the spatial disposition of the axisymmetric buoys, using for instance triangular or rectangular shaped arrays of three and four bodies respectively, the study delves into motion characteristics for regular waves. The results highlight efficient layouts for maximizing the energy production whilst providing important insights into their performance, revealing displacement amplification-and capture width-ratios, while deriving in possible interpretations of scenarios related to the the known park effect. These terms are encompassed by the novelty of a new conceptual Post-Processing methodology in the field, which leads to obtain an optimal distance for the separated bodies with effective energy absorption in a regular wave regime. In conclusion, this computational excursion envisions and proposes potentials fields of study, which will surely enhance new connections and link this renewable energy form.

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“…In recent years, much research focused on floating point‐absorbing WECs based on modeling. Liu et al 12 employed an array of floating point‐absorbing WECs for extracting ocean wave energy efficiently. The WECs in regular waves were proposed when considering the power‐take‐off (PTO) damping type, array layout, separating distance, and incident wave direction.…”

Section: Introductionmentioning

confidence: 99%

Oscillating body wave energy conversion efficiency based on Simulink simulation training

Yin,

Lu,

et al. 2024

Energy Science & Engineering

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With the development of the economy and society, we are faced with the dual challenges of energy demands and environmental pollution. As one of the important marine renewable energies, wave energy is widely distributed and abundant, and has considerable applications in various fields. Oscillating body wave energy converter (WEC) is most popular among WECs; its energy conversion efficiency is thus one of the key issues for practical large‐scale applications. This article establishes a new model of the float and vibrator under different motion conditions, conducts simulation training, and then solves the displacement and velocity at different times, and finally optimizes the maximum output power and optimal damping coefficient. Simulink calculation is one of the most effective tools including neural networks, which allows us to achieve intelligent training and simulation. The obtained data imply that the maximum output power could be 8.102 W when the corresponding linear damping is 21,000 N s/m and the rotation damping is 95,000 N s/m. The article takes into account the pitching motion of the float, providing a more realistic model and obtaining optimal power absorbing efficiency. The obtained results could be the potential reference data in practically setting up the wave energy conversion systems.

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Wave energy conversion by cylinder array with a floating platform considering linear/nonlinear PTO damping

Cited by 9 publications

References 18 publications

Modeling Link for Ocean Wave Energy of Point Absorbers: A Mathematical Framework

Modeling Link for Ocean Wave Energy of Point Absorbers: A Mathematical Framework

Computational Investigation on Various Small Array Dispositions of Generic Points Absorbers

Oscillating body wave energy conversion efficiency based on Simulink simulation training

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