Performance of arrays of direct-driven wave energy converters under optimal power take-off damping

Wang, Liguo; Engström, Jens; Leijon, Mats; Isberg, Jan

doi:10.1063/1.4961498

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…Meanwhile, the diffraction force is found to be highest at 10 m distance. The consideration of this distance might be underestimated due to the destructive effect of the incoming wave that compensate each other, particularly leads to a smaller impact of the wave interactions on the absorbed energy [17].…”

Section: Resultsmentioning

confidence: 99%

Ocean Wave-Structure Interaction of Two Wave Energy Converters in Malaysian Water

Adha

Kurian³

et al. 2018

MATEC Web Conf.

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Due to rapid urbanization and industrialization, the consumption of electricity in the world is expected to increase, thus leads to the fast development of the renewable energy industry. In 2016, 24.5% of the electricity is produced by renewable energy. There are several types of renewable energy, e.g. solar, wind, and ocean wave. The ocean wave energy is identified to have the greatest potential for electricity generation. There are various types of wave energy converter (WEC) that have been designed for harnessing the wave energy, e.g. the oscillating water column, salter duck, point absorber, water dagon etc. Due to the smaller dimension, the point absorber is the most suitable WEC to be deployed in an array configuration, whereby each isolated WEC interacts and alters the vicinity of the wave formation by absorbing, radiating, and diffracting the wave. Subsequently, the wave interference will also affect the WEC’s performance. The objective of the present study is to investigate the optimum separation distance, d, that would resulting to an optimum performance between two WECs in an array configuration using a computational fluid dynamics (CFD) software. The analysis considered an isolated WEC and two WECs, i.e. the heaving point absorbers with three point catenary mooring lines. The influence of the separation distance towards diffraction and response amplitude operator (RAO) of an array of two WECs was evaluated. The optimum production of the wave energy by the heaving point absorber is observed to be highly dependant on the relative heave motion of the two WECs [1]. In the present study, it shows that the optimum distance between two WECs in an array configuration is 20 m, whereby the maximum heave RAO were identified.

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Section: Resultsmentioning

confidence: 99%

Ocean Wave-Structure Interaction of Two Wave Energy Converters in Malaysian Water

Adha

Kurian³

et al. 2018

MATEC Web Conf.

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“…An iterative quasi-Newton optimisation algorithm was applied by [846] to identify the maximum captured power of an array of Duck WECs under motion constraints. Similarly, [812,813] optimised individual dampings for an array of point-absorbing WECs constrained to heave motion, see Figure 9.6. The efficiency of the model predictive control approach to wave farm optimisation was demonstrated by [441], where increases in power of up to 20% were obtained.…”

Section: Non-linear Optimisation and Coordinated Controlmentioning

confidence: 99%

Modelling and Optimisation of Wave Energy Converters

Ning¹,

Ding²

2022

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“…The hydrodynamic interactions among WECs can be evaluated by the interaction factor q, which is defined as the ratio of the total power generation of the WEC array to that of the same number of isolated WECs [12]; q > 1 means that the interactions are constructive, while q < 1 means that the interactions are destructive. Investigations on how the interaction factor q is influenced by various parameters have become the focus of many studies, such as buoy size [23,24], power take-off (PTO) characteristics [25,26], number of buoys [27], inter-buoy spacing [28], and array layout [29][30][31][32][33]. In addition, some researchers have made efforts on how to reduce costs, such as integrating WECs with other offshore structures [34,35].…”

Section: Introductionmentioning

confidence: 99%

A Novel Type of Wave Energy Converter with Five Degrees of Freedom and Preliminary Investigations on Power-Generating Capacity

et al. 2022

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In order to further improve the power-generating capacity of the wave energy converter (WEC) of oscillating buoy type, this paper puts forward a novel type where the WEC can move and extract power in five degrees of freedom. We make a detailed hydrodynamic analysis of such WECs. Each buoy is modeled as a floating truncated cylinder with five degrees of freedom: surge, sway, heave, roll, and pitch, and there are relative motions among buoys in the array. Linear power take-off (PTO) characteristics are considered for simplicity. Under the linear wave theory, a semi-analytical method based on the eigenfunction expansion and Graf’s addition theorem for Bessel functions is proposed to analyze the hydrodynamic interactions among the WEC array under the action of incident waves, and the amplitude response and power extraction of the WEC array are then solved. After verifying the accuracy of hydrodynamic analysis and calculation, we make preliminary case studies, successively investigating the power-generating capacity of a single WEC, an array of two WECs, and an array of five WEC; then, we compare their results with the conventional heaving WECs. The results show that the WEC with five degrees of freedom can significantly improve the power extraction performance.

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Performance of arrays of direct-driven wave energy converters under optimal power take-off damping

Cited by 6 publications

References 28 publications

Ocean Wave-Structure Interaction of Two Wave Energy Converters in Malaysian Water

Ocean Wave-Structure Interaction of Two Wave Energy Converters in Malaysian Water

Modelling and Optimisation of Wave Energy Converters

A Novel Type of Wave Energy Converter with Five Degrees of Freedom and Preliminary Investigations on Power-Generating Capacity

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