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Author : Nikola Gargov
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (876 download)
Download or read book Permanent Magnet Linear Generators for Marine Wave Energy Converters written by Nikola Gargov and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Aaron H. VanderMeulen
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (156 download)
Download or read book Novel Control of a Permanent Magnet Linear Generator for Ocean Wave Energy Applications written by Aaron H. VanderMeulen and published by . This book was released on 2008 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wave energy conversion devices are a rapidly growing interest worldwide for the potential to harness a sustainable and renewable energy source. Due to the oscillatory nature of ocean waves, the power generated from a permanent magnet linear generator (PMLG) for ocean wave energy conversion is pulsed. Focusing on direct drive technology, the PMLG directly translates the motion of the waves into electrical energy. The power generated, left unconditioned, is not easily used or stored. With conventional diode rectification topologies, line currents can not be controlled easily, resulting in an uncontrolled generator output and force. With an active rectifier topology, the real and reactive power from the PMLG is fully controllable. This thesis will investigate the generator modeling and design of a novel three-phase active rectifier topology and force controller with a dc-dc converter for bus voltage regulation. An in depth analysis for the controller design and simulations are presented. Hardware for the three-phase active rectifier is specified and built with initial lab test results. The controller design is implemented with National Instruments0́9 LabView and compiled on a CompactRIO real-time controller.
Author : Omar Farrok
Publisher : Springer Nature
ISBN 13 : 981999814X
Total Pages : 187 pages
Book Rating : 4.8/5 (199 download)
Download or read book Oceanic Wave Energy Conversion written by Omar Farrok and published by Springer Nature. This book was released on with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph H. Prudell
Publisher :
ISBN 13 :
Total Pages : 326 pages
Book Rating : 4.:/5 (191 download)
Download or read book Novel Design and Implementation of a Permanent Magnet Linear Tubular Generator for Ocean Wave Energy Conversion written by Joseph H. Prudell and published by . This book was released on 2008 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world's energy consumption is growing at an alarming rate and the need for renewable energy is apparent now more than ever. Estimates have shown that optimization of the extraction of energy from the ocean could significantly aid the world's quest for sustainable and affordable energy services for all. From small power data buoys to generating power for coastal communities, everyone stands to benefit from the technological optimization of ocean wave energy devices. This thesis explores the design and implementation of a novel permanent magnet linear generator for direct drive ocean wave energy extraction point absorber buoys. The design optimizes the armature and magnet sections of a permanent magnet linear tubular generator (PMLTG) for the purposes of maximizing the energy conversion efficiency while minimizing cogging forces. Cogging forces in a linear generator influence power fluctuations and hydrodynamic performance of the wave energy extraction system. Implementation techniques involving the construction and mechanical design aspects are included.
Author : Irina Alexeevna Ivanova
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (186 download)
Download or read book Simulation of Linear Permanent Magnet Octagonal Generator for Sea Wave Energy Conversion written by Irina Alexeevna Ivanova and published by . This book was released on 2004 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sandra Eriksson
Publisher : MDPI
ISBN 13 : 3039213504
Total Pages : 282 pages
Book Rating : 4.0/5 (392 download)
Download or read book Permanent Magnet Synchronous Machines written by Sandra Eriksson and published by MDPI. This book was released on 2019-08-20 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in permanent magnet synchronous machines (PMSMs) is continuously increasing worldwide, especially with the increased use of renewable energy and the electrification of transports. This book contains the successful submissions of fifteen papers to a Special Issue of Energies on the subject area of “Permanent Magnet Synchronous Machines”. The focus is on permanent magnet synchronous machines and the electrical systems they are connected to. The presented work represents a wide range of areas. Studies of control systems, both for permanent magnet synchronous machines and for brushless DC motors, are presented and experimentally verified. Design studies of generators for wind power, wave power and hydro power are presented. Finite element method simulations and analytical design methods are used. The presented studies represent several of the different research fields on permanent magnet machines and electric drives.
