Dissertations / Theses on the topic 'Device to grid'
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Shimotakahara, Kevin. "Device to Device Communications for Smart Grid." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40656.
Full textKanten, Bethany. "Power Monitoring Device for Off-Grid Solar." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:14398556.
Full textBürgler, Josef Franz. "Discretization and grid adaptation in semiconductor device modeling /." [S.l.] : [s.n.], 1990. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9146.
Full textConti, Paolo. "Grid generation for three-dimensional semiconductor device simulation /." Zürich, 1991. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9383.
Full textMinh, Hyunsik Eugene. "Communication options for protection and control device in Smart Grid applications." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82401.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 74-75).
Increasing use of electricity, interest in renewable energy sources, and need for a more reliable power grid system are some of the many drivers for the concept of the Smart Grid technology. In order to achieve these goals, one of the critical elements is communication between systems or between the system and human beings. With the decreasing cost of various communication technologies, especially wireless devices and utilities, researchers are increasingly interested in implementing complex two-way communication infrastructures to enhance the quality of the grid. The protection and control relay at the distribution level is one of the key component in enhancing the efficiency, security and reliability of power grid. At present, it may be premature to apply wireless devices to power electronics and to distribution automation, especially for protection and control relays in the distribution level. While fiber technology is still very attractive for protection and control applications in general, wireless technology can bring improvements in user experience applications in the future. The ABB medium voltage group needs to overcome challenges that arise from conservative industry structure, increasing complexity and cost of the product, and needs for higher reliability and security. However, with collaborative efforts among different product groups, the medium voltage group will successfully develop next generation distribution feeder relay.
by Hyunsik Eugene Minh.
S.M.
M.B.A.
Kalalas, Charalampos. "Cellular networks for smart grid communication." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/620760.
Full textLas redes celulares, p.e., los sistemas LTE/LTE-A, aparecen como una tecnología prometedora para facilitar la evolución de la próxima generación del sistema eléctrico de potencia, conocido como smart grid (SG). Sin embargo, la tecnología celular no fue pensada originalmente para las comunicaciones en la SG, asociadas con el intercambio fiable de mensajes y con requisitos de conectividad de un número masivo de dispositivos. Las diferencias fundamentales entre las comunicaciones en la SG y la comunicación de tipo humano desafían el diseño clásico de las redes celulares e introducen importantes cuestiones de investigación que hasta ahora no se han abordado suficientemente. Motivada por estos retos, esta tesis doctoral investiga los principios de diseño y analiza el rendimiento de una nueva red de acceso radio (RAN) que permita una integración perfecta del tráfico de la SG en las redes celulares futuras. Nos centramos en los problemas fundamentales de escalabilidad de la RAN en despliegues de SG masivos, y en la gestión de los recursos radio para la integración del tráfico de la SG con el tráfico de tipo humano. El objetivo principal de la tesis consiste en el diseño, el análisis y la evaluación del rendimiento de los mecanismos de las RAN que convertirán a las redes celulares en el elemento clave para las aplicaciones emergentes de las SGs. La primera parte de la tesis aborda las limitaciones del acceso radio en redes LTE para la comunicación fiable y escalable en SGs. En primer lugar, identificamos el problema de congestión en el acceso aleatorio de LTE que aparece en los despliegues de SGs a gran escala. Para superar este problema, se propone un nuevo mecanismo de acceso aleatorio que permite soportar de forma eficiente los servicios de automatización de la distribución eléctrica en tiempo real, con un impacto insignificante en el tráfico de fondo. Motivados por los estrictos requisitos de fiabilidad de las diversas operaciones en la SG, desarrollamos un modelo analítico del procedimiento de acceso aleatorio de LTE que nos permite evaluar el rendimiento del tráfico de monitorización de la red eléctrica basado en eventos bajo diversas condiciones de carga y configuraciones de red. Además, ampliamos nuestro análisis para incluir la relación entre el tamaño de celda y la disponibilidad de recursos de acceso aleatorio ortogonales, e identificamos un reto adicional para la conectividad fiable en la SG. Con este fin, diseñamos un mecanismo de planificación celular que tiene en cuenta las interferencias y la carga de la red, y que mejora la fiabilidad en los servicios de automatización de las subestaciones eléctricas. Finalmente, combinamos el problema de la estimación de estado en sistemas de monitorización de redes eléctricas de área amplia con los retos de fiabilidad en la adquisición de la información. Utilizando el modelo analítico desarrollado, cuantificamos el impacto de la baja fiabilidad en las comunicaciones sobre la precisión de la estimación de estado. La segunda parte de la tesis se centra en el problema de scheduling y compartición de recursos en la RAN para el tráfico de SG y el tráfico de tipo humano. Presentamos un nuevo scheduler que proporciona baja latencia para el tráfico de automatización de la distribución eléctrica, mientras que la asignación de recursos se realiza de un modo que mantiene la degradación de los usuarios celulares en un nivel mínimo. Además, investigamos los beneficios del modo de transmisión Device-to-Device (D2D) en el intercambio de mensajes basados en eventos en escenarios de automatización de subestaciones eléctricas. Diseñamos un mecanismo conjunto de asignación de recursos y selección de modo que da como resultado tasas de datos más elevadas con respecto al modo de transmisión convencional a través de la estación base. Finalmente, se propone un esquema de partición de recursos ortogonales entre enlaces celulares y D2
Schmithüsen, Bernhard. "Grid adaptation for the stationary two-dimensional drift-diffusion model in semiconductor device simulation /." Zürich : [s.n.], 2002. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=14449.
