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Dissertations / Theses on the topic 'Wave Energy Convertor'

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Published: 4 June 2021
Last updated: 16 February 2022

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1

Gotthardsson, Björn. "Analysis and Evaluation of the Wavebox Wave Energy Converter." Thesis, Uppsala universitet, Elektricitetslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-149364.

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Increasing attention to climate change in combination with ever-growing energy consumption worldwide has boosted the demand for new green energy sources. Wave power is developing in many different branches to become part of the new era of electricity production. This thesis deals with a wave power system in its primary stages of development. The system was investigated in order to estimate its potential to produce electric power from sea waves. It is a system consisting of a moored buoy to which the energy is transferred when the wave tilts the buoy in the pitch direction. Due to the increased
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Waters, Rafael. "Energy from Ocean Waves : Full Scale Experimental Verification of a Wave Energy Converter." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9404.

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A wave energy converter has been constructed and its function and operational characteristics have been thoroughly investigated and published. The wave energy converter was installed in March of 2006 approximately two kilometers off the Swedish west coast in the proximity of the town Lysekil. Since then the converter has been submerged at the research site for over two and a half years and in operation during three time periods for a total of 12 months, the latest being during five months of 2008. Throughout this time the generated electricity has been transmitted to shore and operational data
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O'Boyle, Louise. "Wave fields around wave energy converter arrays." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602715.

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Wave energy converters, by their nature, extract large amounts of energy from incident waves. If the industry is to progress such that wave energy becomes a significant provider of power in the future, large wave farms will be required. Presently, consenting for these sites is a long and problematic process, mainly due to a lack of knowledge of the potential environmental impacts. Accurate numerical modelling of the effect of wave energy extraction on the wave field and subsequent evaluation of changes to coastal processes is therefore required. Modelling the wave field impact is also necessar
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Du, Plessis Jacques. "A hydraulic wave energy converter." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/19950.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: As a renewable energy source, wave energy has the potential to contribute to the increasing global demand for power. In South Africa specifically, the country’s energy needs may easily be satisfied by the abundance of wave energy at the South-West coast of the country. Commercially developing and utilizing wave energy devices is not without its challenges, however. The ability of these devices to survive extreme weather conditions and the need to achieve cost-efficacy while achieving high capacity factors are but some o
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Salar, Dana. "Miniature Wave Energy Converter (WEC)." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-366760.

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Abstract     In this project, I present a design of a scale model of a linear generator (LG) similar to a full size Wave Energy Converter (WEC) being developed at Uppsala University since 2002 and commercialized by Seabased AB. The purpose of a WEC is to convert the energy from ocean waves into electrical energy. In order to implement the behaviour of the prototype design, a preliminary study has been done to further build it for use in education, laboratory tests and research. The challenge with this project is to scale down the WEC but maintain the shape, appearance and characteristics of th
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Rahm, Magnus. "Ocean Wave Energy : Underwater Substation System for Wave Energy Converters." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-112915.

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This thesis deals with a system for operation of directly driven offshore wave energy converters. The work that has been carried out includes laboratory testing of a permanent magnet linear generator, wave energy converter mechanical design and offshore testing, and finally design, implementation, and offshore testing of an underwater collector substation. Long-term testing of a single point absorber, which was installed in March 2006, has been performed in real ocean waves in linear and in non-linear damping mode. The two different damping modes were realized by, first, a resistive load, and
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Feng, Zhe. "Control of wave energy converters." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/27048.

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In this thesis, two types of control problems related to wave energy converters are studied. The first type of control problem is active force control. We propose a simple optimal control problem formulation for which, in theory, there is no convexity guarantee. However, we demonstrate that the discretized large-scale nonlinear programming (NLP) problem can be convex and that the convexity is related only to the system parameters and is independent from the excitation force and current state. This important feature implies that we are always able to choose a set of system parameters off-line s
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8

ESPING, JONATAN. "Bearings in Wave Energy Converters." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299281.

