Design and performance test of hydraulic PTO for wave energy converter

Choi, Kwansik; Yang, Dong-Soon; Park, Shin-Yeol; Cho, Byung-Hak

doi:10.1007/s12541-012-0105-4

Cited by 27 publications

(14 citation statements)

References 9 publications

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“…It is necessary to improve the PTO system for removing the residual air in the hydraulic cylinder. As it is measured by Choi [26], the residual air captured in a hydraulic cylinder can reach up to 15.7% of its volume, which is a considerable quantity.…”

Section: Hydraulic Cylinder Pressurization Timementioning

confidence: 91%

Design, Construction and Testing of a Hydraulic Power Take-Off for Wave Energy Converters

Lasa¹,

Antolin²,

Angulo³

et al. 2012

Energies

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This paper presents the construction, mathematical modeling and testing of a scaled universal hydraulic Power Take-Off (PTO) device for Wave Energy Converters (WECs). A specific prototype and test bench were designed and built to carry out the tests. The results obtained from these tests were used to adjust an in-house mathematical model. The PTO was initially designed to be coupled to a scaled wave energy capture device with a low speed and high torque oscillating motion and high power fluctuations. Any Energy Capture Device (ECD) that fulfils these requirements can be coupled to this PTO, provided that its scale is adequately defined depending on the rated power of the full scale prototype. The initial calibration included estimation of the pressure drops in the different components, the pressurization time of the oil inside the hydraulic cylinders and the volumetric efficiency of the complete circuit. Since the overall efficiency measured during the tests ranged from 0.69 to 0.8 and the dynamic performance of the PTO was satisfactory, the results are really promising and it is believed that this solution might prove effective in real devices. Keywords

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Section: Hydraulic Cylinder Pressurization Timementioning

confidence: 91%

Design, Construction and Testing of a Hydraulic Power Take-Off for Wave Energy Converters

Lasa¹,

Antolin²,

Angulo³

et al. 2012

Energies

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“…Also, the power quality and generation efficiency of the hydraulic PTO system is improved. Other examples of hydraulic PTO force control strategy based on a hydraulic accumulator with an active control valve are presented in [47,67,72,75,88,103].…”

Section: Hydraulic Accumulator With An Active Control Valve Mechanismmentioning

confidence: 99%

Hydraulic Power Take-Off Concepts for Wave Energy Conversion System: A Review

et al. 2019

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Ocean wave energy is one of the most abundant energy sources in the world. There is a wide variety of wave energy conversion systems that have been designed and developed, resulting from the different ways of ocean wave energy absorption and also depending on the location characteristics. This paper reviews and analyses the concepts of hydraulic power take-off (PTO) system used in various types of wave energy conversion systems so that it can be a useful reference to researchers, engineers and inventors. This paper also reviews the control mechanisms of the hydraulic PTO system in order to optimise the energy harvested from the ocean waves. Finally, the benefits and challenges of the hydraulic PTO system are discussed in this paper.

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“…The OB-type WECs exploit powerful wave regimes available in deep water and have smaller size, which have become popular and develop rapidly in recent years, such as PowerBuoy (Edwards and Mekhiche, 2013), Wavebob (Schlemmer et al, 2011), Archimedes Wave Swing (Valério et al, 2007), CETO (Caljouw et al, 2011), Oyster (Babarit et al, 2012;Fadaeenejad et al, 2014), Salter's Duck (Salter et al, 1976;Greenhow et al, 1982), and Pelamis (Czech and Bauer, 2012;Yemm et al, 2012). Laboratory experiments can provide convincing and useful data for designers and engineers (Choi et al, 2012;Lasa et al, 2012;Qu, 2015). Based on the validation of experimental data, the numerical model can realize the prediction from the incident wave energy to the output electric power directly.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Power Take-off System for a Heaving Buoy Wave Energy Converter

Cao

Shi

et al. 2020

J. Ocean Univ. China

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The heaving buoy wave energy device is popular for wave conditions with small wave heights and short periods. This paper presents the design of a wave energy converter composed of a gyro buoy, a hydraulic power take-off, and an electricity generation system. The energy accumulators are used to improve the output power with different control strategies. The quantity relations between each component are established using theoretical methods. The simulation model describes the energy conversion and calculates the operation time, energy capacity, and output power of the device under different initial pressures, release pressures, and electric resistances. As a result, the capacity is determined by the electronic load, and the maximum output power can be obtained when the accumulators are turned on and off at the same time. This study investigates the factors influencing the electric energy production and can be used to guide the optimization of this type of device.

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Design and performance test of hydraulic PTO for wave energy converter

Cited by 27 publications

References 9 publications

Design, Construction and Testing of a Hydraulic Power Take-Off for Wave Energy Converters

Design, Construction and Testing of a Hydraulic Power Take-Off for Wave Energy Converters

Hydraulic Power Take-Off Concepts for Wave Energy Conversion System: A Review

Simulation of the Power Take-off System for a Heaving Buoy Wave Energy Converter

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