Dissertations / Theses on the topic 'Wind energy conversion systems Stability'
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Jayam, Prabhakar Aditya. "Application of STATCOM for improved dynamic performance of wind farms in a power grid." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Jayam_Prabhakar_09007dcc804f7428.pdf.
Full textVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 12, 2008) Includes bibliographical references (p. 64-66).
Buehrle, Bridget Erin. "Modeling of Small-Scale Wind Energy Conversion Systems." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/50920.
Full textThe study of the diffuser augmented wind turbine provides optimum dimensions for achieving high power density that can address the challenges associated with small scale wind energy systems; these challenges are to achieve a lower start-up speed and low wind speed operation. The diffuser design was modeled using commercial computational fluid dynamics code. Two-dimensional modeling using actuator disk theory was used to optimize the diffuser design. A statistical study was then conducted to reduce the computational time by selecting a descriptive set of models to simulate and characterize relevant parameters\' effects instead of checking all the possible combinations of input parameters. Individual dimensions were incorporated into JMP® software and randomized to design the experiment. The results of the JMP® analysis are discussed in this paper. Consistent with the literature, a long outlet section with length one to three times the diameter coupled with a sharp angled inlet was found to provide the highest amplification for a wind turbine diffuser.
The second study consisted of analyzing the capabilities of a small-scale vertical axis wind turbine. The turbine consisted of six blades of extruded aluminum NACA 0018 airfoils of 0.08732 m (3.44 in) in chord length. Small-scale wind turbines often operate at Reynolds numbers less than 200,000, and issues in modeling their flow characteristics are discussed throughout this thesis. After finding an appropriate modeling technique, it was found that the vertical axis wind turbine requires more accurate turbulence models to appropriately discover its performance capabilities.
The use of tubercles on aerodynamic blades has been found to delay stall angle and increase the aerodynamic efficiency. Models of 440 mm (17.33 in) blades with and without tubercles were fabricated in Virginia Tech\'s Center for Energy Harvesting Materials and Systems (CEHMS) laboratory. Comparative analysis using three dimensional models of the blades with and without the tubercles will be required to determine whether the tubercle technology does, in fact, delays the stall. Further computational and experimental testing is necessary, but preliminary results indicate a 2% increase in power coefficient when tubercles are present on the blades.
Master of Science
Trilla, Romero Lluís. "Power converter optimal control for wind energy conversion systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/134602.
Full textWind energy has increased its presence in many countries and it is expected to have even a higher weight in the electrical generation share with the implantation of offshore wind farms. Consequently, the wind energy industry has to take greater responsibility towards the integration and stability of the power grid. In this sense, there are proposed in the present work control systems that aim to improve the response and robustness of the wind energy conversion systems without increasing their complexity in order to facilitate their applicability. In the grid-side converter it is proposed to implement an optimal controller with its design based on H-infinity control theory in order to ensure the stability, obtain an optimal response of the system and also provide robustness. In the machine-side converter the use of a Linear Parameter-Varying controller is selected, this choice provides a controller that dynamically adapts itself to the operating point of the system, in this way the response obtained is always the desired one, the one defined during the design process. Preliminary analysis of the controllers are performed using models validated with field test data obtained from operational wind turbines, the validation process followed the set of rules included in the official regulations of the electric sector or grid codes. In the last stage an experimental test bench has been developed in order to test and evaluate the proposed controllers and verify its correct performance.
Mendonca, Jose Manuel de Araujo Baptista. "Microcomputer on-line control of wind energy conversion systems." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38101.
Full textWu, Feng. "Modelling and control of wind and wave energy conversion systems." Thesis, University of Birmingham, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525483.
Full textMacRae, Angus Neil. "Economic and cost engineering aspects of wind energy conversion systems." Thesis, Robert Gordon University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258961.
Full textMacmillan, Susan. "An appraisal of wind energy conversion systems for agricultural enterprises." Thesis, Robert Gordon University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330282.
Full textZoric, I. "Multiple three-phase induction generators for wind energy conversion systems." Thesis, Liverpool John Moores University, 2018. http://researchonline.ljmu.ac.uk/8387/.
Full textLi, Wenyan Kusiak Andrew. "Predictive engineering in wind energy a data-mining approach /." [Iowa City, Iowa] : University of Iowa, 2009. http://ir.uiowa.edu/etd/399.
Full textDiaz, Matias. "Control of the modular multilevel matrix converter for wind energy conversion systems." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/47157/.
Full textDíaz, Díaz Matías David. "Control of the modular multilevel Matrix converter for wind energy conversion systems." Tesis, Universidad de Chile, 2017. http://repositorio.uchile.cl/handle/2250/147484.
