Review of hydraulic transmission technologies for wave power generation

Lin, Yaolin; Bao, Jingwei; Liu, Hongwei; Li, Wei; Tu, Le; Zhang, Dahai

doi:10.1016/j.rser.2015.04.141

Cited by 83 publications

(34 citation statements)

References 30 publications

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“…Recently, a variety of hydraulic PTO concepts have been suggested in the literature for numerous types of wave energy conversion system, as reviewed in [57,58]. Identifying specific characteristics of different hydraulic PTO concepts is necessary to understand the advantages, limitations and complexity associated with the implementation.…”

Section: Multi-concepts Of Hydraulic Power Take-off Systemmentioning

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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Section: Multi-concepts Of Hydraulic Power Take-off Systemmentioning

confidence: 99%

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

et al. 2019

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“…This flywheel stores and discharges kinetic energy and absorbs the impact forces generated by the reciprocating motion of the pump pistons (component 7). This smoothing process has, for example, a positive impact on the efficiency of the hydraulic cylinders [26] and on the efficiency of Wells turbine [27].…”

Section: Gearbox and Flywheelmentioning

confidence: 99%

Speed control of oil-hydraulic power take-off system for oscillating body type wave energy converters

et al. 2016

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a b s t r a c tThe variable displacement oil-hydraulic pumps for the Power Take-Off (PTO) of wave energy converters must work above 80% of maximum displacement in order to have an overall efficiency of approximately 94.5%. This is achieved by controlling their rotational speed when the oil-hydraulic power fluctuates in time. Three speed control strategies have been presented, the first fixing the maximum possible speed in each sea state, the second by slowly varying the pump speed between speed peak values and average ones, and the third by working with highly variable speed reference values. The worst pump efficiency is achieved with the first strategy while the best one with the third strategy. However, the first has less impact than the third one in the pump lifecycle. On the other hand, the second strategy is used to make a trade-off between pump efficiency and lifecycle. However, this paper presents a fourth speed control strategy, which is a hybrid of the second and third strategies. So, the objectives of this paper were to know if these strategies are implementable in a test rig and also on a new PTO concept and determining what modifications should be introduced in these PTO strategies and hardware. This paper also contributes with the application of new methodologies in this field of research for the modelling of pump efficiency and pressure control, such as Neuro-Fuzzy modelling and Fuzzy Logic control systems.

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“…There is no need for an input from the man fabricate the power and that will always be counted on [44]. In addition to this, with the development of power from the waves, dissimilar to fossil fuels, it results in no dangerous byproducts like waste, pollution and gas [45]. The energy from waves can be directly taken into the machinery producing electricity emulated by the utilization to the power plants and power generators as well.…”

Section: Advantages Of Wave Energymentioning

confidence: 99%

Easing Climate Change with Recent Wave Energy Technologies

Zullah¹,

Jae-Ung²,

Lee³

2016

J Fundam Renewable Energy Appl

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More than 80% of electric power production throughout the world originates from the fossil fuelled plants. In accordance with the anticipation for increase in the demand for electricity, there is certainly a need to determine a new method to utilize renewable sources for extracting electric energy through renewable sources. In today's world, the supply of renewable electric energy is found to be one of the significant priorities within numerous parts of the world. The significant proof of this incorporates the last agreement at Marrakech 2002 and the Kyoto declaration during 1997. Both the US and EU have already developed their focus on the future emissions of greenhouse gases. It should be noted that ocean waves makes a representation of a significant source of unexplored renewable energy. Within the EU, the potential of wave energy has been conservatively estimated as 120-190 TWh per year within offshores emulated by some additional 34-46 TWh per year within near shore locations. Moreover, such anticipations rely on presumptions of energy and technology cost. And, the genuine resource would get to be notably larger. In this particular case, it can be found to be a challenging task for converting such boundless energies within the ocean waves to the electric energy. However, a considerable attention should be paid to the economic constraints for the purpose of approaching future production of sustainable electric power production for the future. This study will discuss relevant aspects for the climate change which is found to be a global threat to the entire world. For this it is quite obvious that one of the significant cause of this is the emission of carbon within the atmosphere. For this global threat, there are numerous causes and one among them includes the emission of greenhouse gas as mentioned earlier. The study will also discuss as to how wave energy can be used to allow prevention of the carbon emissions within the atmosphere. Other than that, there would be appropriate discussions on the energy devices, policies, and protocols, regional and international developments.

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Review of hydraulic transmission technologies for wave power generation

Cited by 83 publications

References 30 publications

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

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

Speed control of oil-hydraulic power take-off system for oscillating body type wave energy converters

Easing Climate Change with Recent Wave Energy Technologies

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