Testing of Wave Energy Converters Using the Ocean Sentinel Instrumentation Buoy PDF Download

Author: Terrance Michael Lettenmaier
Publisher:
ISBN:
Category : Automatic data collection systems
Languages : en
Pages : 172

View

Book Description
Ocean testing of Wave Energy Converter (WEC) prototypes is necessary to facilitate commercial WEC development. The Ocean Sentinel Instrumentation Buoy, completed in August 2012, provides a stand-alone load for WEC prototypes during ocean testing. The first part of this work was to develop the power conversion and data acquisition equipment installed on board the Ocean Sentinel that is used to test WECs. The functionality of this equipment was demonstrated during August-October 2012 ocean testing of the half-scale WET-NZ wave energy converter. WET-NZ is an acronym for "Wave Energy Technology-New Zealand". The second part of this work was to develop a maximum power point tracking (MPPT) algorithm that can automatically track optimum control settings of WECs as sea conditions change. During the WET-NZ tests, a cycling MPPT algorithm was developed that provided more effective tracking of the optimum WET-NZ control input than was possible with standard perturb and observe MPPT algorithms. The effectiveness of the cycling MPPT algorithm was verified later during more systematic testing of MPPT algorithms using a WEC emulator, developed as part of this project, to simulate WEC operation.

Author: Bimal K. Bose
Publisher: John Wiley & Sons
ISBN: 1119515653
Category : Technology & Engineering
Languages : en
Pages : 705

View

Book Description
The comprehensive and authoritative guide to power electronics in renewable energy systems Power electronics plays a significant role in modern industrial automation and high- efficiency energy systems. With contributions from an international group of noted experts, Power Electronics in Renewable Energy Systems and Smart Grid: Technology and Applications offers a comprehensive review of the technology and applications of power electronics in renewable energy systems and smart grids. The authors cover information on a variety of energy systems including wind, solar, ocean, and geothermal energy systems as well as fuel cell systems and bulk energy storage systems. They also examine smart grid elements, modeling, simulation, control, and AI applications. The book's twelve chapters offer an application-oriented and tutorial viewpoint and also contain technology status review. In addition, the book contains illustrative examples of applications and discussions of future perspectives. This important resource: Includes descriptions of power semiconductor devices, two level and multilevel converters, HVDC systems, FACTS, and more Offers discussions on various energy systems such as wind, solar, ocean, and geothermal energy systems, and also fuel cell systems and bulk energy storage systems Explores smart grid elements, modeling, simulation, control, and AI applications Contains state-of-the-art technologies and future perspectives Provides the expertise of international authorities in the field Written for graduate students, professors in power electronics, and industry engineers, Power Electronics in Renewable Energy Systems and Smart Grid: Technology and Applications offers an up-to-date guide to technology and applications of a wide-range of power electronics in energy systems and smart grids.

Author: Junhui Lou
Publisher:
ISBN:
Category : Computational fluid dynamics
Languages : en
Pages : 174

View

Book Description
This dissertation studies the coupled fluid-structure interaction (FSI) of a wave energy converter (WEC) and evaluates the design of a WEC mooring system. The research is conducted in support of conceptual development, field test and performance evaluation of WECs as part of the mission of the Northwest National Marine Renewable Energy Center at Oregon State University. The coupled FSI study focuses on the evaluation of predictive capabilities and computational performance of commercial computational fluid dynamics (CFD) and potential flow codes using laboratory model test results. The evaluations of a WEC mooring system focus on analysis of field test data and evaluations of the anchor movability, fatigue design and extreme load of the Ocean Sentinel (OS) test platform mooring system deployed off the Oregon coast. Numerical data using a commercial mooring system simulation code are conducted to supplement time history data for the calculations of anchor pulling force, fatigue damage and extreme load. Specifically, this dissertation can be divided into three parts. In the first part the performances of a finite element explicit Navier-Stokes (NS) solver (LS-DYNA ALE), a finite element implicit NS solver (LS-DYNA ICFD), and a nonlinear potential flow solver (AQWA) in predicting highly nonlinear hydrodynamic responses of a floating point absorber (FPA) under large-amplitude waves are studied. The two NS solvers calculate the coupled FSI including fully nonlinear inviscid and viscous forces. The nonlinear potential flow solver calculates individual inviscid wave force components (a Froud-Krylov force, a radiation force, a diffraction force and a hydrostatic force) and empirical (Morison equation) viscous force. Comparing numerical results to laboratory experimental measurements, the two NS solvers and the nonlinear potential flow solver are found to be capable of providing accurate predictions of the nonlinear motion responses of the FPA. FSI coupling algorithms and computational costs of these three solvers are evaluated. Based on the results of the nonlinear potential flow solver at different wave periods, the individual wave force components and the viscous force are studied quantitatively. The nonlinearity of the restoring force and the Froude-Krylov force are found to be important for the FPA responses in all (heave, surge and pitch) directions; the nonlinearity of the viscous force is found to be important in only the heave and pitch directions. The second part first presents a catenary spread mooring system design of a mobile ocean test berth (MOTB), the Ocean Sentinel (OS) instrumentation buoy, which is developed by the Northwest National Marine Renewable Energy Center (NNMREC) to facilitate ocean test of wave energy converters (WECs). Then the OS mooring design, which is similar to a conventional WEC point absorber mooring system, is evaluated through both field test analysis and quasi-static analysis: the field test analysis is based on the extensive data of the OS positions, mooring tensions on the OS and environmental conditions of waves, wind and current, collected during the 2013 field test of the OS mooring system; the quasi-static analysis is based on the analytical catenary equations of mooring chains. Both global characteristics and survivability characteristics of the mooring system are evaluated: the global characteristics include the influence of the OS excursion to mooring tension, positional distribution of the OS, directional control of the OS and environmental contributions of waves, current and wind to mooring tensions; the survivability characteristics include the anchor movability and strength capacities of mooring. Because anchor movement occurred near the end of the field test, a systematic procedure of designing a mooring system with adequate anchor holding capacity is developed and applied to design a new OS mooring system. In the third part, first, the accuracies of a fully coupled method based numerical model in predicting the mooring tensions of the OS mooring system and the OS positions are validated by comparing the numerical results to the field data collected during the 2013 OS field test. Then, the anchor movability, fatigue damage and extreme mooring tension of the OS mooring system are investigated using the mooring tensions predicted by the numerical model. The results of the above studies are summarized as follows: (1) The numerical model provides accurate predictions of the mooring tensions and OS positions under harsh environmental conditions; (2) When the OS drifted significantly near the end of the field test, the bow, port and starboard anchors were likely not dragged, dragged significantly and dragged slightly, respectively; (3) The fatigue damages of mooring lines are predicted for environmental conditions from low to high sea states; and (4) The strengths of mooring lines in the original mooring design are adequate compared to the predicted extreme mooring tensions.