Full textLa potencia nominal de los Sistemas de Conversión de Energía Eólica se ha incrementado constantemente alcanzando niveles de potencia cercanos a los 10 MW. Por tanto, convertidores de potencia de media tensión están reemplazando a los convertidores Back-to-Back de baja tensión habitualmente empleados en la etapa de conversión de energía. Convertidores Modulares Multinivel se han posicionado como una solución atractiva para Sistemas de Conversión de Energía Eólica de alta potencia debido a sus buenas prestaciones. Algunas de estas prestaciones son la capacidad de alcanzar altos voltajes, modularidad y confiabilidad. En este contexto, esta tesis discute la aplicación del Convertidor Modular Matricial Multinivel para conectar Sistemas de Conversión de Energía Eólica de alta potencia. Los modelos matemáticos y estrategias de control requeridas para esta aplicación son descritos y discutidos en este documento. Las estrategias de control propuestas habilitan una operación desacoplada del convertidor, proporcionando seguimiento del máximo punto de potencia en el lado del generador eléctrico del sistema eólico, cumplimiento de normas de conexión en el lado de la red eléctrica y regulación de los condensadores flotantes del convertidor. La efectividad de las estrategias de control propuestas es validada a través de simulaciones y experimentos realizados con un prototipo de laboratorio. Las simulaciones se realizan con un Sistemas de Conversión de Energía Eólica de 10 MW operando a 6.6 kV. Dicho sistema se implementa en el software PLECS. Por otro, se ha desarrollado un prototipo de laboratorio de 6kVA durante el desarrollo de este proyecto. El prototipo de laboratorio considera un Convertidor Modular Matricial Multinivel de 27 módulos Puente-H . El sistema es controlado empleando una plataforma de control basada en una Digital Signal Processor conectada a tres tarjetas del tipo Field Programmable Gate Array que proveen de 50 mediciones análogo-digital y 108 señales de disparo. La entrada del convertidor es conectada a una fuente programable marca Ametek que emula el comportamiento de la turbina eólica. A su vez, la salida del convertidor es conectada a otra fuente programable con capacidad de producir fallas en la tensión. Los resultados obtenidos, tanto en el prototipo experimental como en simulación, confirman la operación exitosa del Convertidor Modular Matricial Multinivel en aplicaciones eólicas de alta potencia. En todos los casos, las estrategias de control propuestas aseguran regulación de la tensión en los condensadores flotantes, seguimiento del máximo punto de potencia en el lado del generador eléctrico del sistema eólico y cumplimiento de normas de conexión en el lado de la red eléctrica.
The nominal power of single Wind Energy Conversion Systems has been steadily growing, reaching power ratings close to 10MW. In the power conversion stage, medium-voltage power converters are replacing the conventional low-voltage back-to-back topology. Modular Multilevel Converters have appeared as a promising solution for Multi-MW WECSs due to their characteristics such as modularity, reliability and the capability to reach high nominal voltages. Thereby, this thesis discusses the application of the Modular Multilevel Matrix Converter (\mc) to drive Multi-MW Wind Energy Conversion Systems (WECSs). The modelling and control systems required for this application are extensively analysed and discussed in this document. The proposed control strategies enable decoupled operation of the converter, providing maximum power point tracking capability at the generator-side, grid-code compliance and Low Voltage Ride Through Control at the grid-side and good steady state and dynamic performance for balancing the capacitor voltages of the converter.\\ The effectiveness of the proposed control strategies is validated through simulations and experimental results. Simulation results are obtained with a 10MW, 6.6 kVM3C based WECS model developed in PLECS software. Additionally, a 5 kVA downscale prototype has been designed and constructed during this Ph.D. The downscale prototype is composed of 27 H-Bridges power cells. The system is controlled using a Digital Signal Processor connected to three Field Programmable Gate Array which are equipped with 50 analogue-digital channels and 108 gate drive signals. Two programmable AMETEK power supplies emulate the electrical grid and the generator. The wind turbine dynamics is programmed in the generator-side power supply to emulate a generator operating in variable speed/voltage mode. The output port of the M3C is connected to another power source which can generate programmable grid sag-swell conditions. Simulation and experimental results for variable-speed operation, grid-code compliance, and capacitor voltage regulation have confirmed the successful operation of the \mc{} based WECSs. In all the experiments, the proposed control systems ensure proper capacitor voltage balancing, keeping the flying capacitor voltages bounded and with low ripple. Additionally, the performance of the generator-side and grid-side control system have been validated for Maximum Power Point Tracking and Low-Voltage Ride Through, respectively.
Hostettler, Jacob. "Advanced Control of Permanent Magnet Synchronous Generators for Variable Speed Wind Energy Conversion Systems." Thesis, Southern Illinois University at Edwardsville, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1588620.
Full textVarious environmental and economic factors have lead to increased global investment in alternative energy technologies such as solar and wind power. Although methodologies for synchronous generator control are well researched, wind turbines present control systems challenges not presented by traditional generation. The varying nature of wind makes achieving synchronism with the existing electrical power grid a greater challenge. Departing from early use of induction machines, permanent magnet synchronous generators have become the focus of power systems and control systems research into wind energy systems. This is due to their self excited nature, along with their high power density. The problem of grid synchronism is alleviated through the use of high performance power electronic converters. In achievement of the optimal levels of efficiency, advanced control systems techniques oer promise over more traditional approaches. Research into sliding mode control, and linear matrix inequalities with nite time boundedness and H∞ performance criteria, when applied to the dynamical models of the system, demonstrate the potential of these control methodologies as future avenues for achieving higher levels of performance and eciency in wind energy.
Al-Qrimli, Fadhil Abbas Mehdi. "An energy conversion scheme using a permanent magnet generator and a PWM, GTO converter." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304736.
Full textHuang, Yuansheng. "Sliding Mode Observer Design for Permanent Magnetic Synchronous Generator Based Wind Energy Conversion Systems." Thesis, Southern Illinois University at Edwardsville, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10258376.
