The intra-annual variability in the performance of wave energy converters: A comparative study in N Galicia (Spain)

Carballo, R.; Sánchez, M.; Ramos, V.; Fraguela, J.A.; Iglesias, G.

doi:10.1016/j.energy.2015.01.020

Cited by 63 publications

(26 citation statements)

References 34 publications

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“…These averaged estimations of WECs performances depend, however, strongly on the adaptation of devices to the wave conditions at a given location. In offshore waters of northern Galicia (Spain), Carballo et al [25] exhibited thus stronger performances of Pelamis and AquaBuOY. Their 19-year (1996Their 19-year ( -2014 numerical evaluation of wave conditions reported averaged capacity factors of 27.0% for Pelamis and 26.3% for AquaBuOY.…”

Section: Potential Locationsmentioning

confidence: 99%

“…Apart from a few exceptions [10,19,25,27], most of these studies compared the averaged technical resource generated by a series of WECs in potential farm locations while ignoring the inter-and intra-annual variabilities of energy production. These aspects are, however, fundamental to consider as a device may show yearly-averaged high efficiency whereas the technology is designed for winter conditions, only.…”

Section: Introductionmentioning

confidence: 99%

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Annual and seasonal variabilities in the performances of wave energy converters

Guillou

Chapalain

2018

Energy

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Locations of wave energy converters (WECs) are, most of the time, determined in areas with the highest density of mean wave power while ignoring the temporal variabilities of the resource. The most energetic regions are, however, characterised by strong interand intra-annual variations of wave power that may impact the energy production and performances of devices. We investigated these influences by focusing on the generated power from three well-known WECs that reached the stage of full-stage testing: Pelamis, AquaBuOY and Wave Dragon. This evaluation was conducted in western Brittany, one of the most energetic area along the coast of France. In comparison with the available resource, the generated technical power was characterised by reduced annual and seasonal variations. These effects were particularly noticeable for Pelamis that exhibited a reduced intermittency in the energy output between the winter and summer periods. The most energetic conditions had furthermore a restricted contribution to devices power output, mainly related to events with energy periods between 10.5 and 12.5 s, and significant wave heights between 2.75 and 4.25 m. WECs performances exhibited finally strong variabilities, in winter, with monthly-averaged values of the capacity factor up to 65% for Wave Dragon.

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Section: Potential Locationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Annual and seasonal variabilities in the performances of wave energy converters

Guillou

Chapalain

2018

Energy

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“…Estimates show that ocean wave energy can realistically provide about 10% of world's electricity need [1][2][3][4][5]. This potential, along with proximity to load centers that are typically along coastal areas, as well as good predictability and power consistency makes wave energy an appealing solution to avoid archaic pollutant-rich energy production methods [6,7]. Harnessing ocean wave energy, however, faces several major challenges that have, so far, barred wave energy industry from taking off.…”

Section: Introductionmentioning

confidence: 99%

Shape optimization of wave energy converters for broadband directional incident waves

Esmaeilzadeh

Alam

2019

Ocean Engineering

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Here, through a systematic methodology and the use of high performance computing, we calculate the optimum shape for a wave energy converter under the action of incident waves of (i) monochromatic unidirectional, (ii) monochromatic directional, (iii) polychromatic unidirectional and (iv) polychromatic directional (with both directional symmetry and asymmetry). As a benchmark for our study, without loss of generality, we consider a submerged planar pressure differential wave energy converter, and use Genetic Algorithm to search through a wide range of shapes. A new parametric description of absorber shape based on Fourier decomposition of geometrical shapes is introduced, and for each shape hydrodynamic coefficients are calculated, optimum power take-off parameters are obtained, and overall efficiency is determined. We show that an optimum geometry of the absorber plate can absorb a significantly higher energy (in some cases few times higher) when compared to a circular shape of the same area. Specifically, for a unidirectional incident wave, the optimum shape, as expected, is obtained to be the most elongated shape. For directional incident waves, a butterfly-shape is the optimum geometry whose details depend on not only the amplitude and direction of incident wave components, but also the relative phases of those components. For the latter effect, we find an optimally averaged profile through a statistical analysis.

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“…The key steps in the optimization process are the geometry tuning procedure and the Power Take Off control [27][28][29][30][31][32][33]. However, after that, a production efficiency-based design is proposed; a second stage of design for Reliability, Availability, and Maintainability (RAM) is required [34].…”

Section: Introductionmentioning

confidence: 99%

Economic Assessment of Overtopping BReakwater for Energy Conversion (OBREC): A Case Study in Western Australia

et al. 2016

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This paper constructs an optimal configuration assessment, in terms of the financial returns, of the Overtopping BReakwater for wave Energy Conversion (OBREC). This technology represents a hybrid wave energy harvester, totally embedded in traditional rubble mound breakwaters. Nine case studies along the southern coast of Western Australia have been analysed. The technique provides tips on how to estimate the quality of the investments, for benchmarking with different turbine strategy layouts and overlapping with the costs of traditional rubble mound breakwaters. Analyses of the offshore and nearshore wave climate have been studied by a high resolution coastal propagation model, forced with wave data from the European Centre for Medium-Range Weather Forecasts (ECMWF). Inshore wave conditions have been used to quantify the exploitable resources. It has been demonstrated that the optimal investment strategy is nonlinearly dependent on potential electricity production due to outer technical constraints. The work emphasizes the importance of integrating energy production predictions in an economic decision framework for prioritizing adaptation investments.

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The intra-annual variability in the performance of wave energy converters: A comparative study in N Galicia (Spain)

Cited by 63 publications

References 34 publications

Annual and seasonal variabilities in the performances of wave energy converters

Annual and seasonal variabilities in the performances of wave energy converters

Shape optimization of wave energy converters for broadband directional incident waves

Economic Assessment of Overtopping BReakwater for Energy Conversion (OBREC): A Case Study in Western Australia

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