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Dissertations / Theses on the topic 'Voltage profile'

Author: Grafiati
Published: 11 December 2022
Last updated: 31 July 2025

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1

PEREIRA, FELIPE ERNESTO LAMM. "TRANSMISSION CONGESTION ANALYSIS APPLIED ON VOLTAGE SECURITY REINFORCEMENT PROBLEM." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=3953@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Após a incidência de inúmeros colapsos ocorridos nos sistemas de transmissão de energia devido ao uso extremo das linhas de transmissão, a estabilidade, ou mais adequadamente, a segurança de tensão tornou-se um assunto importante ao longo dos últimos anos. Este trabalho foi desenvolvido com o intuito de complementar um método de reforço das condições de estabilidade de tensão. O método consta de ações de controle para diminuir o fluxo de potência ativa no ramo crítico do caminho de transmissão mais carregado associado a um
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2

Shahnia, Farhad. "Analysis and correction of voltage profile in low voltage distribution networks containing photovoltaic cells and electric vehicles." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/50834/1/Farhad_Shahnia_Thesis.pdf.

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Voltage drop and rise at network peak and off–peak periods along with voltage unbalance are the major power quality problems in low voltage distribution networks. Usually, the utilities try to use adjusting the transformer tap changers as a solution for the voltage drop. They also try to distribute the loads equally as a solution for network voltage unbalance problem. On the other hand, the ever increasing energy demand, along with the necessity of cost reduction and higher reliability requirements, are driving the modern power systems towards Distributed Generation (DG) units. This can be in
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3

BIANCO, ANDRE. "MODAL ANALYSIS AND CONTINUATION PAWER FLOW IN THE VOLTAGE STABILITY PROBLEM." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1994. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9042@1.

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CENTRO DE PESQUISA DE ENERGIA ELÉTRICA<br>A estabilidade de tensão tornou-se nos últimos anos tema de intensa pesquisa, envolvendo principalmente a identificação da natureza do problema e a busca de estratégias mais favoráveis para a operação e planejamento dos sistemas de potência. Este trabalho apresenta um relato da evolução da análise do fenômeno sendo, posteriormente descritos os detalhes de sua abordagem através da teoria das bifurcações em sistemas dinâmicos não-lineares. São caracterizados o limite de transmissão de potência à estabilidade de tensão e a geometria das trajetór
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Jain, Akshay Kumar. "Enhancing PV Hosting Capacity of Distribution Feeders using Voltage Profile Design." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/82481.

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Distribution feeders form the last leg of the bulk power system and have the responsibility of providing reliable power to the customers. These feeders experience voltage drops due to a combination of feeder length, load distribution, and other factors. Traditionally, voltage drop was a major concern. Now, due to an ever-increasing PV penetration, overvoltage has also become a major concern. This limits the amount of solar PV that may be integrated. Few solutions exist to improve the voltage profile, where the most common is the use of voltage control devices like shunt capacitors and voltag
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Mohammed, Mahmoud M. Jr. "Development of intelligent systems for evaluating voltage profile and collapse under contingency operation." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/8408.

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Doctor of Philosophy<br>Department of Electrical and Computer Engineering<br>Shelli K. Starrett<br>Monitoring and control of modern power systems have become very complex tasks due to the interconnection of power grids. These large-scale power grids confront system operators with a huge set of system inputs and control parameters. This work develops and compares intelligent systems-based algorithms which may be considered by power system operators or planners to help manage, process, and evaluate large amounts of data due to varying conditions within the system. The methods can be used to p
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Evrenosoglu, Cansin Yaman. "Novel techniques for fault location, voltage profile calculation and visualization of transients." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1103.

