Дисертації з теми "Power Quality in DC"
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Ballukja, Erjon. "Power Quality Analysis in DC/DC Converters under Steady State and Transient Conditions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Знайти повний текст джерелаFarhadi, Mustafa. "Hybrid Energy Storage Implementation in DC and AC Power System for Efficiency, Power Quality and Reliability Improvements." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2471.
Повний текст джерелаNg, Fan. "Operation and DC-link voltage control of three-phase four-wire unified power quality conditioners." Thesis, University of Macau, 2007. http://umaclib3.umac.mo/record=b1677859.
Повний текст джерелаFaktor, Richard. "Kvalita napětí v DC sítích." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316940.
Повний текст джерелаLam, Chi Seng. "An adaptive low dc-voltage controlled LC coupling hybrid active power filter in three-phase four-wire power systems." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2580608.
Повний текст джерелаKukacka, Leos. "Qualité de l'énergie dans les alimentations électriques : applications dans les réseaux d'éclairage." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30011/document.
Повний текст джерелаThis dissertation thesis is concerned with temporal fluctuations of the luminous flux of LED lamps, a phenomenon referred to as flicker. Flicker is usually regarded as a disturbance due to its negative impact on human health. For lighting systems based on light emitting diodes (LED), its definition has recently been formalised in norm IEEE 1789-2015 and has been documented on devices supplied with AC voltage. AC flicker results from interactions between network impedance, voltage and current harmonics, and the AC to DC converter. DC supplies are generally obtained by switching converters. Consequently, the same perturbing factors are present on DC networks. The thesis summarises the differences between the characteristic properties of flicker under AC and DC supplies. It has been shown in the literature and also in this thesis that the key factor affecting flicker with LEDs is the design of the LED driver-a necessary part of the LED lighting systems. This thesis describes a methodology for the evaluation of the flicker sensitivity of DC supplied LED lamps and analyses how the sensitivity changes when the LED drivers are simplified and accustomed to DC supply. The thesis presents a set of measurement experiments aimed to determine the typical flicker response of LED lamps both under AC and DC supply. Further experiments were performed to reveal the impact of accustomising the driver to the DC supply (removing the diode rectifier). It was found that some lamps show better flicker immunity while other lamps show worse flicker immunity. These experiments are accompanied by LED driver simulations aiming to reproduce and explain the measurement results. The thesis further describes a measurement experiment aimed to show the typical severity of the voltage fluctuation in a low voltage DC network coupled to AC mains and its impact on the flicker. It is concluded that such a system is robust enough to filter out any perturbations coming from the AC supply, but an undesired interaction between the lamp and the supply may occur
Nami, Alireza. "A new multilevel converter configuration for high power and high quality applications." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33216/1/Alireza_Nami_Thesis.pdf.
Повний текст джерелаFernandes, Rodolfo Castanho. "Retificador trifásico de 18 pulsos com estágio CC controlado por histerese constante /." Ilha Solteira : [s.n.], 2010. http://hdl.handle.net/11449/87117.
Повний текст джерелаBanca: Carlos Alberto Canesin
Banca: Luiz Carlos Gomes de Freitas
Resumo: Este trabalho propõe um novo conversor CA-CC trifásico de múltiplos pulsos com estágios CC-CC elevadores de tensão controlados pela técnica de histerese constante. Nesta proposta não são empregados indutores de interfase. A finalidade deste conversor é a de possibilitar um barramento CC regulado para aplicações embarcadas, acionamentos elétricos e afins, sempre com preocupações relacionadas aos aspectos de Qualidade de Energia Elétrica. Assim, a proposta deve apresentar elevado fator de potência, baixa distorção harmônica total de corrente drenada da rede elétrica. Ampla revisão bibliográfica, reunindo as propostas mais recentes da literatura para conversores com mesma finalidade, é feita para que sejam estudadas as estruturas de potência, técnicas de controle, versatilidade, possibilidade de isolamento galvânico e robustez. Em seguida, é detalhada a proposta principal deste trabalho por meio da apresentação do equacionamento do autotransformador, dos estágios elevadores de tensão e da técnica de controle. Esta análise permite que sejam feitas simulações com todos os elementos do conversor CA-CC e então, se desenvolva o projeto físico dos elementos magnéticos e se escolham os componentes eletrônicos do protótipo. O número reduzido de componentes de controle e a simplicidade dos circuitos de potência são grandes atrativos da proposta discutida. Todas as informações relevantes são descritas detalhadamente e, sempre que possível, meios alternativos de solucionar problemas são também apresentados, de forma que fiquem claras as possibilidades de melhoria da técnica empregada. A operação conjunta de todos os elementos mais a técnica de controle foi validada, de maneira que se comprovou, por meio de ensaios, todos os princípios de funcionamento da proposta de conversor CA-CC. Pelos resultados experimentais, obteve-se corrente drenada... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This work proposes a new AC-DC three-phase multipulse converter with DC-DC boost stages and constant hysteresis control. The objective of this converter is to provide a reliable DC bus for on-board applications, electric motor drives and similars, always considering power quality issues. Thus, the proposal presents high power factor and low harmonic distortions in the currents from the mains. A wide revision is made on other recent proposals found in the scientific literature. Different topologies are compared considering power circuits, control techniques, isolation possibility and robustness. The second chapter presents the details on the main proposal of this work and also the mathematical equations that describe the autotransformer, boost converters and control strategy. Later, simulation results are commented and discussed and the physical design is detailed. The output filter elements, power components and control elements are specified. Experimental results including main waveforms, efficiency, voltage regulation and temperature rise are presented for the autotransformer. The boost stages are also tested and its results are discussed. Finally, the proposed AC-DC converter is tested and the control technique applied to the power stage is validated
Mestre
Boulanger, Isabelle. "Lillgrund Wind Farm Modelling and Reactive Power Control." Thesis, KTH, Elektriska energisystem, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119256.