Author : Mohamed Benbouzid
Publisher : MDPI
ISBN 13 : 3039282786
Total Pages : 174 pages
Book Rating : 4.0/5 (392 download)
Download or read book Marine Tidal and Wave Energy Converters written by Mohamed Benbouzid and published by MDPI. This book was released on 2020-03-05 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The worldwide potential of electric power generation from marine tidal currents, waves, or offshore winds is enormous. The high load factor resulting from the fluid properties and the predictable resource characteristics make tidal and wave energy resources attractive and advantageous for power generation and advantageous when compared to other renewable energies. The technologies are just beginning to reach technical and economic viability to make them potential commercial power sources in the near future. While only a few small projects currently exist, the technology is advancing rapidly and has huge potential for generating bulk power. Moreover, international treaties related to climate control and dwindling fossil fuel resources have encouraged us to harness energy sustainably from such marine renewable sources. Several demonstrative projects have been scheduled to capture tidal and wave energies. A number of these projects have now reached a relatively mature stage and are close to completion. However, very little is known to the academic world about these technologies beyond the basics of their energy conversion principles. While research emphasis is more towards hydrodynamics and turbine design, very limited activities are witnessed in power conversion interface, control, and power quality aspects. Regarding this emerging and promising area of research, this book aims to present recent results, serving to promote successful marine renewable energies integration to the grid or to standalone microgrids.
Author : Joao Cruz
Publisher : Springer Science & Business Media
ISBN 13 : 3540748954
Total Pages : 435 pages
Book Rating : 4.5/5 (47 download)
Download or read book Ocean Wave Energy written by Joao Cruz and published by Springer Science & Business Media. This book was released on 2007-12-22 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors of this timely reference provide an updated and global view on ocean wave energy conversion – and they do so for wave energy developers as well as for students and professors. The book is orientated to the practical solutions that this new industry has found so far and the problems that any device needs to face. It describes the actual principles applied to machines that convert wave power to electricity and examines state-of-the-art modern systems.
Author : Nathan Michael Tom
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (94 download)
Download or read book Design and Control of a Floating Wave-Energy Converter Utilizing a Permanent Magnet Linear Generator written by Nathan Michael Tom and published by . This book was released on 2013 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis considers the design, optimization, and control of a coupled cylindrical floater and permanent magnet linear generator for wave-energy conversion. The investigation begins with the construction of the time-domain equation of motion for a generic floating body. The construction of a physical cylindrical floater is followed by a description of the experiments completed to verify free-motion and wave-exciting force predictions. The time-domain equation of motion was compared against experiments where it was found that corrective terms needed to be added due to the presence of viscosity. Initial low motion amplitudes lead to evaluation of the hydrodynamic performance between a floater with a flat and rounded-hemispherical bottom. Experimental results demonstrated that motion amplitudes can be over predicted by a factor of 2 when neglecting the effects of viscosity. Second, modifications to the design, fabrication process, and material of a permanent magnet linear generator (PMLG) will be discussed with the aim of increasing both power output and mechanical-to-electrical conversion efficiency. In order to evaluate the performance of the power-take-off unit a dry-bench test was completed which consisted of driving the armature of the PMLG at various frequencies with a fixed motion amplitude. The force signature from the bench test was used to extract the spring, damping, and inertia force coefficients due to the influence of the PMLG. The force coefficients were obtained for various speeds, resistive loads, and magnet coil gap widths. The floater equation of motion was modified to accommodate the influence of the PMLG to predict the coupled system performance. As the damping coefficient was the dominant contribution to the PMLG reaction force, the optimum non time-varying damping values were presented for all frequencies, recovering the well known impedance matching at the coupled resonance frequency. Model-scale tests of the coupled floater-generator system were performed at the UC-Berkeley Model Testing Facility to verify the optimum conditions for energy extraction. In an effort to further maximize power absorption, nonlinear model predictive control (NMPC) was applied to the model-scale point absorber. The NMPC strategy was set up as a nonlinear optimization problem utilizing the Interior Point OPTimizer (IPOPT) package to obtain the optimal time-varying generator damping from the PMLG. This was accompanied by a latching damper that was allowed to periodically slow the floater velocity in an effort to increase power absorption. The emphasis on this work has been on sub-optimal strategies that limit the power-take-off unit to behave as a generator, thereby minimizing energy return to the waves. It was found that the ideal NMPC strategy required a PTO unit that could be turned on and off instantaneously, leading to sequences where the generator would be inactive for up to 60% of the wave period. Experimental validation of the NMPC included repeating the dry bench test in order to characterize the time-varying performance of the PMLG. This was achieved through the use of mechanical relays to control when the electromagnetic conversion process would be active. After the time-varying performance of the PMLG was characterized the experimental set-up was transferred to the wave tank. The on/off sequencing of the PMLG was tested under regular and irregular wave excitation to validate NMPC simulations using the control inputs obtained from running the controller offline. Experimental results indicate that successful implementation was achieved and the absorbed power was indeed maximized.