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7

TRAVASSOS, ROGERIO. "VOLTAGE PROFILE CORRECTION THROUGH A POWER FLOW ALGORITHM WITH REACTIVE IMPLICIT COUPLING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1992. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9043@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Esta dissertação apresenta uma metodologia para a correção do perfil de tensão dos barramentos de um sistema elétrico de potência. Esta correção corresponde a um redespacho de potência reativa efetuada através de mudança das tensões-base nas barras com geração variável de potência reativa, da mudança dos tapes dos transformadores, e do chaveamento de bancos de capacitores/reatores em paralelo. O método consiste na resolução da equações nodais não lineares de fluxo de carga e das equações associadas aos limites violados. I
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8

SOTOMAYOR, JAVIER ORTEGA. "INTERDEPENDENCE OF VOLTAGE CONTROL EQUIPMENTS: COHERENCY ASSESSMENT IN THE POWER FLOW PROBLEM." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=20273@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Com o aumento do número de dispositivos de controle representados nos casos práticos, pode ser verificado o aparecimento de interações entre suas ações de controle. Quando estas interações não são coordenadas podem ocasionar a diminuição da eficiência do método de Newton-Raphson no problema de fluxo de potência, resultando em convergências lentas e frequentemente soluções oscilatórias ou até mesmo a divergência do
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Oluwole, Osaloni Oluwafunso. "Optimal allocation of distributed generation for power loss reduction and voltage profile improvement." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20578.

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Distributed generation (DG) integration in a distribution system has increased to high penetration levels. There is a need to improve technical benefits of DG integration by optimal allocation in a power system network. These benefits include electrical power losses reduction and voltage profile improvement. Optimal DG location and sizing in a power system distribution network with the aim of reducing system power losses and improving the voltage profile still remain a major problem. Though much research has been done on optimal DG location and sizing in a power system distribution network wi
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10

Gcwabaza, Thabo. "Scanning probe microscopy and oxidation of silicon at breakdown voltages." Huntington, WV : [Marshall University Libraries], 2006. http://www.marshall.edu/etd/descript.asp?ref=722.

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11

Schmidt, Hernan Prieto. "Analysis of the voltage stability problem in electric power systems using artificial neural networks." Thesis, Queen Mary, University of London, 1994. http://qmro.qmul.ac.uk/xmlui/handle/123456789/28952.

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The voltage stability problem in electric power systems is concerned with the analysis of events and mechanisms that can lead a system into inadmissible operating conditions from the voltage viewpoint. In the worst case, total collapse of the system may result, with disastrous consequences for both electricity utilities and customers. The analysis of this problem has become an important area of research over the past decade due to some instances of voltage collapse that have occurred in electric systems throughout the world. This work addresses the voltage stability problem within the framewor
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Das, Choton Kanti. "Smart management strategies of utility-scale energy storage systems in power networks." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2019. https://ro.ecu.edu.au/theses/2209.

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Power systems are presently experiencing a period of rapid change driven by various interrelated issues, e.g., integration of renewables, demand management, power congestion, power quality requirements, and frequency regulation. Although the deployment of Energy Storage Systems (ESSs) has been shown to provide effective solutions to many of these issues, misplacement or non-optimal sizing of these systems can adversely affect network performance. This present research has revealed some novel working strategies for optimal allocation and sizing of utility-scale ESSs to address some important is
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Nilsson, Jim, and Peter Valtersson. "Machine Vision Inspection of the Lapping Process in the Production of Mass Impregnated High Voltage Cables." Thesis, Blekinge Tekniska Högskola, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-16707.

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Background. Mass impregnated high voltage cables are used in, for example, submarine electric power transmission. One of the production steps of such cables is the lapping process in which several hundred layers of special purpose paper are wrapped around the conductor of the cable. It is important for the mechanical and electrical properties of the finished cable that the paper is applied correctly, however there currently exists no reliable way of continuously ensuring that the paper is applied correctly. Objective. The objective of this thesis is to develop a prototype of a cost-effective m
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14

Zhou, Tong, Haiyang Tang, Ying Han, et al. "Expression profile of mitochondrial voltage-dependent anion channel-1 (VDAC1) influenced genes is associated with pulmonary hypertension." KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY, 2017. http://hdl.handle.net/10150/624396.

