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Itens para a visualização no momento 21-30 of 181
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 ...
Controle adaptativo robusto de estrutura variável por modelo de referência aplicado a filtros ativos de potência
(Universidade Federal de Santa Maria, 2010-08-27)
This works presents a Robust Variable Structure Model Reference Adaptive Control scheme denoted VS RMRAC. In this adaptive control strategy, each parameter of the control law is obtained by the sum of two other adaptive ...
Contribuição ao estudo do gerador de indução duplamente alimentado: operação durante distúrbios na rede elétrica
(Universidade Federal de Santa Maria, 2010-08-30)
The Doubly Fed Induction Generator (DFIG) is one of the most frequently deployed large grid connected Wind Turbines (WT) concept. The implementation of classical
vector control techniques, have been proven to work well for ...
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 ...
Controladores discretos de tensão baseados no princípio do modelo interno aplicados a inversores trifásicos PWM
(Universidade Federal de Santa Maria, 2005-12-09)
This thesis contributes to the analysis, project and implementation of discrete-time controllers based on the Internal Model Principle, aiming to improve the performance of three-leg three-phase PWM inverters with insulating ...
Análise e desenvolvimento de sistema eletrônico de iluminação com LEDs de potência empregando conversor ressonante e indutor variável
(Universidade Federal de Santa Maria, 2017-08-25)
An analysis and design of a power control stage topology for an LED (Light Emitting Diode) driver for lighting is presented in this work. The circuit is based on the resonant topology LLC-HB – resonant filter LLC type fed ...
Estimação fasorial para relés de proteção numéricos usando redes neurais artificiais e o algoritmo de Levenberg-Marquardt
(Universidade Federal de Santa Maria, 2018-03-16)
In this work, two methodologies for phasor estimation in numerical protective relays in
Electrical Power Systems will be presented: one based on Artificial Neural Networks, and another
based on the Levenberg-Marquardt ...