Design and optimization of a wave energy converter for drifting sensor platforms in realistic ocean waves

Harms, Julius; Hollm, Marten; Dostal, Leo; Kern, Thorsten A.; Seifried, Robert

doi:10.1016/j.apenergy.2022.119303

Cited by 15 publications

(4 citation statements)

References 48 publications

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“…This can be done, for by simulating the behavior of the mechanical system in different irregular seas with different peak frequencies and checking at which system parameters the sum of all harvested powers becomes high. Such an optimization process has been performed in [19] for a drifting sensor platform. Since only a few system parameters have to be optimized in this study, the gradient can be calculated via finite difference methods.…”

Section: Results For Irregular Wavesmentioning

confidence: 99%

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Investigation of the dynamics of a multibody wave energy converter excited by regular and irregular waves

et al. 2022

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Section: Results For Irregular Wavesmentioning

confidence: 99%

“…Since the relative motion between the CFBs and the frame is linear, a direct-drive linear generator can be used for energy harvesting, cf. [18,19]. But also the use of rotation based generators for energy harvesting is possible.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the dynamics of a multibody wave energy converter excited by regular and irregular waves

et al. 2022

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“…In fact, for α > 1, Equation (6) becomes negative, which means that the EH transducer, on average, would drain the power instead of producing it. The value of Equation ( 5) is also higher than Equation (6). So, whenever the sampling rate cannot be conveniently increased, a better strategy is to fix v MPP to V dc /2 to achieve Equation (5).…”

Section: Rt Vt Vomentioning

confidence: 99%

“…WECs are commonly used to expand the autonomy of free-floating monitoring buoys (e.g., drifters) and many of them have been recently reported. Reference [6] describes an electromagnetic converter that captures energy from the relative motion between a drogue and a drifter, achieving tens of milliwatts of average power in a simulation test. Reference [7] presents an electromagnetic-based swing body that achieved power peaks of 0.13 W under real waves of 0.8 m height.…”

Section: Introductionmentioning

confidence: 99%

Power Gain from Energy Harvesting Sources at High MPPT Sampling Rates

Gasulla

Carandell

2023

Sensors

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Energy harvesting (EH) sources require the tracking of their maximum power point (MPP) to ensure that maximum energy is captured. This tracking process, performed by an MPP tracker (MPPT), is performed by periodically measuring the EH transducer’s output at a given sampling rate. The harvested power as a function of the sampling parameters has been analyzed in a few works, but the power gain achieved with respect to the case of a much slower sampling rate than the EH source’s frequency has not been assessed so far. In this work, simple expressions are obtained that predict this gain assuming a Thévenin equivalent for the EH transducer. It is shown that the power gain depends on the relationship between the square of AC to DC open circuit voltage of the EH transducer. On the other hand, it is proven that harvested power increases, using a suitable constant signal for the MPP voltage instead of tracking the MPP at a low sampling rate. Experimental results confirmed the theoretical predictions. First, a function generator with a series resistor of 1 kΩ was used, emulating a generic Thévenin equivalent EH. Three waveform types were used (sinus, square, and triangular) with a DC voltage of 2.5 V and AC rms voltage of 0.83 V. A commercial MPPT with a fixed sampling rate of 3 Hz was used and the frequency of the waveforms was changed from 50 mHz to 50 Hz, thus effectively emulating different sampling rates. Experimental power gains of 11.1%, 20.7%, and 7.43% were, respectively, achieved for the sinus, square, and triangular waves, mainly agreeing with the theoretical predicted ones. Then, experimental tests were carried out with a wave energy converter (WEC) embedded into a drifter and attached to a linear shaker, with a sinus excitation frequency of 2 Hz and peak-to-peak amplitude of 0.4 g, in order to emulate the drifter’s movement under a sea environment. The WEC provided a sinus-like waveform. In this case, another commercial MPPT with a sampling period of 16 s was used for generating a slow sampling rate, whereas a custom MPPT with a sampling rate of 60 Hz was used for generating a high sampling rate. A power gain around 20% was achieved in this case, also agreeing with the predicted gain.

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How to Generate Electricity From Waves – Principles of Wave Energy Converters

Giorgi

2024

Encyclopedia of Renewable Energy, Sustainability and the Environment

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Design and optimization of a wave energy converter for drifting sensor platforms in realistic ocean waves

Cited by 15 publications

References 48 publications

Investigation of the dynamics of a multibody wave energy converter excited by regular and irregular waves

Investigation of the dynamics of a multibody wave energy converter excited by regular and irregular waves

Power Gain from Energy Harvesting Sources at High MPPT Sampling Rates

How to Generate Electricity From Waves – Principles of Wave Energy Converters

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