Latching and Declutching Control of the Solo Duck Wave-Energy Converter with Different Load Types

Wu, Jinming; Yao, Yingxue; Zhou, Liang; Göteman, Malin

doi:10.3390/en10122070

Cited by 10 publications

(6 citation statements)

References 32 publications

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“…Active controls differs from passive controls. In active control, power has to be supplied either externally from the produced power by the WEC for controlling the primary wave energy absorber [103,104], while latching and declutching are examples of the passive control methods of a WEC, and are very common in WEC optimization studies [105,106]. Latching control is achieved by holding the heaving WEC in a fixed position when the velocity is zero and releasing the WEC at the right time so that its velocity can be in phase with the excitation force, so that resonance is achieved [107].…”

Section: Active and Passive Control To Increase Efficiencymentioning

confidence: 99%

Review on Power Performance and Efficiency of Wave Energy Converters

Aderinto

2019

Energies

149

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The level of awareness about ocean wave energy as a viable source of useful energy has been increasing recently. Different concepts and methods have been suggested by many researchers to harvest ocean wave energy. This paper reviews and compares the efficiencies and power performance of different wave energy converters. The types of analyses used in deriving the reported efficiencies are identified, and the stage of the power conversion processes at which the efficiencies were determined is also identified. In order to find a common way to compare the efficiencies of different technologies, the hydrodynamic efficiency in relation to the characteristic width of the wave energy converters and the wave resource potential are chosen in this paper. The results show that the oscillating body systems have the highest ratio in terms of the efficiency per characteristic width, and overtopping devices have the lowest. In addition, with better understanding of the devices' dynamics, the efficiencies of the newer oscillating water column and body systems would increase as the potential wave energy level increases, which shows that those newer designs could be suitable for more potential locations with large variations in wave energy potentials. At last, discussion about the cost of ocean wave energy is presented as well.

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Section: Active and Passive Control To Increase Efficiencymentioning

confidence: 99%

Review on Power Performance and Efficiency of Wave Energy Converters

Aderinto

2019

Energies

149

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“…Derivative-free optimization was used by Feng and Kerrigan [35] to determine the ideal latching duration for a heaving buoy WEC. A golden-section search algorithm was recently used by Wu et al [36] to numerically search for the ideal latching duration for a solitary duck WEC with various load types. They also explored the performance enhancement brought on by the latching control and its real-time implementation [37].…”

Section: Introductionmentioning

confidence: 99%

Wave Energy Converters and Hydraulic Power Take-off: analysis of a possible control strategy

Barone,

Castiglione,

Bova

2023

J. Phys.: Conf. Ser.

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Wave energy conversion is one of the most promising but untapped worldwide technologies. In fact, wave energy is clean and renewable as the solar and wind ones, but also less mature and utilized. Moreover, several Wave Energy Converters (WECs) patents have been developed in the last decades, as evidence of the great potential beneath these systems. Among the different issues related to this technology, the most challenging is controlling such systems. Maximizing the captured energy is indeed the main goal of a WEC’s control mechanism. As for single-mode oscillating absorbers, it has been proven that a resonance condition between body velocity and excitation force must be achieved. This control solution is generally called phase control. Different phase control strategies have been realized since the 1970s and latching control is one of them. However, how to implement sub-optimal phase control in real seas remains an open problem. A numerical model of the wave energy converter and its power take-off system is proposed in this paper. More precisely, the model simulates the hydrodynamics of a WEC point absorber coupled with a hydraulic Power Take Off in regular waves. Additionally, a parametric latching control strategy is suggested to enhance the converter’s power capture performance.

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“…In order to capture considerable power outside the resonance frequency band, different optimization methods have been proposed and investigated. Some optimization methods include changes made to the shape and dimensions of the buoy [30], while latching and declutching methods [31] are also used in some existing studies. Latching control is achieved by holding the heaving WEC in a fixed position when the velocity is zero and releasing it at the right time so that its velocity can be in phase with the excitation force to achieve resonance [32].…”

Section: Introductionmentioning

confidence: 99%

“…Latching control is achieved by holding the heaving WEC in a fixed position when the velocity is zero and releasing it at the right time so that its velocity can be in phase with the excitation force to achieve resonance [32]. On the other hand, declutching works by alternatively switching the power take off system on and off [31]. Another method is the model predictive control.…”

Section: Introductionmentioning

confidence: 99%

Effect of Spatial and Temporal Resolution Data on Design and Power Capture of a Heaving Point Absorber

Aderinto

2020

Sustainability

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For a heaving point absorber to perform optimally, it has to be designed to resonate to the prevailing ocean wave period. Hence, it is important to make the ocean wave data analysis to be as accurate as possible. In this study, existing wave condition data is used to investigate the effect of the temporal resolution (daily vs. hourly) of wave data on the design of the device and power capture. The temporal resolution effect on the estimation of ocean wave resource theoretical potential is also investigated. Results show that the temporal resolution variation of the ocean wave data affects the design of the device and its power capture, but the theoretical power resource assessment is not significantly affected. The device designed for the Gulf of Mexico is also analyzed with wave condition in Oregon, which has about 40 times the wave resource theoretical potential compared to the Gulf of Mexico. The results confirmed that a device should be designed for a specific location as the device performed better in the Gulf of Mexico, which has much less ocean wave resource theoretical potential. At last, the effect of the design, diameter and season (summer and winter) on the power output of the device is also investigated using statistical hypothesis testing methods. The results show that the power capture of a device is significantly affected by these parameters.

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Latching and Declutching Control of the Solo Duck Wave-Energy Converter with Different Load Types

Cited by 10 publications

References 32 publications

Review on Power Performance and Efficiency of Wave Energy Converters

Review on Power Performance and Efficiency of Wave Energy Converters

Wave Energy Converters and Hydraulic Power Take-off: analysis of a possible control strategy

Effect of Spatial and Temporal Resolution Data on Design and Power Capture of a Heaving Point Absorber

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