Full textXu, Chunchun. "High Accuracy Real-time GPS Synchronized Frequency Measurement Device for Wide-area Power Grid Monitoring." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27007.
Full textPh. D.
Milette, Greg P. "Analogical matching using device-centric and environment-centric representations of function." Link to electronic thesis, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-050406-145255/.
Full textKeywords: Analogy, Design, Functional Modeling, Functional Reasoning, Knowledge Representation, Repertory Grid, SME, Structure Mapping Engine, AI in design. Includes bibliographical references (p.106).
Orebowale, Patience B. "Investigating the stability of geosynthetic landfill capping systems." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/7786.
Full textLiang, Hongwei. "Development of microwave and millimeter-wave pin grid array and ball grid array packages." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14867.
Full textSilva, Humberto de Alencar Pizza da. "Protetor de redes inteligente e relé digital com tecnologia nacional integrando proteção, controle, telecomando e monitoramento viabilizando smart grid e geração distribuída a partir dos sistemas de distribuição subterrâneos nas grandes metrópoles." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/86/86131/tde-08062011-112922/.
Full textThe importance of new technologies in the field of, automation, monitoring, information technology and electronic systems have increased significantly in recent years. These technologies play a basic role in the modern society and contribute of decisive way for the resolution of important challenges for a society that is in search of a more prosperous life, internationally competitive, healthful, safe and sustainable. As a key of \"innovation\", these technologies are key factors for all the productive sectors of the economy in the society. The fuel for the engine of these technologies, however, is the energy, particularly the electricity. Thus, in a society whose life style is strongly dependent of electricity, to develop technologies that not only allow the generation, but also the distribution of energy in a cheap and clean way and which could guarantee its supply throughout the time with the maximum efficiency is a priority issue. The systems based on intelligent networks fully meet these requirements, representing what there is of most modern in the electric sector. The Brazilian energy scenario is quickly changing over the recent years toward modernization, with more distributed generation, in the form of smaller generators, more customer interaction, the integration of more variable resources such as wind and solar, and more renewables overall. For the Power Utilities, especially in the Distribution Sector, the focus is clearly in the reduction of commercial losses and operational costs, mainly by means of the modernization of the assets and an increase in the installation of intelligent electronic devices at consumers side (e.g.: electronic energy meters, intelligent electronic devices for condition monitoring, digital relays etc.). This work presents a solution developed based on Brazilian technology that incorporates all the benefits of smart grid to the most important equipment that is present in the topology of the Low-Voltage Secondary Network Distribution System: the Network Protector. From the neuralgic center of these Low-Voltage Secondary Network Systems, which topology is used in the most important cities in Brazil, which has a high load concentration, the solution presented here make it feasible technically and economically the use of smart grid topology profiting from its great benefits such as: Allow utilities to better optimize the grid to support a number of public policies, from intermittent renewable integration to more dynamic interfaces with customers; Offer utilities more flexibility relative to how they use energy toward the greater societal objectives of reducing greenhouse gases and energy consumption. In the short and mid term, a smarter grid offers utilities operational benefits (outage management, improved processes, maintenance and workforce efficiency, reduced losses, etc.) as well as benefits associated with improved asset management (system planning, better capital asset utilization, etc.), lower investment to acquire new Network Protectors.
Sabillón, Antúnez Carlos Francisco. "Mathematical optimization of unbalanced networks operation with smart grid devices." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/154075.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
As redes de distribuição de energia elétrica devem estar preparadas para fornecer um serviço econômico e confiável a todos os clientes, bem como para integrar tecnologias relacionadas à geração distribuída, armazenamento de energia e veículos elétricos. Uma representação adequada da operação das redes de distribuição, considerando as tecnologias de redes inteligentes, é fundamental para atingir esses objetivos. Este trabalho apresenta formulações matemáticas para a operação em regime permanente das redes de distribuição, que consideram o desequilíbrio de redes trifásicas. Modelos matemáticos da operação de dispositivos relacionados à redes inteligentes presentes em redes de distribuição são desenvolvidos (e.g., dispositivos de controle volt-var, sistemas de armazenamento de energia e veículos elétricos). Além disso, características relacionadas à dependência da tensão das cargas, geração distribuída e limites térmico e de tensão também estão incluídos. Essas formulações constituem um marco matemático para a análise de otimização da operação das redes de distribuição de energia elétrica, o que possibilita modelar os processos de tomada de decisões. Objetivos diferentes relacionados a aspectos técnicos e/ou econômicos podem ser almejados dentro deste marco; Além disso, a extensão para otimização multi-período e multi-cenário é discutida. Os modelos apresentados são construídos com base em formulações de programação linear inteira mista, evitando o uso de formulações não-lineares inteiras mistas convencionais. A aplicação do marco apresentado é ilustrada em abordagens de controle para coordenação de carregamento de veículos elétricos, controle de magnitude de tensão e controle de geração distribuída renovável. Diversos métodos são desenvolvidos, com base no marco de otimização matemática, para otimizar a operação de sistemas de distribuição desbalanceados, considerando não apenas diferentes penetrações de veículos elétricos e fontes de energia renováveis, mas também a presença de sistemas de armazenamento e dispositivos de controle volt-var. A este respeito, o agendamento dinâmico e a otimização multi-período de janela rolante são frequentemente usados para alcançar uma operação ótima na rede. A eficácia e robustez das metodologias, bem como a confiabilidade do marco de otimização matemática, são verificados usando vários sistemas de teste (e.g., 123-node, 34-node e 178-node) com nós de média e baixa tensão, diferentes janelas de controle e várias disponibilidades de controle relacionadas aos dispositivos de rede inteligente.