Full textReal-time rotor position and speed information is essential for effective power control of permanent magnet synchronous generator-based wind energy conversion systems. The presence of traditional encoders can increase the size, cost and complexity, but also reduce the overall system life-time and reliability. To provide a more reliable sensorless wind generation control scheme and eliminate the reliance on encoders, this paper presents a novel high order sliding mode observer for power control of permanent magnet synchronous generator-based wind energy conversion systems. Compared with the first order sliding mode observer, a high order sliding mode observer shows superior estimation accuracy with significantly reduced chattering effect. A three-level neutral-point-clamped space vector pulse width modulation (NPC-SVPWM) based power converter is used to reduce the voltage stress on power switching devices and produce less harmonics in the output waveforms compared with a traditional two-level inverter. Computer simulation results have shown the superior performance of the purposed high order sliding mode observer in wind turbine power control applications.
Liddle, Marshall. "Towards a better wind power map of Nevada." abstract and full text PDF (free order & download UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1453599.
Full textChahwan, John A. "Vanadium-redox flow and lithium-ion battery modelling and performance in wind energy applications." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100223.
Full textMcCartney, Shauna. "The simulation and control of a grid-connected wind energy conversion system." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4680.
Full textID: 029050708; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.E.E.)--University of Central Florida, 2010.; Includes bibliographical references (p. 66-70).
M.S.E.E.
Masters
Department of Electrical Engineering and Computer Science
Engineering and Computer Science
Tamimi, Ala. "Voltage stability limits for weak power systems with high wind penetration." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/13100.
Full textDepartment of Electrical and Computer Engineering
Anil Pahwa
Shelli K. Starrett
Analysis of power system voltage stability has practical value in increasing wind penetration levels. As wind penetration levels increase in power systems, voltage stability challenges arise due to locating wind resources far away from load centers. This dissertation presents several different voltage stability methods for sizing new wind farms. Power system wind penetration levels depend on the available voltage stability margins (VSMs) of the existing power system and system load characteristics. Three new iterative methods have been developed to maximize wind penetration level in weak power systems based on systems’ VSMs. The first two methods use an iterative approach for increasing the size of each wind farm until reaching the collapse point. Wind farms with less negative impact on system VSMs are sized larger than others. A third wind farm sizing method has been developed using modal analysis in conjunction with the traditional voltage stability method (Q-V method). Wind farms are placed at buses in the power system which have the lowest negative impact on voltage instability modes (strong wind injection buses). By placing the wind farms at the strongest wind injection buses, higher amounts of wind power can be injected into the power system. To further increase wind penetration in weak power systems, two additional techniques are introduced and applied to the western Kansas power system. The first technique uses modes of voltage instability to place voltage support equipment like static var compensators at locations in the power system where they provide the needed reactive power support for increasing levels of wind penetration. The second technique uses the fact that wind patterns at a wind farm site may rarely allow the wind farm to produce its maximum capacity during the peak loading hours. Wind farm maximum sizes can be increased above their maximum voltage stable size limit without driving the power system into becoming voltage unstable. Preventing voltage collapse for the additional increases in wind farm sizes is accomplished by disconnecting some wind turbines inside the wind farm during critical times to reduce its power output to a voltage stable level.
Agabus, Hannes. "Large-scale integration of wind energy into the power system considering the uncertainty information = Elektrituulikute integreerimine energiasüsteemi arvestades informatsiooni mittetäielikkust /." Tallinn : TUT Press, 2009. http://digi.lib.ttu.ee/i/?446.
Full textPalmer, Nathan Reed. "Smart Composites evaluation of embedded sensors in composite materials /." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/palmer/PalmerN0809.pdf.
Full textCurrin, Hugh D. "A dynamic prescribed vortex wake model for the FAST/AeroDyn wind energy conversions simulation code." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3258834.
Full textHamilton, Nicholas Michael. "Anisotropy of the Reynolds Stress Tensor in the Wakes of Counter-Rotating Wind Turbine Arrays." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/1848.
Full textKuiler, Ian Radcliffe. "Condition monitoring of squirrel cage induction generators in wind turbines." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2530.
Full textGlobally governments are faced with challenges in the energy sector which are exacerbated by uncertain financial markets and resource limitations. The over utilization of fossil fuels for electricity generation has had a profound impact on the climatic conditions on earth. Coal power stations release carbon dioxide (CO2) during the combustion process and studies show that concentrations have sharply risen in the atmosphere. Adverse environmental conditions like global warming exist as a result of high greenhouse gas (GHG) emissions in particular CO2. In 2015 Eskom constructed Sere Wind farm with a supply capability of 100 MW. Due to the lack of technical expertise and skills with regard to the new technology within Eskom, Siemens was offered a 5 year maintenance contract. Siemens also provides training on basic operation and maintenance (O&M) of the wind farm to Eskom staff. This excludes specialised training on Siemens Turbine Condition Monitoring (TCM) systems which is a critical part to develop optimum maintenance strategies. This shortage of specialised skills in the application of condition monitoring techniques within Eskom is a major concern. If the most cost effective maintenance strategies during the contract period are implemented, the long term plant health and design life of Sere wind farm will be reduced. There is a need to develop new condition monitoring techniques to complement or address the shortcomings of the existing systems. Developing these skills will increase the understanding of the technology and improve the operating and maintenance of Sere wind farm.
Todeschini, Grazia. "Wind Energy Conversion Systems based on DFIG Technology used as Active Filters: Steady-State and Transient Analysis." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-dissertations/97.
Full textBlockey, James Craig. "Feasibility in developing smart structures for use in wind turbine blades." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/blockey/BlockeyJ0808.pdf.