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Several human diseases have been associated with mitochondria! voltage-dependent anion channel-1 (VDAC1) due to its role in calcium ion transportation and apoptosis. Recent studies suggest that VDAC1 may interact with endothelium-dependent nitric oxide synthase (eNOS). Decreased VDAC1 expression may limit the physical interaction between VDAC1 and eNOS and thus impair nitric oxide production, leading to cardiovascular diseases, including pulmonary arterial hypertension (PAH). In this report, we conducted meta-analysis of genome-wide expression data to identify VDAC1 influenced genes implicated
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Han, Xue. "Quantitative Analysis of Distributed Energy Resources in Future Distribution Networks." Thesis, KTH, Industriella informations- och styrsystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98484.

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There has been a large body of statements claiming that the large scale deployment of Distributed Energy Resources (DERs) will eventually reshape the future distribution grid operation in numerous ways. However, there is a lack of evidence specifying to what extent the power system operation will be alternated. In this project, quantitative results in terms of how the future distribution grid will be changed by the deployment of distributed generation, active demand and electric vehicles, are presented. The quantitative analysis is based on the conditions for both a radial and a meshed distrib
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Raguet, Hugo. "A Signal Processing Approach to Voltage-Sensitive Dye Optical Imaging." Thesis, Paris 9, 2014. http://www.theses.fr/2014PA090031/document.

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L’imagerie optique par colorant potentiométrique est une méthode d’enregistrement de l’activité corticale prometteuse, mais dont le potentiel réel est limité par la présence d’artefacts et d’interférences dans les acquisitions. À partir de modèles existant dans la littérature, nous proposons un modèle génératif du signal basé sur un mélange additif de composantes, chacune contrainte dans une union d’espaces linéaires déterminés par son origine biophysique. Motivés par le problème de séparation de composantes qui en découle, qui est un problème inverse linéaire sous-déterminé, nous développons
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Krishnan, Bharat. "DEVELOPMENT OF SIMULATION FRAMEWORK FOR THE ANALYSIS OF NON-IDEAL EFFECTS IN DOPING PROFILE MEASUREMENT USING CAPACITANCE ? VOLTAGE TECHNIQUE." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082005-092339/.

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Silicon Carbide devices are proving to be most promising for high power and high-temperature application in recent times. Efficient and accurate characterization of the device characteristics is key to the fabrication of high quality devices and reproduction of the quality of the devices fabricated. Capacitance-Voltage profiling is one of the most commonly used techniques to measure the doping profiles of semiconductors. However, interpretation of C-V profiling in the presence of traps in the material becomes complicated. Various complications arising from compensation between donors and accep
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Kabir, Md Nayim. "Smart coordinated distribution system control to enable high level penetration of rooftop PVs." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/79956/1/MD%20Nayim_Kabir_Thesis.pdf.

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This thesis addresses voltage violation problem, the most critical issue associated with high level penetration of photovoltaic (PV) in electricity distribution network. A coordinated control algorithm using the reactive power from PV inverter and integrated battery energy storage has been developed and investigated in different network scenarios in the thesis. Probable variations associated with solar generation, end-user participation and network parameters are also considered. Furthermore, a unified data model and well-defined communication protocol to ensure the smooth coordination between
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Bedoya, Bedoya Duvier Rolando. "Obtenção da margem minima de estabilidade de tensão de sistemas eletricos de potencia." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/262020.

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Orientadores: Carlos Alberto de Castro Junior, Luiz Carlos Pereira da Silva<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-08T23:29:31Z (GMT). No. of bitstreams: 1 BedoyaBedoya_DuvierRolando_M.pdf: 801505 bytes, checksum: 8566b9558e25c36e418f2d8d82398e68 (MD5) Previous issue date: 2007<br>Resumo: Este trabalho apresenta uma nova e rápida metodologia para calcular a margem mínima de estabilidade de tensão de sistemas de potência. O cálculo da margem de estabilidade de tensão (MET) é normalm
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Sherkat, Masoum Amir. "Online Coordinated Charging of Plug-In Electric Vehicles in Smart Grid to Minimize Cost of Generating Energy and Improve Voltage Profile." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/80607.