Electric distribution networks should be prepared to provide an economic and reliable service to all customers, as well as to integrate technologies related to distributed generation, energy storage, and plug-in electric vehicles. A proper representation of the electric distribution network operation, taking into account smart grid technologies, is key to accomplish these goals. This work presents mathematical formulations for the steady-state operation of electric distribution networks, which consider the unbalance of three-phase grids. Mathematical models of the operation of smart grid-related devices present in electric distribution networks are developed (e.g., volt-var control devices, energy storage systems, and plug-in electric vehicles). Furthermore, features related to the voltage dependency of loads, distributed generation, and voltage and thermal limits are also included. These formulations constitute a mathematical framework for optimization analysis of the electric distribution network operation, which could assist planners in decision-making processes. Different objectives related to technical and/or economic aspects can be pursued within the framework; in addition, the extension to multi-period and multi-scenario optimization is discussed. The presented models are built based on mixed integer linear programming formulations, avoiding the use of conventional mixed integer nonlinear formulations. The application of the presented framework is illustrated throughout control approaches for plug-in electric vehicle charging coordination, voltage magnitude control, and renewable distributed generation control. Several methods are developed, based on this framework, to optimize the operation of unbalanced distribution systems considering not only different penetrations of electric vehicles and renewable energy sources but also the presence of storage systems and volt-var control devices. In this regard, dynamic scheduling and rolling multi-period optimization are often used to achieve optimal economic operation in the grid. The effective and robustness of the methodologies, as well as the reliability of the mathematical framework, are verified using many test systems (e.g., 123-node, 34-node, and 178-node) with medium and low voltage nodes, different operation control time frames, and several control availabilities related to the smart grid devices.
Mikl, Marek. "Návrh přídavného pokládacího zařízení pro aplikaci rolí skelné geomříže GlasGrid®." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442818.
Full textGuan, Tao. "A system architecture to provide enhanced grid access for mobile devices." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/264489/.
Full textFormby, David. "A physical overlay framework for insider threat mitigation of power system devices." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53107.
Full textSánchez, Reátegui Rafael. "Porphyrins based detection of NH3 and CO, using field effect grid gate devices." Thesis, Linköping University, Applied Physics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56245.
Full textPorphyrins consist of twenty-atom rings containing four nitrogen atoms and can be used as sensor to detect odours and gases.
This thesis investigates whether or not porphyrins can be used as functional materials on grid gate devices. Drops of PVC embedded porphyrins were deposited on the surface of a grid gate which is a Metal Oxide Semiconductor (MOS) capacitor. In order to detect the gas sensing properties of the porphyrins a light addressable method called Scanning Light Pulse Technique (SLPT) has been used.
Drops of porphyrins were deposited with a stretched capillary tube (1 mm diameter).
The MOS capacitor has been exposed to nitrogen atmosphere as reference environment, while the target gases were carbon monoxide (100 ppm) and ammonia (500 ppm).
The result from the eight porphyrins is that one of them [Pt(II) TPP] has a response for both gases, ammonia induces a change in both the work function and surface resistance, while the carbon monoxide induces only a change in the surface resistance.
McGuire, Thomas John 1977. "Improved lifetimes and synchronization behavior in multi-grid inertial electrostatic confinement fusion devices." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38527.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
"February 2007."
Includes bibliographical references (p. 251-254).
A high output power source is required for fast, manned exploration of the solar system, especially the outer planets. Travel times measured in months, not years, will require high power, lightweight nuclear systems. The mature nuclear concepts of solidcore fission and fusion Tokamaks do not satisfy the lightweight criteria due to massive radiators and magnets respectively. An attractive alternative is Inertial Electrostatic Confinement fusion. This extremely lightweight option has been studied extensively and to date has produced significant fusion rates of order 1010 reactions per second, but at low power gains, no higher than Q = 10-4. The major loss mechanisms for the state-of-the-art IEC are identified via a detailed reaction rate scaling analysis. The use of a single cathode grid causes short ion lifetimes and operation at high device pressure for simple ion generation both fundamentally limit the efficiency of these devices. Several improvements, including operation at much lower pressure with ion guns and the use of multiple cathode grids, are verified with particle-in-cell modeling to greatly improve the efficiency of IECs. These simulations show that the greatly increased confinement allows for the development of significant collective behavior in the recirculating ions. The plasma self-organizes from an initially uniform state into a synchronized, pulsing collection of ion bunches.
