Dissertations / Theses on the topic 'Converter systems'
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Patil, Sandeep. "Analysis and Loss Estimation of Different Multilevel DC-DC Converter Modulesand Different Proposed Multilevel DC-DC Converter Systems." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1396628125.
Full textPrice, Alexandra A. E. "New perspectives on wave energy converter control." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3109.
Full textGow, John A. "Modelling, simulation and control of photovoltaic converter systems." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/6871.
Full textBorisov, Konstantin A. "Multifunctional voltage source converter for shipboard power systems." Diss., Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-06042007-142951.
Full textLi, Quan, and q. li@cqu edu au. "DEVELOPMENT OF HIGH FREQUENCY POWER CONVERSION TECHNOLOGIES FOR GRID INTERACTIVE PV SYSTEMS." Central Queensland University. School of Advanced Technologies & Processes, 2002. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20020807.152750.
Full textLee, Choong Hoon. "Design of high speed low voltage data converters for UWB communication systems." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3798.
Full textJames, Peter Andrew. "Health monitoring of IGBTs in automotive power converter systems." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/health-monitoring-of-igbts-in-automotive-power-converter-systems(224a6b3c-a1f0-4379-9ff7-eb5603f8deb9).html.
Full textTrilla, 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.
Mino, Kazuaki. "Novel hybrid unidirectional three-phase AC-DC converter systems /." [S.l.] : [s.n.], 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18185.
Full textChristoforidis, George P. "Harmonic analysis of power systems connected to converter substations." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/14994.
Full textDALAL, MANISH A. "High Voltage DC Converter Systems Modeling, Simulation and Analysis." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1248966912.
Full textBidoggia, Benoit. "Fuel cell and power converter systems : model and design." Thesis, Tours, 2009. http://www.theses.fr/2009TOUR4027/document.
Full textFuel cells are devices in which a fuel’s chemical potential energy is directly converted into electrical energy. They are almost always coupled to a power converter and the ensemble is here called “fuel cell system.” The behaviour of such systems, the interactions between their components,and their responses to external stimulations have been analysed, studied and measured. For this purpose, a complete fuel cell system has been modelled. Sizing criteria for cases where neither the fuel cell nor the power converter are a priori known have been identified, and a prototype has been sized and built. Other interesting correlative aspects have also been developed and studied, like the operation of the power converter on the border between the discontinuousand continuous conduction modes, and its control with a variable switching frequency. Experimental and simulation results for the system and for the different parts that compose it are presented
Le celle a combustibile sono dei dispositivi in cui l’energia chimica potenziale di un combustibile è direttamente convertita in energia elettrica. Quasi sempre le celle a combustibile sono accoppiate a un convertitore di potenza e l’insieme è qui chiamato «sistema a celle a combustibile». Il comportamento di questi sistemi, le interazioni tra i diversi componenti, nonché le loro risposte a stimoli esterni sono stati analizzati, studiati e misurati.A tal fine, un sistema completo a celle a combustibile è stato modellizzato. Sono stati identificati dei criteri di dimensionamento per casi in cui né la cella a combustibile, né il convertitore sono noti a priori, e un prototipo è stato dimensionato e realizzato. Altri interessantiaspetti correlatisonostati sviluppatie studiati,comeil funzionamento del convertitore di potenza al limite fra modo di conduzione discontinuo e continuo, e il suo controllo a frequenza di commutazione variabile. Risultati sperimentali e di simulazione per il sistema e le diverse parti che lo compongono sono presentati
Zhang, Xin. "Impedance control and stability of DC/DC converter systems." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13951/.
Full textFrancisco, Venustiano Canales Abarca. "Novel DC/DC Converters For High-Power Distributed Power Systems." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/28612.
Full textPh. D.
Ramasamy, Thaiyal Naayagi. "Bidirectional DC-DC converter for aircraft electric energy storage systems." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/bidirectional-dcdc-converter-for-aircraft-electric-energy-storage-systems(34423ae1-ebfb-48bd-a66d-fd03b45615e7).html.
Full textDu, Plessis Jacques. "A hydraulic wave energy converter." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/19950.