Author: United States. Congress. Senate. Committee on Energy and Natural Resources
Publisher:
ISBN:
Category : Federal aid to water resources development
Languages : en
Pages : 24

View

Book Description

Author: Michael A. Stelzer Ph. D.
Publisher: AuthorHouse
ISBN: 1477213082
Category : Education
Languages : en
Pages : 169

View

Book Description
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: United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on Water and Power
Publisher:
ISBN:
Category : Dams
Languages : en
Pages : 88

View

Book Description

Author: Dezhi Ning
Publisher: CRC Press
ISBN: 1000629112
Category : Technology & Engineering
Languages : en
Pages : 384

View

Book Description
Wave energy offers a promising renewable energy source, however, technologies converting wave energy into useful electricity face many design challenges. This guide presents numerical modelling and optimization methods for the development of wave energy converter technologies, from principles to applications. It covers the development status and perspectives of wave energy converter systems; the fundamental theories on wave power absorption; the modern wave energy converter concepts including oscillating bodies in single and multiple degree of freedom and oscillating water column technologies; and the relatively hitherto unexplored topic of wave energy harvesting farms. It can be used as a specialist student textbook as well as a reference book for the design of wave energy harvesting systems, across a broad range of disciplines, including renewable energy, marine engineering, infrastructure engineering, hydrodynamics, ocean science, and mechatronics engineering. The Open Access version of this book, available at www.routledge.com has been made available under a Creative Commons Attribution-Non Commercial-No Derivatives 4.0 license.

Author: Aurelien Babarit
Publisher: Elsevier
ISBN: 0081023901
Category : Technology & Engineering
Languages : en
Pages : 264

View

Book Description
The waves that animate the surface of the oceans represent a deposit of renewable energy that for the most part is still unexploited today. This is not for lack of effort, as for more than two hundred years inventors, researchers and engineers have struggled to develop processes and systems to recover the energy of the waves. While all of these efforts have failed to converge towards a satisfactory technological solution, the result is a rich scientific and technical literature as well as extensive and varied feedback from experience. For the uninitiated, this abundance is an obstacle. In order to facilitate familiarization with the subject, we propose in this work a summary of the state of knowledge on the potential of wave energy as well as on the processes and technologies of its recovery (wave energy converters). In particular, we focus on the problem of positioning wave energy in the electricity market, the development of wave energy conversion technologies from a historical perspective, and finally the energy performance of the devices. This work is aimed at students, researchers, developers, industry professionals and decision makers who wish to acquire a global perspective and the necessary tools to understand the field. Reviews the state of knowledge and developments on wave energy recovery Presents the history of wave energy recovery Classifies the various systems for recovering this type of energy

Author: Michael E. McCormick
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 264

View

Book Description
This volume will prove of vital interest to those studying the use of renewable resources. It presents physical and mathematical descriptions of the nine generic wave energy conversion techniques, along with their uses and performance characteristics, plus several electro-mechanical energy conversion techniques and worked examples. 1981 edition.

Author: Lucia Margheritini
Publisher:
ISBN:
Category :
Languages : en
Pages :

View

Book Description