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Integração de pilhas de células a combustível com outras fontes alternativas de energia
(Universidade Federal de Santa Maria, 2009-03-31)
This dissertation presents a project of a integrated system with distinct energy generating modules using a wind generator, photovoltaic generator, fuel cells stack
(FCs) and an accumulator of energy formed by a bank of ...
Contribuição ao estudo de estratégias de modulação aplicadas a conversores multiníveis com diodos de grampeamento
(Universidade Federal de Santa Maria, 2009-04-30)
This dissertation deals with modulation techniques for multilevel diode clamped converters.
The major challenge to be overcome by modulation strategies to these converters
is the balance of the dc-link voltage capacitors, ...
Métodos para otimização dos ajustes dos reguladores de tensão e zonas de tap em sistemas de distribuição
(Universidade Federal de Santa Maria, 2009-08-07)
The new regulations in the electric sector utilities have have requested greater efficiency and quality both in terms of continuity and in conformity of the energy
supplied. Electrical equipments quality, efficiency and ...
Análise comparativa de conversores monofásicos aplicados a correção de fator de potência
(Universidade Federal de Santa Maria, 2009-08-12)
This work presents a study and a comparative analysis of high power single-phase converter applied to power factor correctioii in according to the international standards IEC
61000-3-4 (harmonics limitation) and CISPR 22 ...
Uma nova metodologia de projeto para otimização do volume do converosr boost PFC
(Universidade Federal de Santa Maria, 2009-03-27)
This work investigates the influence of operation point (Δi @ fs) in the final volume of PFC boost converter. The boost inductor, EMI filter and thermal heatsink are the elements which main influences in the converter ...
Análise e implementação de um circuito de auxílio à comutação integrado aplicado a uma fonte ininterrupta de energia
(Universidade Federal de Santa Maria, 2008-04-14)
This study proposes an auxiliary commutation circuit, applied to a double-conversion uninterruptible power supply, operating with a three-level PWM full-bridge inverter. In order
to construct this circuit, we use the concept ...
Avaliação do desempenho dos métodos de proteção contra a perda de excitação em geradores síncronos: uma contribuição utilizando a teoria dos conjuntos nebulosos
(Universidade Federal de Santa Maria, 2008-07-28)
This work aims to evaluate the performance of the loss of field protection methods in synchronous generators. The methods are introduced to make available in a single text the various ways to protect the synchronous generator ...
Desenvolvimento de algoritmos para otimização da confiabilidade de redes de distribuição
(Universidade Federal de Santa Maria, 2004-12-16)
New regulations of the electricity sector have requested greater efficiency from the power utilities in the performance of their distribution systems, requiring more rigorous quality and continuity energy levels. This work ...
Bases experimentais para o projeto, automação e instalação de sistemas de geração de energia com células de combustível
(Universidade Federal de Santa Maria, 2005-09-15)
The main concern of this dissertation is the establishment of experimental bases for the project, automation, and installation of a micro-power plant for electric power generation based on PEM fuel cell stacks (BCS ...
Nova metodologia para a estimativa de capacitância e consumo de potência de portas lógicas complexas CMOS no nível lógico
(Universidade Federal de Santa Maria, 2005-10-31)
This dissertation presents a methodology of capacitance estimation and power consumption in CMOS circuits combinational constituted basically of complex logic gates at logic level. The main objective in the development of ...