(cont.) In simulations, these bunches are observed to be long-lived with lifetimes on the order of at least a tenth of a second, exceeding 20,000 passes. This represents a 3 order of magnitude improvement in confinement time and device efficiency. The synchronization of a bunch is due to the ion-ion interaction and kinematics of the well-confined IEC. The synchronization between beams is understood to arise from macroscale 'collisions' of bunches coupled with the kinematics of the device. Further, the collective effects limit the space charge buildup and higher densities result in violent ejection from the system. An IEC device which exploits the synchronization effect can achieve high efficiencies and gain, with fusion as the fastest collision timescale. Despite the potential of operation at break-even, the total power output is limited by the relatively low achievable core densities. The immediate application for this work is inexpensive neutron generators useful for medical, security, research, and industrial applications, but use much less power than a state-of-the-art IEC. The results of this thesis suggest two future research directions. First, neutralization of portions of the ion flow could allow greater densities and increase power output to levels required for space travel. Second, the idea of using kinematics coupled with ion-ion collisions to control thermalization may be applied to other plasma confinement concepts.
by Thomas J. McGuire.
Ph.D.
Asok, Kumar Aarthi. "TECHNICAL AND ECONOMIC IMPACTS OF DISTRIBUTED GENERATORS AND ENERGY STORAGE DEVICES ON THE ELECTRIC GRID." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11142008-151157/.
Full textBarik, Tapas Kumar. "Modern Adaptive Protection and Control Techniques for Enhancing Distribution Grid Resiliency." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/103644.
Full textDoctor of Philosophy
With widespread integration of inverter-based distributed energy resources (DERs) in the distribution grid, the conventional protection and control schemes no longer hold valid. The necessity of an adaptive protection scheme increases as the DER penetration in the system increases. Apart from this, changes in system topology and variability in DER generation, also change the fault current availability in the system in real-time. Hence, the protection schemes should be able to adapt to these variations and modify their settings for proper selectivity and sensitivity towards faults in the system, especially in systems with high penetration of DERs. These protection schemes need to be modified in order to properly identify and isolate faults in the network as well as correctly identify Loss of Mains (LOM) or islanding phenomenon. Special attention is needed to plan the next course of action after the islanding occurrence. Additionally, the protective devices in distribution system should be utilized to their maximum capability to create an adaptive and smart protection system. This document elaborately explains the research work pertaining to these areas.
Falls, Candice. "FRAILTY IN PATIENTS UNDERGOING LEFT VENTRICULAR ASSIST DEVICE IMPLANTATION." UKnowledge, 2019. https://uknowledge.uky.edu/nursing_etds/47.
Full textMasood, Tariq. "Improvement of voltage and power flow control in the GCC power grid by using coordinated FACTS devices." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589638.
Full textFoulkes, Philip James. "A grid based approach for the control and recall of the properties of IEEE 1394 audio devices." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1004836.
Full textIsaiadis, Stavros. "Dynamic service aggregation for integrating mobile and limited devices into hybrid grids." Thesis, University of Westminster, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442107.
Full textLakshminarayanan, Anand. "Analysis of the sensitivity of photochemical airshed modeling to grid size and spatial and temporal distributions aof mobile source emissions." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20835.
Full textAugspurger, Michael. "Improving the performance of finned latent heat thermal storage devices using a Cartesian grid solver and machine-learning optimization techniques." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6048.
Full textBottura, Riccardo. "Impatto della propagazione elettromagnetica sulle prestazioni delle reti M3N." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/2896/.
Full textDengiz, Thomas [Verfasser], and W. [Akademischer Betreuer] Fichtner. "Optimization approaches for exploiting the load flexibility of electric heating devices in smart grids / Thomas Dengiz ; Betreuer: W. Fichtner." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1232324027/34.
Full textStrauss, Ilse. "Typically developing 4-year-old children with AAC systems using different language organization techniques." Diss., Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-08042008-174658.
Full textMoravčík, Martin. "Modelování a simulace hybridní mikro sítě v prostředí PSCAD." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219410.
Full textSilveira, Miguel Francisco da. "Análise do impacto da geração distribuída sobre a rede elétrica de distribuição devido à utilização de geradores fotovoltaicos." Universidade do Vale do Rio dos Sinos, 2013. http://www.repositorio.jesuita.org.br/handle/UNISINOS/4426.
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Milton Valente
UNISINOS - Universidade do Vale do Rio dos Sinos
Muito tem se falado sobre o uso de fontes alternativas de energia e do uso de pequenas fontes em geração distribuída (GD), especialmente com a nova legislação brasileira que agora considera esta possibilidade. O aproveitamento da energia solar vem crescendo ao longo dos últimos anos, tanto através de seu uso como fonte térmica, quanto através da geração fotovoltaica, baseado no baixo impacto ambiental desta fonte de energia. Este trabalho tem por objetivo estudar o impacto da geração distribuída no sistema de distribuição de energia elétrica pelo uso de geradores fotovoltaicos conectados diretamente à rede de distribuição. O estudo é realizado em regime permanente, sob o ponto de vista elétrico, em um alimentador específico, considerando curvas típicas propostas para dias ensolarados e encobertos. Para esta análise foi utilizada uma base de dados de um ano, com dados de irradiância e de temperatura do ar ambiente coletados na cidade de Porto Alegre - RS entre Julho de 2004 e Junho de 2005. Esta base de dados serviu para estabelecer as curvas típicas de geração de um dia ensolarado e de um dia encoberto, através de uma metodologia desenvolvida. Com o uso destas curvas típicas foi definido o padrão de geração fotovoltaica em um dia ensolarado e em um dia encoberto. Após a definição deste padrão de geração foi possível analisar o impacto em um alimentador específico, localizado na cidade de Viamão - RS. A análise do impacto na rede considerou a influência que a geração distribuída ocasiona nos níveis de tensão nos diferentes nós ao longo do alimentador. Foi considerada uma penetração de 20% de GD, em dois diferentes horários para um dia ensolarado e para um dia encoberto. A potência gerada foi normalizada em relação à potência consumida nos diferentes pontos do alimentador. Os impactos observados na rede de distribuição não foram relevantes, entretanto a geração fotovoltaica contribuiu levemente para a melhora em alguns níveis de tensão que estavam na faixa crítica, em alguns cenários analisados.