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Wave energy and wave energy converters is a fast rapidly developing field of research and energy harvesting. In recent years, more and more designs have seen operational success, and more and more are in development. Wave energy converters face a challenge not properly explored until recently, high loaded, oscillating motion in a highly hostile environment. Which poses a multitude of challenges ranging from contact fatigue to corrosion wear. However, this field is still in early development, seeing little to no research published about it. This work intends to inform about the challenges these
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9

McNatt, James Cameron. "Cylindrical linear water waves and their application to the wave-body problem." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/20378.

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The interaction between water waves and a floating or fixed body is bi-directional: wave forces act on and cause motion in the body, and the body alters the wave field. The impact of the body on its wave field is important to understand because: 1) it may have positive or negative consequences on the natural or built environment; 2) multiple bodies in proximity interact via the waves that are scattered and radiated by them; and 3) in ocean wave energy conversion, by conservation of energy, as a device absorbs energy, so too must the energy be removed from the wave field. Herein, the cylindrica
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10

Ransley, Edward Jack. "Survivability of wave energy converter and mooring coupled system using CFD." Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3503.

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This thesis discusses the development of a Numerical Wave Tank (NWT) capable of describing the coupled behaviour of Wave Energy Converters (WECs) and their moorings under extreme wave loading. The NWT utilises the open-source Computational Fluid Dynamics (CFD) software OpenFOAM(R) to solve the fully nonlinear, incompressible, Reynolds-Averaged Navier-Stokes (RANS) equations for air and water using the Finite Volume Method (FVM) and a Volume of Fluid (VOF) treatment of the interface. A method for numerically generating extreme waves is devised, based on the dispersively-focused NewWave theory a
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11

Price, Alexandra A. E. "New perspectives on wave energy converter control." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3109.

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This work examines some of the fundamental problems behind the control of wave energy converters (WECs). Several new perspectives are presented to aid the understanding of the problem and the interpretation of the literature. The first of these is a group of methods for classifying control of WECs. One way to classify control is to consider the stage of power transfer from the wave to the final energy carrier. Consideration of power transfer can also be used to classify WECs into families. This approach makes it possible to classify all WECs, including those that had previously eluded classifi
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12

Jansson, Elisabet. "Multi-buoy Wave Energy Converter : Electrical Power Smoothening from Array Configuration." Thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-293689.

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This master thesis is done within the Energy Systems Engineering program at Uppsala University and performed for CorPower Ocean. Wave energy converters (WECs) are devices that utilize ocean waves for generation of electricity. The WEC developed by CorPower Ocean is small and intended to be deployed in an array. Placed in an array the different WECs will interact hydrodynamically and the combined power output is altered. The aim of this thesis is to model and investigate how the array configuration affects the electric power output. The goal is to target an optimal array layout for CorPower Oce
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Noad, Imogen Frances. "Absorbing power from ocean waves : a mathematical approach to modelling wave energy converters." Thesis, University of Bristol, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.752773.

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Katsidoniotaki, Eirini. "Extreme wave conditions and the impact on wave energy converters." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-441043.

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The amount of energy enclosed in ocean waves has been classified as one of the most promising renewable energy sources. Nowadays, different wave energy conversion (WEC) systems are being investigated, but only a few concepts have been operated in a sea environment. One of the largest challenges is to guarantee the offshore survivability of the devices in extreme wave conditions. However, there are large uncertainties related to the prediction of extreme wave loads on WECs.  Highfidelity computational fluid dynamics (CFD) simulations can resolve nonlinear hydrodynamic effects associated with wa
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De, Marichalar Alegre Alexandra. "Overtopping Converter Prototype for Electrical Generation from Wave Energy : Laboratory Test." Thesis, KTH, Energiteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-38883.