Full textENGLISH 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 of the concerns. Constant changes in wave heights, lengths and directions as well as high energy levels and large forces during storm conditions often lead to difficulties in keeping the complexity of the device down, avoiding over-dimensioning and reaching high capacity factors. The point absorber device developed as part of this research is based on an innovation addressing the abovementioned issues. An approach is followed whereby standard "offthe- shelf" components of a proven hydraulics technology are used. The size of the device is furthermore adaptable to different wave climates, and the need for a control system is not necessary if the design parameters are chosen correctly. These characteristics enable low complexity of the device, excellent survivability and an exceptionally high capacity factor. This may lead to low capital as well as low operationand maintenance costs. In this paper the working principle of this concept is presented to illustrate how it utilises the available wave energy in oceans. The results obtained from theoretical tests correlate well with the experimental results, and it is proven that the device has the ability to achieve high capacity factors. As the device makes use of existing, "off-the-shelf" components, cost-efficient energy conversion is therefore made feasible through this research.
AFRIKAANSE OPSOMMING: As ’n hernubare/ herwinbare energiebron bied golfenergie die potensiaal om by te dra tot die bevrediging van die stygende globale energie-navraag. In spesifiek Suid-Afrika kan die oorvloed van beskikbare golfenergie aan die Suid-Weskus van die land gebruik word om aan die land se energiebehoeftes te voldoen. Betroubaarheid en oorlewing in erge weerstoestande, koste-effektiwiteit en die behaal van hoë kapasiteitsfaktore is beduidende struikelblokke wat oorkom moet word in die poging om ’n golfenergie-omsetter wat kommersieël vervaardig kan word, te ontwikkel. Daarby dra voortdurende veranderings in golfhoogtes, -lengtes en -rigtings sowel as hoë energievlakke en groot kragte tydens storms by to die feit dat dit moeilik is om die kompleksiteit van die stelsel laag te hou. Dit terwyl daar voorkom moet word dat die toestel oorontwerp en verhoed word dat hoë kapsiteitsfaktore bereik word. Die puntabsorbeerder-toestel wat in hierdie navorsing ontwikkel is, bestaan uit ’n ontwerp wat spesifiek ontwikkel is om die bogenoemde probleme aanspreek. ’n Unieke benadering is gevolg waardeur standaard, maklik-bekombare komponente gebruik is en die komponent-groottes ook aangepas kan word volgens golfgroottes. Indien die ontwerpsdimensies akkuraat gekies word, is die moontlikheid verder goed dat ’n beheerstelsel nie geïmplementeer hoef te word nie. Hierdie eienskappe verseker lae stelselkompleksiteit, uitstekende oorlewingsvermoë en ’n uitstaande kapasiteitsfaktor. Lae kapitaal- sowel as onderhoudskostes is dus moontlik. Die doel van hierdie dokument is om die werking van die konsep voor te stel en teoreties sowel as prakties te evalueer. Die resultate van teoretiese toetse stem goed ooreen met eksperimentele resultate, en dit is duidelik dat die toestel hoë kapasiteitsfaktore kan behaal. Aangesien die toestel verder gebruik maak van bestaande komponente wat alledaags beskikbaar is, word die koste-effektiewe omsetting van golfenergie dus moontlik gemaak deur hierdie navorsing.
Yang, Xiaoguang Miu Karen Nan. "Unbalanced power converter modeling for AC/DC power distribution systems /." Philadelphia, Pa. : Drexel University, 2006. http://hdl.handle.net/1860/1231.
Full textDaryabak, Mehdi. "Modeling line-commutated converter HVDC transmission systems using dynamic phasors." IEEE, 2013. http://hdl.handle.net/1993/31632.
Full textOctober 2016
Raju, N. Ravisekhar. "A decoupled converter topology for active compensation of power systems /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/5847.
Full textRocha, Antonia Fernandes da. "Study of a DC-DC step-up converter with swiched capacitor for LEDs applied to photovoltaic systems." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15889.
Full textWith global need to reduce energy consumption, the search for more efficient technologies has become the focus of many studies. Among these technologies, it can mention the photovoltaic solar energy and LEDs, which have shown an expansion in recent decades. Photovoltaic generation is shown as an attractive energy source because it is renewable and its raw material is practically inexhaustible. While LEDs have a promising advance in lighting and is used in several applications. To integrate these technologies, this paper proposes the study of a DC-DC step-up switched-capacitor (SC) converter for LEDs applied to photovoltaic stand-alone systems. The proposed circuit differs from other topologies SC to insert an inductor in series with the input source, which can operate in discontinuous conduction mode (DCM), reducing losses switching, or continuous conduction mode (CCM), allowing the reduction of conduction losses in the circuit. The converter is driven by the frequency modulation, which is obtained as a function of input voltage. For this reason, the current in the LEDs can be stabilized without the need for sensor or feedback. The prototype developed in the laboratory was designed for a lamp of 54 W and operating at high frequency (up to 165 kHz), allowing the reduction of the circuit volume. Experimental results of the circuit in DCM and CCM show that the converter has a high yield, validating the proposal.