Author : Wei Xu
Publisher : Springer Nature
ISBN 13 : 9811396167
Total Pages : 341 pages
Book Rating : 4.8/5 (113 download)
Download or read book Advanced Linear Machines and Drive Systems written by Wei Xu and published by Springer Nature. This book was released on 2019-09-07 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book collects the latest theoretical and technological concepts in the design and control of various linear machines and drive systems. Discussing advances in the new linear machine topologies, integrated modeling, multi-objective optimization techniques, and high-performance control strategies, it focuses on emerging applications of linear machines in transportation and energy systems. The book presents both theoretical and practical/experimental results, providing a consistent compilation of fundamental theories, a compendium of current research and development activities as well as new directions to overcome critical limitations.
Author : Michael A. Stelzer
Publisher : AuthorHouse
ISBN 13 : 1477244948
Total Pages : 169 pages
Book Rating : 4.4/5 (772 download)
Download or read book Evaluation of Ocean-Energy Conversion Based on Linear Generator Concepts written by Michael A. Stelzer and published by AuthorHouse. This book was released on 2012-07-03 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: EVALUATION OF OCEAN-ENERGY CONVERSION BASED ON LINEAR GENERATOR CONCEPTS As the world continues to demand greater productivity and lifestyle enrichment through technological advancements, the demand for electrical power is predicted to escalate dramatically. Thus far, this increased demand has been primarily supplied from fossil fueled plants. Unfortunately, the burning of fossil fuels produce harmful carbon dioxide pollution as a by-product. It has been hypothesized that unless a clean, renewable, and efficient alternate source of energy is found soon, the world may either exhaust its supplies of energy-producing materials or drastically degrade its environment. However, motions that occur naturally, such as ocean waves, can play a significant role in generating environmentally safe and economically viable energy for human utilization. The focus of this work predicts the electrical power generation capabilities from a seabed mounted linear generator tethered to a floating buoy heaving under the influence of passing ocean surface waves. Mathematical models are introduced which simulate the oceans' surface conditions under both the regular (basic) and irregular (natural) wave regimes, the heave (vertical displacement) response for a floating buoy, and the resulting electrical output parameters of the linear generator. Within these models, various physical and electrical parameters are altered in an attempt to generate a greater output power for a given sea state condition, making the Wave Energy Converter (WEC) more efficient. It is shown theoretically that the buoy can be designed to have a greater heave response than that of the height of a passing wave resulting in an increase in generated power from the linear generator. Author Information: Dr. Michael A. Stelzer is a Certified Project Manager and Senior Electronic Technician with a Ph.D. in Electrical and Computer Engineering. During his career to date, Mr. Stelzer has published four additional educational titles and has been admitted into Cambridge Who's Who top 101 industry experts.
