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Metodologia de projeto de inversores para redução do custo de sistemas fotovoltaicos
(Universidade Federal de Santa Maria, 2014-02-25)
In photovoltaic systems, the lowest energy cost is not always achieved by an inverter with minimized cost or maximized efficiency. It is important to adopt methodologies that optimize the balance between system losses and ...
Metodologia de projeto eletrotérmico de LEDs aplicada ao desenvolvimento de sistemas de iluminação pública
(Universidade Federal de Santa Maria, 2012-07-23)
This work presents an LED electrothermal design methodology applied to a street
lighting system. The methodology aims to provide indicatives of the optimal LED operating
point for lighting systems design, considering ...
Contribuições à identificação de regimes operacionais de centrais geradoras a biogás de aterros sanitários conectadas à rede
(Universidade Federal de Santa Maria, 2013-02-22)
This paper aims to propose the development of strategies for setting the best times of the day when a distributed generation of electricity (GD), which uses the biogas as fuel chemical reactions in urban solid waste, ...
Análise, projeto e implementação de um D-STATCOM para redes de distribuição monofásica
(Universidade Federal de Santa Maria, 2012-07-31)
This work analyzes a voltage regulator applied to low-voltage single-phase distribution networks, especially long distribution rural distribution lines with problems to comply with voltage level standards. This voltage ...
Controle de velocidade sensorless de motores brushless DC submetidos a variações periódicas de carga
(Universidade Federal de Santa Maria, 2011-07-21)
This master thesis presents a sensorless speed control drive of Brushless DC motors
used in reciprocating compressors. These compressors cause periodic load torque
variations on the motor, consequently mechanical vibrations ...
Modulador SI-ΣΔ cascata 2-2 empregando arquitetura de baixa distorção aplicado à conversão AD
(Universidade Federal de Santa Maria, 2012-03-16)
The increasing complexity of digital circuits forces the use of new technologies. New technologies
have the advantage of reducing the circuit size and power consumption coupled with
operation speed increasement. Most of ...
Detecção e classificação de transitórios em redes de distribuição para identificação de faltas de alta impedância
(Universidade Federal de Santa Maria, 2013-03-08)
Protection systems used in distribution networks of electricity are not able to detect short circuits with high contact resistance due to the low currents generated, endangering the population and degrading the quality of ...
Análise das relações das tensões de entrada de inversores multiníveis híbridos conectados em cascata para minimizar a THD da tensão de saída
(Universidade Federal de Santa Maria, 2012-04-27)
This Master Thesis presents a study considering multilevel inverters formed from two and three level cascaded inverters.
The literature presents several papers on asymmetric multilevel inverters and most studies are related ...
Reator eletrônico para lâmpadas de descarga em alta pressão baseado no conversor biflyback inversor
(Universidade Federal de Santa Maria, 2011-07-26)
The study of the best utilization of high intensity discharge lamps deals with the great global concern with energy efficiency. Electronic ballasts are the current devices that can make the good use of high luminous efficacy ...
Análise comparativa da energia injetada na rede por inversores módulos CA utilizados em sistemas fotovoltaicos
(Universidade Federal de Santa Maria, 2013-05-29)
This Master's Dissertation aims to compare two topologies of AC Module converters, applied in photovoltaic systems. The principles of operation, the characteristic equations, the parameters found are detailed for both ...