Повний текст джерелаFernandes, Rodolfo Castanho [UNESP]. "Retificador trifásico de 18 pulsos com estágio CC controlado por histerese constante." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/87117.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este trabalho propõe um novo conversor CA-CC trifásico de múltiplos pulsos com estágios CC-CC elevadores de tensão controlados pela técnica de histerese constante. Nesta proposta não são empregados indutores de interfase. A finalidade deste conversor é a de possibilitar um barramento CC regulado para aplicações embarcadas, acionamentos elétricos e afins, sempre com preocupações relacionadas aos aspectos de Qualidade de Energia Elétrica. Assim, a proposta deve apresentar elevado fator de potência, baixa distorção harmônica total de corrente drenada da rede elétrica. Ampla revisão bibliográfica, reunindo as propostas mais recentes da literatura para conversores com mesma finalidade, é feita para que sejam estudadas as estruturas de potência, técnicas de controle, versatilidade, possibilidade de isolamento galvânico e robustez. Em seguida, é detalhada a proposta principal deste trabalho por meio da apresentação do equacionamento do autotransformador, dos estágios elevadores de tensão e da técnica de controle. Esta análise permite que sejam feitas simulações com todos os elementos do conversor CA-CC e então, se desenvolva o projeto físico dos elementos magnéticos e se escolham os componentes eletrônicos do protótipo. O número reduzido de componentes de controle e a simplicidade dos circuitos de potência são grandes atrativos da proposta discutida. Todas as informações relevantes são descritas detalhadamente e, sempre que possível, meios alternativos de solucionar problemas são também apresentados, de forma que fiquem claras as possibilidades de melhoria da técnica empregada. A operação conjunta de todos os elementos mais a técnica de controle foi validada, de maneira que se comprovou, por meio de ensaios, todos os princípios de funcionamento da proposta de conversor CA-CC. Pelos resultados experimentais, obteve-se corrente drenada...
This work proposes a new AC-DC three-phase multipulse converter with DC-DC boost stages and constant hysteresis control. The objective of this converter is to provide a reliable DC bus for on-board applications, electric motor drives and similars, always considering power quality issues. Thus, the proposal presents high power factor and low harmonic distortions in the currents from the mains. A wide revision is made on other recent proposals found in the scientific literature. Different topologies are compared considering power circuits, control techniques, isolation possibility and robustness. The second chapter presents the details on the main proposal of this work and also the mathematical equations that describe the autotransformer, boost converters and control strategy. Later, simulation results are commented and discussed and the physical design is detailed. The output filter elements, power components and control elements are specified. Experimental results including main waveforms, efficiency, voltage regulation and temperature rise are presented for the autotransformer. The boost stages are also tested and its results are discussed. Finally, the proposed AC-DC converter is tested and the control technique applied to the power stage is validated
Aban, Vahap Volkan. "The Design, Control, And Performance Analysis Of Ac Motor Drives With Front End Diode Rectifier Utilizing Low Capacitance Dc Bus Capacitor And Comparison With Conventional Drives." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615099/index.pdf.
Повний текст джерелаGhasemi, Negareh. "Improving ultrasound excitation systems using a flexible power supply with adjustable voltage and frequency to drive piezoelectric transducers." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61091/1/Negareh_Ghasemi_Thesis.pdf.
