Performance of OWC wave energy converters: influence of turbine damping and tidal variability

López, I.; Pereiras, Bruno; Ruíz, Francisco; Iglesias, G.

doi:10.1002/er.3239

Cited by 106 publications

(44 citation statements)

References 45 publications

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“…The five parameters defined to characterise the hydrodynamic response of the hybrid device (K R , K T , C WR , RAO C and RAO P ) depend not only on the wave conditions (wave height and period) but also on the damping induced by the orifice on the OWC system [71]. To quantify its influence, the dimensionless damping coefficient (B * ) can be defined, following [49], as…”

Section: Discussionmentioning

confidence: 99%

“…The design of the model (Figure 3) considered the limitations of the experimental facility-e.g., the wave maker capabilities and main dimensions of the flume [49], and tank blockage effects [50]-together with various guidelines and recommended practices for physical modelling of WECs [51,52]. A jacket-frame substructure proposed by [53] was considered to define the model for a 50 m water depth site [54].…”

Section: The Physical Modelmentioning

confidence: 99%

“…The duration of the tests was defined to cover at least 100 waves. Series B defines six sea states using a joint North Sea wave project (JONSWAP) spectrum [49], to study the hydrodynamic response of the device under irregular waves. The experimental programme was defined for a range of regular and irregular wave conditions and three different orifice sizes-note that for irregular waves, only the intermediate orifice size was used.…”

Section: Experimental Set-up and Testing Programmementioning

confidence: 99%

Section: Experimental Set-up and Testing Programmementioning

confidence: 99%

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A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

2018

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Abstract:The growth of the offshore wind industry in the last couple of decades has made this technology a key player in the maritime sector. The sustainable development of the offshore wind sector is crucial for this to consolidate within a global scenario of climate change and increasing threats to the marine environment. In this context, multipurpose platforms have been proposed as a sustainable approach to harnessing different marine resources and combining their use under the same platform. Hybrid wind-wave systems are a type of multipurpose platform where a single platform combines the exploitation of offshore wind and wave energy. In particular, this paper deals with a novel hybrid wind-wave system that integrates an oscillating water column wave energy converter with an offshore wind turbine on a jacket-frame substructure. The main objective of this paper is to characterise the hydrodynamic response of the WEC sub-system of this hybrid energy converter. A 1:50 scale model was tested under regular and irregular waves to characterise the hydrodynamic response of the WEC sub-system. The results from this analysis lead to the proof of concept of this novel hybrid system; but additionally, to characterising its behaviour and interaction with the wave field, which is a requirement for fully understanding the benefits of hybrid systems.

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Section: Discussionmentioning

confidence: 99%

Section: The Physical Modelmentioning

confidence: 99%

Section: Experimental Set-up and Testing Programmementioning

confidence: 99%

Section: Experimental Set-up and Testing Programmementioning

confidence: 99%

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A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

2018

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“…The solution to this issue for the Uppsala WEC has been investigated [2]. However, the same problem is also experienced by other wave energy technologies, such as oscillating water columns as described in [3,4], and in more general terms by WECs which have a part that is fixed in position relative to the seabed and a part that moves with the waves. Well-known point absorbers, such as Carnergie CETO [5], Ocean Power Technologies (OPT) Powerbuoy [6], and Archimedes Wave Swing [7] are challenged by the presence of tides, either because of a limited stroke length or because of the exponential decrease in available energy with depth.…”

Section: Introductionmentioning

confidence: 99%

Impact of Tidal Level Variations on Wave Energy Absorption at Wave Hub

Castellucci

Waters

2016

Energies

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Abstract:The energy absorption of the wave energy converters (WEC) characterized by a limited stroke length -like the point absorbers developed at Uppsala University-depends on the sea level variation at the deployment site. In coastal areas characterized by high tidal ranges, the daily energy production of the generators is not optimal. The study presented in this paper quantifies the effects of the changing sea level at the Wave Hub test site, located at the south-west coast of England. This area is strongly affected by tides: the tidal height calculated as the difference between the Mean High Water Spring and the Mean Low Water Spring in 2014 was about 6.6 m. The results are obtained from a hydro-mechanic model that analyzes the behaviour of the point absorber at the Wave Hub, taking into account the sea state occurrence scatter diagram and the tidal time series at the site. It turns out that the impact of the tide decreases the energy absorption by 53%. For this reason, the need for a tidal compensation system to be included in the design of the WEC becomes compelling. The economic advantages are evaluated for different scenarios: the economic analysis proposed within the paper allows an educated guess to be made on the profits. The alternative of extending the stroke length of the WEC is investigated, and the gain in energy absorption is estimated.

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Multi-chamber oscillating water column wave energy converters and air turbines: A review

2018

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Summary The oscillating water column (OWC) is a more common type of wave energy converter (WEC) that has been the subject of the study and development for several decades. Multi–chamber oscillating water column (MC–OWC) devices or arrays have the advantage of being more efficient in energy extraction compared to a single chamber system, particularly in more chaotic sea states. A variety of single and array OWC devices have been proposed and studied on a small–scale, whereas few large–scale devices have been tested under ocean wave conditions. This paper provides a concise review of the current state of MC–OWC device development in laboratory conditions. The review highlights explicitly the main stages of MC–OWC device development for one ongoing study as an example. This review was based on the available information in the literature from 2003 to 2012, in addition, further work is presented as part of the current study at the University of Technology Sydney. This study is from 2015 to 2018. The discussion shows the challenges that a device needs to overcome to be more competitive with other WECs in the global of wave energy converter area.

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Performance of OWC wave energy converters: influence of turbine damping and tidal variability

Cited by 106 publications

References 45 publications

A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

Impact of Tidal Level Variations on Wave Energy Absorption at Wave Hub

Multi-chamber oscillating water column wave energy converters and air turbines: A review

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