Analysis, design and testing of a novel direct‐drive wave energy converter system

Crozier, Richard; Bailey, Helen; Mueller, Markus; Spooner, E.D.; McKeever, Paul

doi:10.1049/iet-rpg.2012.0072

Cited by 18 publications

(11 citation statements)

References 15 publications

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“…[111] describes different available concepts, such as the linear permanent magnet synchronous machine, the linear air-cored permanent magnet synchronous machine, the slot-less tubular permanent magnet synchronous machine or the Snapper concept, which has been specifically developed for wave energy conversion purposes under the seventh framework programme funded by the European Community [112]. [113,114] describe different forces, some of which can lead to nonlinear behaviour, that are involved in the operation within the machine: the interaction of the two sets of magnets, electromagnetic damping due to the current carrying coils and other forces due to different losses such as eddy currents in armature and translator, saturation and reactive field losses, and losses due to proximity effects.…”

Section: Direct Drivementioning

confidence: 99%

Mathematical modelling of wave energy converters: A review of nonlinear approaches

Peñalba

Giorgi

Ringwood

2017

Renewable and Sustainable Energy Reviews

187

123

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The wave energy sector has made and is still doing a great effort in order to open up a niche in the energy market, working on several and diverse concepts and making advances in all aspects towards more efficient technologies. However, economic viability has not been achieved yet, for which maximisation of power production over the full range of sea conditions is crucial. Precise mathematical models are essential to accurately reproduce the behaviour, including nonlinear dynamics, and understand the performance of wave energy converters. Therefore, nonlinear models must be considered, which are required for power absorption assessment, simulation of devices motion and model-based control systems. Main sources of nonlinear dynamics within the entire chain of a wave energy converter-incoming wave trains, wave-structure interaction, power takeoff systems or mooring lines-are identified, with especial attention to the wave-device hydrodynamic interaction, and their influence is studied in the present paper for different types of converters. In addition, different approaches to model nonlinear wave-device interaction are presented, highlighting their advantages and drawbacks. Besides the traditional Navier-Stokes equations or potential flow methods, 'new' methods such as system-identification models, smoothed particle hydrodynamics or nonlinear potential flow methods are analysed.

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Section: Direct Drivementioning

confidence: 99%

Mathematical modelling of wave energy converters: A review of nonlinear approaches

Peñalba

Giorgi

Ringwood

2017

Renewable and Sustainable Energy Reviews

187

123

View full text Add to dashboard Cite

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“…The generator damping coefficient c p was measured for different load cases and was concluded that it remains constant for the full stator overlap, and linearly decrease when the overlap decrease. Crozier, et al [102] presented a novel linear generator installed at the sea bed and linked to a heaving buoy using a snapper system.…”

Section: Linear Generatorsmentioning

confidence: 99%

Point Absorber Wave Energy Harvesters: A Review of Recent Developments

2018

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Even though ocean waves around the world are known to contain high and dense amounts of energy, wave energy harvesters are still not as mature as other forms of renewable energy harvesting devices, especially when it comes to commercialization, mass production, and grid integration, but with the recent studies and optimizations, the point absorber wave energy harvester might be a potential candidate to stand out as the best solution to harvest energy from highly energetic locations around the world’s oceans. This paper presents an extensive literature review on point absorber wave energy harvesters and covers their recent theoretical and experimental development. The paper focuses on three main parts: One-body point absorbers, two-body point absorbers, and power take-offs. This review showcases the high amount of work being done to push point absorbers towards technological maturity to eventually kick off commercialization and mass production. It should also provide a good background on the recent status of point absorber development for researchers in the field.

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“…The Snapper is an ingenious electrical generator specifically created for wave energy conversion, that combines the magnetic gearing concept with a linear electric generator [129,133]. The objective of the Snapper PTO is to increase the relative velocity between the armature and the translator by using magnetic coupling and springs.…”

Section: Snappermentioning

confidence: 99%

A Review of Wave-to-Wire Models for Wave Energy Converters

2016

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Control of wave energy converters (WECs) has been very often limited to hydrodynamic control to absorb the maximum energy possible from ocean waves. This generally ignores or significantly simplifies the performance of real power take-off (PTO) systems. However, including all the required dynamics and constraints in the control problem may considerably vary the control strategy and the power output. Therefore, this paper considers the incorporation into the model of all the conversion stages from ocean waves to the electricity network, referred to as wave-to-wire (W2W) models, and identifies the necessary components and their dynamics and constraints, including grid constraints. In addition, the paper identifies different control inputs for the different components of the PTO system and how these inputs are articulated to the dynamics of the system. Examples of pneumatic, hydraulic, mechanical or magnetic transmission systems driving a rotary electrical generator, and linear electric generators are provided.

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Analysis, design and testing of a novel direct‐drive wave energy converter system

Cited by 18 publications

References 15 publications

Mathematical modelling of wave energy converters: A review of nonlinear approaches

Mathematical modelling of wave energy converters: A review of nonlinear approaches

Point Absorber Wave Energy Harvesters: A Review of Recent Developments

A Review of Wave-to-Wire Models for Wave Energy Converters

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