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This Ph.D. research highlights the negative impacts of random vehicle charging on power grid and proposes four practical PEV coordinated charging strategies that reduce network and generation costs by integrating renewable energy resources and real-time pricing while considering utility constraints and consumer concerns.
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Ferreira, Adriana Scheffer Quintela. "Estrategias de controle preventivo para a manutenção de margens de segurança com relação a estabilidade de tensão em tempo real." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260657.

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Orientador: Carlos Alberto de Castro Junior<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-07T10:41:53Z (GMT). No. of bitstreams: 1 Ferreira_AdrianaSchefferQuintela_D.pdf: 931902 bytes, checksum: 723b5bb5e37c4be6978b9a1ba3d8572c (MD5) Previous issue date: 2006<br>Resumo: O problema de estabilidade de tensão tem recebido uma atenção crescente dos profissionais que atuam na área de análise e operação de sistemas de potência. O aumento das interligações aliado a operação das redes com altos níveis
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Cunha, Andrea da Silva. "De volta às aulas: o cotidiano de professoras-estudantes do PROLE - história/UFBA (2004-2007)." reponame:Repositório Institucional da UFBA, 2009. http://www.repositorio.ufba.br/ri/handle/ri/6375.

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Submitted by Rangel Sousa Jamile Kelly (jamile.kelly@ufba.br) on 2012-07-07T13:48:42Z No. of bitstreams: 1 dissertação final.pdf: 438290 bytes, checksum: e53c096ea12c0636ab7e0f018bf9864d (MD5)<br>Made available in DSpace on 2012-07-07T13:48:42Z (GMT). No. of bitstreams: 1 dissertação final.pdf: 438290 bytes, checksum: e53c096ea12c0636ab7e0f018bf9864d (MD5)<br>Esta dissertação analisa, a partir de uma perspectiva de gênero, a dinâmica particular das relações de trabalho, estudo e maternidade, bem como as repercussões físicas e psicossociais do conjunto dessas atividades, na vida profission
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Weerasinghe, Hasitha C. "Electrical characterization of metal-to-insulator transition in iron silicide thin films on sillicone substrates." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001677.

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Santos, Felipe Santana. "Planejamento integrado de filtros harmônicos e reguladores de tensão em sistemas de distribuição utilizando um algoritmo multiobjetivo." Universidade Federal de Sergipe, 2017. https://ri.ufs.br/handle/riufs/5040.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The increase in linear and non-linear loads experienced by Brazil in recent years has changed the way distribution networks are planned and Operated. In addition, the competitiveness of the market and the demand for the improvement in power quality indexes mean that current e orts are increasingly focused on areas such as voltage profile control and voltage harmonic distortion control. This work deals, exactly, with the Integrated control of voltage and harmonic voltage distortion (volt/thd) in distribution systems, wi
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Lhost, Claudine. "The ‘Problem of Evil’ in the context of the French enlightenment: Bayle, Leibniz, Voltaire, de Sade." Thesis, Lhost, Claudine (2012) The ‘Problem of Evil’ in the context of the French enlightenment: Bayle, Leibniz, Voltaire, de Sade. PhD thesis, Murdoch University, 2012. https://researchrepository.murdoch.edu.au/id/eprint/15473/.

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The ‘problem of evil’ in its most general form concerns the question of the consistency of the mere existence of ‘evil’ in the created world with the characteristics attributed to its creator. Theists recognize this problem, and every major religion has produced a theodicy, ‐from the Greek theos (God) and dikē (justice)‐, the technical term for the attempt to understand and reconcile the relationship of God to a cosmos that comprises ‘physical, and moral evil,’ and thereby to justify the ways of God to humans. The decades preceding and following the beginning of the eighteenth century saw the
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Canoas, Ana Carolina Garcia. "Logica nebulosa e tecnica de otimização particle swarm aplicados ao controle de tensão e de potencia reativa." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260661.

