Modelling and preliminary studies for a self-reacting point absorber WEC

Olaya, Sébastien; Bourgeot, Jean-Matthieu; Benbouzid, Mohamed

doi:10.1109/icge.2014.6835390

Cited by 7 publications

(7 citation statements)

References 14 publications

(21 reference statements)

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“…6 shows the global wave power distribution in kW per metre of crest length. It is possible to generate electricity through these means by using a wave energy convertor [56,57]. Research conducted for the International Panel on Climate Change suggested that the entire theoretical wave energy potential was 32PWh per annum [44,58].…”

Section: Wave Energymentioning

confidence: 99%

Overview of ocean power technology

Wilberforce

Hassan

Durrant

et al. 2019

Energy

129

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This work discusses and provides a critical expose of some of the newly emerging renewable energy technologies with special concentration on marine energy generation. The work shows that there are several promising new developments in harvesting marine energy and it examines some of these technologies and discusses their advantages and some of the obstacles that are impeding the commercialisation of these emerging technologies. This includes wave energy harvesting, tidal energy harvesting, ocean thermal energy and the utilisation of salinity gradients for electricity generation. The work emphasises the fact that these new emerging technologies are currently at the developing stages and has a long way to go before successful commercialisation and wide adoption become the norm. The work stresses the need for more research and developmental work to address several of the technical issues that need to be addressed including devices designs, their installation and maintenance, the infrastructure which includes the grid and power transmission as well as losses, their use in arrays, and their longevity. This work underlines the lack of reliable studies on the long term impacts of these technologies on both the marine environment and nearby habitations and highlights the need for proper environmental and social impact assessments of these technologies.

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Section: Wave Energymentioning

confidence: 99%

Overview of ocean power technology

Wilberforce

Hassan

Durrant

et al. 2019

Energy

129

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“…This structure is made up of a vertical cylinder, referenced in the following as spar, with a damping plate attached at its keel. Energy resulting from the relative motion between the two concentric bodies is harnessed by rack-and-pinion, which drives a permanent magnet synchronous generator through a gearbox [16]. Figure 8 summarizes the different conversion stages.…”

Section: Iii2 Wec Main Projectsmentioning

confidence: 99%

“…These investigations have led to the conclusion that the transverse flux permanent magnet generator is a good candidate in terms of higher power density and efficiency. The use of permanent magnet synchronous generator is an intermediate option [16], [28]. The use of induction generators implies a specific mechanical PTO that induces additional losses affecting the WEC overall efficiency [29][30][31][32].…”

Section: Offshorementioning

confidence: 99%

An Up-to-Date Technologies Review and Evaluation of Wave Energy Converters

Titah-Benbouzid¹,

Benbouzid²

2015

IREE

Self Cite

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The potential of electric power generation from marine renewable energy is enormous. Ocean waves are being recognized as a resource to be exploited for the sustainable generation of electrical power. The high load factors resulting from the fluid properties and the predictable resource characteristics make ocean waves particularly attractive for power generation and advantageous when compared to other renewable energies. Regarding this emerging and promising area of research, this paper presents a complete review of wave energy technologies describing, analyzing and fixing many of the concepts behind wave energy conversion. The proposed review will specifically highlights the main wave energy conversion projects around the world at different levels (demonstration stage, in production, and commercialized projects). In particular, mooring will be discussed, as it is a key feature behind massive deployment of wave energy converters. Finally, a discussion will highlight challenges that wave energy converters need to overcome to become commercially competitive in the global energy market.

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“…In order to enhance the spar modelling during the resonant oscillation we use, as a first approximation, a constant linear damping term b drag , proportional to the spar velocity such as f drag = −b dragż2 . In this paper the additional damping is chosen in such a way that it corresponds to the maximum dissipation of the non-linear term [8] when optimal active control is applied 3 which corresponds approximatively, after numerical investigation, to 14.5% of the critical damping defined as b crit,2 = 2 (m 2 + m a,22 (∞))κ 2 . Finally, f gen denotes the force due to the generator which is also the control input.…”

Section: The Self-reacting Point Absorber Model a Mathematical Bmentioning

confidence: 99%

“…and assumingf gen = Z gen (ẑ 1 −ẑ 2 ), without loss of generality, and Z c = Z 12 = Z 21 , we may rewrite (8) as …”

Section: Phenomenologically One-body Equivalent Modelmentioning

confidence: 99%

Optimal control for a self-reacting point absorber: A one-body equivalent model approach

Olaya

Bourgeot

Benbouzid

2014

2014 International Power Electronics and Application Conference and Exposition

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International audienceThis paper deals with the optimal control of a self-reacting Wave Energy Converter (WEC) where the reaction force is obtained using a damping-plate. Model Predictive Control (MPC) is applied for unconstrained and constrained input control cases. Objective function attempting to optimise the power generation is directly formulated as an absorbed power maximisation problem and thus no optimal references, such as buoy and/or spar velocity, is required. Moreover, rather than using the full WEC model in the optimisation problem which can be time-consuming, and because of linear assumptions, we propose the use of a phenomenologically one-body equivalent model derived using the Thévenin 's theorem. Index Terms—wave energy converter, phenomenologically one-body equivalent model, optimal control, model predictive control

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Modelling and preliminary studies for a self-reacting point absorber WEC

Cited by 7 publications

References 14 publications

Overview of ocean power technology

Overview of ocean power technology

An Up-to-Date Technologies Review and Evaluation of Wave Energy Converters

Optimal control for a self-reacting point absorber: A one-body equivalent model approach

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