Full textStander, Johan Nico. "The specification of a small commercial wind energy conversion system for the South African Antarctic Research Base SANAE IV." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1583.
Full textThe sustainability and economy of the current South African National Antarctic Expedition IV (SANAE IV) base diesel-electric power system are threatened by the current high fuel prices and the environmental pollution reduction obligations. This thesis presents the potential technical, environmental and economical challenges associated with the integration of small wind energy conversion system (WECS) with the current SANAE IV diesel fuelled power system. Criteria derived from technical, environmental and economic assessments are applied in the evaluation of eight commercially available wind turbines as to determine the most technically and economically feasible candidates. Results of the coastal Dronning Maud Land and the local Vesleskarvet cold climate assessments based on long term meteorological data and field data are presented. Field experiments were performed during the 2007-2008 austral summer. These results are applied in the generation of a wind energy resource map and in the derivation of technical wind turbine evaluation criteria. The SANAE IV energy system and the electrical grid assessments performed are based on long term fuel consumption records and 2008 logged data. Assessment results led to the identification of SANAE IV specific avoidable wind turbine grid integration issues. Furthermore, electro-technical criteria derived from these results are applied in the evaluation of the eight selected wind turbines. Conceptual wind turbine integration options and operation modes are also suggested. Wind turbine micro-siting incorporating Vesleskarvet specific climatological, environmental and technical related issues are performed. Issues focusing on wind turbine visual impact, air traffic interference and the spatial Vesleskarvet wind distribution are analysed. Three potential sites suited for the deployment of a single or, in the near future, a cluster of small wind turbines are specified. Economics of the current SANAE IV power system based on the South African economy (May 2008) are analysed. The life cycle economic impact associated with the integration of a small wind turbine with the current SANAE IV power system is quantified. Results of an economic sensitivity analysis are used to predict the performance of the proposed wind-diesel power systems. All wind turbines initially considered will recover their investment costs within 20 years and will yield desirable saving as a result of diesel fuel savings, once integrated with the SANAE IV diesel fuelled power system. Finally, results of the technical and economical evaluation of the selected commercially available wind turbines indicated that the Proven 6 kWrated, Bergey 10 kWrated and Fortis 10 kWrated wind turbines are the most robust and will yield feasible savings.
Cunningham, John B. "Field Testing the Effects of Low Reynolds Number on the Power Performance of the Cal Poly Wind Power Research Center Small Wind Turbine." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2249.
Full textKanchanaharuthai, Adirak. "Small-Signal Stability, Transient Stability and Voltage Regulation Enhancement of Power Systems with Distributed Renewable Energy Resources." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1321988036.
Full textMitchell-Colgan, Elliott James. "Improved Dynamical Analysis Tools for DFIG Wind Farms via Traditional and Koopman Linearizations." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/94134.
Full textDoctor of Philosophy
The electric power system is designed to economically and reliably transmit electricity to homes, industry, and businesses. The economic impact of the electric grid was demonstrated by the 2003 blackout’s visible impact in the graph of the yearly gross domestic product of the United States. However, because the number of customers is so large and economies of scale are leveraged to keep electricity prices low, utilities are strongly interconnected. Performing comprehensive engineering analyses to ensure reliable operation is still impossible. Instead, heuristics and safety factors are incorporated into planning processes to continually meet demand in a way that complies with Federal regulations. As evidenced by the infrequency of blackouts in the United States, the sophisticated planning processes have up to date been relatively successful. However, the power system is constantly changing. Electrical generators based on renewable energies are a beneficial addition to the grid, but these and other technological changes like high-voltage power electronic converters also come with their own challenges. These systems as currently employed tend to have a different impact on the reliability of operation than traditional fossil fuel based generators. As the system changes, so do the engineering analyses required to ensure reliable operation. In particular, the wind energy conversion systems (WECS) negatively impact the response of the grid to disturbances in certain ways due to inherent challenges harnessing the wind as an energy sources. These negative impacts (and the advent of powerful personal computing) require an increase in the sophistication of power system models. Thus, there are competing challenges: the scale of the power system necessitates computationally efficient modeling, but the complexity of analysis required to maintain reliable operation is also increasing. The primary aim of this study is to develop models and methods for more detailed yet computationally manageable simulation. To this aim, higher order linearizations and the properties of linear systems (graph theory and linear algebra) are exploited. More specifically, this document contains three studies. In the short term planning and situational awareness context, a method is proposed to quickly check credible outages of important grid equipment. This methodology enables the inspection of a wider breadth of system conditions to ameliorate the negative impacts of the unpredictability of the wind. A linear model in the traditional sense is also developed to model any arbitrary number of wind turbines in a wind farm. This enables industry players to study the impacts wind turbine interaction on the dynamic stability of the grid in response to small disturbances. Finally, a wind farm is modeled as a large matrix to model even nonlinear behavior of wind farms. This helps industry players analyze the impact of large disturbances on the grid.
Mitchell-Colgan, Elliott. "Improved Dynamical Analysis Tools for DFIG Wind Farms via Traditional and Koopman Linearizations." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/94134.