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It is not a coincidence that over half the world‟s population live in coastal areas using the sea as a mean to develop its industry, thus the sea is present in most aspects of daily life. Because of the vital relationship with the marine environment, for many years mankind is aware of the high energy potential contained in waves. During the last hundred years, thousands patents of devices for the extraction of the energy from waves have been published. However, the researching still faces the challenge of develop the optimal wave energy converter that matches robustness, to withstand extreme m
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Engström, Jens. "Hydrodynamic Modelling for a Point Absorbing Wave Energy Converter." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160319.

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Surface gravity waves in the world’s oceans contain a renewable source of free power on the order of terawatts that has to this date not been commercially utilized. The division of Electricity at Uppsala University is developing a technology to harvest this energy. The technology is a point absorber type wave energy converter based on a direct-driven linear generator placed on the sea bed connected via a line to a buoy on the surface. The work in this thesis is focused mainly on the energy transport of ocean waves and on increasing the transfer of energy from the waves to the generator and loa
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Gastelum, Zepeda Leonardo. "Life Cycle Assessment of a Wave Energy Converter." Thesis, KTH, Industriell ekologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-206486.

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Renewable energies had accomplish to become part of a new era in the energy development area, making people able to stop relying on fossil fuels. Nevertheless the environmental impacts of these new energy sources also require to be quantified in order to review how many benefits these new technologies have for the environment. In this project the use of a Life Cycle Assessment (LCA) will be implemented in order to quantify the environmental impact of wave energy, an LCA is a technique for assessing various aspects with the development of a product and its potential impact throughout a product’
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Ljungbäck, Jacob. "Characterization of Cascade gearbox for wave energy converter." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182811.

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This Master Thesis, written in collaboration with CorPower Ocean, serves as the finalization of the author’s master degree education at KTH (Royal Institute of Technology) Stockholm. The purpose has been to characterize the Cascade gearbox which is used to convert vertical motion induced by waves to rotational motion which powers generators in the company’s future wave energy power plant. The purpose was also to suggest future improvements and shed light on any problems discovered. The method for characterizing the Cascade gearbox was to conduct physical measurements of the load sharing in the
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Wilkinson, Laurie Fletcher. "Assessment of a nearshore modular flap-type wave energy converter." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31163.

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This thesis presents an assessment of a modular flap-type wave energy converter. Comparisons are made to an equivalent width rigid device. All quoted relative difference results here use the rigid device as the reference point. The variables that are evaluated are the power capture and surge and yaw foundation loads. The power capture is evaluated at both module and device level, while the foundation loads are assessed just at the device level. The investigation is carried out through testing of a 30th scale physical model in a wave tank. A key output from the work is the development of the ph
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Hals, Jørgen. "Modelling and phase controlof wave-energy converters." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11952.

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Current prognoses are that, unless counteracted by very strong political measures, the world will meet both energy shortage and climate crisis within a horizon of a few decades, both of which are strongly related to our dependence on fossil fuels. Renewable energy sources may be harvested sustainably, and developing technology for their exploitation therefore forms an obvious part of strategies to reduce emissions and secure energy supply. Wave energy is a resource with relatively high power density, readily available along the coasts, and thus coinciding with the areas where industry and peop
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Hoen, Marthe Kristine Tautra. "Modeling and Control of Wave Energy Converters." Thesis, Norwegian University of Science and Technology, Department of Engineering Cybernetics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8960.

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<p>Wave Power is a technology that was founded in the 70's, but which still not has reached full industrial recognition as a energy source. In this thesis there is a literature study on different concepts of Wave Energy Converters(WEC) which has been build in full scale, and there is a great variety in the concepts. There is a theory chapter where ocean waves theory, mass-spring-damper dynamics, hydrodynamics and maximum power capture are presented. The modeling work was done on a axisymmetric point absorber WEC, which can be said to have the greatest potential for energy absorption because
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Thies, Philipp Rudolf. "Advancing reliability information for Wave Energy Converters." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/4053.

