The maximum wave energy conversion by two interconnected floaters: Effects of structural flexibility

Zhang, Xiantao; Lü, Dagang; Guo, Fu; Gao, Yun; Sun, Yonggang

doi:10.1016/j.apor.2017.12.003

Cited by 34 publications

(12 citation statements)

References 16 publications

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“…Moreover, the devices are driven either by an absolute motion of the floating buoy with respect to an external fixed reference or by the relative movement of the two or more floating bodies [33,34]. Zhang, et al [35] studied a power conversion device with two interconnected floaters horizontally, the electricity is generated through the relative pitch motion of two floaters as a power take-off (PTO) system.…”

Section: Buoy Structuresmentioning

confidence: 99%

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

Z¹,

Zhang²,

Xiao³

et al. 2019

Preprint

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Ocean wave energy conversion as one of the renewable clean energy sources is attracting the research interests of many people. This review introduces different types of power take-off technology of wave energy converters. The main focus is the linear direct drive power take-off devices as they have the advantages for ocean wave energy conversion. The designs and optimizations of power take-off systems of ocean wave energy converters have been studied from reviewing the recently published literature. Also, the simple hydrodynamics of wave energy converters have been reviewed for design optimization of the wave energy converters at specific wave sites. The novel mechanical designs of the power take-off systems have been compared and investigated in order to increase the energy harvesting efficiency.

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Section: Buoy Structuresmentioning

confidence: 99%

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

Z¹,

Zhang²,

Xiao³

et al. 2019

Preprint

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“…It is assumed that there are N floating bodies in array condition. All floating bodies can only move in the heaving motion ( (7) and (10), the other degrees of freedom ideally restricting. Denoting the mass matrix and heaving acceleration of the n-th body with M n andZ n , and using (7) and (10) for the radiation and diffraction forces on the n-th body, the dynamic equation which describes the n-th floating body motion with a single degree of freedom in the time domain, oscillating in heave is:…”

Section: Hydrodynamic Model Of Multiple Floating Bodiesmentioning

confidence: 99%

“…A hinged multi-module converter is made up of connected sections which flex and bend as waves pass, this motion is used to generate electricity. The effect of structural flexibility on the maximum wave energy conversion by two interconnected floaters is investigated [7]. A point absorber is a device that heave up and down on the surface of the water.…”

Section: Introductionmentioning

confidence: 99%

A Study on Electrical Power for Multiple Linear Wave Energy Converter Considering the Interaction Effect

Murai

Kuwada

2018

Energies

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A linear electrical generator can be used on wave energy converter for converting the kinetic energy of a floating structure to the electricity. A wave farm consists of multiple wave energy converters which equipped in a sea area. In the present paper, a numerical model is proposed considering not only the interference effect in the multiple floating structures, but also the controlling force of each linear electrical generator. In particular, the copper losses in the electrical generator is taken into account, when the electrical power is computed. In a case study, the heaving motions and electrical powers of the multiple wave energy converters are estimated in the straight arrangement and triangle arrangement. In addition, the average electrical power is analyzed in different distances of the floating structures. The aim of this paper is to clear the relationship between the interference effect and electric powers from wave energy converters. This will be useful for deciding the arrangement of multiple wave energy converters.

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“…Its development is now abandoned for reasons that cannot be ascribed to the validity of the patented concept. Recently, a hinged-two-module WEC was studied in [15,16]. The DEXA has been studied by the authors through similar (although different) physical model studies with the purpose of optimizing its design for installation in arrays ( [6]) and of improving its performance and the possible beneficial effects in terms of coastal protection ( [14,17]).…”

Section: Introductionmentioning

confidence: 99%

Effects of Mooring Compliancy on the Mooring Forces, Power Production, and Dynamics of a Floating Wave Activated Body Energy Converter

Martinelli

Zanuttigh

2018

Energies

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The paper aims at investigating the interactions between a floating wave energy device (WEC) and its mooring system under a variety of wave conditions (regular and irregular, perpendicular and oblique, ordinary and extreme). The analyzed WEC is the DEXA, a wave activated body point absorber, of the type that performs better when aligned to the incident wave direction. Two typologies of mooring systems were studied: for limited depths, the spread system, with a disposition of the lines that do not constrain the yaw movements; for large depths, the catenary anchor leg mooring (CALM) system. The spread system was experimentally investigated, including a realistic power take-off system, to capture non-linear behaviors and assess device motions, power production, and forces on mooring lines. The CALM system was numerically simulated, as mooring modelling is more reliable in deep waters and allows testing of a number of different configurations, by changing the number of the mooring lines and the mooring layout. The experiments showed that a reduction of the mooring compliancy increases the power production. The numerical simulations showed that a redundancy on the number of chains allows a better distribution of the loads, with advantages on reliability and costs.

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The maximum wave energy conversion by two interconnected floaters: Effects of structural flexibility

Cited by 34 publications

References 16 publications

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

A Study on Electrical Power for Multiple Linear Wave Energy Converter Considering the Interaction Effect

Effects of Mooring Compliancy on the Mooring Forces, Power Production, and Dynamics of a Floating Wave Activated Body Energy Converter

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