Full textDoctor of Philosophy
The electric power system is designed to economically and reliably transmit electricity to homes, industry, and businesses. The economic impact of the electric grid was demonstrated by the 2003 blackout’s visible impact in the graph of the yearly gross domestic product of the United States. However, because the number of customers is so large and economies of scale are leveraged to keep electricity prices low, utilities are strongly interconnected. Performing comprehensive engineering analyses to ensure reliable operation is still impossible. Instead, heuristics and safety factors are incorporated into planning processes to continually meet demand in a way that complies with Federal regulations. As evidenced by the infrequency of blackouts in the United States, the sophisticated planning processes have up to date been relatively successful. However, the power system is constantly changing. Electrical generators based on renewable energies are a beneficial addition to the grid, but these and other technological changes like high-voltage power electronic converters also come with their own challenges. These systems as currently employed tend to have a different impact on the reliability of operation than traditional fossil fuel based generators. As the system changes, so do the engineering analyses required to ensure reliable operation. In particular, the wind energy conversion systems (WECS) negatively impact the response of the grid to disturbances in certain ways due to inherent challenges harnessing the wind as an energy sources. These negative impacts (and the advent of powerful personal computing) require an increase in the sophistication of power system models. Thus, there are competing challenges: the scale of the power system necessitates computationally efficient modeling, but the complexity of analysis required to maintain reliable operation is also increasing. The primary aim of this study is to develop models and methods for more detailed yet computationally manageable simulation. To this aim, higher order linearizations and the properties of linear systems (graph theory and linear algebra) are exploited. More specifically, this document contains three studies. In the short term planning and situational awareness context, a method is proposed to quickly check credible outages of important grid equipment. This methodology enables the inspection of a wider breadth of system conditions to ameliorate the negative impacts of the unpredictability of the wind. A linear model in the traditional sense is also developed to model any arbitrary number of wind turbines in a wind farm. This enables industry players to study the impacts wind turbine interaction on the dynamic stability of the grid in response to small disturbances. Finally, a wind farm is modeled as a large matrix to model even nonlinear behavior of wind farms. This helps industry players analyze the impact of large disturbances on the grid.
Schooley, David C. "Unit commitment and system reliability in electric utility systems with independent wind and solar generation." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/12917.
Full textFischer, Felix Friedrich. "The regulation of Section 17 (2a) of the German Energy Economy Act against the background of current developments of the German and European offshore wind industry." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/5750.
Full textENGLISH ABSTRACT: With the introduction of Section 17 of the EnWG (German Energy Economy Act), the legislator created a new situation for the complex relationships in the German offshore wind industry. The transmission system operators are now obliged not only to provide the connection for offshore wind farms, but also to reimburse the developers of such plants for the costs they incurred in the course of planning the cable connection between the wind farm and the onshore grid. Forecasts had predicted that by 2007 numerous offshore wind farms would be operational. But no development company in the entire sector had moved beyond the planning phase. However, the rapid development of the offshore wind industry is important in order to achieve the German goal to generate 20% of all energy from renewable energy sources by 2020 and thus contribute to the prevention of grave climate changes. It is also important for the domestic labour market and the initiation of further exports of energy technologies. Early domestic growth will eventually payoff as offshore wind energy is implemented by more countries, which will then rely on the experience of German companies. Under these circumstances, Section 17 (2a) S.3 of the EnWG induces a positive impulse for offshore development. Under the financial constraints that dampened the expectations of developers of offshore wind farms, the suggested reimbursement will offer welcome relief. However a broad interpretation of Section 17 (2a) S.3 of the EnWG must be applied in order to reach the goal of actually enhancing offshore development, as is the legislator's intent. Such a broad interpretation of the reimbursement claim will lead to rapid implementation of the new law, as this will be in the interest of the developers and transmission system operators. The developers will have a large interest in beginning with the actual construction of the wind farm, and the transmission system operators will need to proceed with the planning of the cable connection. Even though improvements remain necessary the introduction of Section 17 (2a) S.3 EnWG can be considered a success.
AFRIKAANSE OPSOMMING: Met die inwerkingstelling van afdeling 17 van die EnGW (Duitse Energie Ekonomie Wet), het die regering 'n nuwe situasie geskep vir die komplekse verhouding in die Duitse see-gebonde wind-energie industrie. Die transmissie stelsel operateurs word nou verplig om nie net die verbinding met die wind-plaas te verskaf nie, maar moet ook die ontwikkelaar van die aanleg vergoed vir enige kostes wat hulle aangegaan het met die beplanning van die verbinding tussen die windplaas en die elektrisiteits-netwerk. Vooruitskattings het voorspel dat verskeie see-gebonde windplase operasioneel sou wees teen 2007. Geen ontwikkelingsmaatskappy het egter al tot dusver verder as die beplanningstadium gevorder nie. Desnieteenstaande, die spoedige ontwikkeling van die see-gebonde wind industrie is onontbeerlik in die Duitse mikpunt om 20% van energiebehoeftes op te wek vanuit hernubare bronne teen 2020 en om dus klimaatsverandering teen te werk. Dit is ook belangrik vir werkskepping in Duitsland en vir die uitvoer van energie tegnologie. Spoedige groei in die industrie sal uiteindelik dividende lewer soos seegebonde wind-energie deur ander lande ontwikkel word en gevolglik op Duitse ervaring moet staatmaak. Onder hierdie omstandighede het afdeling 17 (2a) 5.3 van die EnGW 'n positiewe effek op seegebonde ontwikkeling. As gevolg van die dempende effek wat finansiele beperkinge het op die verwagtinge van ontwikkelaars sal die terugbetalings welkome verligting bied. Dit is egter nodig om 'n bree interpretasie van afdeling 17 (2a) 5.3 van die EnGW te gebruik om die mikpunt van werklike bevordering van seegebonde ontwikkeling te bewerkstellig soos die wetgewer beoog. So 'n bree interpretasie sal lei tot spoedige implimentasie van die nuwe wet omdat dit in die belang van ontwikkelaars en transmissie-netwerk eienaars sal wees. Die ontwikkelaars sal baat daarby om spoedig met ontwikkeling te begin, terwyl die netwerk operateurs vordering sal moet maak met die beplanning van die kabel-verbinding. Ten spyte daarvan dat verdere verbeteringe nodig is kan die inwerkingstelling van afdeling 17 (2a) 5.3 van die EnGW as 'n sukses gereken word.
