On the power performance of a wave energy converter with a direct mechanical drive power take-off system controlled by latching

Shadman, Milad; Avalos, Gustavo O. Guarniz; Estefen, Segen F.

doi:10.1016/j.renene.2021.01.004

Cited by 23 publications

(13 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ecuador (1), wave; Guyana (1), wind; Peru (1), wave; and Venezuela (5), tidal, wave and wind are the other South American countries that have worked in this area. The majority of these works are associated with the resource assessment, for instance, [22][23][24][25], as well as topics such as techno-economic feasibility [26][27][28], device performance and application of control systems [29,30], resource variability [31,32], resource complementarity, such as wave energy and ocean current in Brazil as presented in [33]. Additionally, some researches address the environmental and economic impacts of ORE [34,35], investigate the regulatory aspects [36,37] and analyze the environmental licensing [38,39].…”

Section: Survey Of Technical Work and Referencesmentioning

confidence: 99%

“…In the totality of 107 scientific publications on ORE in Brazil, a total of 46 include offshore wind subjects, including theoretical, technical and economic potential assessment [22,28,[44][45][46], resource complementarity including hydropower, offshore wind and offshore solar [47,48], offshore wind environmental [34] and social [49] impacts and regulatory aspects [36]. Research about wave energy in Brazil started in 2000, focusing mainly on wave resource potential [50,51], wave-to-wire modeling [52], geometry optimization [53] and control systems and strategies [30,[54][55][56], experimental tests including dry tests [57] and reduced scale models in wave tank [58], economic feasibility [27] and environmental aspects [59] of WECs. Some works, including [31,60] and [23], are examples of studies that addressed tidal, ocean current and OTEC, respectively.…”

Section: Brazilmentioning

confidence: 99%

See 1 more Smart Citation

A Review of Offshore Renewable Energy in South America: Current Status and Future Perspectives

et al. 2023

Self Cite

View full text Add to dashboard Cite

This paper addresses the current status and future research and development perspectives associated with technologies to harness offshore renewable energy, including offshore wind, waves, tides, ocean currents, and thermal and salinity gradient, in South America (SA). It focuses on five countries: Argentina, Brazil, Chile, Colombia and Uruguay. At first, a comprehensive survey presents the number of scientific papers classified based on the resource to show the tendency and importance of such subjects in the academic community. Each country’s electricity matrix and grid connection are shown to understand the region’s renewable source participation situation. The potential of offshore renewable resources is addressed by considering the published technical papers in scientific journals. The main conflicts and synergies associated with ocean space utilization are presented by considering the exclusive economic zone of each country. The status of the regulatory frameworks to promote and development of offshore renewable energies is presented. Two sections are dedicated to presenting the active, decommissioned and planned projects, research groups and laboratory infrastructures to develop the technologies. The last section discusses the future perspectives on the development of this sector in SA. It is observed that SA, with more than 25,000 km of coastline, has a great potential for offshore renewable energy; however, so far, these resources have not been explored commercially. Larger investment in the sector, establishing an adequate legal framework and deploying full-scale demonstration projects at sea are necessary for the commercialization of such technologies in SA.

show abstract

Section: Survey Of Technical Work and Referencesmentioning

confidence: 99%

Section: Brazilmentioning

confidence: 99%

A Review of Offshore Renewable Energy in South America: Current Status and Future Perspectives

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…The detailed calculation of the drag coefficient is described in the Appendix. A reliable and single estimation of drag coefficient for high and low velocities of the floating body remains a challenge, as described in Kalofotias (2016), Giorgi and Ringwood (2017a), Ringwood (2017b), andAvalos andEstefen (2021). Therefore, the drag coefficient calculated according to Jin et al ( 2018) is a reference value to analyze the different parameters that influence the proposed PTO's performance.…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

