Electrical Generator
Mostrando 37-48 de 69 artigos, teses e dissertações.
-
37. 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
-
38. Uma contribuição à modelagem de complexos eólicos contendo geradores especiais para atenuação das componentes harmônicas
Most of the wind energy conversion systems (WECS) currently in operation in the world use asynchronous generators in the transformation of wind energy into electricity energy. In Brazil, although it is recognized that the parcel of wind farms is still very reduced, it is evidenced that the principle of the employed generation is mainly synchronous. Within th
Publicado em: 2007
-
39. Frequency estimation in power system through adaptive filtering / Estimação da freqüência em sistemas elétricos de potência através de filtragem adaptativa
This work presents a method for frequency estimation in power systems using adaptive filters based in the algorithm of least mean square (LMS). The analysis of the power system is made through the conversion of the three-phase voltages in a complex signal with the application of alfabetatransform, whose complex form was directed to the algorithm of adaptive
Publicado em: 2007
-
40. 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
-
41. Uma contribuiÃÃo à modelagem de complexos eÃlicos contendo geradores especiais para atenuaÃÃo das componentes harmÃnicas
Grande parte dos sistemas de conversÃo de energia eÃlica (WECS) atualmente em operaÃÃo no mundo utiliza geradores assÃncronos para a transformaÃÃo da energia contida no vento em energia elÃtrica. No Brasil, embora se reconheÃa que a parcela de centrais eÃlicas ainda seja bastante reduzida, destaca-se que o princÃpio da geraÃÃo empregada à major
Publicado em: 2007
-
42. 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
-
43. SISTEMA PARA APROVEITAMENTO DE ENERGIA VIBRACIONAL BASEADOS EM TRANSDUTORES ACÚSTICOS PIEZELÉTRICOS DE BAIXO CUSTO / MICROGENERATION BASED ON A LOW-COST PIEZOELECTRIC ACOUSTIC TRANSDUCER
This dissertation presents the development of a system for converting the mechanical energy from vibrations into electrical energy. The conversion is performed in a low-cost piezoelectric transducer, commonly known as buzzer. The main purpose of this system is to charge, or to extend the time between charges, of chargeable batteries up to 2V. In order to con
Publicado em: 2006
-
44. Sistema elétrico automatizado objetivando otimização na alimentação de centros de consumo. / Automated electrical system aiming optimal supply at consumption centers.
This study is about the usage of the Petri Net as an analysis and development tool of the automation of a pilot micro plant of 130 kW. The project was carried out in the energy quality laboratory center at the Escola Politécnica de São Paulo. Its main goal was to study the most important variables related to the quality of energy and the functionalities of
Publicado em: 2006
-
45. Desenvolvimento de um espectometro de emissão para a região do infravermelho proximo / Development of an emission spectrometer for the near infrared region
Despite the wide analytical application of near infrared (NIR) spectroscopy, there are few works in litetature about near infrared emission spectroscopy (NIRES) or its exploitation for analytical purposes. This work describes a development of a new NIRES instrument based on an acousto-optical tunable filter (AOTF) as wavelength selector. The instrument is al
Publicado em: 2006
-
46. Optimal dispatch of generating units in hydroelectric systems by heuristic based on langrangean relaxation and dynamic programming / Despacho otimo de unidades geradoras em sistemas hidreletricos via heuristica baseada em relaxação lagrangeana e programação dinamica
The daily scheduling operation of the electrical energy system has by target to find the dispatch generation to the next day which must be compatible with the daily generation target defined by the energy planning models and to be an operational guide. Because of its proximity with the real time operation the modeling must represent the main characteristic o
Publicado em: 2006
-
47. Analysis of systems for cooling milk on dairy farms using the biogas generated in CDM projects. / Análise de sistemas para o resfriamento de leite em fazendas leiteiras com o uso do biogás gerado em projetos MDL.
The Brazilian dairy sector is characterized by a great number of producers, presenting low productivity and product quality. Concerning to quality, it is necessary the implantation of cooling systems for milk and conservation on farm. However, a low milk production level and the electric power availability on rural areas sometimes make unfeasible investments
Publicado em: 2006
-
48. 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