Induction Generator
Mostrando 25-36 de 46 artigos, teses e dissertações.
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25. CONTRIBUIÇÃO AO ESTUDO DA MÁQUINA ASSÍNCRONA TRIFÁSICA DUPLAMENTE ALIMENTADA APLICADA A AEROGERADORES DE VELOCIDADE VARIÁVEL
This work presents the analysis and implementation of a vector control applied to Doubly-Fed Induction Generators (DFIG) used in grid connected wind turbines. DFIGs are nowadays the more widely used concept for grid connected wind turbine, especially for rated power above 1 MW. The main reason is the low rotor PWM power converter rating. The present work dea
Publicado em: 2006
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26. Viabilidade de conjunto motor de induÃÃo e bomba centrÃfuga operando como turbina e gerador para pequenos aproveitamentos de potencial hÃdrico / Viability of induction motor and centrifugal pump group operating as a turbine and generator for small hydric potencials.
RESUMO BARBOSA FERNANDES, Reginaldo. Viabilidade de conjunto motor de induÃÃo e bomba centrÃfuga operando como turbina e gerador para pequenos aproveitamentos de potencial hÃdrico. 2006. 53 p. DissertaÃÃo (Mestrado em MÃquinas e AutomaÃÃo AgrÃcola) â Universidade Federal de Lavras, Lavras, MG.* A demanda por energia elÃtrica no Brasil vem crescen
Publicado em: 2006
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27. Detecção e diagnóstico de falhas em motores de indução
This main purpose of this work is to design and implement a system to detect and diagnose electrical faults (stator inter-turn short circuit and broken rotor bars) and mechanical faults (unbalance and shaft misalignments) for three phase induction machines. This approach starts by obtaining the best patterns for fault detection and symmetrical models for the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/07/2005
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28. WIND TURBINE: MODELING, ANALYSIS AND CONTROL OF DOUBLY FED INDUCTION GENERADOR / TURBINAS EÓLICAS: MODELO, ANÁLISE, E CONTROLE DO GERADOR DE INDUÇÃO COM DUPLA ALIMENTAÇÃO
This thesis presents the main concepts and configurations used in wind turbine connected to the grid, as well as, an analysis, design and implementation of the control system for the Doubly Fed Induction Generator (DFIG). The DFIG has been selected since it is the concept frequently adopted by the wind turbine manufactures. In the thesis, it is presented a m
Publicado em: 2004
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29. Control Strategies for Wind Turbines with Induction Generators / EstratÃgias de controle de sistemas de garaÃÃo eÃlica com mÃquinas de induÃÃo
The perspectives of a great number of accesses of wind turbines to the Brazilian electrical system have stimulated studies on the controls of these generators and the impacts that they will cause in the electrical grid. This two stages work, considered the study of control techniques of induction generators with squirrel cage type or doubly fed, when set in
Publicado em: 2003
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30. Gerador de indução associado a inversor PWM operando com frequencia constante
Some alternatives to the three-phase cage-rotor induction machine application in electric power generation were analyzed in this investigation. The proposed generation systems ensure satisfactory energy quality, as they are able to maintainbalanced three-phase voltage, with sinusoidal waveform and constant frequency at 60Hz. These systems are intended to be
Publicado em: 1999
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31. Contribuição ao estudo da maquina de indução de dupla-alimentação em operação sincrona
The Wound-Rotor Induction Motor opera_es as a DoubIy-Fed Induction Machine when I has been excied by rotor winding in slip frequency. Under speciaI conditions the Machine will run Synchronousl y and rotor speed will be equal to addition or difference between frequencies of stator and rotor. Mathematical modelling of Open-Loop Motor/Load System in State Varia
Publicado em: 1993
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32. Estudo do comportamento de uma usina eletrica isolada com gerador sincrono e gerador de indução
The isolated electrical power plant with synchronous generator and induction generator is studied. The subject is to save money on the initial cost of the power plant necessary to work in distant sites from the main power system. The mathematical model based on electrical machine laboratory experiences were developed and both the steady and transient states
Publicado em: 1992
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33. Um modelo matematico dinamico para estudo da partida de motor de indução alimentado por gerador sincrono isolado
A dynamic mathematical model or a system constituted by direct current motor driven synchronous generator supplying power to a squirrel cage rotor induction motor is presented. The accuracy or the model is appraised using laboratory experiment recuits using above mentioned machines. Squirrel cage rotor induction motor starting supplied by an isolated synchro
Publicado em: 1987
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34. Protein synthesis in bacteriophage ghost-infected cells.
Escherichia coli B infected with T4 phage ghosts at 10 mM Mg2+ regains its protein synthesizing activity upon addition of ATP, GTP, and their generator to approximately 2% of the intact exponentially growing cells. In contrast to amino acid incorporation by intact cells, this system is sensitive to EDTA or low Mg2+. On the other hand, this system, differing
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35. Inhibition of protein synthesis blocks long-term enhancement of generator potentials produced by one-trial in vivo conditioning in Hermissenda.
A one-trial in vivo conditioning procedure produces short- and long-term cellular changes that can be detected in identified sensory neurons of the pathway mediating the conditioned stimulus. The memory of the associative experience in the conditioned stimulus pathway is expressed by short- and long-term enhancement of light-evoked generator potentials recor
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36. NF-kappa B-independent activation of beta-interferon expression in mouse F9 embryonal carcinoma cells.
We have examined the behaviour of the beta-interferon promoter in mouse F9 embryonal carcinoma cells. In undifferentiated cells, the beta-interferon promoter is not responsive to dsRNA or to Sendai virus. In cells stimulated to differentiate into parietal endoderm by treatment with retinoic acid, the beta-interferon promoter responds to both inducers, but on