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Marine renewable energy promises to provide a significant contribution to the future electricity supply. It is estimated that 17% of today's UK electricity demand could be generated from wave and tidal sources. The ambition to harvest this resource is in the public interest, as it eases the pressures on energy security, holds the potential to reduce carbon emissions and has the prospect to create a new UK industry sector worth £15 billion. From an engineering perspective, marine energy is one of the least developed renewable energy technologies and has to be regarded as unproven. The reliabili
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Thomas, Simon. "Control of Wave Energy Converters in arrays." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-364096.

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One way to lower the levelized cost of energy for wave power plants and paving so the way for commercial success, is to increase the power absorption by use of advanced control algorithms. This thesis investigates the influence of the generator inertia, the generator damping and the layout on power absorption and presents a new model free strategy of controlling wave energy converters. The evaluation of all control strategies was done in a numerical simulation and in experimental 1:10 model scale wave tank tests conducted in the COAST laboratory at the University of Plymouth. The WECs used are
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Gustafsson, Egil. "Extreme loading and fatigue analysis of a wave energy device." Thesis, KTH, Marina system, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198506.

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Wave energy is one of the possible solutions for meeting the future energy demand in a clean and sustainable way. Extracting large amounts of energy, a wave energy device would be subjected to extreme and fatigue loads from the waves. Designing such a device, a trade off needs to be done between making a device that is strong enough to withstand the loads and on the same time not too heavy making it inefficient and too costly. Having good estimations of extreme and fatigue loads are therefore critical when designing an efficient wave energy device. This thesis has aimed to create a tool that c
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Weller, Samuel David. "Wave energy extraction from device arrays : experimental investigation in a large wave facility." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/wave-energy-extraction-from-device-arrays-experimental-investigation-in-a-large-wave-facility(5e43e3e5-4776-42c1-9d4e-22160de8abbe).html.

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Multiple wave energy devices supported by a common structure represent one possible method of efficiently converting ocean wave energy into electricity. In this study, experimental measurements of multiple small-scale wave energy devices are reported to assist the development and validation of numerical models. Through observation and measurement, the response of two float geometries subjected to a range of wave conditions and device settings were determined. A range of regular wave conditions were identified that caused a linear relationship to occur between the heave displacement amplitude o
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Leijon, Jennifer. "Simulation of a linear wave energy converter with different damping control strategies for improved wave energy extraction." Thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-287369.

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In this project, the wave energy converter (WEC) designed at Seabased AB and Uppsala University was modelled in the program MATLAB. In order to increase the average output power, the WEC should be controlled. Therefore, the simulation tool was used to investigate damping strategies where the damping coefficient was changed at different times of the wave period. The tests showed that a suitable damping strategy, matched to the sea state at the specific location of the site and the overall WEC design, increases the average output power, as well as may protect the WEC from damages. This can lead
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Magagna, Davide. "Oscillating water column wave pump : a wave energy converter for water delivery." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/349009/.

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The research presented in this dissertation investigates the development and the performances of a new type of Wave Energy Converter (WEC) aimed to provide water delivery and energy storage in the form of potential energy. The Oscillating Water Column Wave Pump (OWCP) concept was proposed and tested through a series of experimental investigations supported by scientific theory. The OWCP was developed after an extensive study of the existing wave energy technology available, from which it emerged that the Oscillating Water Column (OWC) device could be further implemented for water delivery purp
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Lok, Kane Sing. "Optimisation of the output of a heaving wave energy converter." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/optimisation-of-the-output-of-a-heaving-wave-energy-converter(83a94b70-d75b-4149-98c4-5a120388d583).html.

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This research project is to investigate the control of the wave power device, known as the 'Manchester Bobber' (MB), and to optimise the output by tuning its drive-train parameters. The work starts with building a numerical model and developing a control strategy. The work sequentially progressed to obtain the experimental results from a physical model in order to make a comparison with the numerical results.An assessment of three different control strategies is made. These are reactive control, latching control, and two methods of torque control based on either time-averaged velocity or a pre
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Joubert, James Rattray. "Design and development of a novel wave energy converter." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85817.

