Performance assessment of the full scale ISWEC system

Bracco, Giovanni; Giorcelli, Ermanno; Giorgi, Giuseppe; Mattiazzo, Giuliana; Passione, Biagio; Raffero, Mattia; Vissio, Giacomo

doi:10.1109/icit.2015.7125466

Cited by 15 publications

(12 citation statements)

References 9 publications

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“…Regarding wave energy, to date most of the WECs installed are within 10 km from shore (the most distant WEC currently deployed at the Wave Hub in South West of the UK is located 16 km from shore) and no deeper than 75 m [10]. As mentioned before, some wave energy full-scale demonstration projects (of different principles of operation) have been developed in Italy (in Pantelleria and the Port of Naples); see [182][183][184][185][186].…”

Section: Bathymetry and Distance To Shorementioning

confidence: 99%

“…A (near) full-scale demonstration project has been described in detail in [182][183][184], where a full scale Inertial Sea Wave Energy Converter (ISWEC) prototype has been developed and tested in Pantelleria and its impact on Posidonia Oceanica meadows has been assessed. The rated power of ISWEC was 100 kW, and the mooring took place at 800 m from the coast in a water depth of 35 m. The principle of operation of ISWEC consists in the interaction of sea waves with the hull of the device and the gyroscopic system.…”

Section: Status Of Wave Energy Developmentmentioning

confidence: 99%

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Marine Renewable Energy in the Mediterranean Sea: Status and Perspectives

et al. 2017

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Abstract:In this work, an extended overview of the marine renewable energy in the Mediterranean Sea is provided as regards current status, potential problems, challenges, and perspectives of development. An integrated and holistic approach is necessary for the economic viability and sustainability of marine renewable energy projects; this approach comprises three different frameworks, not always aligned, i.e., geotechnical/engineering, socio-economic, and environmental/ ecological frameworks. In this context, the geomorphological, climatological, socio-economic, and environmental/ecological particularities of the Mediterranean basin are discussed, as they constitute key issues of the spatial context in which marine renewable energy projects are to be implemented. General guidelines for the sustainable development of marine renewable energy in the Mediterranean are also provided.Keywords: marine renewable energy; ocean energy; offshore wind energy; marine spatial planning; Mediterranean Sea; roadmap for marine energy development Key TopicsThe main topics that this paper deals with, can be summarized as follows: •Global status of the different types of marine renewable energy (MRE), i.e., offshore wind, wave, tidal, thermal, and salinity gradients energy conversion:

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Section: Bathymetry and Distance To Shorementioning

confidence: 99%

Section: Status Of Wave Energy Developmentmentioning

confidence: 99%

Marine Renewable Energy in the Mediterranean Sea: Status and Perspectives

et al. 2017

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“…where η 30 represents the heave motion amplitude, η 50 the pitch motion amplitude, A the encounter wave amplitude, and k the wave number. The experimental pitch and heave RAOs for both mooring configurations C1 and C2a, together with the numerical results obtained by ANSYS AQWA R with zero-forward speed and no-mooring conditions, are shown in Figures 13 and 14 as a function of the full scale wave period.…”

Section: Regular Wave Resultsmentioning

confidence: 99%

“…The first idea of the ISWEC (Inertial Sea Wave Energy Converter) device dates back to the 2006 and has been developed at the Polytechnic of Turin, following different stages from virtual modeling to experimental tests on scale models, as described in [27]. ISWEC is a fully-enclosed floating gyroscopic WEC, especially designed for the Mediterranean Sea [28][29][30][31]. The device presented in this paper is the 1 Degree-of-Freedom (DoF) ISWEC, a directional device brought from concept to full scale prototyping in Pantelleria in August 2015 [32].…”

Section: Iswec Devicementioning

confidence: 99%

Experimental Investigation of the Mooring System of a Wave Energy Converter in Operating and Extreme Wave Conditions

Sirigu

Bonfanti

Begović

et al. 2020

JMSE

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A proper design of the mooring systems for Wave Energy Converters (WECs) requires an accurate investigation of both operating and extreme wave conditions. A careful analysis of these systems is required to design a mooring configuration that ensures station keeping, reliability, maintainability, and low costs, without affecting the WEC dynamics. In this context, an experimental campaign on a 1:20 scaled prototype of the ISWEC (Inertial Sea Wave Energy Converter), focusing on the influence of the mooring layout on loads in extreme wave conditions, is presented and discussed. Two mooring configurations composed of multiple slack catenaries with sub-surface buoys, with or without clump-weights, have been designed and investigated experimentally. Tests in regular, irregular, and extreme waves for a moored model of the ISWEC device have been performed at the University of Naples Federico II. The aim is to identify a mooring solution that could guarantee both correct operation of the device and load carrying in extreme sea conditions. Pitch motion and loads in the rotational joint have been considered as indicators of the device hydrodynamic behavior and mooring configuration impact on the WEC.

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“…The non-linear system equations have been implemented in the MATLAB ® /Simulink ® environment employing the Simscape™ Multibody™ toolbox, which is particularly suitable for multi-physics system modelling. The derivation and the experimental validation of the model equations of the complete system is not within the scope of this work and details can be found in the studies of [18][19][20][21].…”

Section: Iswec Non-linear Time Domain Modelmentioning

confidence: 99%

Real-Time Wave Excitation Forces Estimation: An Application on the ISWEC Device

Bonfanti

Hillis

Sirigu

et al. 2020

JMSE

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Optimal control strategies represent a widespread solution to increase the extracted energy of a Wave Energy Converter (WEC). The aim is to bring the WEC into resonance enhancing the produced power without compromising its reliability and durability. Most of the control algorithms proposed in literature require for the knowledge of the Wave Excitation Force (WEF) generated from the incoming wave field. In practice, WEFs are unknown, and an estimate must be used. This paper investigates the WEF estimation of a non-linear WEC. A model-based and a model-free approach are proposed. First, a Kalman Filter (KF) is implemented considering the WEC linear model and the WEF modelled as an unknown state to be estimated. Second, a feedforward Neural Network (NN) is applied to map the WEC dynamics to the WEF by training the network through a supervised learning algorithm. Both methods are tested for a wide range of irregular sea-states showing promising results in terms of estimation accuracy. Sensitivity and robustness analyses are performed to investigate the estimation error in presence of un-modelled phenomena, model errors and measurement noise.

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Performance assessment of the full scale ISWEC system

Cited by 15 publications

References 9 publications

Marine Renewable Energy in the Mediterranean Sea: Status and Perspectives

Marine Renewable Energy in the Mediterranean Sea: Status and Perspectives

Experimental Investigation of the Mooring System of a Wave Energy Converter in Operating and Extreme Wave Conditions

Real-Time Wave Excitation Forces Estimation: An Application on the ISWEC Device

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