Frequency Converter
Mostrando 13-24 de 43 artigos, teses e dissertações.
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13. Reator eletrônico dimerizável para lâmpadas fluorescente utilizando conversor boost integrado com inversor meia ponte
This work deals with the study, design and implementation of fluorescent dimming ballast. The adopted ballast consists in a half bridge integrated with a boost converter to provide power factor correction. Three dimming techniques was studied, frequency variation, duty cycle variation and the combination between frequency and duty cycle variation. Simulation
Publicado em: 2010
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14. Three cell flying capacitor inverter for dielectric barrier discharge plasma applications
It is reported the design, construction and initial tests of a three cell flying capacitor inverter (TCFCI) in a half-bridge configuration. The device operates at a 200 kHz frequency which leads to a voltage output at 12.5 kHz presenting an acceptable response in an open-loop configuration. These features outdo those reported in the current multilevel conver
Brazilian Journal of Physics. Publicado em: 2009-06
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15. Inversor monofásico sincronizado para a conexão de um gerador eólico à rede elétrica : estudo, projeto e implementação
The aims of this work are the study, design and implementation of a dc/ac converter for the connection of a wind power generator to the electric grid. It makes use of a single-phase inverter, with three-level PWM modulation, connected to the grid through a low frequency transformer. Three distinct variables are controlled in the converter: the output current
Publicado em: 2009
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16. SYNTHESIS METHODOLOGY FOR SIMPLIFIED ZVT TOPOLOGIES APPLIED TO BIDIRECTIONAL PWM POLES / METODOLOGIA DE SÍNTESE DE TOPOLOGIAS ZVT SIMPLIFICADAS APLICADAS A PÓLOS PWM BIDIRECIONAIS
Among the soft-switching techniques, the zero-voltage-transition (ZVT) technique has been accepted well by the industry due its attractive characteristics, such as simplicity, low losses in the auxiliary commutation circuit (ACC), operation with soft-switching for a wide load range, and closest operation to the PWM converter counterpart. In three-phase volta
Publicado em: 2009
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17. Avaliação do impacto da redução de pressão nas perdas reais em setor de distribuição de água do municipio de Campo Grande MS / Impact of reduction of pressure losses in real sector of water supply of the municipality of Campo Grande MS
The losses in a system of water supply may represent a large percentage of the total water supplied, depending on age, the applied pressure and the deterioration of the system. This paper presents the water losses occurring in water supplies and various control mechanisms available to avoid them. The aim is to correlate the loss of a real system and the same
Publicado em: 2009
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18. ANÁLISE, MODELAGEM E VALIDAÇÃO EXPERIMENTAL DE UMA METODOLOGIA PARA O PROJETO DO INDUTOR EM CONVERSORES BOOST PFC / ANALYSIS, MODELING AND EXPERIMENTAL VALIDATION OF A DESIGN METHODOLOGY FOR THE INDUCTOR IN PFC BOOST CONVERTERS
This work presents the development of a methodology for design of inductor in singlephase PFC boost converters operating in CCM mode in agreement with international standards IEC 61000-3-2 and CISPR 22. Such converters are used in front-end modules of information technology equipment. This methodology is based on the investigation of the relationship among m
Publicado em: 2009
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19. MÃtodos de sincronizaÃÃo de conversores em sistemas de geraÃÃo distribuÃda / Converter synchronization methods for distributed generators systems
The use of frequency converters DC/AC to integrate renewable energy as distributed generation is becoming more common. In such applications, the synchronization with the voltage vector is fundamental to control the converters, particularly considering the new requirements on Low Voltage Ride Through demanded from the distributed generation. This work propose
Publicado em: 2008
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20. Generalized scalar modulation strategy for matrix converters / EstratÃgia de modulaÃÃo escalar generalizada para conversores matriciais
Power processors are devices capable to convert a set of voltages, with fixed amplitude and frequency, in other set, with controlled amplitude and frequency. The main function of these processors is to work as an adjustable power supply. The direct power converters are a class of power processors. They have significant advantages compared with the traditiona
Publicado em: 2008
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21. MODELING, DESIGN AND IMPLEMENTATION OF AN INSULATED POWER FACTOR CORRECTED SINGLE-STAGE CONVERTER / MODELAGEM, PROJETO E IMPLEMENTAÇÃO DE UM CONVERSOR ISOLADO COM UM ÚNICO ESTÁGIO E CORREÇÃO DO FATOR DE POTÊNCIA.
Esta Dissertação de Mestrado apresenta uma nova análise, modelagem e metodologia de projeto de um conversor CA-CC isolado com um único estágio e correção do fator de potência. Inicialmente, é apresentado o princípio de operação do conversor em estudo propiciando um melhor entendimento do funcionamento do mesmo. Assim, baseada na nova análise, s�
Publicado em: 2008
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22. Methods for extracting the fundamental-frequency positive-sequence voltage vector / MÃtodos de extraÃÃo do vetor tensÃo de sequÃncia positiva na freqÃÃncia fundamental
Controle orientado pela tensÃo à uma das tÃcnicas mais usadas para operaÃÃo e controle de qualquer equipamento conectado à rede elÃtrica atravÃs de um conversor eletrÃnico CC-CA, tais como, sistemas de geraÃÃo de energia distribuÃda, sistemas de energia ininterrupta e filtros ativos. Por isso, a estimaÃÃo rÃpida e precisa do Ãngulo de fase e
Publicado em: 2008
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23. UTILIZAÇÃO DE Microsternarchus bilineatus (OSTARIOPHYSI, GYMNOTIFORMES, HYPOPOMIDAE) COMO BIOMONITOR: O EFEITO DE COMBUSTÍVEIS AUTOMOTIVOS DERIVADOS DO PETRÓLEO NA DESCARGA DO ÓRGÃO ELÉTRICO
This study evaluated the effect of automotive fuel (gasoline and diesel) on the Electric Organ Discharge (EOD) frequency of Microsternarchus bilineatus (Ostariophysi, Gymnotiform), with the objective of testing the viability of this species as a biomonitor to detect pollutant derived from petroleum. Ten individuals of the species were exposed to concentratio
Publicado em: 2008
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24. Projeto de um inversor trifásico com snubber de undeland regenerativo e controle digital implementado no DSP TMS320F2812
This work deals with the design and implementation of the digital instantaneous averaged values control for output voltages of the three-phase inverter with Underlands snubber, using the Buck-Boost converter for regeneration of the snubbers energy. The qualitative and quantitative analysis of the inverter power structure, snubber and auxiliary converter, as
Publicado em: 2007