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Thesis (PhD)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: The design, development and evaluation of a novel wave energy converter (WEC) device, called the ShoreSWEC, in a South African port development is presented. Based on the device requirements, site selection criteria were specified and applied to identify a suitable deployment location. A wave modeling procedure was developed to determine the operational wave conditions and available wave power resource at the selected location. The site was found to have a low mean annual average resource of approximately 2.3 kilowatt per
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Lamont-Kane, Paul. "Physical and numerical modelling of wave energy converter arrays." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.679215.

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This thesis investigates the effects of hydrodynamic interactions within arrays of wave energy converters, provides a significant amount of much needed physical model data to the industry for validation purposes and assesses the relative suitability of various numerical models for use in isolated device and array studies. Experience gained from two large sets of physical experiments undertaken early in the project resulted in the planning, preparation, design and execution of a third set of experiments, the results of which have been reported in this thesis. The physical data obtained allowed
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Eriksson, Carolina. "Model Predictive Control of CorPower Ocean Wave Energy Converter." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196859.

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Wave power is currently a hot topic of research, and has shown great potential as a renewable energy source. There have been lot of progress made in developing cost effective Wave Energy Converters (WECs) that can compete with other sources of energy in regard to price and electrical power. Theoretical studies has shown that optimal control can increase the generated power for idealized WECs. This thesis is done in collaboration with CorPower Ocean, and investigates the use of economic Model Predictive Control (MPC) to control the generator torque in a light, point-absorbing, heaving WEC that i
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Guaraldi, Irene. "Hydraulic evaluation of the gyro electric wave energy converter." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8427/.

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Motivation Thanks for a scholarship offered by ALma Mater Studiorum I could stay in Denmark for six months during which I could do physical tests on the device Gyro PTO at the Departmet of Civil Engineering of Aalborg University. Aim The goal of my thesis is an hydraulic evaluation of the device: Gyro PTO, a gyroscopic device for conversion of mechanical energy in ocean surface waves to electrical energy. The principle of the system is the application of the gyroscopic moment of flywheels equipped on a swing float excited by waves. The laboratory activities were carried out by: Morten
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Brandt, Anders, and Piotr Zakrzewski. "Model Predictive Contorol of a Wave Energy Converter -3DOF." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21944.

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There is a demand for renewable energy in today’s society. Wave energy is a nearly untapped source of renewable energy. Ocean Harvesting Technologies AB (OHT) is currently developing a device that can be used to convert wave energy into electricity. The device is a Wave Energy Converter of the type point absorber. Their concept is a floating buoy that is connected to the seafloor via a Power Take-Off (PTO) unit. The PTO unit is equipped with generators, which are used to convert kinetic energy of the buoy into electricity. The objective of this thesis is to control the generators to optimize t
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Zhou, Tianzhi. "Damping Profile Research for Corpower Ocean's Wave Energy Converter." Thesis, KTH, Optimeringslära och systemteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-181315.

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With increasing energy demanding and greenhouse gases from fossil fuel, the need to develop new ways to convert energy in sustainable methods is becoming more and more urgent. Corpower Ocean AB designed a point absorber type wave energy converter to harvest energy from surface wave. To maximize the energy output, phase and amplitude control of the converter are needed. Falnes and Budal proposed latching around 1980s which could deliver almost perfect phase and thusly boost power output, however, the peaky machinery force and power output result from it’s discontinuity remained a problem. A con
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Antar, Robert, and Daniel Gonzalez. "Miniature wave energy converter using dual rotating dynamic axes." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326275.

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Cheemakurthy, Harsha. "Load case analysis for a resonant Wave Energy Converter." Thesis, KTH, Marina system, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185261.

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As we progress beyond the information age, there is a growing urgency towards sustainability. This word is synonymous with the way we produce energy and there is an awareness to gradually shift towards green energy production. Corpower Ocean aims at producing energy by utilizing the perpetual motion of ocean waves through the motion of small floating buoys. Unlike previous designs, this buoy utilizes the phenomenon of Resonance thus greatly enhancing the energy output. In the thesis, the simulation model developed by Corpower Ocean to virtually describe the buoy in operation was validated. Thi
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Nebel, Paul. "Synthesis of optimal control of a wave energy converter." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/12708.