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Orientador: Carlos Alberto Favarin Murari<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-11T08:34:49Z (GMT). No. of bitstreams: 1 Canoas_AnaCarolinaGarcia_D.pdf: 790052 bytes, checksum: bdc65cd1e622b5ffa74f95691e03751e (MD5) Previous issue date: 2008<br>Resumo: Devido ao crescente aumento da demanda de energia elétrica e ao retardo de investimento na expansão dos sistemas e energia elétrica (SEE), a operação destes sistemas está cada vez mais próxima de seus limites operacionais, contribuindo pa
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CUNHA, Annielli Araújo Rangel. "Proposta de construção e validação de mapas cognitivos voltada à estruturação de problemas para decisões em grupo." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18797.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2017-05-16T12:54:11Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese Annielli Final Eng Produção.pdf: 1814655 bytes, checksum: dd58ccbb6433d83fe5fa716f0ccb14ea (MD5)<br>Made available in DSpace on 2017-05-16T12:54:11Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese Annielli Final Eng Produção.pdf: 1814655 bytes, checksum: dd58ccbb6433d83fe5fa716f0ccb14ea (MD5) Previous issue date: 2016-05-25<br>Os métodos de est
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Pflugradt, Noah Daniel. "Modellierung von Wasser und Energieverbräuchen in Haushalten." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-209036.

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In dieser Arbeit wird ein Modell für die Simulation des Verbraucherverhaltens in Haushalten entwickelt. Das Ziel ist die Erstellung von Lastprofilen für den Strom- und Wasserverbrauch. Das Modell wird in einem Programm implementiert. Die Ergebnisse werden anschließend validiert und verschiedene Kenngrößen mit Literaturwerten verglichen. Abschließend wird eine Parameterstudie durchgeführt, um den Einfluss verschiedener Faktoren wie z.B. das Arbeitszeitmodell oder die Feiertagsmodellierung auf Lastprofile zu quantifizieren. Das Modell basiert auf einem Bedürfnismodell aus der Psychologie und erm
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Hou, Dongbin. "Very High Frequency Integrated POL for CPUs." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/77608.

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Point-of-load (POL) converters are used extensively in IT products. Every piece of the integrated circuit (IC) is powered by a point-of-load (POL) converter, where the proximity of the power supply to the load is very critical in terms of transient performance and efficiency. A compact POL converter with high power density is desired because of current trends toward reducing the size and increasing functionalities of all forms of IT products and portable electronics. To improve the power density, a 3D integrated POL module has been successfully demonstrated at the Center for Power Electronic S
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Mess, Francis McCarthy. "A Novel Sensor to Monitor Surface Charge Interactions: The Optically Stimulated Contact Potential Difference Probe." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10460.

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This study addresses the development of a sensor to monitor chemical adsorption and charge transfer processes on a surface using a contact potential difference probe (CPD). The current investigation is an outgrowth of ongoing research on non-vibrating CPD probes (nvCPD) which led to the recent development of a novel measurement technique utilizing optical stimulation: optically stimulated CPD (osCPD). Primary outcomes of this thesis are the theoretical modeling, fabrication and demonstration of a functional osCPD sensor. The research also involved significant engineering and experimentatio
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Leone, Filho Marcos de Almeida. "Uma metodologia baseada em algoritmos genéticos para melhorar o perfil de tensão diário de sistemas de potência = A genetic-algorithm-based methodology for improving daily voltage profile of power systems." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261162.

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Orientador: Takaaki Ohishi<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-21T06:33:46Z (GMT). No. of bitstreams: 1 LeoneFilho_MarcosdeAlmeida_D.pdf: 4843918 bytes, checksum: 9350da4d7c5f9bb7cb858c5d09a0d150 (MD5) Previous issue date: 2012<br>Resumo: A principal contribuição desta tese é a proposta de uma metodologia juntamente com a implementação de um sistema de suporte à decisão para dar subsídio à programação diária de sistemas de potência. Basicamente, a metodologia implementada neste trabal
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Pyekh, Yury B. "Dynamic terrain following: nvCPD scanning technique improvement." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34826.

