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Itens para a visualização no momento 31-40 of 57
Projeto automático de controlador de velocidade sem sensor mecânico para motores de indução trifásicos
(Universidade Federal de Santa Maria, 2008-08-27)
This works proposes parameters estimation algorithm to auto-tune the control
laws of a speed sensorless servo. The identification process of the electrical and
mechanical parameters is based on recursive least squares ...
Projeto e desenvolvimento de uma fonte de potência CA trifásica a quatro fios
(Universidade Federal de Santa Maria, 2006-04-06)
This work presents a contribution to the study of AC Power Sources, where a prototype s development is
presented. The stages that compose the system, including converter topology, filter, instrumentation and
controller, ...
Identificação automática dos parâmetros elétricos de motores de indução trifásicos
(Universidade Federal de Santa Maria, 2008-08-26)
This work presents an algorithm able to identify all electrical parameters of three
phase induction motor, with discrete realization, using a fixe-point digital signal
processor based platform. Some techniques presents ...
Otimização de operação dos meios básicos de controle de tensão em sistemas de distribuição
(Universidade Federal de Santa Maria, 2005-06-17)
This dissertation presents methods and algorithms to increase use efficiency of basic voltage control equipment on power distribution systems and also models for secondary distribution networks. This basic voltage control ...
Turbinas eólicas: modelo, análise, e controle do gerador de indução com dupla alimentação
(Universidade Federal de Santa Maria, 2004-12-21)
This thesis presents the main concepts and configurations used in wind turbine connected to the grid, as well as, an analysis, design and implementation of the control system for the Doubly Fed Induction Generator (DFIG). ...
Metodologia de síntese de topologias ZVT simplificadas aplicadas a pólos PWM bidirecionais
(Universidade Federal de Santa Maria, 2009-11-27)
Among the soft-switching techniques, the zero-voltage-transition (ZVT) technique has been accepted well by the industry due its attractive characteristics, such as simplicity, low losses in the auxiliary commutation circuit ...
Análise da influência da freqüência de comutação e da ondulação da corrente de entrada no projeto de conversores PFC para minimização do volume de magnéticos
(Universidade Federal de Santa Maria, 2006-03-31)
This work investigates the relationship among the magnetic volume, switching
frequency and input current ripple of a single-phase, 1kW boost based PFC converter
with universal input voltage range, complying with the ...
Sistema de iluminação distribuída utilizando LED's acionados por dois conversores flyback integrados
(Universidade Federal de Santa Maria, 2007-07-20)
This dissertation describes the design and implementation of an emergency lighting system using Light Emitting Diodes (LED s). The system is composed by two integrated converters working as battery charger and LED s ...
Métodos e algoritmos para ajuste dos meios básicos para controle de tensão em sistemas de distribuição
(Universidade Federal de Santa Maria, 2007-11-09)
Nowadays, the quality of energy supplied to customers is an important aspect that must be taken into account in distribution systems analysis. The Brazilian national agency which regulates the distribution systems standards ...
Interação entre conversores chaveados com baixa ondulação e células de combustível
(Universidade Federal de Santa Maria, 2007-01-17)
This dissertation discusses the interaction between fuel cells and the DC-DC converter just connected across its terminals. For that, it presents a modified algorithm to represent the dynamic behavior of fuel cell stacks ...