Investigation on the energy absorption performance of a fixed-bottom pressure-differential wave energy converter

Babarit, Aurélien; Wendt, Fabian; Yu, Yi-Hsiang; Weber, Jochem

doi:10.1016/j.apor.2017.03.017

Cited by 23 publications

(17 citation statements)

References 15 publications

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“…Another study [114] used numerical analysis to calculate the power absorption under real ocean wave conditions with the equations optimized using MATLAB. A new capturing concept was proposed, which used the pressure differences occurred at various points in the wave field to drive a fluid flow.…”

Section: Model Testing Of Wecsmentioning

confidence: 99%

Ocean Wave Energy Converters: Status and Challenges

2018

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Wave energy is substantial as a resource, and its potential to significantly contribute to the existing energy mix has been identified. However, the commercial utilization of wave energy is still very low. This paper reviewed the background of wave energy harvesting technology, its evolution, and the present status of the industry. By covering the theoretical formulations, wave resource characterization methods, hydrodynamics of wave interaction with the wave energy converter, and the power takeoff and electrical systems, different challenges were identified and discussed. Solutions were suggested while discussing the challenges in order to increase awareness and investment in wave energy industry as a whole.

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Section: Model Testing Of Wecsmentioning

confidence: 99%

Ocean Wave Energy Converters: Status and Challenges

2018

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“…From 1990 to 2011, prototype wave energy converters aimed at large-scale energy production were deployed worldwide with activities and interest on a steep upward trend [16][17][18][19][20]. From 2011 up to the present, the number of the prototype being implemented continues on a downward trend with fewer countries reporting developers who are actively advancing their technologies toward commercialisation or have achieved a significant amount of milestones along that path [21][22][23][24] (Fig.3.). Liliana et al reviewed the performance of various state-of-the-art wave energy converters and concluded the most existing WEC devices are still at the Research & Development (R&D) stage, and the well-known Pelamis system is currently encountering financial problems [23].…”

Section: Literature Reviewmentioning

confidence: 99%

“…And the corresponding damping ratios are =45. 24 As this PTO simulation platform is designed to work in real time in labs, therefore, gain-coefficient relationship curves are also drawn for generic use, in which the value in each fitted equations is P  used as the linear damping coefficient. And they are shown in Fig.10, the blue lines stand for the Dc and Gain relationship in a counterclockwise, and red lines in clockwise.…”

Section: Linear Pto Control Functions(n=1)mentioning

confidence: 99%

An innovative generic platform to simulate real-time PTO damping forces for ocean energy converters based on SIL method

2018

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This paper proposes a generic PTO (power-takeoff) simulation platform which can be used to predict how devices perform in wave conditions when a simulated real-time linear or non-linear PTO damping forces is employed. The experimental platform could be used to investigate the maximum power output of wave converters(WECs) without constructing a physical PTO system and complex control strategies at the design stage of a WEC, thus making it efficient and inexpensive to explore different PTO solutions. For this purpose, a software-in-the-loop (SIL) simulation method is adopted which uses an innovative control loop running on an inexpensive real-time controller coupled to a DC motor which simulates the PTO damping torque. To calibrate the proposed PTO simulation platform, 1349 drop tests are carried out. A series of relationship curves and corresponding equations are drawn for both the linear and non-linear PTO cases. Moreover, correlation curves for input gains and the produced damping force coefficients are provided. The correlation indicates the PTO simulation platform's capacity of simulating linear PTO can reach 40-220 and can reach 10-70 for quadratic damping in terms of damping force coefficient. To investigate the accuracy of the platform, uncertainty analyses are also carried out in good details. The calibrating tests and uncertainty analyses indicate that the proposed experimental platform can be used to overcome many of the limitations in modelling PTO systems at laboratory scale to simulate both real-time linear and quadratic PTO damping forces.

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“…To harvest energy from the ocean waves, wave energy converters (WECs) with various energy conversion mechanisms are developed. Babarit et al [1] proposed a fixed-bottom WEC which was driven by the pressure-differential. Ghasemi et al [2] developed a nonlinear model of a bottom-hinged flap device.…”

Section: Introductionmentioning

confidence: 99%

Multi-Stable Mechanism of an Oscillating-Body Wave Energy Converter

Zhang

Yuan

et al. 2020

IEEE Trans. Sustain. Energy

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The present research aims to utilize the multi-stable mechanism to increase the energy conversion of the oscillatingbody wave energy converter (WEC). Considering that a majority of WEC concepts are linear and single-stable, a nonlinear springdamper model is proposed to achieve the multi-stable mechanism. The system is either monostable or bistable depending on the initial condition of the springs. The energy conversion of a heaving point-absorber with the nonlinear spring-damper model is investigated in the present research. Firstly, a state-space dynamic model of the heaving point-absorber is developed. Then the energy conversion at both the monostable mode and the bistable mode is simulated. The present research also illustrates the response feature at the two stable modes. It is found the nonlinear pointabsorber behaves like a linear system in the monostable mode. The energy conversion is just increased slightly. Nevertheless, the energy absorption is increased substantially in the bistable mode. It is found that the velocity phase is adjusted in the bistable mode, leading to the enhancement of the energy conversion.

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Investigation on the energy absorption performance of a fixed-bottom pressure-differential wave energy converter

Cited by 23 publications

References 15 publications

Ocean Wave Energy Converters: Status and Challenges

Ocean Wave Energy Converters: Status and Challenges

An innovative generic platform to simulate real-time PTO damping forces for ocean energy converters based on SIL method

Multi-Stable Mechanism of an Oscillating-Body Wave Energy Converter

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