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There is a large number of measurement techniques that is used for a surface inspection and a characterization of different types of materials. One of these techniques is a contact potential difference (CPD) scanning technique. In this project a non-vibrating contact potential difference (nvCPD) method is utilized to measure a work function and a topographical structure of a sample surface. A sample is mounted on a spindle that rotates at high speed. A nvCPD sensor detects work-function variations during movement above the sample surface. There are certain factors that create difficulties duri
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Cassell, Ryan T. "Synthesis of a PbTx-2 photoaffinity and fluorescent probe and an alternative synthetic route to photoaffinity probes." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1612.

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A natural phenomenon characterized by dense aggregations of unicellular photosynthetic marine organisms has been termed colloquially as red tides because of the vivid discoloration of the water. The dinoflagellate Karenia brevis is the cause of the Florida red tide bloom. K. brevis produces the brevetoxins, a potent suite of neurotoxins responsible for substantial amounts of marine mammal and fish mortalities. When consumed by humans, the toxin causes Neurotoxic Shellfish Poisoning (NSP). The native function of brevetoxin within the organism has remained mysterious since its discovery. There i
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Zeferino, Cristiane Lionço. "Avaliação e controle de margem de carregamento em sistemas elétricos de potência." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-05052011-091651/.

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Neste trabalho é proposta a determinação do ponto de Máximo Carregamento (PMC) em sistemas elétricos de potência por meio do método da Função Lagrangiana Barreira Modificada (FLBM), uma variante do método de Pontos Interiores (PI). Também por meio do método da FLBM, busca-se determinar qual é a barra, para cada sistema, que apresenta a maior sensibilidade em relação ao fator de carregamento, ou seja, qual seria a primeira barra que deveria sofrer corte de carga a fim de aumentar a margem de carregamento do sistema e, assim, evitar o colapso de tensão. Para comprovação dos resultados obtidos po
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Zerweck-Trogisch, Ulrich. "Auflösungsvermögen und Genauigkeit der Kelvinsonden-Rasterkraftmikroskopie und deren Anwendung an molekularen Systemen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1196782873906-79057.

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Die Arbeit befasst sich mit der Erforschung und Anwendung der Kelvinsonden-Rasterkraftmikroskopie. Die Technik wird bezüglich der Quantität der gemessenen Werte und der erzielbaren lateralen Auflösung untersucht und auf diverse Probensysteme angewandt. Die so erhaltenen nanoskopischen Werte werden mit markoskopischen Messergebnissen verglichen. Sowohl die elektrostatische Kraft zwischen der Messspitze und der Probenoberfläche als auch deren Gradienten können zur Minimierung der elektrostatischen Wechselwirkung herangezogen werden. Die Detektion des Kraftgradienten zum Aufbau eines Regelkreises
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Sanetrníková, Dominika. "Studium vlastností membránového napěťového senzoru ASAP1 exprimovaného v buněčné linii HEK 293." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241964.

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In the beginning of this thesis is a short introduction into plasmid DNA which is in the form of a vector used in molecular biology. Plasmids can be used in the form of fluorescent probes to measure changes in membrane potential. Into their structure is added a dye called fluorophore. As an important representative of this thesis is a fluorescent probe ASAP1 which contains green fluorescent protein whose response to the membrane potential change is the decrease in the intensity of emitted light. The aim of this thesis was to make chemical transfection of this plasmid into the HEK293 cell line
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Watt, Andrew. "Fringe Field Corrections in nvCPD Probe Tip Applications." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5090.

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This thesis addresses the fabrication, evaluation, and analysis of the probe tip of a non-vibrating contact potential difference sensor. The non-vibrating contact potential difference (nvCPD) probe measures the work function variation on a conducting surface and recent experiments performed to measure the size of surface features have shown poor correlation between actual and calculated probe tip dimensions. In order to address this deficiency, experiments were done and an analytical model was developed, including fringe electrical fields, that predicts the shape of the nvCPD probe signal as a
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Marchat, Clément. "Caractérisation électrique et optoélectronique de nouveaux matériaux et composants photovoltaïques à partir de techniques AFM." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS094.