Jarvis, Christina M. "An evaluation of the wildlife impacts of offshore wind development relative to fossil fuel power production." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 0.67 Mb., 123 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1430770.
Full textLiang, Jiaqi. "Wind energy and power system interconnection, control, and operation for high penetration of wind power." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47570.
Full textEsmaili, Gholamreza. "Application of advanced power electronics in renewable energy sources and hybrid generating systems." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1141850833.
Full textKerley, Ross. "Small-scale hybrid alternative energy maximizer for wind turbines and photovoltaic panels." Honors in the Major Thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/457.
Full textB.S.
Bachelors
Engineering and Computer Science
Jones, Gavin Wesley. "Distribution system operation and planning in the presence of distributed generation technology." Diss., Rolla, Mo. : University of Missouri-Rolla, 2007. http://scholarsmine.umr.edu/thesis/pdf/Jones_09007dcc803b193d.pdf.
Full textVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 16, 2007) Includes bibliographical references (p. 71-74).
DeLucia, Dominic. "A Parametric Study on Power Variation for Model Wind Turbine Arrays." PDXScholar, 2013. http://pdxscholar.library.pdx.edu/open_access_etds/1120.
Full textGogas, Kyriakos. "Design of a robust speed and position sensorless decoupled P-Q controlled doubly-fed induction generator for variable-speed wind energy applications." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99762.
Full textThe objectives of this thesis are to implement a decoupled P-Q control of a DFIG that does not rely on mechanical sensors and to design a speed and position sensorless algorithm that is robust to variations of the values of the machine parameters. The sensorless DFIG control algorithm presented in this thesis is based on a modified phasedlock loop with an improved positioning algorithm. With the measured stator voltages, stator and rotor currents, the speed and position of the DFIG are estimated. The speed is estimated independent of machine parameters, which results in a significant improvement in speed control robustness to parameter variations. In addition, the algorithm avoids using differentiation, which significantly improves its immunity to noise and does not require the measurement of the rotor voltages. Also, it is shown that the positioning algorithm has an improved operation in generator mode. Although the accuracy of the positioning algorithm is depended on machine parameters; it is shown with the designed controller that the P-Q decoupled control is robust to changes of machine parameters. Theoretical and simulation results are validated on an experimental setup.
Caballero, Diaz Luis. "Contributions to the design and operation of a multilevel-active-clamped Dc-Ac grid- connected power converter for wind energy conversion systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/454979.
Full textLa demanda de energía eólica ha incrementado considerablemente durante las últimas décadas. Con el objetivo de satisfacer esta gran demanda, los sistemas de conversión de energía eólica (WECS) son diseñados para operar con mayores niveles de potencia. Actualmente, la topología de convertidor de potencia más atractiva en los WECS comerciales es el convertidor de dos niveles operando en fuente de tensión y configuración back to back (2L-B2B). Sin embargo, esta topología podría tener dificultades para ofrecer un comportamiento aceptable en los WECS de mayor potencia con los dispositivos actuales, incluso aunque su coste sea reducido. En cambio, los convertidores multinivel pueden incrementar la potencia sin necesidad de incrementar la corriente ni el voltaje de bloqueo de los dispositivos, permitiendo conseguir un diseño adecuado para los WECS de mayor potencia usando los dispositivos actuales. Dentro de los convertidores multinivel, la topología 3L-NPC tiene una gran aceptación en el mercado eólico, siendo una solución común en los WECS de mayor potencia. Sin embargo, su gran inconveniente es que la potencia pérdida es distribuida de una manera desequilibrada entre los dispositivos. De este modo, la potencia de salida se ve limitada por el comportamiento térmico del dispositivo más estresado a nivel térmico, el cual depende del punto de operación. De esta manera, la topología 3L-ANPC fue propuesta con el objetivo de mejorar la distribución de las pérdidas del convertidor entre los dispositivos. El convertidor 3L-ANPC proporciona un camino totalmente controlable para la conexión del punto neutro. Por lo tanto, el convertidor 3LANPC es capaz de ofrecer cierto grado de libertad para distribuir la potencia pérdida entre los dispositivos. Como consecuencia, y comparado con el convertidor 3L-NPC, el comportamiento térmico es mucho más equilibrado y la potencia de salida puede ser incrementada. Sin embargo, todavía hay margen de mejora para alcanzar mejores prestaciones en el comportamiento del convertidor 3L-ANPC. A raíz de la argumentación anterior, la tesis propuesta define nuevas guías de diseño para el convertidor 3L-ANPC cc-ca conectado a la red. Las guías de diseño están focalizadas en mejorar la fiabilidad y el comportamiento eléctrico del convertidor, respetando la tendencia del estado del arte actual para definir una solución factible para la próxima generación de WECS. Las contribuciones de la tesis están basadas en definir una configuración de dispositivos mejorada y una secuencia de conmutación novedosa, evitando concentrar grandes pérdidas de conducción y de conmutación en un mismo dispositivo. Las contribuciones permiten seleccionar el dispositivo más adecuado para cada posición del convertidor, consiguiendo una mejor eficiencia y una distribución de pérdidas y comportamiento térmico más equilibrado. Además, también permiten operar con potencias más elevadas, y mejorar la fiabilidad del convertidor.