Alternative sources of energy and distributed generation (DG) are current subjects, especially in Brazil where the regulations had just changed and now the possibility of DG and compensation of energy can be considered. The use of solar energy has been increased along the last years, thus as a heat source or as photovoltaic (PV) generation, based mainly on the low environmental impact of this energy source. This essay aims to study the impact of distributed generation in the electrical energy distribution system caused by the use of photovoltaic generators connected straight to the distribution grid. The study is done in steady state condition, in a specific feeder, considering typical curves proposed for sunny and cloudy days. A data base of irradiance and temperature of air ambient of one year had been used for this analysis. The data had been collected in the city of Porto Alegre – RS – Brazil, from July 2004 to June 2005. This data base was used to establish the generation typical curves of sunny and cloudy days through a methodology developed. The photovoltaic generation standards for sunny and cloud days had been defined by the use of these typical curves. With these standards were possible to analysis the impact in a specific feeder, located in the city of Viamão – RS – Brazil. The analysis of the impact in the grid considered the influence of distributed generation could cause on voltage levels at different bars along the feeder. It had been considered a penetration of DG of 20%, in two different hourly times for each day, sunny and cloudy typical curves. The power generated had been normalized related to the power consumed in different points of the feeder. The impact observed in the distribution grid is not relevant. However, the distribution generation did contribute to slightly raise some voltage levels that are already among the critical zone, in some of the sets analysed.
Lohrmann, Peter J. "Energy-Efficient Interactive Ray Tracing of Static Scenes on Programmable Mobile GPUs." Digital WPI, 2007. https://digitalcommons.wpi.edu/etd-theses/60.
Full textSantos, Frederico Cassis Ribeiro. "Análise de execução de aplicações paralelas em grades móveis com restrições de processamento e bateria." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-05102016-102814/.
Full textNowadays, there are different proposals to integrate mobile devices in a computational grid, although several problems are introduces. This dissertation focus on the energy limitation problem when using mobile devices to provide resources, such as processing power to run parallel applications. It also proposes a method to estimate energy consumption for a task that needs to be executed in this environment. To achieve this goal two mobile devices were used as a test case and a representation of its energy consumption was created running benchmarks and using regression techniques. To validate the model created, two applications were executed and had the measured values compared to the estimated ones. The estimation showed a raise between 6 and 14.24 percent.
Wistedt, Johan. "Digital secondary substations with auto-configuration of station monitoring through IEC 61850 and CIM." Thesis, Uppsala universitet, Elektricitetslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-360513.
Full textMahmoud, Thair. "Optimal power generation in microgrids using agent-based technology." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2013. https://ro.ecu.edu.au/theses/599.
Full textBaradar, Mohamadreza. "On the Efficiency and Accuracy of Simulation Methods for Optimal Power System Operation : Convex Optimization Models for Power System Analysis, Optimal Utilization of VSC-type DC Wind Farm Grids and FACTS Devices." Doctoral thesis, KTH, Elektriska energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166383.
Full textQC 20150521
Melo, Igor Delgado de. "Estimação de estado harmônico para sistemas radiais de distribuição usando medição fasorial sincronizada." Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/234.
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Este trabalho objetiva apresentar uma metodologia capaz de estimar os componentes harmônicos em sistemas de distribuição com topologia radial utilizando PMUs (Phasor Measurement Units). Os estados a serem estimados serão as correntes passantes em todas as linhas do sistema em coordenadas retangulares. Uma vez que essas correntes são obtidas, torna-se possível o cálculo de outras grandezas elétricas através das equações de fluxo de potência e leis de Kirchhoff. A metodologia considera poucas unidades de medição fasorial (as PMUs) instaladas efetuando a leitura dos sinais de tensões nodais e correntes nas linhas com distorção harmônica. A fim de restaurar a observabilidade do sistema por completo, são considerados dados históricos de demanda de potência ativa/reativa, os quais serão tratados como restrições de desigualdades excursionando entre um valor mínimo e máximo considerados em um problema de otimização não linear que visa diminuir a diferença entre os valores monitorados pelas PMUs e os calculados pela metodologia. As mencionadas restrições permitem ao estimador o acompanhamento das variações sofridas ao longo do tempo na curva de carga para a frequência fundamental e também para as demais frequências. A abordagem proposta neste trabalho considera a modelagem trifásica de equipamentos e linhas de distribuição, portanto, são modelados os efeitos de acoplamento mútuo entre fases e a operação não linear de equipamentos de eletrônica de potência tiristorizados. O método demonstra eficiência não apenas em estimar os componentes harmônicos de um certo espectro considerado no estudo, como também se mostra uma ferramenta prática de detecção e identificação de fontes harmônicas no sistema elétrico de potência, além de explicitar um exemplo prático do uso de PMUs no que tange ao monitoramento de redes de distribuição, carentes de acompanhamento em tempo real. A metodologia ainda se mostra capaz de ser aliada a grandes estudos contextualizados em qualidade de energia, uma vez que permite a estimação de índices de distorção harmônica.