Повний текст джерелаRivas, Juan 1976. "Radio frequency dc-dc power conversion." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38691.
Повний текст джерелаIncludes bibliographical references (p. 197-204).
THIS THESIS addresses the development of system architectures and circuit topologies for dc-dc power conversion at very high frequencies. The systems architectures that are developed are structured to overcome limitations associated with conventional designs. In particular, the new architectures described here structure the energy processing and control functions of the system in such a manner that high efficiency can be achieved across wide load range while regulating the output. Moreover, these architectures are amenable to circuit designs operating at fixed frequency and duty ratio, considerable easing the circuit design. The thesis also develops new circuit designs that are well suited to these new architectures. As part of this, two new gate drives and control methods are introduced that greatly reduce gating loss at VHF frequencies for fixed frequency, fixed duty ratio operation. One of these gating schemes provides near theoretical minimum loss by resonantly wave shaping the gate voltage to have a trapezoidal drive voltage. This waveshaping approach is then taken a step further, yielding a new class of dc-dc converter that archives a significant reduction in peak switch voltage stress, requires small passive components with low energy storage, and provides the capability for extremely rapid startup and shutdown. This new class of converter is well adapted to the architectures and gate drive methods proposed in the thesis. It is expected that the new architectures and circuit designs introduced here will contribute to the development of power converter having greatly reduced size and improved transient performance.
by Juan Rivas.
Sc.D.
Francisco, Venustiano Canales Abarca. "Novel DC/DC Converters For High-Power Distributed Power Systems." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/28612.
Повний текст джерелаPh. D.
Klusáček, Jan. "Řízení toků energie v energetickém systému s více akumulačními jednotkami." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413128.
Повний текст джерелаHouari, Azeddine. "Contribution à l'étude de micro-réseaux autonomes alimentés par des sources photovoltaïques." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0293/document.
Повний текст джерелаThe actual electrical energy demand focuses on the development of stand-alone electrical systems which leads to the definition of new directives on performances and reliability of the electrical structures, especially those based on renewable energy. The main objective of this work concerns the development of new tools to improve the power quality and the stability of autonomous micro-grid systems. In this aim, new control algorithms based on the concept of differential flatness have been developed. The main advantage of the proposed technique is the possibility of implementing one loop controllers ensuring high dynamic properties. In the same time, it allows accurate prediction of the evolution of all state variables of the system. Concerning the stability of the autonomous micro-grid systems, we proposed tools to deal with instability phenomena either caused by the loss of load information and the resonance phenomenon of the passive filters
Zengel, Jason A. "DC-DC power conversion with galvanic isolation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FZengel.pdf.
Повний текст джерелаThesis advisor(s): Robert W. Ashton, Todd R. Weatherford. Includes bibliographical references (p. 83-84). Also available online.
Wahby, Riad Samir 1981. "Radio frequency rectifiers for DC-DC power conversion." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/16690.
Повний текст джерелаIncludes bibliographical references (p. 75-78).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
A significant factor driving the development of power conversion technology is the need to increase performance while reducing size and improving efficiency. In addition, there is a desire to increase the level of integration of DC-DC converters in order to take advantage of the cost and other benefits of batch fabrication techniques. While advances in the power density and integration of DC-DC converters have been realized through development of better active device technologies, much room for improvement remains in the size and fabrication of passive components. To achieve these improvements, a substantial increase in operating frequency is needed, since intermediate energy storage requirements are inversely proportional to frequency. Unfortunately, traditional power conversion techniques are ill-suited to handle this dramatic escalation of switching frequency. New architectures have been proposed which promise to deliver radical performance improvements while potentially reaching microwave frequencies. These new architectures promise to enable substantial miniaturization of DC-DC converters and to permit much a higher degree of integration. The principal effort of this thesis is the development of design and characterization methods for rectifier topologies amenable to use in the new architectures. A computational design approach allowing fast and accurate circuit analysis and synthesis is developed and applied, along with traditional analysis, to two demonstrative rectifier topologies. In addition, the application of coupled magnetic structures for parasitic mitigation is considered. Experimental implementations are investigated to verify analytic and computational results.
by Riad Samir Wahby.
M.Eng.
Das, Sauparna 1979. "A low noise, low power DC/DC converter for cell phone power applications." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87235.
Повний текст джерелаIncludes bibliographical references (leaf 125).
by Sauparna Das.
M.Eng.and S.B.
Jia, Hongwei. "Highly Integrated DC-DC Converters." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3194.
Повний текст джерелаPh.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering PhD
Olm, i. Miras Josep M. "Asymptotic Tracking with DC-to-DC Bilinear Power Converters." Doctoral thesis, Universitat Politècnica de Catalunya, 2004. http://hdl.handle.net/10803/5940.
