Active Power Flow Control
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. 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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2. Uma contribuição à alocação de geração distribuída, a inserção de PCHs com máquinas síncronas nos sistemas rurais de média tensão
The present work is about an analysis in the domain of distributed generation (DG) allocation in rural distribution systems; the study takes into account the synchronous machines. In such a way, it was possible to research several impacts caused by DG in distribution systems, such as: the rotor angle stability problem under small disturbances; increase of vo
Publicado em: 2009
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3. Modelagem e análise de desempenho dinâmico de complexos elétricos contendo centrais eólicas dotadas de geradores síncronos / Modeling and dynamic performance analysis of electric power systems containing wind installations equipped with synchronous generators
New generation resources, with low implantation and operation costs and that provoke the minimum possible impact to the environment, are undoubtedly focuses of attention to all the segments of the society. From this common sense, the alternative or renewable sources of energy, and particularly the wind, have certainly had a significant penetration in the com
Publicado em: 2007
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4. Modelagem e anÃlise de desempenho dinÃmico de complexos elÃtricos contendo centrais eÃlicas dotadas de geradores sÃncronos / Modeling and dynamic performance analysis of electric power systems containing wind installations equipped with synchronous generators
New generation resources, with low implantation and operation costs and that provoke the minimum possible impact to the environment, are undoubtedly focuses of attention to all the segments of the society. From this common sense, the alternative or renewable sources of energy, and particularly the wind, have certainly had a significant penetration in the com
Publicado em: 2007
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5. COMPARATIVE ANALYSIS BETWEEN THE MAXIMIZATION OF VOLTAGE STABILITY MARGIN AND LOSS REDUCTION IN DISTRIBUTION SYSTEMS / ANÁLISE COMPARATIVA ENTRE A MAXIMIZAÇÃO DA MARGEM DE POTÊNCIA E MINIMIZAÇÃO DAS PERDAS TÉCNICAS EM SISTEMAS DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA
The increase of the consumption of electric energy takes the distribution systems to operate next to its limits, which might cause situation of maximum active and reactive power flow in the branches, that is, problems of voltage stability. The change of the topology of the network allows to find a configuration where de voltage stability indexes are far from
Publicado em: 2007
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6. Distribution system FACTS (flexible AC transmission systems) application - performance simulation. / Aplicação do dispositivo FACTS (Flexible AC Transmission Systems) em sistema de distribuição -simulação de desempenho.
The new FACTS technologies applied to the transmission system, based on power electronics, can also be useful to the distribution. For that, it is necessary to drive a procedure to consolidate the use and the performance for their application without risks. In this work two aspects will be approached. The first refers to the application of a FACTS device act
Publicado em: 2006
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7. Controle e integração de centrais eólicas à rede elétrica com geradores de indução duplamente alimentados. / Control and integration of wind farms to the power grid using doubly fed induction generators.
This Thesis presents the control and integration of wind farms to the interconnected power grid, using doubly fed induction generators (DFIG). The main objective of the present Thesis was to develop discrete control strategies for the wind generation system, with the goal to reduce the wind variations impacts in the grid power quality. The design technique s
Publicado em: 2006
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8. Transient convective heat transfer
In nature, as well as within the human-made thermal systems, the time-variable regimes are more commonly encountered, if not always, than the permanent regimes. Nevertheless, studies in convection are still more frequent in the permanent regimes, undoubtedly due to the related difficulties in calculation in terms of time and cost of computation. One may dist
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-03
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9. 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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10. VOLTAGE STABILITY REINFORCEMENT ON ELETRIC POWER SYSTEMS / REFORÇO DAS CONDIÇÕES DE ESTABILIDADE DE TENSÃO NA OPERAÇÃO DO SISTEMA ELÉTRICO
As the electric power transmission networks became more interconnected, the thermal limits of lines and transformers restrict less the power transmission. Similarly, the use of static systems of reactive power compensation increases the power transmission capacity in systems whereas before they were limited by problems of angular stability. Actually, transmi
Publicado em: 2002
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11. Flow Cytometric Analysis of 5-Cyano-2,3-Ditolyl Tetrazolium Chloride Activity of Marine Bacterioplankton in Dilution Cultures
The respiratory activity of marine bacteria is an important indication of the ecological functioning of these organisms in marine ecosystems. The redox dye 5-cyano-2,3-ditolyl tetrazolium chloride (CTC) is reduced intracellularly in respiring cells to an insoluble, fluorescent precipitate. This product is detectable and quantifiable by flow cytometry in indi
American Society for Microbiology.