Yin, Hang [Verfasser], Sibylle [Akademischer Betreuer] Dieckerhoff, Sibylle [Gutachter] Dieckerhoff, Uwe [Gutachter] Schäfer, and Lijun [Gutachter] Cai. "Grid current control methods for MV wind energy conversion systems / Hang Yin ; Gutachter: Sibylle Dieckerhoff, Uwe Schäfer, Lijun Cai ; Betreuer: Sibylle Dieckerhoff." Berlin : Technische Universität Berlin, 2019. http://d-nb.info/1193570565/34.
Full textYunus, A. M. Shiddiq. "Application of SMES Unit to improve the performance of doubly fed induction generator based WECS." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/1450.
Full textJaramillo, López Fernando. "Control and Model Identification on Renewable Energy Systems." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112240.
Full textThe compromising situation of the environment due to pollution, and the high costs of the fossil fuels have originated new policies and regulations that have stimulating the interest on alternative energy sources. Many countries around the world have increased in an important way the penetration of these energy sources. Two of the most widely used renewable energy systems are the wind turbines systems (WTS) and the photovoltaic systems (PVS). WTS convert wind energy in electric energy by means of an electromechanical process and PVS convert solar energy directly in electric energy by means of a semiconductive process. These systems show many challenges that need to be solved in order to gain ground to the traditional energy systems. One of these challenges is increase the overall system efficiency by controlling the power conditioning elements. In order to achieve this, is necessary to better understand the dynamic behavior of these systems and develop new mathematical models and new control techniques. These techniques often require system information that is not possible ---or is too expensive--- measure. In order to solve this problem, is necessary to create algorithms that are able to estimate this information, however, this is not an easy task, because the signals of the energy sources in WTS and PVS (i.e., wind speed, irradiance, temperature) enter in the mathematical models in a nonlinear relation. These algorithms have to be able to estimate these signals ---or the signals that depend on them--- with good precision. Also, it is necessary to design control laws that operate the systems at their maximum power point. In this work, we propose novel estimation algorithms and control laws that are related with the increase of the energetic efficiency in WTS and PVS. Previous works related with estimation of the mentioned signals considered them as constants. In this thesis, the proposed estimation algorithms consider the time-varying condition of these signals. In all of these novel propositions, uniform asymptotic stability is proved using Lyapunov theories. The control laws are derived using the overall nonlinear models of the systems. In addition, some of these solutions are extended to the general case, which can be used on a large-class of nonlinear systems. The first one, is a novel parameter estimator for nonlinear systems. It allows to estimate time-varying nonlinear parameters. The second general proposition is a framework for a class of adaptive nonlinear systems that allows to compensate for uncertainties and perturbations that satisfy the matching condition
van, Niekerk Melanie. "Understanding aquatic carbon loss from upland catchments in south west Scotland during land use change from commercial forest to wind farm." Thesis, University of Stirling, 2012. http://hdl.handle.net/1893/13064.
Full textMorales, Ana. "Impact of decentralized power on power systems." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210841.
Full textIn order to guard the system security and quality of supply and retain acceptable levels, a maximum allowed wind power penetration (wind margin) is normally assumed by the operators. Very conservative methods are used to assess the impact of wind power and the consequences turn to under-exploitation of the wind power potential in a given region. This thesis presents the study of actual methods of wind power assessment, divided into three parts:
1. Part I: Impact on the Security of Power Systems
2. Part II: Impact on the Power Quality
3. Part III: Impact on the Dynamic Security of Power Systems
Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished
Wang, Tian Xiang. "Study of the integration method on the control of wind power system." Thesis, University of Macau, 2009. http://umaclib3.umac.mo/record=b2144085.
Full textLucas, Marlos DiÃgenes. "ContribuiÃÃes para o estudo de aerogeradores em operaÃÃo coordenada com STATCOM." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16123.