Повний текст джерелаL'objectiu de la tesi és aconseguir que els convertidors DC-DC de potència bàsics puguin seguir referències alternes mitjançant el voltatge de sortida. També es desenvolupen esquemes robustos per tal d'eliminar l'efecte de possibles pertorbacions en la tasca de seguiment. Els modes de lliscament s'usen com a tècnica de control, i es presenten resultats de simulació.
La tesi s'organitza en capítols. El primer i el segon contenen una introducció i una revisió de la literatura existent. Els continguts i distribució de la resta de capítols segueix a continuació.
El capítol 3 tracta el seguiment exacte i asimptòtic d'una referència variable en el temps per part del voltatge de sortida d'un convertidor reductor, controlat indirectament via el corrent d'entrada. A partir de l'estudi del problema del seguiment en sistemes lineals amb guanys fixos -mitjançant la teoria de mòduls- s'obtenen restriccions sobre els possibles senyals a seguir. A més, es proporciona una estratègia de control lliscant per aconseguir el seguiment, consistent en un procediment per modificar una superfície de lliscament inicialment bona en tasques de regulació i una llei de control. Una adequada elecció de variables d'estat permet que les possibles pertorbacions de la resistència de càrrega satisfacin la condició de superposició.
En el capítol 4 s'usa un procediment basat en inversió per aconseguir el seguiment exacte de referències periòdiques amb la resistència de càrrega dels convertidors no lineals boost i buck-boost. També s'obtenen condicions suficients per a possibles senyals a seguir. Es presenta també un marc general per a un tractament via inversió del problema de seguiment exacte en una certa classe de sistemes bilineals de segon ordre: aquells en els quals el problema d'inversió dóna lloc a una EDO del tipus Abel.
El capítol 5 estudia l'ús del mètode de Galerkin -una generalització del mètode del Balanç Harmònic- en la solució aproximada del problema invers aparegut al capítol anterior, així com l'efecte que té la seva utilització en el control del sistema. Es demostra l'existència d'una successió de solucions aproximades de l'EDO que representa l'esmentat problema invers. També es prova que aquesta successió convergeix uniformement cap a la solució periòdica de l'EDO, i s'obté una cota d'error. La sortida del sistema presenta un comportament periòdic i asimptòticament estable quan es fa anar la successió d'aproximacions de Galerkin en el control del sistema. A l'hora, la successió de sortides periòdiques presenta convergència uniforme cap a la funció desitjada sota una hipòtesi raonable. També s'obtenen en aquest cas cotes d'error.
En el capítol 6 s'aconsegueix seguiment asimptòtic aproximat per a convertidors no lineals bàsics que presenten pertorbacions de càrrega. Això es fa mitjançant un control adaptatiu que estima el paràmetre pertorbat i una aproximació de Galerkin de primer ordre que incorpora l'actualització on-line a una superfície de lliscament apropiada.
El capítol 7 proposa exercir un control directe del voltatge de sortida en convertidors boost i buck-boost bidireccionals, tot aprofitant la robustesa davant pertorbacions externes que ofereix aquest tipus de control. Es segueixen referències periòdiques mentre el voltatge de sortida es regula independentment a un nivell prefixat.
Nowadays, DC-to-AC conversion has an important practical application in the field of uninterruptible power systems (UPS). Basic DC-to-DC switch mode power converters (the buck, which is linear, and the boost and buck-boost, which are nonlinears) possess a very simple structure, and during the last fifteen years the possibility of using them in DC-to-AC conversion schemes has been studied.
The aim of this thesis is to achieve that the output voltage of the DC-to-DC buck, boost and buck-boost power converters can track periodic references. Robust schemes to eliminate disturbance effects in the tracking task are also developed. Sliding modes are used as the control technique, and the obtained results are validated by numeric simulation.
The thesis is organized in chapters. The first and the second one contain an introduction and a review of the existing literature. The contents and contributions of the other chapters follow below.
Chapter 3 deals with the exact and asymptotic tracking of a time varying reference by the load voltage of a step-down converter, indirectly controlled through the input current. Departing from the study of the tracking problem in linear systems with fixed gains with the aid of module theory, conditions over possible reference signals have been obtained. Moreover, a sliding mode strategy to achieve the control target, consisting in a procedure to modify a switching surface initially good for regulation tasks and a control law, is provided. An approppriate choice of state variables allows possible load perturbations to satisfy the matching condition.
