Buscar
Itens para a visualização no momento 1-10 of 62
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 ...
Avaliação da qualidade de energia e performance de potência de turbinas eólicas conectadas à rede elétrica
(Universidade Federal de Santa Maria, 2010-02-22)
This master thesis describes a system capable of real-time characterization of power performance and power quality of wind turbines, based mainly on the IEC 61400-21 and IEC 61400-12-1 standards. To verify the performance ...
Aspectos técnicos e operacionais do uso de microturbinas conectadas aos sistmas elétricos para geração distribuída de energia
(Universidade Federal de Santa Maria, 2010-06-16)
The considerable increase in energy demand has increased the interest in reducing costs, improving reliability, quality and stability of power generation systems. The connection of distributed generation (DG) can be used ...
Desenvolvimento de metodologia do projeto do reator eletrônico auto-oscilante com entrada universal
(Universidade Federal de Santa Maria, 2010-01-14)
This work presents the design and analysis of an electronic system with universal input to supply a fluorescent lamp. The system includes a self-oscillating electronic ballast and an additional circuit which allows keeping ...
Desenvolvimento de uma fonte de potência CA para geração de formas de onda de até 2kHz
(Universidade Federal de Santa Maria, 2010-07-30)
This work presents the development of an alternating current power source with a single-phase full bridge voltage inverter, based on electronic switches. The source is designed to drive electromechanical and electric plants. ...
Balanço hídrico de microbacia com eucalipto e pastagem nativa na região da Campanha do RS.
(Universidade Federal de Santa Maria, 2010-02-11)
To obtain guidance in forestry hidrology it s inevitable to approach the understanding of the relations between the forest (natural or planted) and the water, concerning its use and consumption. However, the studies that ...
Biodigestores e biogás: balanço energético, possibilidades de utilização e mitigação do efeito estufa
(Universidade Federal de Santa Maria, 2010-04-30)
Biogas is a gaseous composition formed mainly by the methane gas (CH4) and by the carbon dioxide (CO2), generated especially by microbiologic processes in
environment with few or no oxygen. This research was carried out ...
Fatores de competitividade de empresas organizadas em redes de cooperação
(Universidade Federal de Santa Maria, 2010-04-14)
The transformation of the world economy that brought the collapse of borders and trade barriers brought a setting conducive to the prosperity of large corporations,
while small and medium enterprises have gained additional ...
Utilização da metodologia ahp para alocação de equipamentos telecomandados em sistemas de distribuição para melhoria da confiabilidade
(Universidade Federal de Santa Maria, 2010-09-22)
In power utilities the subject reliability is a permanent worry. In this new context, some solutions have been developed and researched to an alternative to improve the performance on service restoration when there are ...