This work aims to present a methodology which is capable of estimating harmonic components for distribution systems with radial topology, using PMUs (Phasor Measurement Units). The estimated states will be all branch currents of the system expressed in rectangular coordinates. Once these currents are obtained, it is possible to calculate other electrical quantities using power flow equations and also Kirchhoff’s law. The methodology considers the installation of a few number of phasor measurement units which will measure voltage and branch currents signals distorted by harmonic sources. In order to make the whole system observable, historical data of active/reactive power demand will be treated as inequality constraints varying between minimum and maximum limits described in a non linear optimization problem, which aims to minimize the difference between the values monitored by PMUs and the ones calculated by the methodology. The already mentioned constraints allows the accompaniment of the variations occured in a typical load curve during a period of time for the fundamental frequency and also for their multiples, allowing the accompaniment of the harmonic load curve, normally unknown. The proposed approach considers a three-phase modelling of equipments and distribution lines, subject to their mutual coupling effects caused by mutual impedances between the lines. It will also be considered electronic-based devices using thyristors located along the distribution feeder, injecting harmonic currents in the system. The method demonstrates efficiency in estimating the harmonic states of the net and also in detecting and identifying harmonic sources in an eletric power system, besides showing a practical use of PMUs for the monitoring of distribution systems, lacking in information and real-time accompaniment. The method also enables the estimation of power quality indicators such as total harmonic distortion.
Herůfek, Radek. "Vliv větrných elekrátren na napěťovou stabilitu v kontinentální Evropě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221337.
Full textFranek, Lešek. "Data koncentrátor pro chytré sítě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219675.
Full textGkikas, Nikolaos. "Data Transfer and Management through the IKAROS framework : Adopting an asynchronous non-blocking event driven approach to implement the Elastic-Transfer's IMAP client-server connection." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166740.
Full textGivet det nuvarande läget för input/output (I/O) och lagringsenheter för system i peta-skala, skulle inkrementella lösningar bli ineffektiva om de implementerades i exa-skalamiljöer. Enligt ”The International Exascale Software Roadmap”, av Dongarra et al., är nuvarande I/O-arkitekturer inte tillräckligt skalbara, särskilt eftersom nuvarande delade filsystem har begränsningar när de används i storskaliga miljöer. Dessa begränsningar är: Bandbredd skalar inte på ett ekonomiskt sätt i storskaliga system, I/O-trafik på höghastighetsnätverk kan ha påverkan på och blir påverkad av andra orelaterade jobb, och I/O-trafik på lagringsservern kan ha påverkan på och bli påverkad av andra orelaterade jobb. Framtida applikationer på exa-skaladatorer kommer kräva I/O-bandbredd proportionellt till deras beräkningskapacitet. För att undvika dessa begränsningar föreslog C. Filippidis, C. Markou och Y. Cotronis ramverket IKAROS. I detta examensarbete utökas funktionaliteten hos den publikt tillgängliga modulen elastic-transfer (eT) som framtagits utifrån IKAROS. Den befintliga versionen av eT-ramverket implementerar Internet Message Access Protocol (IMAP) klient-serverkommunikation genom modulen ”Inbox” från Node Package Manager (NPM) ur Node.js programmeringsspråk. Denna modul användes som ett koncepttest, men i en verklig miljö så underminerar denna implementation systemets skalbarhet när ett stort antal värdar ansluter till systemet. Varje klient begär individuellt information relaterad till systemets metadata från IMAP-servern, vilket leder till en ineffektiv allokering av systemets resurser när ett stort antal värdar är samtidigt anslutna till eT-ramverket. Denna uppsats löser problemet genom att använda ett asynkront, icke-blockerande och händelsedrivet tillvägagångssätt för att implementera en IMAP klient-serveranslutning. Detta görs genom att integrera och modifiera NPM:s ”Imap”-modul, tagen från NPM:s katalog, så att den passar eT-ramverket. Eftersom formatet JavaScript Object Notation (JSON) har blivit ett av de mest spridda formaten för datautbyte så modifieras även eT:s metadata-struktur för att göra systemets metadata enkelt att omvandla till JSON-objekt. Denna funktionalitet ger ett bredare kompatibilitet och interoperabilitet med externa system. Utvärdering och tester av den nya modulens operationella beteende utfördes genom en serie dataöverföringsexperiment i en wide area network-miljö. Dessa experiment genomfördes för att få bekräftat att förändringarna i systemets arkitektur inte påverkade dess prestanda.
Bodin-Deshayes, Claire. "Epitaxie par jets moléculaires d'hétérostructures CdTe-CdMnTe : application aux structures laser et structures piézoélectriques." Grenoble 1, 1993. http://www.theses.fr/1993GRE10139.
Full textLuttmann, Michel. "Ellipsométrie spectroscopique à angle variable : applications à l'étude des propriétés optiques de semi-conducteurs II-VI et à la caractérisation de couches à gradient d'indice." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10232.
Full textKluzová, Ivana. "Návrh soustavy CZT a tepelných zdrojů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378717.
Full textFujdiak, Radek. "Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-358408.
Full textChiu, Chun-ming, and 邱俊銘. "Complementary electrochromic device using metal grid electrode structure." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/nmc68b.