In chapter 4, an inversion-based indirect control is used to reach exact tracking of periodic references with the load resistance of nonminimum phase, nonlinear boost and buck-boost converters. Sufficient conditions for candidate references are also obtained. A general frame for an inversion-based treatment of the perfect tracking problem in a certain class of nonminimum phase, second order bilinear systems is proposed: those in which the inversion problem gives raise to an ODE of the Abel type.
Chapter 5 studies the use of the Galerkin method -a generalization of the Harmonic Balance method- in the approximate solution of the inverse problem stated in the former chapter, as well as the effect of its use on the control of the system. The existence of a sequence of approximate solutions for the ODE that represents the quoted inverse problem is proved. This sequence is also proved to converge uniformly to the periodic solution of the ODE, and an error bound has been derived. The system output exhibits a periodic and asymptotically stable behavior when the indirect control using the sequence of Galerkin approximations is performed. In turn, the sequence of periodic outputs is shown to exhibit uniform convergence to the original target function under a reasonable hypothesis. Error bounds have also been obtained.
In chapter 6, approximate asymptotic tracking is achieved for load perturbed, basic, nonlinear power converters. This is done by means of an adaptive control that estimates the perturbation parameter and a first order Galerkin approximation that incorporates the on-line updating into an appropriate sliding surface.
Chapter 7 propounds to exert a direct control of the output voltage in bidirectional boost and buck-boost converters, thus taking advantage of the insensitiveness to external disturbances offered by this type of control. Periodic references are followed, while the unstable inductor current is independently regulated at a prescribed level.
Jain, Manu. "Bi-directional DC-DC converter for low-power applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/MQ39979.pdf.
Повний текст джерелаGoldberg, Andrew Franklin. "A radio frequency DC-to-DC resonant power converter." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/27944.
Повний текст джерелаMICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.
Bibliography: leaves 136-139.
by Andrew Franklin Goldberg.
Elect.E.
Duncan, Joseph 1981. "A global maximum power point tracking DC-DC converter." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33152.
Повний текст джерелаIncludes bibliographical references (p. 79-80).
This thesis describes the design, and validation of a maximum power point tracking DC-DC converter capable of following the true global maximum power point in the presence of other local maximum. It does this without the use of costly components such as analog-to-digital converters and microprocessors. It substantially increases the efficiency of solar power conversion by allowing solar cells to operate at their ideal operating point regardless of changes in load, and illumination. The converter switches between a dithering algorithm which tracks the local maximum and a global search algorithm for ensuring that the converter is operating at the true global maximum.
by Joseph Duncan.
M.Eng.
Sagneri, Anthony (Anthony David). "Design of miniaturized radio-frequency DC-DC power converters." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/71488.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 321-325).
Power electronics appear in nearly every piece of modern electronic hardware, forming an essential conduit from electrical source to load. Portable electronics, an area where a premium is placed on size, weight, and cost, are driving the development of power systems with greater density and better manufacturability. This motivates a push to higher switching frequencies enabling smaller passive components and better integration. To realize these goals this thesis explores devices, circuits, and passives capable of operating efficiently into the VHF regime (30-300 MHz) and their integration into power electronic systems of high power density. A good integrated power MOSFET presages high-density converters. Previous VHF systems were demonstrated with bulky and expensive RF Lateral, Double-Diffused MOSFETs (LDMOSFET). We show that through a combination of layout optimization and safe operating area (SOA) extension integrated devices can achieve near-parity performance to their purpose-built RF discrete cousins over the desired operating regime. A layout optimization method demonstrating a 2x reduction in device loss is presented alongside experimental demonstration of SOA extension. Together the methods yield a 3x reduction in loss that bolsters the utility of the typical (and relatively inexpensive) LDMOS IC power process for VHF converters. Passive component synthesis is addressed in the context of an isolated VHF converter topology. We present a VHF topology where most of the magnetic energy storage is accomplished in a transformer that forms an essential part of the resonant network. The reduced component count aids in manufacturability and size, but places difficult requirements on the transformer design. An algorithm for synthesizing small and efficient air-core transformers with a fully-constrained inductance matrix is presented. Planar PCB transformers are fabricated and match the the design specifications to within 15%. They are 94% efficient and have a power density greater than 2kW per cubic inch. To take full advantage of good devices and printed passives, we develop an IC for the isolated converter having optimized power devices, and integrated gate driver, controller, and hotel functions. The chip is assembled into a complete converter system using the transformers and circuits described above. Flip-chip mounting is used to overcome bondwire parasitics, and reduce packaging volume. The final system achieves 75% efficiency at 75 MHz at 6W.
by Anthony D. Sagneri.
Ph.D.