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The thesis begins by describing the experimental determination of the hydrodynamic coefficients of two test models; an Edinburgh duck and a semi-submerged, horizontal right circular cylinder. The impedance and wave force coefficient matrices are measured for these two models, and in the case of the cylinder are checked against exact analytical results. The radiation and scattering pattern matrices are also measured. Synthesis of optimal (complex-conjugate) control is achieved for the cylinder in one and two degrees-of-freedom, and for the duck in one, two and three degrees-of-freedom. Synthesi
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Kapell, Jennie. "Analysis of the Inner Flow in the Wave Energy Converter WaveTube." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102293.

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Wave energy technology is currently growing and gaining popularity. With around 100 separate technologies researched globally in over 25 countries wave energy are believed to soon be able to compete with other renewable sources such as wind energy. One of the new technologies is WaveTube; a wave energy converter currently under development and in need of technical verification. The basic idea of WaveTube is a partially submerged container with an enclosed fresh water volume. The kinetic energy of the ocean waves are transferred onto the floating container, creating an inner flow in the structu
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Ulvin, Johannes Christopher. "Grid Integration of the Wave Energy Converter Bolt2 : Control of the Grid Side Converter with Energy Storage." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19042.

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This thesis is written in cooperation with Fred Olsen&apos;s Wave Energy Project Bolt2 which is a Wave Energy Converter (WEC) recently deployed outside of Falmouth Bay in the UK. After the initial phases of testing, the device is to be grid connected to the local distribution network. The purpose of this thesis is to develop a model that can serve as a useful starting point for investigating grid connection issues for Wave Energy Converters or as a part of a complete wave-to-wire modelling of a WEC. The Bolt2 project will be used as a framework for the thesis. Measurements from the testing of
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Folley, Matthew S. "The design of point absorbing wave energy converters." Thesis, Lancaster University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340789.

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41

Fu, Xiaoxing. "Restricted complexity control design for wave energy converters." Thesis, University of Leicester, 2017. http://hdl.handle.net/2381/40811.

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This thesis introduces various control system designs for wave energy converters. It describes optimal conditions for maximizing the energy absorbed from wave energy converters. Feedback realisation of complex-conjugate control and velocity-tracking control are used to create these conditions. Also, passive loading control and latching control, which correspond to non-optimal conditions, are both discussed here. Several different ways of overcoming the non-causal problem of optimal conditions are also discussed. Firstly, prediction of wave elevation or excitation force can be used to solve the
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Castellucci, Valeria. "Sea Level Compensation System for Wave Energy Converters." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-295603.

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The wave energy converter developed at Uppsala University consists of a linear generator at the seabed driven by the motion of a buoy on the water surface. The energy absorbed by the generator is negatively affected by variations of the mean sea level caused by tides, changes in barometric pressure, strong winds, and storm surges. The work presented in this doctoral thesis aims to investigate the losses in energy absorption for the present generation wave energy converter due to the effect of sea level variations, mainly caused by tides. This goal is achieved through the modeling of the intera
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Rahoor, Apram. "Comparison of Control Strategies for Wave Energy Converters." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423110.

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The development of wave power generation has been carried out since the 1790s. The technology involves capturing the energy of the wave using an actuation mechanism and converting it into useful work. Over the years many kinds of wave energy converters have been designed with varying rates of success. Novige has redesigned the buoy to a rectangular form thereby increasing the wetted area compared to standard round buoys. The primary approach for power absorption for Novige is latching control. But, different other control strategies were also proposed. The objective of the thesis is to compare
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Nachev, Aleksandar. "Comparative analysis of winch-based wave energy converters." Thesis, KTH, Maskinkonstruktion (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209539.

