Buscar
Itens para a visualização no momento 821-830 of 17926
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 ...
Prototipação e análise de circuitos mutiplicadores array de baixo consumo
(Universidade Federal de Santa Maria, 2005-03-23)
This work presents the prototyping and analysis of new multiplier architectures under the physical level of abstraction. Circuits recently presented in the academic community are analyzed and compared against the state of ...
Projeto de reatores eletronicos para hid baseado no conversor chopper AC
(Universidade Federal de Santa Maria, 2007-08-24)
This thesis proposes a design of a power supply for high-pressure discharge lamps based on a high efficiency and high power factor electronic ballast, without exciting the
intrinsic acoustic resonance. The ballast consists ...
Gráficos de controle para dados do tipo taxas e proporções autocorrelacionados
(Universidade Federal de Santa Maria, 2016-03-28)
This work discusses one of the areas for quality improvement, defined as statistical process
control (SPC). One of the most used tools in SPC is the control chart, which is used to
monitor parameters of a process. In ...
Análise de estabilidade de retificadores com correção de fator de potência empregando modelos lineares periódicos no tempo
(Universidade Federal de Santa Maria, 2012-07-30)
Many control techniques applied to converters with power factor correction (PFC) use
cascaded control to compensate the output voltage and the input current. These techniques
usually employ linear time-invariant (LTI) ...
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 ...