Li, Yanchao. "High Power Density and High Efficiency DC-DC Converters." Diss., North Dakota State University, 2018. https://hdl.handle.net/10365/28879.
Повний текст джерелаVan, Der Kogel André, and Niklas Österlund. "High frequency dc/dc power converter with galvanic isolation." Thesis, Linköpings universitet, Fysik och elektroteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128831.
Повний текст джерелаGrobler, Inus. "Conducted EMC Modelling in Modern DC-DC Power Converters." Thesis, University of Pretoria, 2017. http://hdl.handle.net/2263/59324.
Повний текст джерелаThesis (PhD)--University of Pretoria, 2017.
Electrical, Electronic and Computer Engineering
PhD
Unrestricted
Morton, Anthony B. "Managed DC power reticulation systems /." Connect to thesis, 1999. http://eprints.unimelb.edu.au/archive/00000655.
Повний текст джерелаRosas, Espejel Juventino Delfino. "RF to DC power generation." College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/176.
Повний текст джерелаThesis research directed by: Dept. of Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Baltierrez, Jason. "Multiple Input, Single Output DC-DC Conversion Stage for DC House." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2028.
Повний текст джерелаVeilleux, Etienne. "DC power flow controller and Marx DC-DC converter for multiterminal HVDC system." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116919.
Повний текст джерелаCette thèse présente le concept d'un contrôleur de transit de puissance afin de résoudre la problématique de contrôle des mouvements d'énergie dans un réseau multiterminal à courant continu à haute tension (CCHT). Le contrôleur est installé en série sur la ligne de transport CCHT et il est présenté comme un module ajouté à une station convertisseur à CCHT. Le fonctionnement et la stabilité sont démontrés à l'aide de simulations dans des systèmes multiterminaux de 3 et de 7 terminaux. Le contrôleur augmente la flexibilité et l'étendue de l'exploitation d'un système multiterminal CCHT.L'intégration d'un parc éolien installé en mer avec un système multiterminal CCHT est aussi étudiée. En utilisant un réseau à courant continu (cc) pour collecter la puissance produite par les éoliennes, les coûts d'infrastructure associés au support de lourds transformateurs à courant alternatif (ca) requis pour la station du convertisseur servant au transport CCHT peuvent être évités. Le défi consiste à relier les deux tensions cc en omettant l'utilisation de transformateurs ca.Cette thèse introduit et analyse une nouvelle topologie de convertisseurs cc-cc qui est basée sur le concept du générateur Marx. Ce concept consiste à charger des condensateurs en parallèle pour ensuite les connecter en série afin de créer une tension cc plus élevée. Un convertisseur avec une configuration multi-étapes est simulé pour une démonstration de faisabilité. À partir de balises de conceptions, un prototype de 5kW a été conçu, simulé et construit afin de vérifier expérimentalement la topologie du convertisseur. La stabilité de la topologie a été analysée en utilisant une approche de données échantillonnées et des caractéristiques nominales des semiconducteurs de puissance et des composants passifs sont évaluées.Pour l'application dans un parc éolien installé en mer, le convertisseur cc-cc Marx est jumelé avec un hacheur survolteur afin de former une station Marx qui lie le réseau collecteur cc de 10kV au réseau de transport CCHT de 250kV. La station Marx est simulée avec un parc éolien et un convertisseur onduleur.Les deux parties de cette thèse, soit le contrôleur de transit de puissance et le convertisseur cc-cc Marx, sont regroupés dans un même système multiterminal CCHT. Le réseau simulé comprend six stations convertisseurs de type « voltage source converter », la station Marx avec le parc éolien installé en mer et le contrôleur de transit de puissance. Le contrôleur de transit de puissance et le convertisseur cc-cc élargissent la portée du système multiterminal CCHT.
Swaisi, Mahmoud. "DC distribution grid and the associated advanced DC/DC converter." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/43494/.
Повний текст джерелаCliffe, Robert J. "High power high frequency DC-DC converter topologies for use in off-line power supplies." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/7305.
Повний текст джерелаOshaben, Edward J. "DC-DC Power Converter Design for Application in Welding Power Source for the Retail Market." Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1296178360.
Повний текст джерелаNassif-Khalil, Sameh G. "CMOS-compatible power MOSFETs for on-chip DC/DC converters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0023/MQ50383.pdf.
Повний текст джерелаBeatty, Debra Ann Kemnitz. "Simulation of a family of DC-to-DC power supplies." Honors in the Major Thesis, University of Central Florida, 1995. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/137.
Повний текст джерелаBachelors
Engineering
Electrical Engineering
Neugebauer, Timothy Carl 1975. "Computer-aided design and optimization of dc/dc power converters." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9126.