Tendo em vista a tendÃncia da reduÃÃo do consumo de energia no mundo, a busca por tecnologias mais eficientes tem se tornado o foco de muitos estudos. Dentre estas tecnologias, pode-se citar a energia solar fotovoltaica e os LEDs, que vem apresentando uma expansÃo nas ultimas dÃcadas. A geraÃÃo fotovoltaica se mostra como uma atrativa fonte de energia, por ser renovÃvel e sua matÃria-prima ser praticamente inesgotÃvel. Enquanto os LEDs apresentam um avanÃo promissor na iluminaÃÃo, sendo utilizado nas mais diversas aplicaÃÃes. Visando a integraÃÃo destas tecnologias, este trabalho propÃe o estudo de um conversor CC-CC elevador com capacitor comutado (Switched Capacitor - SC) para LEDs, aplicado a sistemas fotovoltaicos autÃnomos. O circuito proposto se difere de outras topologias SC por inserir um indutor em sÃrie com a fonte de entrada, o qual pode operar no modo de conduÃÃo descontÃnua (MCD), reduzindo as perdas por comutaÃÃo, ou no modo de conduÃÃo contÃnua (MCC), possibilitando a reduÃÃo das perdas por conduÃÃo do circuito. O conversor à acionado atravÃs da modulaÃÃo por frequÃncia, a qual à obtida em funÃÃo da tensÃo de entrada. Por este motivo, a corrente nos LEDs pode ser estabilizada sem a necessidade de sensores ou de realimentaÃÃo. O protÃtipo desenvolvido em laboratÃrio foi projetado para uma luminÃria de 54 W e operando em alta frequÃncia (atà 165 kHz), possibilitando a reduÃÃo do volume do circuito. Os resultados experimentais obtidos do circuito MCD e MCC sÃo analisados e validam a proposta, mostrando que o conversor apresenta rendimento elevado
Bai, Yujie. "Evaluation of the Current-Fed CLLC DC/DC Converters for Battery and Super-Capacitor Based Energy Storage Systems Used in Electrified Transportation." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami157538965174651.
Full textBhattacharya, Subroto. "Simulation of transient phenomena in high voltage direct-current converter systems." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26959.
Full textApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Wang, C. J. "The Lexical Token Converter : Hardware support for Large Knowledge Based Systems." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383888.
Full textZhao, Xiaodong. "Advanced control of voltage source converter based multi-terminal HVDC systems." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.676499.
Full textZhang, Richard S. "High Performance Power Converter Systems for Nonlinear and Unbalanced Load/Source." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/29314.
Full textPh. D.
Digby, John William. "Construction of an integrated down-converter for operation at 200 GHz." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285655.
Full textSantos, Kristian Pessoa dos. "Voltage impulse generator using a cascaded boost converter for the inspection of grounding systems." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13994.
Full textThis paper presents the study and development of a voltage impulse generator using a cascaded boost converter topology operating in Discontinuous Conduction Mode (DCM) which will be used for the inspection of grounding systems used by electric power companies. The output voltage of the converter is applied to the grounding system which behaves as a load. The signal applied to the ground was measured by the data acquisition system and analyzed by an intelligent algorithms software. The voltage has the characteristics of a double exponential waveform which is a mathematical model used for study of lightning. Furthermore, the impulse generator has the option to produce a square waveform output voltage. Unlike, the traditional impulse generator with spark gaps, which was disadvantages of poor lifetime and the need of external system to operating the same, the developed generator uses only semiconductor devices in its construction. A theoretical study was carried out through qualitative and quantitative analyzes moreover, the switching process and the losses in the converter components were studied. In this work was performed the design of a cascaded boost converter for evaluating grounding systems with approximated 156 W, input voltage of 110 Vac rms and an output peak voltage of approximately 880 VDC, which correspond to the sum each voltage capacitor of the boost converter, when they are connected in series. A prototype with the indicated specifications was implemented and experimentally tested in the laboratory and real conditions using four grounding systems configurations. Tests were performed considering that the grounding impedance is resistive. The obtained experimental and simulation results are used to validate the theoretical analysis and the designed converter.
