Buscar
Itens para a visualização no momento 131-140 of 183
Gerenciamento da climatização de células a combustível do tipo PEM para integração com a rede de energia elétrica visando à eficiência energética
(Universidade Federal de Santa Maria, 2010-03-29)
Fuel cells (FCs) offer a friendly environmental way to generate energy. Specifically, these
devices require only a fuel (generally, hydrogen) and an oxidizer (pure oxygen or air) to
produce electricity, water and heat. ...
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 ...
Desenvolvimento de conversores de cinco níveis com capacitor chaveado e grampeamento ativo do ponto neutro
(Universidade Federal de Santa Maria, 2022-06-28)
This work aims to propose a five-level converter topology. The proposed converter
uses the switched capacitor concept with an active neutral point clamped structure, with
one floating capacitor per phase and only one ...
Conversores compostos para o interlink entre os barramentos de baixa e extrabaixa tensão de nanorredes CC
(Universidade Federal de Santa Maria, 2022-07-27)
This thesis presents a study on isolated DC-DC converters for the interface between a
low voltage bus, EBT (48 V), and a low voltage bus, BT (380 V) for a 1.2 kW residential
DC-DC nanogrid. The proposed converter makes ...
Contribuições ao controle adaptativo robusto por modelo de referência
(Universidade Federal de Santa Maria, 2022-09-30)
This work proposes to combine RMRAC (Robust Model Reference Adaptive Control)
control techniques to improve controller performance and ensure system robustness.
Furthermore proposed the development of stability proofs ...
Análise, projeto e implementação de um arranjo flexível de conversores estáticos para sistemas de conversão de energia eólica conectados à rede
(Universidade Federal de Santa Maria, 2013-07-29)
This Thesis deals with the analysis, design and implementation of a flexible arrangement
of static converters for grid connected Wind Energy Conversion Systems (WECS). The
main features of the proposed flexible arrangement ...
Análise e controle de aerogeradores com conversor pleno durante afundamentos de tensão
(Universidade Federal de Santa Maria, 2012-09-28)
This thesis addresses the main issues regarding the operation of full power converters
wind turbines connected to the grid under balanced and unbalanced voltage sags.
In the past, the grid codes allowed wind turbines to ...