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Cette thèse s’intéresse à la caractérisation des propriétés électriques des dispositifs photovoltaïques (PV) par deux techniques de microscopie à sonde locale : la microscopie à force atomique à pointe conductrice (c-AFM) et la microscopie à sonde de Kelvin (KPFM). Elle commence par une étude sur le silicium cristallin, et plus spécifiquement sur l’influence des états de surface sur la mesure KPFM. Cette dernière a été réalisée à l’obscurité et sous éclairement dans le but d’extraire le photovoltage de surface (SPV). Cette étude expérimentale a été complétée avec de la simulation numérique. Da
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Bastos, Camila Bianka Silva. "Estudo dos impactos de um sistema fotovoltaico conectado à rede elétrica utilizando análises QSTS." Universidade do Estado de Santa Catarina, 2015. http://tede.udesc.br/handle/handle/2081.

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Made available in DSpace on 2016-12-12T20:27:38Z (GMT). No. of bitstreams: 1 Camila Bianka Silva Bastos.pdf: 1963598 bytes, checksum: bee88eacc3f6e3c327425297316a691d (MD5) Previous issue date: 2015-02-27<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This dissertation presents a study of the operation of two different three-phase grid-connected test-grids with the connection of a 1MWp photovoltaic system. Two analysis methods are used to evaluate the impacts of this photovoltaic systeM, these methods being conventional static analysis and the analysis known as Quasi-Stati
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Nguyen, The Cong. "Recherche par voie analytique et par simulation numérique des surtensions engendrées lors de la mise sous tension de lignes de transport d'énergie chargées par un transformateur à vide." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0089.

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Cette thèse traite de l'étude analytique et numérique des surtensions de manoeuvre d'un réseau électrique comportant un transformateur à vide raccordé à l'extrémité d'une ligne de transport. Ce traitement permet d'établir des règles aussi simples que possibles pour identifier et éviter des manoeuvres dangereuses, lorsqu'il s'agit par exemple de remettre sous tension un réseau à l'issue d'un incident. Dans une première partie, une analyse de l'ensemble des surtensions de manoeuvre sur la ligne à vide est rappelée, puis une extension du problème avec transformateur à vide à son extrémité est con
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Brut, Hugues. "Contribution à la modélisation et à l'extraction des paramètres de tension de seuil, de résistance série et de réduction de longueur dans les transistors MOS submicroniques." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0192.

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La conception des circuits integres a l'aide de simulateurs de type spice, necessite l'elaboration de modeles physiques, precis et simples. Pour cela, une bonne comprehension du comportement des dispositifs est indispensable. Par ailleurs la reduction constante des dimensions de ces dispositifs entraine l'apparition de nouveaux phenomenes physiques qu'il est primordial d'isoler et de caracteriser d'un point de vue experimental, afin d'en faire une modelisation aussi proche que possible de la realite. C'est dans ce cadre de recherche que s'inscrit ce memoire. Les dispositifs etudies ici sont le
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Svoboda, Lukáš. "Monitorování dynamických soustav s využitím piezoelektrických senzorů vibrací." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-432742.

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The aim of this diploma thesis is to describe localization and calculation load identification of dynamic systems using piezoelectric sensors. Finding methods, which would allow us to evaluate loads on simple systems is the key to their application in the structural health monitoring of more complex systems. A theory necessary for understanding and application in aerospace, civil engineering, automobile industry, and train traffic of presented methods is given in the first part of the thesis. In these applications, the methods of wave propagation and different types of neural network methods a
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Bair, Yih-Her, and 白義和. "Capacitor Installation and Voltage Forecast for Distribution Optimal Voltage Profile." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/65qh67.

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碩士<br>國立臺北科技大學<br>電機工程系所<br>95<br>The reactive power and the operation voltage of the power system are important to TPC’s Utilities operates. To maintain each node voltage of the distribution feeder as the system voltage which is also permitted in the range of the control goal, and to make the loss cost of the distribution line be minimized, lots of research recently probe about optimization. The Taiwan electricity industry law stipulates the permission range of the voltage deviation in TPC power system which is ±5% to the electric light and ±10% to the electricity. The voltage profile is main
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Shen, Ya-Feng, and 沈雅楓. "Solving Voltage Island Problem with Interconnection Delay Consideration." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/90047728617570574209.

