Buscar
Itens para a visualização no momento 1-10 of 497
Análise, projeto e desenvolvimento de sistemas multiníveis híbridos
(Universidade Federal de Santa Maria, 2005-03-21)
This Ph.D. Dissertation presents contributions to the study of hybrid multilevel systems, analyzing several issues that compose this system, such as: topological variations
of the output inverter stage and input rectifier ...
Desenvolvimento de métodos e algoritmos para avaliação e otimização da confiabilidade em redes de distribuição
(Universidade Federal de Santa Maria, 2005-06-17)
The distribution system is an extremely important part of the energy supply. At the same
time, distribution networks, most of them with radial configuration, are much more vulnerable
elements compared with transmission and ...
Motor ultra-sônico linear com geometria tubular
(Universidade Federal de Santa Maria, 2008-05-07)
This work presents the study on a linear ultrasonic motor with tubular geometry for linear displacements. Similar topologies, reported elsewhere, are conceived for producing rotary motions. Due to some particular characteristics ...
Avaliação da segurança da operação de sistemas elétricos de potência considerando os limites de estabilidade angular e de tensão
(Universidade Federal de Santa Maria, 2008-02-22)
This work presents new analytical and computational methods for operation security assessment of electric power systems by considering Angle and Voltage Stability Limits. In the context of Angle Stability, it was developed ...
Inversores ZCZVT com acoplamento magnético: síntese e análise
(Universidade Federal de Santa Maria, 2008-03-10)
This Ph. D. Thesis presents a in deep study of the mechanism of resonant transition soft-switching techniques. By means of the principles that rules the PWM resonant transition converters, a novel tool for analysis and ...
Algoritmo de localização de nodos para redes de sensores móveis
(Universidade Federal de Santa Maria, 2009-12-21)
This thesis presents contributions to node localization in mobile sensor networks. Considering the importance of localization algorithms in identifying the location of an
event in order to better determine the action to ...
Utilização de conversores eletrônicos que alimentam leds de alto brilho na aplicação em tecido humano e sua interação terapêutica
(Universidade Federal de Santa Maria, 2009-08-31)
This paper presents a study on the application of high-brightness LED (Light Emitting Diode)to health care. The LEDs are supplied by electronic converters, proposed in order to analyze the light emitted by the LEDs and ...
Processamento de sinais analógicos amostrados utilizando técnicas de chaveamento a capacitor e a corrente aplicados à conversão AD sigma delta
(Universidade Federal de Santa Maria, 2009-08-27)
Circuits for sampling and retention of analogue signals are commonly implemented with techniques such as switched capacitors (SC). SC circuits employing the storage of charge in a linear capacitor to represent a signal in ...
Utilização avançada da capacidade excedente de sistemas de transmissão CCAT para produção de oxigênio e hidrogênio
(Universidade Federal de Santa Maria, 2008-04-02)
This PhD thesis discusses the use of the power plant capacity in HVDC transmission systems during inactive periods of the main converters to feed local loads, aiming at a better AC power quality and DC transmission. The ...
Técnicas de integração de circuitos de auxílio à comutação aplicadas a inversores e a sistemas multi-pólos
(Universidade Federal de Santa Maria, 2007-09-19)
This Ph. D. dissertation presents contributions to the investigation of soft-switching cells with integrated components, presenting three main approaches: (i) Soft-switching cells with filter coupled inductor; (ii) Integrated ...