Full text國立中山大學
電機工程學系研究所
103
In this study, the electrodes for the complementary electrochromic device (CECD) were fabricated using cooper, nickel-vanadium and tungsten by pulsed-DC sputtering deposite on and formed the metal grid structure by self-made mask. Then, the electrochromic films of NiO and WO3 were respectively deposited on these electrodes by e-beam evaporation. Finally, these electrodes were applied to CECDs with gel polymer electrolyte. This study sequentially investigated the stability of high-temperature environment and electrochemical circulation, uniformity of the simulated electric field and the effect on the device characteristics with or without metal grid structure. The first part of the experimental results is the characteristics of the metal electrode. When the environment temperature rising to 100 ℃, the sheet resistances of the W, Ni-V and Cu were rised less than 5 %. For the stability of the electrochemical part, the CECD was fabricated with metal electrodes and switched 50 times with ± 1.8 V. The results reveal that the attenuation of the consumed charge of devices with Cu and Ni-V is 14 % and W is the lowest with 8 %. Consequently, the metal W exists the highest electrochemical stability. For the uniformity of the simulated electric field part, the uniformity of the electric field was enhanced by using metal grid structure and the more uniform electric field received by using Cu grid due to its excellent conductivity. For the fabrication and the analysis of CECD, the CECD exhibited better electrochromic characteristics when the applied voltage is 1.8 V. When the applied time of CECD is 60 s, the experiment results (λ@550 nm) show that the transmittance of colored state is 36.17 %, transmittance change (ΔT%) is 36.16 % and the coloration efficiency (η) is 77.92 cm2/C. The CECD using W grid electrode structure (W-CECD) exhibited better electrochromic characteristics when the applied time is 60 s. The experiment results (λ@550 nm) show that the transmittance of colored state is 32.46 %, ΔT% is 39.08 % and η is 81.93 cm2/C. The CECD using Cu grid electrode structure (Cu-CECD) exhibited better electrochromic characteristics when the applied time is 30 s. The experiment results (λ@550 nm) show that the transmittance of colored state is 36.73 %, ΔT% is 36.67 % and η is 29.62 cm2/C. For the response time and the memory effect, the response time of the CECD was found to be about 94 s and the transmittance of colored state increased to 36.35 % after 24 h without biased voltage supply. The response time of the W-CECD was found to be about 98 s and the transmittance of colored state increased to 33.31 % after 24 h without biased voltage supply. The results show that the memory effect was still excellent after using metal grid electrode structure.
"Mobile agents for global mobile device grid infrastructure enterprises." Thesis, 2010. http://hdl.handle.net/10210/3261.
Full textGrid computing is a technology concerned with harvesting idle resources of geographically distributed and interconnected computers. It solves problems regarded as too complex or large to be solved by a single computer. Furthermore, economic grid computing is becoming the most dominant form of grid computing. It enables some form of payment to occur between resource producers and resource consumers in grid computing. Mobile devices and mobile telecommunication services, a relatively new field of technology, are rapidly increasing in popularity, size, strength and application. At the end of 2006, there were approximately 2.7 billion global active mobile users utilising mobile devices and mobile telecommunication services [Aho07]. At the end of 2007 this number had grown to 3.3 billion mobile users, more than half a billion additional mobile users in a period of one year [McN07]. With such large numbers, grid computing can benefit from the clustering of mobile devices forming a mobile grid computing model. However, there are many inherent disadvantages concerning mobile devices, such as low processing capabilities, unpredictable network connections and battery utilisation. Such hurdles must be addressed and solved if a mobile computing infrastructure or architecture is ever to be considered. This dissertation proposes the implementation of an economic mobile computing solution: Mobile Agents for Global Mobile Device Grid Infrastructure Enterprises, or MAGGIE. MAGGIE is concerned with harvesting idle mobile device resources by implementing the supply and demand economic model, aiming to create a healthy competitive economic market environment. MAGGIE implements agent and mobile agent technology to compensate for the hurdles introduced by mobile devices and mobile device software development platforms. It is targeted at both Sun Microsystems’s J2ME MIDP 2.0 and Microsoft’s .NET Compact Framework, enabling lower-end and higher-end mobile devices to contribute mobile computing services and resources for utilisation by other mobile device users. The primary goal of MAGGIE is to produce an architecture as generic as possible regarding the development and implementation of MAGGIE services. MAGGIE allows third-party application developers to seamlessly implement an array of MAGGIE services, without indepth prior knowledge of the architecture and technical aspects of MAGGIE. Finally, MAGGIE’s capabilities are demonstrated by implementing a distributed mobile chess service known as the MAGGIE Chess Service. The MAGGIE Chess Service enables a collection of distributed mobile devices in determining the best move originating from a chessboard position.
"Robust Control of Wide Bandgap Power Electronics Device Enabled Smart Grid." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.46215.
Full textDissertation/Thesis
Doctoral Dissertation Electrical Engineering 2017
Hong, Guan-Qun, and 洪冠群. "DC Power Storage Device and AC Grid-Connected Inverter Design for Wind Energy Systems." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/j28a93.
Full text中原大學
電機工程研究所
99
Wind maximum power tracking with DC power storage and grid connected ability is developed separately in this thesis. In the first part, the DC power storage system regulates the unstable wind energy to a smoother power source in order to store the generated power into the battery stack. Moreover, the power generation is also maximized with a maximum power changer. Then, grid-connected inverter in the second part of this thesis, a current-controlled grid-connected inverter is designed to transfer the wind power energy to the AC utility grid. Furthermore, a maximum power algorithm is developed to increase the power transferred into the utility grid. Based on the current error between the utility-grid current and the maximum power reference current, a Proportional control circuit is used to synchronize and maximize the inverter current to the utility grid. Experimental performance and theoretical analysis are verified through a 400 watt wind turbine simulation platform. From the results, the DC power storage and grid connected systems are not only feasible but also show good results.