Повний текст джерелаIncludes bibliographical references.
The imminent introduction of a dual-voltage automotive electrical system has motivated the development of dc/dc converters that are optimized it terms of price, weight, and volume. This thesis investigates the design and optimization of dc/dc converters for dual-voltage automotive electrical system. A prototype dc/dc converter is developed and experimental evaluated, and is used to identify a number of tradeoffs and critical design issues. Based on this information, a CAD optimization tool is developed which allows the design space to be rapidly explored and highly optimized converter design to be developed. The CAD optimization tool is also used to study the effects of variations in system-level specifications on the characteristics of optimized converters.
by Timothy Carl Neugenbauer.
S.M.
Inam, Wardah. "High efficiency resonant dc/dc converter for solar power applications." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79153.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 109).
This thesis presents a new topology for a high efficiency dc/dc resonant power converter that utilizes a resistance compression network to provide simultaneous zero voltage switching and near zero current switching across a wide range of input voltage, output voltage and power level. The resistance compression network maintains desired current waveforms over a wide range of voltage operating conditions. The use of on/off control in conjunction with narrowband frequency control enables high efficiency to be maintained across a wide range of power levels. The converter implementation provides galvanic isolation and enables large (greater than 1:10) voltage conversion ratios, making the system suitable for large step-up conversion in applications such as distributed photovoltaic converters. Three 200 W prototypes were designed, built and tested. The first prototype was made as a proof of concept and operated at a switching frequency of 100 kHz. It had an efficiency of 93.5% (at 25 V input and 400 V output). The second prototype was operated at a switching frequency of 500 kHz and had an efficiency of 93% (at 25 V input and 400 V output). The high frequency losses caused by the ringing in voltage and current due to the resonating parasitics of the transformer were removed with the help of a matching network in the third prototype. This final prototype operated at a switching frequency of 500 kHz and showed that over 95% efficiency is maintained across an input voltage range of 25 V - 40 V (at 400 V output) and over 93.7 % efficiency across a wide output voltage range of 250 V - 400 V (at 25 V input). These experimental results demonstrated the effectiveness of the proposed design.
by Wardah Inam.
S.M.
Curuvija, Boris. "Design of High Power Density Switched Capacitor DC-DC Converter." Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/28694.
Повний текст джерелаZhang, Junhong. "Bidirectional DC-DC Power Converter Design Optimization, Modeling and Control." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26126.
Повний текст джерелаPh. D.
Hultman, August. "DC-DC Converter Design for Solar Power in Hot Environments." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-138709.
Повний текст джерелаBoora, Arash Abbasalizadeh. "Flexible high-power multi DC-DC converters for train systems." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33208/1/Arash_Boora_Thesis.pdf.
Повний текст джерелаNathan, Kumaran Saenthan. "A novel DC-DC converter for photovoltaic applications." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/288881.
Повний текст джерелаLanglois, Thomas L. "The analysis of interconnected, high-power DC-DC converters for DC zonal electrical distribution." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333405.
Повний текст джерелаCastro, Lino Alfredo de. "Design Of DC/DC Z-source converter for a photovoltaic system connected to DC microgrid." Universidade Federal do CearÃ, 2016. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16768.
Повний текст джерелаThis work proposes study and implementation of a DC/DC Z-source converter operating in continuous conduction mode (CCM); It is applied to a photovoltaic system connected to a DC microgrid; aiming to inject the electricity supplied from PV array; To this end; the PV array is connected to the input of Z-source converter; which rises from 167V to 400V and injects the output current at the DC bus; using maximum power point tracking techniques (MPPT); The prototype implemented in the laboratory was developed for 1;38 kW output power; with the possibility to be fed either by a DC current source or DC voltage source; which does not happen with traditional converters (Buck; Boost; etc); The average efficiency achieved yield of 94%; As for the electric power processing from renewable sources; two heuristic methods were tested: Perturbe and Observe (P&O) and Conductance Incremental (IC); The average efficiency of the prototype; using the P&O technique in tracking maximum power was 79;9%; while using the second technique (IC) the average efficiency was a 82;5% ;
O presente trabalho propÃe o estudo e a implementaÃÃo de um conversor CC/CC Z-source; operando em modo de conduÃÃo contÃnuo (MCC); O mesmo à aplicado em um sistema fotovoltaico interligado a uma microrede CC; objetivando injetar a energia elÃtrica fornecida a partir de arranjo fotovoltaico;Para tal; o arranjo fotovoltaico à conectado na entrada do conversor Z-source; que a eleva de 167V para 400V e injeta a corrente de saÃda no barramento CC de 400V; utilizando tÃcnicas de rastreamento do ponto de mÃxima potÃncia (MPPT); O protÃtipo implementado em laboratÃrio foi desenvolvido para uma potÃncia nominal de saÃda de 1;38 kW com possibilidade de ser alimentado tanto por uma fonte CC de corrente ou uma fonte CC de tensÃo; diferenciando-se dos conversores tradicionais (Buck; Boost; etc); O mesmo alcanÃou um rendimento mÃdio de 94%; Quanto ao processamento de energia elÃtrica a partir de fontes renovÃveis; foram testados dois mÃtodos heurÃsticos: Pertube e Observe (P&O) e CondutÃncia Incremental (IC); A eficiÃncia mÃdia do protÃtipo usando a tÃcnica P&O no rastreamento da mÃxima potÃncia foi de 79;9%; enquanto usando a segunda tÃcnica alcanÃou-se uma eficiÃncia de 82;5% ;
Lin, Shouee B. "A Low-Cost Loop Measurement Tool For DC-DC Converters." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1481.
