Electrical Generator
Mostrando 25-36 de 69 artigos, teses e dissertações.
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25. Metodo baseado em logica nebulosa para alocação de geradores distribuidos sob a optica do perfil de tensão / Method based on fuzzy logic for allocating distributed generators from the viewpoint of the voltage profile
This work consists in proposing a methodology based on Fuzzy Logic to obtain an index, which classifies the buses more suitable to install a distributed generator in an electric power distribution system. Themethodologywas developed taking into consideration the difficulty tomaintain a suitable voltage profile in distribution systems, so the methodology resu
Publicado em: 2009
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26. Analise dos sistemas de proteção e controle de instalações industriais com geradores sincronos durante operação ilhada / Protection and control systems analysis of industrial plants with synchronous generators during islanded operation
Modern industrial systems are very sophisticated installations with a high number of automatic processes and capability of isolated (islanded) operation after contingences by using onsite generators composed mainly by synchronous machines and steam turbines. Such installations, in the presence of generators, are generically called autoproducers. Since many o
Publicado em: 2009
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27. AVALIAÇÃO E REFORÇO DAS CONDIÇÕES DE ESTABILIDADE DE TENSÃO EM BARRAS DE TENSÃO CONTROLADA POR GERADORES E COMPENSADORES SÍNCRONOS / VOLTAGE STABILITY ASSESSMENT AND ENHANCEMENT IN VOLTAGE-CONTROLLED BUSES BY SYNCHRONOUS GENERATORS AND COMPENSATORS
After the incidence of some voltage collapses in the energy transmission systems in the world, the voltage security became an issue of great interest in the last years due to the importance of its impact. The phenomenon of voltage stability is due to the excessive active and reactive power flow in the electrical transmission network and has been associated w
Publicado em: 2009
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28. Analysis of wear in organic and sintered friction materials used in small wind energy converters
Wind energy converters of small size used in isolated units to generate electrical energy must present low maintenance cost to such facilities economically viable. The aspect to be analyzed in cost reduction is the brake system, since in isolated systems the use of brake is more frequent reducing the brake pads life time. This study aims at analyzing the wea
Materials Research. Publicado em: 2008-09
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29. Automatic generation and evaluation of transistor networks in different logic styles / Geração automática e avaliação de redes de transistores em diferentes estilos lógicos
Currently, VLSI design has established a dominant role in the electronics industry. Automated tools have enabled designers to manipulate more transistors on a design project and shorten the design cycle. In particular, logic synthesis tools have contributed significantly to reduce the design cycle time. In full-custom designs, manual generation of transistor
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2008
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30. Avaliação da disponibilidade energética em atividade física realizada em bicicleta estacionária
Nowadays, the search of better life quality is related, invariably, to the developed practice of physical activity mainly at gyms. Although in these places, there is considerable expenditure of human energy, they are not characterized as an energy management model that can reflect in considerable economy in monthly electric energy consumption. The conception
Publicado em: 2008
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31. Detecção condutométrica sem contato: uma nova ferramenta para monitoramento de interações biomoleculares em microssistemas analíticos / Contactless conductivity detection: a new tool for monitoring biomolecular interactions on analytical microsystems
The study reported in this thesis shows the application of a capacitively coupled contactless conductivity detection (C4D) for monitoring biomolecular interactions on analytical microsystems. Initially, the analytical performance of the microsystems fabricated in glass, poly(dimethylsiloxane) (PDMS) and polyester-toner (PT) was investigated in order to choos
Publicado em: 2008
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32. Contribuição ao estudo de aerogeradores de velocidade e passo variáveis com gerador duplamente alimentado e sistema de controle difuso / Contribution to the study of fuzzy control applied to variable-speed variable-pitch wind generators with double-fed induction generator
The efficient capture of aeolic-energy occurs by means of three blades turbines with adjustable pitch-angle and angular-speed. The pitch-angle adjustment is utilized to limit the aeolic-energy capture when occur very strong winds and, the angular speed adjustment is utilized to maximize the capture of kinetic energy of weak winds. In this mode of operation t
Publicado em: 2007
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33. Generated voltage variation and permanent magnet magnetic condition analysis. / Análise da variação da tensão gerada e do estado de magnetização em um gerador com ímãs permanentes.
Aiming to analyze the performance of a permanent magnet generator, operating under variable load and quantifying the corresponding condition of its magnets, we have developed a prototype adaptable to wind generators. As one of the purposes of this work is to study the magnetic performance of the permanent magnets in several points of load, we have chosen fer
Publicado em: 2007
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34. Programmable ac power source used to analyse electronic equipment performance in the electrical power system quality concept / Fonte de tensão ca trifásica programável adequada para testes de equipamentos eletrônicos no contexto da qualidade da energia elétrica
Programmable AC Power Source with Low Harmonic Distortion used to analyse equipment performance when the quality of power supply deviates from the ideal standards is, nowadays, quite imperative. In addition to other applications, this allows for the derivation of distinct load sensitivity and supportability limits as far as power quality is concerned. This w
Publicado em: 2007
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35. Exploração de reordenamento de ROBDDs no mapeamento tecnológico de circuitos integrados / Exploration of ROBDD reordering on technology mapping for integrated circuits
The ROBDDs are structures that have been successfully used in CAD tools for microelectronics. These structures allow canonical representation of boolean functions when established a fixed variable ordering. In the context of an automatic logic cell generator for integrated circuits, ROBDDs may serve as a base for deriving transistor networks from which elect
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2007
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36. Programmable ac power source used to analyse electronic equipment performance in the electrical power system quality concept / Fonte de tensÃo ca trifÃsica programÃvel adequada para testes de equipamentos eletrÃnicos no contexto da qualidade da energia elÃtrica
Fontes de tensÃo CA programÃveis que apresentam baixa taxa de distorÃÃo harmÃnica sÃo utilizadas para emular fontes de alimentaÃÃo nÃo ideais com o propÃsito de realizar testes de sensibilidade/suportabilidade em equipamentos eletrÃnicos. Neste sentido, este trabalho apresenta uma nova topologia de amplificador Classe D utilizado para compor o est
Publicado em: 2007