All-electric wave energy converter connected in array with common DC-link for improved power quality

Sjolte, Jonas; Tjensvoll, Gaute; Molinas, Marta

doi:10.1109/pedg.2012.6254038

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…• 22 . A disparate result was obtained in 4 , where the conclusion was drawn that the fluctuations do not depend strongly on the directionality of the waves.…”

Section: Incoming Wave Directions Using Point-absorber Approximatimentioning

confidence: 99%

Methods of reducing power fluctuations in wave energy parks

Göteman

Engström

Eriksson

et al. 2014

Journal of Renewable and Sustainable Energy

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One of the major challenges in constructing effective and economically viable wave energy parks is to reduce the large fluctuations in power output. In this paper, we study different methods of reducing the fluctuations and improve the output power quality. The parameters studied include the number of devices, the separating distance between units, the global and local geometry of the array, sea state and incoming wave direction, and the impact of including buoys of different radii in an array. Our results show that, e.g., the fluctuations as well as power per device decrease strictly with the number of interacting units, when the separating distance is kept constant. However, including more devices in a park with fixed area will not necessarily result in lowered power fluctuations. We also show that varying the distance between units affects the power fluctuations to a much larger extent than it affects the magnitude of the absorbed power. The fluctuations are slightly lower in more realistic, randomized geometries where the buoys tend to drift slightly off their mean positions, and significantly lower in semi-circular geometries as opposed to rectangular geometries.

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“…• 22 . A disparate result was obtained in 4 , where the conclusion was drawn that the fluctuations do not depend strongly on the directionality of the waves.…”

Section: Incoming Wave Directions Using Point-absorber Approximatimentioning

confidence: 99%

Methods of reducing power fluctuations in wave energy parks

Göteman

Engström

Eriksson

et al. 2014

Journal of Renewable and Sustainable Energy

View full text Add to dashboard Cite

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“…Figure 7(a) shows the proposed layout that was put forward in our previous study described in [12,13]. The fundamentals behind this design is the need to space the WECs along the incoming wave direction to gain power quality from intermediate wave smoothing, while simultaneously achieving a good capture ratio, which requires spacing perpendicular to the incoming wave direction.…”

Section: Arraymentioning

confidence: 99%

Power Collection from Wave Energy Farms

2013

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Most Wave Energy Converters (WECs) produce highly distorted power due to the reciprocal motion induced by ocean waves. Some WEC systems have integrated energy storage that overcomes this limitation, but add significant expenses to an already costly system. As an alternative approach, this article investigates the direct export option that relies on aggregate smoothing among several WECs. By optimizing the positioning of the WEC devices with respect to the incoming waves, fluctuations may be mutually canceled out between the devices. This work is based on Fred. Olsen's WEC system Lifesaver, and a WEC farm consisting of 48 devices is designed in detail and simulated. The major cost driver for the electrical export system is the required oversize factor necessary for transfer of the average power output. Due to the low power quality, this number can be as high as 20 at the entry point of the electrical system, and it is thus crucial to quickly improve the power quality so that the downstream power system is efficiently utilized. The simulations undertaken in this work indicate that a high quality power output can be achieved at the farm level, but that a significant oversize factor will be required in the intermediate power system within the farm.

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“…In a centralized system, different wave conditions will cause unmatched pressures and energy interference in the pipeline of each WEC in different locations [48]. This problem is primarily attributed to the uncontrolled input end.…”

Section: Pressure Adjusting Technology Based On Dhcgmentioning

confidence: 99%