“…The oscillating motion generates electrical current for the stator (Prado and Polinder 2013;Feng et al 2016). Direct-mechanical drive PTO is a system in which a typical design is to use a rack and a pinion gear to convert the vertical motion of the oscillating body to an oscillating rotational motion (Sanada et al 2012, Bihn et al 2016, Liang et al, 2017, Shadman et al 2021. Two one-way bearings are integrated into the system to convert bidirectional rotation into unidirectional rotation taking advantage of the electrical generator (Bihn et al 2016, Liang et al, 2017.…”

Section: Introductionmentioning

confidence: 99%

Application of the Latching Control System on the Power Performance of a Wave Energy Converter Characterized by Gearbox, Flywheel, and Electrical Generator

Avalos

Shadman

Estefen

2021

J. Marine. Sci. Appl.

Self Cite

View full text Add to dashboard Cite

The latching control represents an attractive alternative to increase the power absorption of wave energy converters (WECs) by tuning the phase of oscillator velocity to the wave excitation phase. However, increasing the amplitude of motion of the floating body is not the only challenge to obtain a good performance of the WEC. It also depends on the efficiency of the power take-off system (PTO). This study aims to address the actual power performance and operation of a heaving point absorber with a direct mechanical drive PTO system controlled by latching. The PTO characteristics, such as the gear ratio, the flywheel inertia, and the electric generator, are analyzed in the WEC performance. Three cylindrical point absorbers are also considered in the present study. A wave-to-wire model is developed to simulate the coupled hydro-electro-mechanical system in regular waves. The wave energy converter (WEC) performance is analyzed using the potential linear theory but considering the viscous damping effect according to the Morison equation to avoid the overestimated responses of the linear theory near resonance when the latching control system is applied. The latching control system increases the mean power. However, the increase is not significant if the parameters that characterize the WEC provide a considerable mean power. The performance of the proposed mechanical power take-off depends on the gear ratio and flywheel. However, the gear ratio shows a more significant influence than the flywheel inertia. The operating range of the generator and the diameter/draft ratio of the buoy also influence the PTO performance.

show abstract

“…Specifically for PAs, various recent studies point out the importance of the gene unit selection [29] focusing on the best materials to use [30,31] and on electromag PTO winding design [32]. Another key topic of research is the development of PTO co techniques to apply for significantly increasing the power absorption efficiency, e.g active or latching control strategies [33][34][35]. For what concerns numerical and experimental modelling of PAs, a limited nu of studies have been published so far.…”

Section: Point Absorber Wave Energy Convertersmentioning

confidence: 99%

A Novel 2-D Point Absorber Numerical Modelling Method

et al. 2021

View full text Add to dashboard Cite

Despite several wave energy converters (WECs) having been developed to present, no particular concept has emerged yet. The existing inventions vary significantly in terms of the operation principle and complexity of WECs. The tethered point absorbers (PAs) are among the most known devices that, thanks to their simplicity, appear to be cost-effective and reliable for offshore installation. These devices need to be advanced further and, therefore, new tailored modelling methods are required. Numerical modelling of this type of WEC has been done mainly in one degree of freedom. Existing methods for multi-degrees of freedom analysis lack pragmatism and accuracy. Nevertheless, modelling of multiple degrees of freedom is necessary for correct analysis of the device dynamic response, wave loads and device performance. Therefore, an innovative numerical method for two degrees of freedom analysis of PA WECs, which permits precisely modelling the dynamics of PA for surge and heave motions, is introduced in this paper. The new method allows assessing, in the time-domain, the dynamic response of tethered PAs using regular and irregular sea states. The novel numerical model is explained, proved and empirically validated.

show abstract

On the power performance of a wave energy converter with a direct mechanical drive power take-off system controlled by latching

Cited by 23 publications

References 28 publications

A Review of Offshore Renewable Energy in South America: Current Status and Future Perspectives

A Review of Offshore Renewable Energy in South America: Current Status and Future Perspectives

Application of the Latching Control System on the Power Performance of a Wave Energy Converter Characterized by Gearbox, Flywheel, and Electrical Generator

A Novel 2-D Point Absorber Numerical Modelling Method

Contact Info

Product

Resources

About