Este trabalho apresenta o estudo e desenvolvimento de um gerador de impulsos de tensÃo usando a topologia de um conversor boost em cascata operando em Modo de ConduÃÃo DescontÃnua (MCD) que serà utilizado para inspeÃÃo de sistemas de aterramentos usados pelas concessionÃrias de energia elÃtrica. A tensÃo obtida na saÃda do conversor à aplicada ao sistema de aterramento que se comporta como uma carga. O sinal aplicado ao aterramento à medido pelo sistema de aquisiÃÃo de dados e analisado pelo software por algoritmos inteligentes. A tensÃo aplicada tem as caracterÃsticas de uma onda tipo dupla exponencial que à um modelo matemÃtico para estudo de descargas atmosfÃricas. AlÃm disso, o gerador poderà gerar tensÃes com caracterÃsticas de uma onda quadrada. O gerador de impulsos desenvolvido utiliza apenas dispositivos semicondutores na sua construÃÃo que apresentam as vantagens de possuir uma longa vida Ãtil, podem operar em altas frequÃncias, sÃo acionados com baixa tensÃo e possuem uma baixa queda de tensÃo ao contrÃrio dos tradicionais geradores de impulsos que utilizam os spark gaps para chaveamento que apresentam como desvantagens a baixa vida Ãtil e a necessidade de um sistema externo para funcionamento da mesma. Um estudo teÃrico foi realizado atravÃs das anÃlises qualitativa e quantitativa, alÃm das anÃlises do processo de comutaÃÃo e das perdas nos componentes do conversor. Neste trabalho foi realizado o projeto do conversor boost em cascata para inspeÃÃo de sistemas de aterramento com uma potÃncia aproximada de 156 W, tensÃo de entrada eficaz de 110 Vca e tensÃo de pico de aproximadamente 880 Vcc que corresponde à soma da tensÃo dos capacitores do conversor boost quando estÃo dispostos em sÃrie. Um protÃtipo com as especificaÃÃes indicadas foi construÃdo e testado experimentalmente em laboratÃrio e em campo utilizando quatro topologias de sistemas de aterramento. Foram realizados testes considerando que a impedÃncia de aterramento era puramente resistiva. Os resultados de simulaÃÃo e experimentais obtidos sÃo utilizados para validar a anÃlise teÃrica e o projeto realizado.
Wen, Bo. "Weight Estimation of Electronic Power Conversion Systems." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/33514.
Full text
This thesis presents a procedure to estimate weight of electronic power conversion systems, which provides an angle to evaluate different system architectures. This procedure has three steps. Step I, according to application of the system and system structure, determines the electrical and environmental specifications for each converter in the system. Step II studies the design procedures for each converter in the system and determines parameters such as the wire gauge and length of cable; the parameters of the passive components, such as inductance and capacitance; the parameters of the power switch, such as the voltage rating, current rating and loss; and parameters of the cooling system, such as the thermal resistance of the heat sink. Step III, according to the convertersâ parameters, carry out the physical design and selection of sub-components such as the inductor and heat sink to get the componentsâ weight; the sum of those componentsâ weight is the estimated system weight. This procedure has also been implemented in the form of software â system weight estimation tool. Using this software, weight of sample systems with ac dc bus and two different bus voltages have been estimated and compared.
Master of Science
Yu, Jianghui. "DC Fault Current Analysis and Control for Modular Multilevel Converters." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/78054.
Full textMaster of Science
Mai, Yuan Yen. "Current-mode DC-DC buck converter with current-voltage feedforward control /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?ECED%202006%20MAI.
Full textBarlow, Jacob L. "Hardware-in-the-Loop control of a cascaded multi-level converter." Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1193.
Full textNext-generation U.S. Navy destroyers, known as DD(X), will use electric drive motors to meet their propulsion needs instead of the traditional mechanical drives. The use of electric drive motors in naval vessels has spurred the development of high power converters. This thesis examines the feasibility of using an advanced control algorithm known as Sine-triangle Pulse Width Modulation (SPWM) in combination with a Cascaded Multi-Level Converter (CMLC) in order to meet the U.S. Navy's strict requirements. The SPWM control algorithm was designed in Simulink and experimentally tested on a CMLC previously constructed at the Naval Postgraduate School. The controller and converter successfully powered a quarter horsepower three-phase induction motor.