Повний текст джерелаYang, Kun-Te, and 楊坤德. "Power Quality Improvement for DC Arc Furnace." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/41252735032064419317.
Повний текст джерела國立臺北科技大學
電機工程系碩士班
92
It well known that DC arc furnace requires large capacity rectification equipment and thereby resulting in significant harmonics. Although for the same capacity, the flickers caused by DC arc furnace is only half of that caused by AC one, the resulting impact to power system can’t be neglected due to its large capacity. In this thesis, a case of DC arc furnace with 100 tons is investigated. It was accompanied with filters to cope with the low order odd harmonics, e.g. 3rd, 5th, 7th and 11th harmonics, and no facilities were installed to deal with the even harmonics. Therefore, the associated harmonics may not meet the Tai-power requirement under particular kind of circumstance. Moreover, the flickers caused by the illustrated DC arc furnace may meet the standard of Tai-power using dedicated power line in which the point of common coupling locates at the substation of Tai-power. However, due to the number of user increases and parallel connection to the power line, the point of common coupling is moved to the duty point. Therefore, the flickers caused by the illustrated DC arc furnace can’t meet the standard of Tai-power any more. In this thesis, the harmonics, voltage sags and flickers for the illustrated DC arc furnace are analyzed according to the measured results. The results show that 50 MVR filters for dealing with the even harmonics, e.g. 2nd, 4th, and 6th harmonics, a 90 MVR Thyristor Controlled Reactor (TCR), and other switching equipment are required in order to meet the standards of Tai-power. With this additional Thyristor-controlled Q Compensators (TQC) consisted of LC filters, TCR and switching equipment, the harmonics, voltage sags and flickers issues can be improved. It is expected to measure the system after installation for further analysis to see whether the power quality is improved.
Tasi, Chao-Yang, and 蔡詔揚. "Intelligent Controlled DSTATCOM for Power Quality Improvement and DC-Link Voltage Regulation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9yyb85.
Повний текст джерела國立中央大學
電機工程學系
106
A distribution static compensator (DSTATCOM) is proposed to improve power quality, including the grid current harmonic and power factor, resulted from the nonlinear and linear loads. On the other hands, since the instantaneous power following into or out of the DC-link capacitor on the DC side of the DSTATCOM, a sudden load change may cause a serious DC-link voltage fluctuation across the dc capacitor. Hence, the DC-link voltage regulation control of the DSTATCOM is important especially under load variation. In this study, to improve the power quality and keep the DC-link voltage of the DSTATCOM constant under variation of nonlinear and linear loads effectively, the traditional proportional-integral (PI) controller is substituted with a novel online trained compensatory neural fuzzy network with an asymmetric membership function (CFNN-AMF) controller. In the proposed CFNN-AMF, the compensatory parameter to integrate pessimistic and optimistic operations of fuzzy systems is embedded in the CFNN. Moreover, the dimensions of the Gaussian membership functions are directly extended to AMFs for the optimization of the fuzzy rules and the upgrade of learning ability of the networks. Furthermore, the network structure and online learning algorithms of the proposed CFNN-AMF are introduced in detail. Finally, the effectiveness and feasibility of the DSTATCOM using the proposed CFNN-AMF controller for the improvement of power quality and maintaining the constant DC-link voltage under nonlinear and linear load change have been demonstrated by some experimental results.
RUVIO, ALESSANDRO. "Distortion and faults detection in shipboard AC/DC power distribution system." Doctoral thesis, 2019. http://hdl.handle.net/11573/1237720.
Повний текст джерела