A multi-point-absorber wave-energy converter for the stabilization of output power

Do, Hoang-Thinh; Dang, Tri Dung; Ahn, Kyoung Kwan

doi:10.1016/j.oceaneng.2018.03.093

Cited by 36 publications

(16 citation statements)

References 20 publications

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“…In addition, the moment due to the HPTO unit, M PTO can be defined using Equations (3)- (5), where F PTO is the feedback force from the HPTO unit applied to the WEC device. The variables L 1 , L 2 , L 3 and L 4 are the lengths between point a, b, c and d, as illustrated in Figure 2 [30,[36][37][38]. x p is the displacement of hydraulic cylinder piston and L 3,0 is the initial stroke of the hydraulic cylinder.…”

Section: Hydrodynamic Motion Of the Floatermentioning

confidence: 99%

An Estimation of Hydraulic Power Take-off Unit Parameters for Wave Energy Converter Device Using Non-Evolutionary NLPQL and Evolutionary GA Approaches

et al. 2020

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This study is concerned with the application of two major kinds of optimisation algorithms on the hydraulic power take-off (HPTO) model for the wave energy converters (WECs). In general, the HPTO unit’s performance depends on the configuration of its parameters such as hydraulic cylinder size, hydraulic accumulator capacity and pre-charge pressure and hydraulic motor displacement. Conventionally, the optimal parameters of the HPTO unit need to be manually estimated by repeating setting the parameters’ values during the simulation process. However, such an estimation method can easily be exposed to human error and would subsequently result in an inaccurate selection of HPTO parameters for WECs. Therefore, an effective approach of using the non-evolutionary Non-Linear Programming by Quadratic Lagrangian (NLPQL) and evolutionary Genetic Algorithm (GA) algorithms for determining the optimal HPTO parameters was explored in the present study. A simulation–optimisation of the HPTO model was performed in the MATLAB/Simulink environment. A complete WECs model was built using Simscape Fluids toolbox in MATLAB/Simulink. The actual specifications of hydraulic components from the manufacturer were used during the simulation study. The simulation results showed that the performance of optimal HPTO units optimised by NLPQL and GA approaches have significantly improved up to 96% and 97%, respectively, in regular wave conditions. The results also showed that both optimal HPTO units were capable of generating electricity up to 62% and 77%, respectively, of their rated capacity in irregular wave circumstances.

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Section: Hydrodynamic Motion Of the Floatermentioning

confidence: 99%

An Estimation of Hydraulic Power Take-off Unit Parameters for Wave Energy Converter Device Using Non-Evolutionary NLPQL and Evolutionary GA Approaches

et al. 2020

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“…Wave activated body is the concept where the movement of the wave is translated to the movement of the device (Kim et al 2019). A noteworthy subcategory of wave activated bodies are point absorbers (Do et al 2018;Tampier & Grueter 2017). The main advantage of point absorbers is that they are relatively small in the size and require less space on the ocean surface area.…”

Section: Literature Reviewmentioning

confidence: 99%

Small Scale Low Height Wave Energy Seawater Pump for Achieving Environmental and Economic Sustainability

Lee¹,

Feng²,

Lee³

2020

ujme

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This study is about the design and development of seawater pump powered by low height sea wave at near shore region. This study focuses on developing seawater pump that does not use any electricity for delivering high pressure saline water to on shore region which is in line with the global renewable energy quest. Malaysia is blessed with the geographic location of surrounded by sea which enables this technology to be utilized. The challenge in utilizing such technology is due to the nature of the sea wave surrounding Malaysia that is classified as low height sea wave which increase the difficulty in utilizing such technology in neither electricity generation nor sea water delivery. On top of that, there is limited study available in this area especially low wave height. The prototype is designed based on point absorber concept with piston type pump configuration for water delivery. Then the prototype is tested at the Mukah Beach with average recorded wave height of less than 1m. Findings demonstrated that a single prototype pump is capable of delivering maximum pressure head of 10m with maximum flow of 1.2Litre per minute (LPM). For three pumps connected in series, the maximum pressure head can reach up to 25m pressure head with maximum flow rate of 1.5LPM. Similarly, when connected in parallel, the system is capable to deliver up to 14m of pressure head and 3LPM of flow rate. The findings indicate that the prototype is significant for seawater delivering. Although the output of the prototype is small, its potential is yet to be fully unleashed. Therefore, it is highly recommended for future study the prototype to be pair together with more similar pumps in series or parallel configurations to form a system of pumps to create higher flow and higher head for more application. This study concludes that the designed and developed prototype is useful for delivering saline water for various application such as seawater desalination or electricity generation in near shore area or islands.

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“…The check valves CV5 and CV6 are used to ensure the fluid never flows to the booster pump and oil-tank during normal pressure limits. This hydraulic PTO concept has been applied in several studies described in [59,[78][79][80][81][82].…”

Section: Constant-pressure Hydraulic Pto Based On Four-check Valves Cmentioning

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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A multi-point-absorber wave-energy converter for the stabilization of output power

Cited by 36 publications

References 20 publications

An Estimation of Hydraulic Power Take-off Unit Parameters for Wave Energy Converter Device Using Non-Evolutionary NLPQL and Evolutionary GA Approaches

An Estimation of Hydraulic Power Take-off Unit Parameters for Wave Energy Converter Device Using Non-Evolutionary NLPQL and Evolutionary GA Approaches

Small Scale Low Height Wave Energy Seawater Pump for Achieving Environmental and Economic Sustainability

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

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