Chen, Kuo-Hua, and 陳國華. "Multi-objective Optimization of Flip Chip Ball Grid Array Process Using Embedded Device Substrate." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/25970343355302412722.
Full text國立高雄第一科技大學
機械與自動化工程所
98
SOC (system on chip) and SiP (system in package) are developed for more complex and highly integrated functions in Electronic products. Even though both of them have the common characteristic of significantly reducing the package size and improving the system effectiveness, they still have their own advantages and dis-advantages. In recent years, SOC technology significantly reduces the chip number for chipset, and SiP technology integrates assembly processes for the chipset and passive components. At the moment, the mainstream of the system process technology is still dominated by multi-chips module. The flip-chip packaging technology can reach 10 3 I/O count per square centimeter. However, under the multimode system operations trends, the system process technology has to integrate the electronic circuits and components with a variety of information and communication system standards. Therefore, the I/O density level will not be able to meet the demand by the present technology. The embedded SiP 3D packaging technology development began with active component deposited on the substrate surface and passive components embedded in the substrate. In the advanced SiP 3D technology, the active component is embedded into the substrate, which can significantly shorten the connection path between embedded passive components and active component to enhances RF performance。 The embedded SiP application is majorly for handheld communication equipment system IC. This experiment is related to embedded device substrate application in flip-chip packaging process, especially to the study of improving interface quality between chip and substrate. The problem solving is focusing on packaging materials reorganization with the conditions of flip chip thickness, underfill, solder resist at the production stage. The Taguchi and Principal Component Analysis with Fuzzy theory is used to improve flip-chip packaging quality problems such as open circuit, short circuit and delamination.
Ferreira, João C. "Mobi-System: towards an information system to support sustainable mobility with electric vehicle integration." Doctoral thesis, 2013. http://hdl.handle.net/1822/28871.
Full textThe current Thesis proposes the conceptual aspects and the preliminary prototype of a mobile information system to support information integration and manipulation towards the Electric Vehicle (EV) introduction, and the support of mobility process in urban environments, giving recommendations to drivers about EV range autonomy, charging stations, electricity market, and also as route planner taking into account public transportation, car or bike sharing systems. The main work objective is the creation of an Information and Communication Technology (ICT) platform based on successful approaches developed in the Computer Science Area, recommender systems, cooperative systems and mobile devices, to help the driver of EV by giving real time information related with EV charging process, range autonomy, electricity market participation, and also smart mobility process in cities by giving guidance towards best route options, taking into account time travel and CO2 emissions. Based on the analysis of the problem a conceptual system and a prototype application were created under the designation “Mobi-System”, designed to mobile devices, with relevant information oriented to: (1) EV charging process; (2) EV range autonomy; (3) electricity market participation; and (4) mobility process in smart cities of the future. In this work it was developed an application to store data related with EV charging/discharging process, for further intelligent analysis and remote interaction with the charging system, determining a smart charging procedure, taking into account the distribution electrical system limitations, and the creation of communities with participation in the electricity market. A range estimation and representation process is introduced as part of the help process to assist EV drivers. An Aggregator system and a collaborative broker for distributed energy sources are proposed, taking into account the electricity market. A proposal for data integration of different transportation sources and a multimodal best route path are proposed based on CO2 emissions and time travel.
O presente trabalho consiste na concepção e discussão do sistema Mobi-System, que disponibiliza informação relevante para condutores de veículos elétricos (VE), tendo em conta os problemas dos carregamentos dos VE, a gestão da ansiedade de autonomia (range anxiety) dos condutores, a participação no mercado de energia elétrica, a integração das fontes de energia renováveis, bem como a integração de informação de transportes públicos e a criação de sistemas para gerir o problema da mobilidade sustentável em cidades inteligentes (smart cities). O objectivo principal do trabalho é o uso apropriado de Tecnologia da Informação e Comunicação (TIC) baseada em abordagens bem-sucedidas desenvolvidas na área da informática, como os sistemas de recomendação, sistemas cooperativos e dispositivos móveis para ajudar o condutor de VE, dando informações relevantes em tempo real, orientando o condutor para os pontos de carregamento públicos, ou para o melhor caminho tendo em conta o tempo e as políticas ambientais, nomeadamente as emissões de CO2. Com base na análise do problema, um sistema conceitual e uma aplicação protótipo foram criadas sob a designação de Mobi-System, projetada para dispositivos móveis com informações relevantes orientadas a: (1) processo de carregamento do VE feito num local público com a orientação e a reserva de slots de carregamento, ou em casa com a programação do processo de carregamento lento, tendo em conta limitações de potência; (2) gestão assistida da autonomia dos VE; (3) participação no mercado de energia, pela criação de comunidades de condutores com capacidade de participar no mercado de energia, dado o VE poder atuar como um armazenador de energia; e (4) processo de mobilidade em cidades inteligentes do futuro, com a proposta de integração de dados de diferentes tipos de transporte, com indicação do trajeto de melhor rota multimodal, proposto com base nas emissões de CO2 e no tempo das viagens.