Ensign, United States Navy
Sarar, Stephen F. "A galvanically isolated power converter module for DC Zonal Electric Distribution Systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FSarar.pdf.
Full textThesis Advisor(s): Robert W. Ashton, Andrew A. Parker. "March 2006." Includes bibliographical references (p. 73). Also available online.
Diaz, 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.
STEPHANE, YANNICK NJIOMOUO. "3D High Frequency Modelling of Motor Converter and Cables in Propulsion Systems." Thesis, KTH, Elektroteknisk teori och konstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160637.
Full textAnvandningen av kraftomvandlare i jarnvagstraktionssystem introducerar hogfrekvens elektromagnetisk interferens (EMI) i framdrivningssystemet, vilket orsakar elektromagnetiska kompatibilitetsproblem (EMC). Dessa hogfrekvensfenomen orsakas av snabba variationer i strom och spanning under omkopplingsoperationer i kraftomvandlare. Hogfrekvensstrommarna alstrar elektromagnetiska (EM) storningar, som kan paverka funktionaliteten hos det elektriska drivsystemet. Storningar vid kraft- och ljudfrekvenser kan paverka signal- och kontrollsystemen, medan hogfrekventa strommar injiceras i kabelskarmar kan skada kablarna. For att sakerstalla kompatibiliteten mellan EMC-kraven, vad galler ledningsbundna och utsanda storningar, och specikationerna for signalsystemets infrastruktur ar det nodvandigt att utfora 3D-modellering av drivsystemet, for att redan under designfasen av framdrivningssystemet kunna forutsaga de elektromagnetiska storningarna. CST, som ar ett elektromagnetiskt analysverktyg, anvands for att skapa 3D-modellen av omriktarmodulen och kablarna. Modellen gor det mojligt att ta med de parasitiska egenskaperna hos IGBT, ledningsmoduler och motorkablar. Inverkan av olika jordningssystemen analyseras. Modellen forutsager det elektromagnetiska faltet vid olika punkter inuti omriktarmodulen och i dess narhet.
Miwa, Brett Andrew. "Hybrid construction of a 10MHz DC-DC converter for distributed power systems." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/41583.
Full textIncludes bibliographical references (leaves 204-208).
by Brett Andrew Miwa.
Elec.E.
Williams, Richard. "The use of multilevel power converter technology in aerospace starter-generator systems." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/3816/.
Full textMuhammad, Musbahu. "High gain non-isolated DC-DC converter topologies for energy conversion systems." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3665.
Full textGowaid, Islam Azmy. "DC-DC converter designs for medium and high voltage direct current systems." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27933.
Full textHao, Miao. "Space charge behaviour in thick oil pressboard insulation systems for converter transformers." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/383685/.
Full textEspinoza, Bolaños Mauricio Antonio. "Control systems for high-power medium-voltage modular multilevel converter-based drives." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/168418.