Full textO constante aumento da demanda energÃtica de um paÃs à sempre alvo de preocupaÃÃo para os operadores de sistemas. Isto implica diretamente no aumento do grau de exigÃncia dos novos procedimentos de rede. Dentre outros tipos de exigÃncia, o ONS (Operador Nacional do Sistema ElÃtrico), solicita, por exemplo que a tensÃo contratada seja controlada pelo solicitante em nÃveis entre 0,95 e 1,05 p.u. (230kV). Quando existem no sistema, centrais eÃlicas de geraÃÃo baseados em mÃquina de induÃÃo duplamente alimentada, esta preocupaÃÃo à ainda maior. Isto porque este tipo de mÃquina, possui seu estator conectado diretamente à rede, tendo, por sua vez, maior sensibilidade a oscilaÃÃes de tensÃo. Sabendo disto, nos Ãltimos anos a eletrÃnica de potÃncia tem estado cada vez mais presente no setor elÃtrico, a exemplo do Static Synchronous Compensator, o STATCOM, que atravÃs do gerenciamento da potÃncia reativa, pode melhorar e muito a ponto de atà anular efeitos causados por oscilaÃÃo de tensÃo. Visando uma aplicaÃÃo semelhante a esta, este trabalho investiga a operaÃÃo conjunta entre o STATCOM e centrais eÃlicas no que diz respeito ao suporte à tensÃo do sistema no qual esta incorporaÃÃo à conectada. Decidiu-se basear o estudo num cenÃrio existente no nordeste brasileiro pois desta forma, à possÃvel ter noÃÃo dos reais efeitos que um STATCOM pode trazer, positivamente, ao sistema. Este trabalho apresenta uma tÃcnica para dimensionamento do STATCOM bem como discussÃes gerais sobre possÃveis desvantagens desta aplicaÃÃo. AlÃm disso, à utilizado dois softwares para elaboraÃÃo dos resultados: MatLab, que atravÃs de scripts calcula todos pontos de interesse para a anÃlise; e ANAREDE, para verificaÃÃo e comparaÃÃo dos resultados obtidos atravÃs do primeiro software. E ainda, este estudo mostra que o script desenvolvido à capaz de designar resultados que se aproximam bastante das respostas do ANAREDE, que sÃo conferidos atravÃs do comportamento do erro das respostas de ambos os programas. Por fim, com objetivo de mostrar o funcionamento dos modos de operaÃÃo do STATCOM conectado ao sistema, sÃo explicitados resultados retirados pelo software PSCAD para um cenÃrio diferente do estudado.
The constant increase in energy demand of a country is always the target of concern for system operators. This implies directly in increasing degree of requirement of the new grid procedures. Among other types of requirement, the ONS (National Electricity System Operator), requests, for example that the tension is controlled by contractor requestor is always controlled between 0.95 and 1.05 p.u.. When there are in the system, wind generation plants based on doubly fed induction machine, this concern is even greater. This is because this type of machine, has its stator connected directly to the network, and in turn more sensitive to voltage fluctuations. Knowing this, in recent years the power electronics is being increasingly present in the electricity sector to mitigate these failures, the example of Static Synchronous Compensator, the STATCOM, that through the management of reactive power, can improve and the point until oscillation effects of annular tension. Targeting an application similar to this, this work brings an idea of STATCOM operating in conjunction with wind farms on serviceability of the desired bar voltage. It was decided to base the study on existing scenario in northeastern Brazil because this way, you can get a sense of the real effects of a STATCOM can bring, positively, to the system. This paper presents a technique for STATCOM sizing as well as general discussions about possible disadvantages of this application. In addition, is used two softwares for preparation of results: MatLab, which through scripts calculates all points of interest for analysis; and ANAREDE, for verification and comparison of the results obtained through the first software .
Hung, Duong Quoc. "Smart integration of distributed renewable generation and battery energy storage." Thesis, The University of Queensland, 2014. https://espace.library.uq.edu.au/view/UQ:342027.
Full textLa, Seta Piergiovanni. "Regelungstechnische Konzepte zur Integration alternativer Erzeugungsanlagen in lokale Energieversorgungsnetze unter besonderer Berücksichtigung der Systemstabilität." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1195727596802-34238.
Full textSilva, Carlos Elmano de Alencar e. "Estudo e desenvolvimento experimental de um sistema eÃlico interligado a rede elÃtrica." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7458.
Full textFundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico
Este trabalho apresenta o estudo e desenvolvimento de um sistema eletrÃnico de aproveitamento de energia eÃlica a partir de um gerador sÃncrono de Ãmà permanente conectado a uma turbina de vento. O sistema opera com velocidade variÃvel, permitindo o mÃximo aproveitamento da energia cinÃtica incidente na turbina de vento. Essa energia cinÃtica à convertida em energia elÃtrica pelo gerador sÃncrono de Ãmà permanente e depois de totalmente condicionada, injetada na rede elÃtrica convencional. Esse condicionamento à feito por um sistema eletrÃnico objeto de estudo e desenvolvimento deste trabalho, o qual consiste em um retificador trifÃsico interligado a um inversor monofÃsico em ponte completa com saÃda em corrente. SÃo apresentadas a revisÃo bibliogrÃfica de sistemas de aproveitamento de energia eÃlica para geraÃÃo de energia elÃtrica pertinentes ao escopo do trabalho, a anÃlise do estÃgio retificador (potÃncia e controle), a anÃlise do estÃgio inversor (potÃncia e controle), uma comparaÃÃo teÃrica de rendimento entre o retificador trifÃsico proposto neste trabalho (bridgeless trifÃsico) e o retificador trifÃsico dois nÃveis, e os resultados experimentais de um protÃtipo de validaÃÃo de 5kW do sistema proposto.
This work presents the study and development of an electronic system for wind energy exploitation from a permanent magnet synchronous generator connected to a wind turbine. The system operates with variable speed, allowing maximum use of the kinetic energy incident on the wind turbine. This kinetic energy is converted into electrical energy by the permanent magnet synchronous generator and, after being fully conditioned, injected into the conventional power grid. This conditioning is done by an electronic system object of study and development of this work, which consists of a rectifier connected to a single-phase full-bridge inverter with current output. Are presented the literature review of the relevant wind energy conversion systems to the scope of work, the analysis of the rectifier stage (power and control), the analysis of the inverter stage (power and control), a efficiency theoretical comparison between the proposed rectifier (three-phase bridgeless) and the three-phase fullbridge rectifier, and the experimental results of an 5kW validation prototype of the proposed system.