Buscar
Itens para a visualização no momento 1-10 of 20
Uma proposta de interconexão de proteções para detecção de ilhamento em sistemas de geração distribuída
(Universidade Federal de Santa Maria, 2014-02-27)
This work presents a methodology for detecting islanding in distributed generation
systems - DG - which use internal combustion engines as primary sources and synchronous
generators connected directly to grid. The proposed ...
Aumento da eficiência de painéis fotovoltaicos com esfriamento por energia geotérmica e aquecimento de água
(Universidade Federal de Santa Maria, 2014-02-24)
This thesis deals with the increased efficiency of photovoltaic panels (PVs) through
cooling the cells by geothermal energy and water heating. Initially, a photovoltaic modeling is
made proposing an equation to obtain the ...
Comutador eletrônico de taps aplicado a um transformador de distribuição monofásico
(Universidade Federal de Santa Maria, 2014-02-27)
Voltage regulation still is a problem faced by power utilities currently. In addition to the series
impedance and the significant load variation of the distribution grids, the main causes of voltage
regulation problems, ...
Instrumentação para levantamento de dados do perfil geotérmico superficial visando a troca sustentável de calor
(Universidade Federal de Santa Maria, 2014-10-10)
Nowadays, the rational energy consumption is one of the main concerns of the whole
modern society. Thus, this dissertation contributes to improve energy efficiency, increase the
renewable energy sources and to develop ...
Concepção de um circuito energy harvesting aplicado a redes de sensores sem fio para sistemas de iluminação
(Universidade Federal de Santa Maria, 2014-08-29)
This thesis aims to present the design and development of an Energy Harvesting (EH) circuit applied to wireless sensor networks (WSN), especially those that perform functions in lighting systems, such as monitoring or ...
Reconfiguração de redes de distribuição em situações de contingências considerando operação ilhada de PCH
(Universidade Federal de Santa Maria, 2014-08-22)
One of the main concerns of the power utilities is secure, continuously supplying electric power to customers, thus meeting so satisfy these as to regulatory requirements. Thus, the proposed paper presents a method of ...
Sistema RGB com controle de fluxo luminoso e redução de variação cromática
(Universidade Federal de Santa Maria, 2014-07-10)
This work proposes a control methodology of luminous flux through independent sink temperature and current applied to red, green and blue LEDs. The main characteristics of solid-state lighting and LEDs themselves are ...
Estudo das características de materiais magnéticos aplicados ao acionamento de lâmpadas fluorescentes sem eletrodos
(Universidade Federal de Santa Maria, 2014-04-02)
This paper presents a study of the characteristics of magnetic materials. The application of this study is the feeding of an electrodeless fluorescent lamp (EFL). This type of lamp is driven by electromagnetic effects and, ...
Controle de corrente aplicado a conversores PWM conectados à rede elétrica sem sensor de tensão CA utilizando observadores de corrente por modos deslizantes
(Universidade Federal de Santa Maria, 2014-08-22)
This master thesis presents a current sliding mode observer for voltage sensorless
grid connected converters. To perform the grid synchronization a sliding mode current
observer in stationary axes αβ is proposed. Aiming ...
Metodologia para análise da coordenação e seletividade de dispositivos de proteção durante reconfigurações de redes de distribuição
(Universidade Federal de Santa Maria, 2014-03-28)
With the emergence of the concept of Smart Grid (SG), the Power Distribution Systems are undergoing major changes in the way it is operated, studied and analyzed. The breakthrough technology of measurement, automation, ...