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Renewable energy sources are probably the future of the mankind. The main points advocating wave energy in particular include its huge potential, low environmental impact and availability around the globe. In order to harvest that energy, however, engineers have to overcome, among others, the corrosive sea environment and the unpredictable storms as well as secure funding for research and development. A lot of effort has been put into building and testing WECs after the oil crisis in the 1970s and is now being used as a starting point to create the modern alternatives to fossil fuels. The purp
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Bassili, Niclas, and Douglas Eriksson. "An evaluation of deterministic prediction of ocean waves using pressure data to assist a Wave Energy Converter." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279600.

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Currently, existing devices for extracting electrical power from ocean waves all suffer from problems with low efficiency due to a lack of information about the incoming waves in advance. The complex dynamic nonlinear characteristics of the ocean make the prediction of these incoming waves a great challenge. This paper aims to investigate a deterministic short-term wave-by-wave prediction system, that can accurately predict the wave height and timing of the incoming waves, based on measurements from a submerged pressure sensor. The complete prediction process contains three steps, namely recon
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Baker, Nicholas Jon. "Linear generators for direct drive marine renewable energy converters." Thesis, Durham University, 2003. http://etheses.dur.ac.uk/696/.

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This thesis is concerned with the development of linear generators for use as the power take off mechanism in marine renewable energy converters. Delivering significant power at the low velocities demanded by wave and tidal stream energy converters requires a large force, which must be reacted by an electrical machine in a direct drive system. Attention is focused on the development of two novel topology linear permanent magnet machines suitable for use in this application. For each topology, models are presented that are capable of predicting the force characteristics and dynamic generator pe
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Elamalayil, Soman Deepak. "Multilevel Power Converters with Smart Control for Wave Energy Conversion." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-332730.

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The main focus of this thesis is on the power electronic converter system challenges associated with the grid integration of variable-renewable-energy (VRE) sources like wave, marine current, tidal, wind, solar etc. Wave energy conversion with grid integration is used as the key reference, considering its high energy potential to support the future clean energy requirements and due the availability of a test facility at Uppsala University. The emphasis is on the DC-link power conditioning and grid coupling of direct driven wave energy converters (DDWECs). The DDWEC reflects the random nature o
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Steynor, Jeffrey Robert. "Minimising the lifetime carbon and energy intensities of the Oyster wave energy converter." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/17959.

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Converting energy from ocean waves is an exciting concept aimed at reducing our dependency on fossil fuels. Ocean energy devices must convert the large forces and relatively small movements from ocean waves into electrical power with a minimum carbon and energy intensity in order to be economically viable. The research herein focuses on the Oyster, a flap-type pitching wave energy converter developed by Aquamarine Power. A device that has the minimal carbon or energy intensity is not necessarily the most mechanically efficient. A commercially viable wave energy converter should have a competit
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Angelelli, Elisa. "Evaluation of the power production performance of the wavepiston, wave energy converter." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/1729/.

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In the early 1970 the community has started to realize that have as a main principle the industry one, with the oblivion of the people and health conditions and of the world in general, it could not be a guideline principle. The sea, as an energy source, has the characteristic of offering different types of exploitation, in this project the focus is on the wave energy. Over the last 15 years the Countries interested in the renewable energies grew. Therefore many devices have came out, first in the world of research, then in the commercial one; these converters are able to achieve an energy
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Bånkestad, Maria. "Modeling, Simulation and Dynamic control of a Wave Energy Converter." Thesis, KTH, Numerisk analys, NA, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-134104.

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The energy in ocean waves is a renewable energy resource not yet fully exploited. Research in converting ocean energy to useful electricity has been ongoing for about 40 years, but no one has so far succeed to do it at sufficiently low cost. CorPower Ocean has developed a method, which in theory can achieve this. It uses a light buoy and a control strategy called Phase Control. The purpose of this thesis is to develop a mathematical model of this method - using LinearWave Theory to derive the hydrodynamic forces - and from the simulated results analyze the energy output of the method. In the p
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