Author : Steven George Ernst
Publisher :
ISBN 13 :
Total Pages : 262 pages
Book Rating : 4.:/5 (375 download)
Download or read book A Novel Linear Generator for Wave Energy Applications written by Steven George Ernst and published by . This book was released on 2009 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the increasing effort to identify alternative methods of energy generation, extraction of ocean energy has gathered a large interest. Research and industry have begun considering wave energy as the next new alternative energy. The unique challenges of ocean energy requires a wave energy converter to be both robust and efficient. When looking further into energy extraction via the point absorber technology, a direct drive linear generator efficiently converts the vertical wave motion into electrical energy. With considerations of long term reliability in an ocean environment as well as design to product cost, a longitudinal flux variable reluctance permanent magnet generator is a promising generator topology. This thesis identifies the reasons behind the selection of this particular generator topology for a point absorber. It provides a description of the generator topology and operation before continuing with the details as to the development of a variable reluctance permanent magnet generator with specifically known design constraints. The thesis further describes the implementation, testing, and results of such a device, while touching on considerations to take into account throughout the design process.
Author : Oskar Danielsson
Publisher :
ISBN 13 : 9789155466831
Total Pages : 102 pages
Book Rating : 4.4/5 (668 download)
Download or read book Wave Energy Conversion written by Oskar Danielsson and published by . This book was released on 2006 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rael Schmulian
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (83 download)
Download or read book Reduction of Cogging Forces in a Double Sided Tubular Linear Permanent Magnet Generator Used for Ocean Wave Energy Conversion written by Rael Schmulian and published by . This book was released on 2012 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sanjida Moury
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (654 download)
Download or read book Design of Low Speed Axial Flux Permanent Magnet Generators for Marine Current Application written by Sanjida Moury and published by . This book was released on 2010 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mihajlo Ljubomir Curcic
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (132 download)
Download or read book Novel Double-sided Linear Generator for the Wave Energy Conversion written by Mihajlo Ljubomir Curcic and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The direct drive point absorber is a robust and efficient system for wave energy harvesting, where the linear generator represents the most complex part of the system. Therefore, its design and optimization are crucial tasks. The tubular shape of a linear generator's magnetic circuit offers better permanent magnet flux encapsulation and reduction in radial forces on the translator due to its symmetry. A double stator topology can improve the power density of the linear tubular machine. Common designs employ a set of aligned stators on each side of a translator with radially magnetized permanent magnets. Such designs require doubling the amount of permanent magnet material and lead to an increase in the cogging force. The design presented in this thesis utilizes a translator with buried axially magnetized magnets and axially shifted positioning of the two stators such that no additional magnetic material, compared to single side machine, is required. In addition to the conservation of magnetic material, a significant improvement in the cogging force occurs in the two phase topology, while the double sided three phase system produces more power at the cost of a small increase in the cogging force. The analytical and the FEM models of the generator are described and their results compared to the experimental results. In general, the experimental results compare favourably with theoretical predictions. However, the experimentally observed permanent magnet flux leakage in the double sided machine is larger than predicted theoretically, which can be justified by the limitations in the prototype fabrication and resulting deviations from the theoretical analysis.
Author : Bernard Multon
Publisher : John Wiley & Sons
ISBN 13 : 111860329X
Total Pages : 480 pages
Book Rating : 4.1/5 (186 download)
Download or read book Marine Renewable Energy Handbook written by Bernard Multon and published by John Wiley & Sons. This book was released on 2013-02-07 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine renewable energy is a significant resource for generating electricity, and if some conversion technologies have already reached a certain level of maturity, others are emerging. The originality of this multidisciplinary book is to offer a broad spectrum of knowledge from academic and industry experts of various origins. It deals with general aspects such as the specificities and constraints of the marine environment, the concepts of hydrodynamics and ocean engineering, as well as the industrial and economic sides necessary for the assembly of projects. It also discusses conversion technologies such as offshore wind, tidal power plants, tidal stream turbines, wave energy converters and ocean thermal energy plants. Finally, two chapters are devoted to power electronic conversion and power transmission cables.
