Hydraulic Performance of an Innovative Breakwater for Overtopping Wave Energy Conversion

Iuppa, Claudio; Contestabile, Pasquale; Cavallaro, Luca; Foti, Enrico; Vicinanza, Diego

doi:10.3390/su8121226

Cited by 48 publications

(52 citation statements)

References 29 publications

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“…Finally, overtopping devices capture the water close to the wave crest when it breaks against a structure that includes a relatively large reservoir. A hydraulic pump coupled to an electric generator installed underneath the reservoir converts the potential energy of the stored water into electricity [5].…”

Section: Introductionmentioning

confidence: 99%

Validating a Wave-to-Wire Model for a Wave Energy Converter—Part II: The Electrical System

2017

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Abstract:The incorporation of the full dynamics of the different conversion stages of wave energy converters (WECs), from ocean waves to the electricity grid, is essential for a realistic evaluation of the power flow in the drive train. WECs with different power take-off (PTO) systems, including diverse transmission mechanisms, have been developed in recent decades. However, all the different PTO systems for electricity-producing WECs, regardless of any intermediate transmission mechanism, include an electric generator, linear or rotational. Therefore, accurately modelling the dynamics of electric generators is crucial for all wave-to-wire (W2W) models. This paper presents the models for three popular rotational electric generators (squirrel cage induction machine, permanent magnet synchronous generator and doubly-fed induction generator) and a back-to-back (B2B) power converter and validates such models against experimental data generated using three real electric machines. The input signals for the validation of the mathematical models are designed so that the whole operation range of the electrical generators is covered, including input signals generated using the W2W model that mimic the behaviour of different hydraulic PTO systems. Results demonstrate the effectiveness of the models in accurately reproducing the characteristics of the three electrical machines, including power losses in the different machines and the B2B converter.

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Section: Introductionmentioning

confidence: 99%

Validating a Wave-to-Wire Model for a Wave Energy Converter—Part II: The Electrical System

2017

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“…Results (Iuppa et al, 2016) showed a slight reduction (~20%) of the mean water discharge in the front reservoir and at the rear side of the structure for the configuration with curved ramp compared with planar ramp. The device with a planar ramp, although would lead to higher crest of the vertical wall in the design process, has a higher performance in terms of energy production of the system.…”

Section: Campaign Test Aau2014mentioning

confidence: 96%

“…Design formulas have been provided by Iuppa et al (2016) taking into account the effect of the new geometrical parameters analyzed in test AAU2014. A synthesis of the hydraulic formulas for the configuration with planar ramp is here presented, while the results regarding the wave loading acting on the device and the design formulas are given in Contestabile et al (2017a).…”

Section: Campaign Test Aau2014mentioning

confidence: 99%

“…The relations for γ β and γ b can be found following the instructions presented into the EurOtop (EurOtop, 2007). Regarding the parameters γ f , due to the configuration of the device with a smooth impermeable ramp only located on the higher part of the armor layer, a new formula is proposed by Iuppa et al (2016): Although the physical modeling in a laboratory is still the key in the design of coastal structures, it is worth considering that the use of the models in small scale for complex structures is not always sufficient to obtain the complete structural response of a marine structure. For example, during violent wave impacts with very short duration, the compressibility of the air pocket can strongly influence the magnitude of the generated pressure, thus the local pressure can not be simply scaled by Froude.…”

Section: Campaign Test Aau2014mentioning

confidence: 99%

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Full-Scale Prototype of an Overtopping Breakwater for Wave Energy Conversion

Contestabile

Ferrante

Lauro

et al. 2017

Int. Conf. Coastal. Eng.

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The Overtopping BReakwater for Energy Conversion (OBREC) is a new typology of overtopping wave energy converter (OTD) integrated into a traditional rubble mound breakwater. The device can be considered as an innovative non-conventional breakwater that has the same functions as the traditional structures with the addedvalued of the energy production. The paper presents a comprehensive overview of the OBREC, offering a synthesis of the complete design process, from the results of the two complementary test campaigns in small scale carried out in 2012 and 2014 at Aalborg University, to the description of the full-scale device installed in Naples in 2016. The device represents the first OTD device in full-scale integrated into an existing rubble mound breakwater and it has been equipped by an instrumental apparatus to measure its response to the wave interaction. The monitoring of the full-scale device in the port of Naples, particularly during storm conditions, is aimed to study the scaling effects in wave loading and the overall performance of this breakwater-integrated OTD, included performance in terms of the energy production.

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“…The device is denominated OBREC (Overtopping BReakwater for Energy Conversion) and represents the world's first WEC prototype, completely embedded into a breakwater, which exploits the wave overtopping process [27,31]. It was installed inside an existing breakwater in an area of 75 m 2 , replacing part of the seaward armor layer.…”

Section: Introductionmentioning

confidence: 99%

Wave Energy Exploitation System Integrated in the Coastal Structure of a Mediterranean Port

2016

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A feasibility study for installing Wave Energy Converters (WECs) in a Mediterranean port is presented here. The final aim is to evaluate the possibility of building a green touristic infrastructure in a site having ordinary wave energy. In particular, the site of interest is Giardini Naxos, which is located in the northern Ionian coast of the island of Sicily (Italy). A preliminary estimation of the available energy has been carried out. The chosen type of WEC device is the Oscillating Water Column (OWC) system, which is found here to allow for good integration with the vertical breakwater needed for the extension of the existing port. Its feasibility is evaluated from the structural and economic point of view. Towards this aim, the system is tested in the laboratory for estimating the reflection coefficients and the pressures on the structure, which allow us to carry out the optimization of the OWC breakwater. Furthermore, the air turbine noise is estimated and an attenuation chamber is designed to reduce such noise to within acceptable levels. The economic feasibility study allows for an evaluation of the recuperation period of the investment, which is slightly less than the service life of the WEC device.

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Hydraulic Performance of an Innovative Breakwater for Overtopping Wave Energy Conversion

Cited by 48 publications

References 29 publications

Validating a Wave-to-Wire Model for a Wave Energy Converter—Part II: The Electrical System

Validating a Wave-to-Wire Model for a Wave Energy Converter—Part II: The Electrical System

Full-Scale Prototype of an Overtopping Breakwater for Wave Energy Conversion

Wave Energy Exploitation System Integrated in the Coastal Structure of a Mediterranean Port

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