Performance analysis of solo Duck wave energy converter arrays under motion constraints

Wu, Jinming; Yao, Yingxue; Zhou, Liang; Chen, Ni; Huifeng, YU; Li, Wei; Göteman, Malin

doi:10.1016/j.energy.2017.07.152

Cited by 27 publications

(17 citation statements)

References 19 publications

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“…Optimization in terms of maximizing the energy absorption under WEC motion constraints was considered by and for three arrays of 2-3 WECs. Similarly, an iterative quasi-Newton optimization algorithm was applied by Wu et al (2017) to identify the maximum captured power of an array of Duck WECs under motion constraints. Optimization of the absorbed power for point-absorbers operating in heave in a fixed array layout but with individually chosen constant damping of the WECs was considered by Wang et al (2016a,b).…”

Section: Non-linear Programming Optimizationmentioning

confidence: 99%

Advances and Challenges in Wave Energy Park Optimization—A Review

et al. 2020

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A commercial wave energy system will typically consist of many interacting wave energy converters installed in a park. The performance of the park depends on many parameters such as array layout and number of devices, and may be evaluated based on different measures such as energy absorption, electricity quality, or cost of the produced electricity. As wave energy is currently at the stage where several large-scale installations are being planned, optimizing the park performance is an active research area, with many important contributions in the past few years. Here, this research is reviewed, with a focus on identifying the current state of the art, analyzing how realistic, reliable, and relevant the methods and the results are, and outlining directions for future research.

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Section: Non-linear Programming Optimizationmentioning

confidence: 99%

Advances and Challenges in Wave Energy Park Optimization—A Review

et al. 2020

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“…The hydrodynamic coefficients are calculated using the ANSYS AQWA (ANSYS, Inc., Canonsburg, PA, USA) [31] software and they are validated in [9,10] by comparison with experimental results measured in [5]. Due to the angular velocity be involved in the convolution term, solving Equation (1) by directly integrating the convolution is time-consuming.…”

Section: T E P T O I a θ T Kt τ θ τ τ Cθ T M T M T (1)mentioning

confidence: 99%

“…Also, the pitch axis of the solo duck can be treated as fixed provided that the pre-tension margin and stiffness of the tension legs of the WEC taut-mooring system, which is shown in [9], are sufficiently large. …”

Section: Introductionmentioning

confidence: 99%

“…The Edinburgh duck WEC was proposed at this time [3] and is renowned for its high efficiency, which is confirmed to exceed 90% in 2D regular wave tests [4]. In addition to the WEC farm topology whereby duck members are closely spaced and working as terminators, the topology whereby duck members are spaced at a distance and working as point absorbers has also received wide attention [5][6][7][8][9][10]. In the latter case, each duck member is called a 'solo duck'.…”

Section: Introductionmentioning

confidence: 99%

“…An innovative solo duck with a circular cross section but off-centered pitch axis was proposed by Lucas et al [7] and Cruz et al [8] to simplify the manufacturing process. The separation distance and layout of the solo duck WECs in an array was optimized by Wu et al [9].…”

Section: Introductionmentioning

confidence: 99%

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Latching and Declutching Control of the Solo Duck Wave-Energy Converter with Different Load Types

Yao

Zhou

et al. 2017

Energies

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Abstract:The solo duck wave-energy converter (WEC) captures power in a point absorber manner, hence it exhibits high power-capture efficiency within only a narrow bandwidth. Passive control is characterized by a unidirectional power flow, and thus its engineering implementation can be simplified. In this paper, two typical passive control strategies, latching and declutching control, are applied to the solo duck WEC to improve its power-capture performance at wave periods larger and smaller than the natural period of the WEC, respectively. Special attention is paid to the peak value of instantaneous WEC performance parameters, including the peak motion excursion, the peak power take-off (PTO) moment, and the peak-to-average power ratio, when the captured power is maximized. Performance differences between the linear and coulomb loads are also investigated. Results show that both latching and declutching control can effectively improve captured power, but also incidentally increase the peak motion excursion and peak-to-average power ratio. When under latching and declutching control, the coulomb load leads to the same maximum relative capture width and peak motion excursion as the linear load, but presents smaller peak PTO moment and peak-to-average power ratio than the linear load, hence making the coulomb load the better choice for the solo duck WEC.

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