Sea trial results of the biradial and Wells turbines at Mutriku wave power plant

Gato, L.M.C.; Henriques, J.C.C.; Carrelhas, A.A.D.

doi:10.1016/j.enconman.2022.115936

Cited by 13 publications

(3 citation statements)

References 65 publications

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“…Laboratory models can cope with this limitation, but it becomes impractical to equip sea-faring prototypes with torque meters due to their susceptibility to dynamic sea-state conditions and associated energetic transient regimes. A torque calculation method from measured electrical variables for a grid-connected biradial turbine with a squirrel-cage induction generator and a back-to-back converter was introduced [15] and successfully applied in sea-trials [16]. The first objective of the present work was to derive the relationship between the selected generator's counter torque and the rectifier's output current from experimental testing.…”

Section: B Objectivesmentioning

confidence: 99%

Permanent Magnet Generator Testing for Low-Power Off-Grid Oscillating Water Column Wave Energy Converters

Ferreira,

Gato,

Henriques

2024

IEEE Trans. Energy Convers.

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This work concerns the development of an offgrid oscillating-water-column wave energy converter (WEC) equipped with internal batteries designed for powering sensors and autonomous vehicles. Calculating the generator counter torque from electrical measurements is advantageous due to mechanical constraints with torque meters in sea-faring prototypes. Mapping generator performance concerning load and speed enables advanced wave-to-wire modeling for controller and battery charger design. Experimental testing involved the WEC's permanent magnet generator, diode rectifier, and capacitive filter across combinations of rotational speeds and resistive loads, yielding the generator-rectifier electromechanical input-output relationship. This relationship yielded a steady-state efficiency with differences below 1% to measured values for representative loads, and it reproduces time series of the modeled variables in speed-varying conditions with good accuracy. Some drawbacks of passive rectification, compared to active, were assessed. The power factor ranged from 0.92 to 0.95, and generator-rectifier efficiency ranged from 0.83 to 0.93 over the range of 20 to 100% of the generator's continuous duty torque. Additionally, the maximum observed direct-axis current reached 8% of the demagnetization limit. Finally, the highest observed generatorrectifier efficiency of 91% occurred at the maximum tested speed of 3000 r/min.

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Section: B Objectivesmentioning

confidence: 99%

Permanent Magnet Generator Testing for Low-Power Off-Grid Oscillating Water Column Wave Energy Converters

Ferreira,

Gato,

Henriques

2024

IEEE Trans. Energy Convers.

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“…Renewables, as an alternative to decarbonize the energy sector, have shown to be a significant technological development over the last decades because of the progress in wind and photovoltaic technologies [6]. However, other renewable energy technologies require more research and development in order for their use to spread, such as marine energies [7]. Wave power and marine current energy depend on the interaction of winds, waves, and sea currents, where the energy conversion from kinetic potential depends on the water depth and sea state transitions [8].…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, transient marine currents have a similar effect on marine energy production as transient wind gust does on wind energy because unexpected changes in current velocities (i.e., nonlinear and turbulent) over short-term periods affect the hydrodynamic field [12,13]. The design and optimization of hydrokinetic turbines [13,14] and wave power converters [7] should consider these transient changes in the local hydrodynamics generated during low sea states. The generation of transient current accelerations has been identified in internal solitary waves through ADCP (acoustic Doppler current profilers) measurements [15], where kinetic and viscous parameters have been analyzed [16].…”

Section: Introductionmentioning

confidence: 99%

Hydrokinetic Energy and Transient Accelerations of Marine Currents in Colombian Nearshore Waters

Rueda-Bayona,

Cabello Eras,

Caicedo-Laurido

et al. 2023

Water

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The transient acceleration of ocean currents, or internal waves, is hard to detect, because it does not have climate variability or regular manifestation in the sea. This fluctuation affects not only short-term oceanographic processes but also the hydrokinetic generation of power and the structural health of ocean technologies. Identifying and understanding the mechanisms that generate internal waves require long-term data on the kinetic and viscous–turbulent parameters of the water column measured over long intervals. In this sense, this study analyzed current profiles in nearshore waters (8.9 m depths) measured over six months in the Colombian Caribbean Sea and found internal waves due to the manifestation of transient acceleration propagating in two of the three layers of the water column. The analyzed time series of currents and turbulent kinetic profiles evidenced that transient waves occurred during changes in the surface winds. The applied methodology in this research allowed, for the first time in the study area, the detection of transient accelerations (±0.25 m/s2) that modified the hydrokinetic energy of the water column over short-term periods (6–24 h).

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Estimation of generator electrical power output and turbine torque in modelling and field testing of OWC wave energy converters

Carrelhas

Gato

Henriques

et al. 2023

Energy Conversion and Management: X

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Sea trial results of the biradial and Wells turbines at Mutriku wave power plant

Cited by 13 publications

References 65 publications

Permanent Magnet Generator Testing for Low-Power Off-Grid Oscillating Water Column Wave Energy Converters

Permanent Magnet Generator Testing for Low-Power Off-Grid Oscillating Water Column Wave Energy Converters

Hydrokinetic Energy and Transient Accelerations of Marine Currents in Colombian Nearshore Waters

Estimation of generator electrical power output and turbine torque in modelling and field testing of OWC wave energy converters

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