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Itens para a visualização no momento 11-20 of 23
Controladores discretos de tensão baseados no princípio do modelo interno aplicados a inversores trifásicos PWM
(Universidade Federal de Santa Maria, 2005-12-09)
This thesis contributes to the analysis, project and implementation of discrete-time controllers based on the Internal Model Principle, aiming to improve the performance of three-leg three-phase PWM inverters with insulating ...
Técnicas de projeto para o reator eletrônico auto-oscilante empregando ferramentas de controle
(Universidade Federal de Santa Maria, 2004-08-30)
This work presents a design methodology and analyss of the selfoscillating electronic ballast used in fluorescent lamps. The self-oscillating electronic ballast is represented as a control system with a nonlinear behavior. ...
Metodologia para localização e dimensionamento de pequenas fontes de geração distribuída em redes de distribuição a partir de uma análise multicriterial
(Universidade Federal de Santa Maria, 2004-04-29)
In the last years the distributed generation (DG) has been the objective of
researches in many countries. This generation type presents advantages in relation
to centralized generation, such as the reduction of technical ...
Método de sincronização aplicado a conversores PWM trifásicos
(Universidade Federal de Santa Maria, 2006-07-17)
In the last decade, disturbances in the electrical system have been increased, mainly due to proliferation of nonlinear loads. As a result harmonic distortion, voltage unbalance and frequency variations are becoming a ...
Desenvolvimento e implementação de uma micro-rede avançada de alta freqüência para integração de fontes alternativas de energia
(Universidade Federal de Santa Maria, 2006-03-17)
This Thesis presents a distributed generation system, which works as a Microgrid, suitable to integrate alternative energy sources, using a high frequency AC link (HFAC) as a means of connecting sources and loads. The ...
Novos métodos para reconfiguração das redes de distribuição a partir de algoritmos de tomadas de decisão multicriteriais
(Universidade Federal de Santa Maria, 2007-12-14)
The electric networks reconfiguration has as purpose: to reduce the energy losses, to improve the voltage profile for the customers, to increase the reliability levels or to re-establish the energy supply in contingency ...
Uma contribuição ao controle de motores de indução trifásicos sem o uso de sensores mecânicos
(Universidade Federal de Santa Maria, 2007-06-01)
This work presents contributions to encoderless speed servo study using three phase induction motor. Initially, a general overview on the literature is presented about control
techniques applied to encoderless speed servo ...
Metodologia de projeto de fontes ininterruptas de energia monofásicas empregando controladores de ação repetitiva auxiliar no estágio de saída
(Universidade Federal de Santa Maria, 2006-12-18)
The present doctoral thesis concentrate efforts in the consolidation of the benefits introduced by the plug-in repetitive action in the performance of pulse-width modulated
voltage source inverters. The work is focused ...
Integração de conversores estáticos aplicados a sistemas de iluminação pública
(Universidade Federal de Santa Maria, 2007-12-20)
This work presents a family of integrated electronic ballasts applied to the public lighting system. The electronic ballasts are designed to supply High-Pressure Sodium lamps according to the desired lamp operation ...
Princípio de integração de circuitos de auxílio à comutação: o estudo do caso ZVT
(Universidade Federal de Santa Maria, 2007-12-10)
The main contribution of this Thesis is the proposition of the integration concept of auxiliary commutation circuits applied to systems with several power conversion stages. Trough this concept, the reactive energy resulting ...