Efficiency of biradial impulse turbines concerning rotor blade angle, guide-vane deflection and blockage

Ferreira, Denise de Brum; Gato, L.M.C.; Eça, Luís

doi:10.1016/j.energy.2022.126390

Cited by 5 publications

(1 citation statement)

References 39 publications

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“…A self-rectifying biradial impulse turbine was designed [8] and manufactured to equip this WEC, see Fig. 2 (right).…”

Section: A Proposed Off-grid Owc Wave Energy Convertermentioning

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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“…A self-rectifying biradial impulse turbine was designed [8] and manufactured to equip this WEC, see Fig. 2 (right).…”

Section: A Proposed Off-grid Owc Wave Energy Convertermentioning

confidence: 99%