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碩士<br>逢甲大學<br>資訊工程所<br>96<br>Since fabrication becomes more complex, the problem of power consumption reduction becomes an important issue. In this paper, we will explore voltage assignment problem with interconnection delay consideration because a large proportion of total delay comes from the interconnection delay in modern fabrication process. This paper has four phases: (1.) find a floorplan using Parquet [12], (2.) determine the initial voltage assignment by a dynamic programming algorithm, (3.) locally reassign the voltage of some blocks to decrease the number of voltage islands, and (4.
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Chessmore, David Timothy. "Voltage profile estimation and reactive power control of distribution feeders." 2008. http://hdl.handle.net/10106/975.

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Tseng, Chin-Chun, and 曾錦淳. "Analysis of Voltage Collapse Problem for an Island Power System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/367wsz.

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碩士<br>中原大學<br>電機工程研究所<br>106<br>In the future, a large amount of renewable energies will be added to the power system. It may cause a blackout in Taiwan, which will lead to an increase in the instability of the power system. However the change of climate and significant increase in electricity consumption of people, cause that the originally stable power system illuminates red light. Because the load is constantly increasing, and the shortage of reserve capacity is faced, and the construction of a new power plant is not easy, resulting in the possibility of insufficient power supply. If the lo
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Chan, YuanFa, and 詹雲發. "Impact of FACTS on Static Voltage Stability Problem in Electrical Power Systems." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/31378167844264729378.

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碩士<br>長庚大學<br>電機工程研究所<br>87<br>Recently voltage collapse phenomena have been experienced worldwidely. To find a reliable and efficient voltage stability index for on—line applications has become an active research area during the past decade and several voltage stability indices have been proposed. This thesis proves the equivalence of tangent vector index and test function in existent performance indices. This thesis also presents a more efficient method to calculate the voltage stability index. A distinguishing feature of this new method is that the voltage stability index can directly obtai
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Chu, Tsung-Hsien, and 朱宗賢. "An Optimal Solution for the Heterogeneous Multi-processor Single-level Voltage Setup Problem." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/72251973646338623284.

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博士<br>國立清華大學<br>資訊工程學系<br>98<br>A heterogeneous multi-processor (HeMP) system consists of several heterogeneous processors, each of which is specially designed to deliver the best energy-saving performance for a particular category of applications. A low power real-time scheduling algorithm is required to schedule tasks on such a system to minimize its energy consumption and complete all tasks by their deadlines. Existing works assume that processor speeds are known as a priori and cannot deliver the optimal energy-saving performance. The problem of determining the optimal voltage for each pro
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HUANG, SHIH-CHIEH, and 黃世傑. "A Case Study of Voltage Sag Problem Improvement for The High-Tech Factory." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/93511334662760926418.

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碩士<br>中原大學<br>電機工程研究所<br>103<br>The voltage sag issue in an 8〞- semiconductor factory (Factory A) operated for eighteen years are discussed in this report . The factory at each time of voltage sag is about 2500 NT$ during 2011-14. Factory A is located in the mixed residential and commercial area；this district is not for the semiconductor factory’s exclusive use. Thus, it has risk on the reliability of power supply .While building the factory, the factory owner purchased lot of second-hand equipments, which results in the diversity of devices’ rated voltage , having not considered the rated vol
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Chang, Yung-Shi, and 張永錫. "Integration of OMS Feeder Network Modeling and Distribution Power Flow for Voltage Profile Improvement." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/6qd22k.

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碩士<br>國立臺北科技大學<br>自動化科技研究所<br>98<br>Automatic data extraction system is developed in this thesis. By using the electric connectivity provided by the Outage Management System (OMS) and related tables and attributes of lines, switches and loads in distribution feeder, operating data can be extracted. The feeder structure can be re-built based on the extracted information. The information of conductor lengths, loads and other related line parameters are calculated. Meanwhile, the operating voltage, current, real power and reactive power of each hour in the Distribution Dispatch Control System (
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