Full textHoy en día, la construcción de maquinaria y plantas industriales exigen soluciones de accionamiento con un diseño flexible y escalable. En sectores industriales como la petroquímica, la minería, la generación de energía, etc., existe una demanda de soluciones con alta eficiencia, seguridad integrada y respaldo de las compañías proveedoras. En este contexto, el Convertidor Multinivel Modular (MMC) ha aparecido como una opción prometedora para accionamientos de media tensión de alta potencia debido a sus características, como modularidad total, flexibilidad de control, niveles de media tensión, calidad de potencia y posible operación sin transformador. Por lo tanto, esta tesis discute la aplicación del MMC para accionamientos de máquinas. El modelado del MMC y sus sistemas de control asociados para esta aplicación son analizados ampliamente en este documento. Específicamente, se ha propuesto un nuevo modelado basado en coordenadas dq y su sistema correspondiente sistema de control para regular el valor instantáneo de las tensiones de los condensadores del MMC. Además, se ha propuesto la integración de los sistemas de control de la máquina y del MMC para mejorar el rendimiento general del sistema. Por ejemplo, se demostró que las corrientes circulantes requeridas durante bajas frecuencias ac se reducen al considerar la interacción de ambos sistemas de control. La efectividad de las estrategias de control propuestas se validó a través de extensos resultados experimentales, que se han publicado en dos artículos (IEEE Transactions on Industrial Electronics) y seis artículos de conferencia (indexados en la base de datos Scopus), así como contribuciones importantes en otros proyectos relacionados con el control de convertidores multinivel modulares. El prototipo utilizado se compone de 18 celdas de potencia. El sistema se controla utilizando un procesador de señales digitales y dos FPGAs. Un segundo MMC con 12 celdas de potencia también se usó para algunas pruebas, conformando una unidad Back-to-Back MMC. Se probó el rendimiento dinámico y en estado estable de las metodologías de control propuestas, considerando el arranque del MMC, cambios escalón tanto en el par y las corrientes de magnetización, rampas de velocidad, pruebas de cruce por velocidad cero, operación de rotor bloqueado, operación con flujo debilitado, diferentes condiciones de carga, manipulación de la tensión dc del MMC, etc. En todos los casos, el rendimiento alcanzado es consistente con los resultados esperados. Nowadays, machinery and plant construction are demanding drive solutions with flexible and scalable design. In industrial sectors such as petrochemical, mining, power generation, etc., there is a demand for solutions with high efficiency, integrated safety and support from the supplier companies. In this context, the Modular Multilevel Converter (MMC) has appeared as a promising option for high-power medium-voltage drives due to their characteristics, such as full modularity, control flexibility, medium-voltage levels, power quality and possible transformer-less operation. Thereby, this thesis discusses the application of the MMC as a machine drive. The modelling and control systems required for this application are extensively analysed and discussed in this document. Specifically, a novel dq-based modelling of the MMC and its associated control system has been proposed to regulate the instantaneous value of the MMC capacitor voltages. Additionally, the integration of the machine and MMC control systems has been proposed to enhance the performance of the overall system. For example, it was demonstrated that the required circulating currents during low-ac frequencies are reduced by considering the interaction of both control systems. The effectiveness of the proposed control strategies is validated through extensive experimental results, which have been published in two journal papers (IEEE Transaction on Industrial Electronics) and six conference papers (indexed in the Scopus database), as well as important contributions in other projects related to the control of modular multilevel converters. The downscaled prototype utilised is composed of 18 power cells. The system is controlled using a Digital Signal Processor and two Field Programmable Gate Arrays (FPGAs). A second MMC with 12 power cells was also used for some tests, conforming a Back-to-Back MMC-based drive. The dynamic and steady-state performance of the proposed control methodologies were tested, considering the MMC starting-up, step changes in both the torque and magnetising currents, speed-ramps, zero-speed crossing test, rotor-locked operation, flux-weakening operation, different loading conditions, manipulation of the input voltage of the MMC, etc. In all cases, the achieved performance is consistent with the expected results.
Castagno, Scott. "A cascade boost converter design, demonstration, and scaling for future high voltage power conditioning systems." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4564.
Full textThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 17, 2009) Includes bibliographical references.
Westeneng, Teus, Cubillo Adrian Tajadura, and Miguel Rodrigo De. "Conceptual design of a piston and piston rod for a new wave energy converter concept." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-65849.
Full textCho, Yongnam. "Modeling methodology of converters for HVDC systems and LFAC systems: integration and transmission of renewable energy." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49064.
Full textSomayajula, Deepak. "Control aspects of a double-input buckboost power electronic converter." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Somayajula_2009_09007dcc8070c9e2.pdf.
Full textVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 17, 2009) Includes bibliographical references (p. 67-70).
Song, Yu Jin. "Analysis and design of high frequency link power conversion systems for fuel cell power conditioning." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/2678.
Full textChileshe, C. M. "A converter compensator for power factor control in 3-phase induction machines." Thesis, Aston University, 1996. http://publications.aston.ac.uk/12244/.
Full textRaji, Atanda Kamoru. "Modelling and development of fuel cell off grid power converter system." Thesis, [S.l. : s.n.], 2008. http://dk.cput.ac.za/cgi/viewcontent.cgi?article=1039&context=td_cput.
Full textJohansson, Frank. "Implementation of a SM drive in a voltage-source converter control system with a PCSad/EMTDC simulation software interface." Thesis, University West, Department of Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-391.
Full textRashid, Tariq. "Perturbation model based analysis of a three phase PWM ac-dc power converter." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336819.
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