Converters Control
Mostrando 13-24 de 52 artigos, teses e dissertações.
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13. Análise, projeto e implementação de conversores CC-CC com ampla faixa de conversão aplicados em iluminação de estado sólido
This work consists of the study, design and implementation of DC-DC converters, used in lighting systems based on light emitting diodes (LEDs). Can be powered by an universal AC voltage source or battery, and the current in the LEDs is controlled digitally. The main objective is to present a proposal of new step-up/down converters topologies with full conver
Publicado em: 2009
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14. AnÃlise de tÃcnicas de controle de conversores conectados a redes elÃtricas
This work presents a performance analysis of some control techniques applied to voltage-source converters during transients in the power systems. In this sense, in all the computational simulations the converter was considered to be connected to the CHESF (Brazilian federal power utility) east system, which was represented in ATP. The transmission lines conn
Publicado em: 2009
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15. DESIGN OF CONTROLLERS FOR DC-DC CONVERTERS FOR APPROACH OF THE DISMANTLING OF / PROJETO DE CONTROLADORES PARA CONVERSORES CC-CC PELA ABORDAGEM DO DESACOPLAMENTO DE ESTADOS
In this work, we propose to analyze the controller design of a classical dc-dc converter in a different manner. Instead of the traditional mathematics transfer function analysis, we will describe the block diagram of the plant to be controlled using Space-State Averaging, decoupling the states effects one acts each other and designing the controllers individ
Publicado em: 2009
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16. Análise de propostas de estratégias de controle para algumas topologias de multiconversores monofásicos. / Analysis of control strategies for some single-phase multiconverter topologies.
This work presents the main multilevel converter topologies described in the literature. A bibliography revision is presented, showing the advantages and limitations of each topology. The most usual multilevel modulation methods are also presented, as well as their fields of application in the industry as well as in power systems. The one phase full bridge a
Publicado em: 2009
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17. Contribuições para a análise e simulação de redes ópticas: aspectos de Engenharia de Tráfego, restauração dinâmica e conversão de comprimentos de onda / Contributions for the analysis and simulation of optical networks: aspects of traffic engineering, dynamic restoration and conversion of wavelenghts
The Wavelength Division Multiplexing (WDM) technology as well as both the introduction of all optical OXCs (Optical Cross Connect) and OADMs (Optical Add/Drop Multiplexer) may provide the optical network with the networking function, i.e, the capacity to manipulate wavelengths in order to implement their routing. This possibility implies a new type of relati
Publicado em: 2009
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18. DESIGN OF A COMMERCIAL APPROACH OF ELECTRONIC BALLASTS TO SUPPLY HIGH-PRESSURE SODIUM LAMPS IN PUBLIC LIGHTING / SISTEMATIZAÇÃO DO PROJETO DE REATORES ELETRÔNICOS PARA ALIMENTAÇÃO DE LÂMPADAS DE VAPOR DE SÓDIO EM ALTA PRESSÃO PARA ILUMINAÇÃO PÚBLICA
This thesis presents an electronic ballast prototype to supply high-pressure sodium lamps used in public lighting. The goal is to develop a commercial approach able to replace the still commonly used electromagnetic ballasts, performing improvements in the public lighting system. Along this thesis, the state of art in lighting area is presented, especially i
Publicado em: 2009
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19. Generalized scalar modulation strategy for matrix converters / EstratÃgia de modulaÃÃo escalar generalizada para conversores matriciais
Power processors are devices capable to convert a set of voltages, with fixed amplitude and frequency, in other set, with controlled amplitude and frequency. The main function of these processors is to work as an adjustable power supply. The direct power converters are a class of power processors. They have significant advantages compared with the traditiona
Publicado em: 2008
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20. MÃtodos de sincronizaÃÃo de conversores em sistemas de geraÃÃo distribuÃda / Converter synchronization methods for distributed generators systems
The use of frequency converters DC/AC to integrate renewable energy as distributed generation is becoming more common. In such applications, the synchronization with the voltage vector is fundamental to control the converters, particularly considering the new requirements on Low Voltage Ride Through demanded from the distributed generation. This work propose
Publicado em: 2008
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21. ADVANCED USE OF THE EXCEEDING POWER PLANT CAPACITY OF HVDC TRANSMISSION SYSTEMS TO PRODUCE OXYGEN AND HYDROGEN / UTILIZAÇÃO AVANÇADA DA CAPACIDADE EXCEDENTE DE SISTEMAS DE TRANSMISSÃO CCAT PARA PRODUÇÃO DE OXIGÊNIO E HIDROGÊNIO
This PhD thesis discusses the use of the power plant capacity in HVDC transmission systems during inactive periods of the main converters to feed local loads, aiming at a better AC power quality and DC transmission. The power available in the inactive periods is drained by an auxiliary converter connected in parallel with the HVDC converter. This energy can
Publicado em: 2008
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22. Controle vetorial de velocidade de um motor de indução trifásico com estimação neural de fluxo
This work describes the study and the implementation of the speed control for a three-phase induction motor of 1,1 kW and 4 poles using the neural rotor flux estimation. The vector speed control operates together with the winding currents controller of the stator phasis. The neural flux estimation applied to the vector speed controls has the objective of com
Publicado em: 2008
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23. Aplicação do controle baseado em passividade em conversores estáticos operando como préreguladores de fator de potência
This work studies a passivity based control approach applied to a switch-mode converters, specially the non isolated step-down (buck) converter operating in continuous conduction mode. Passivity is funded in energy concepts and consists in adjusting the system stored energy in order to achieve stability. Two different techniques are described: First, the dir
Publicado em: 2008
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24. Controle automatico eletronico de ganho com supressão de transientes aplicado a EDFAs em redes opticas WDM / Eletronic automatic gain control with transient suppresion applied over WDM optical networks
IIn WDM optical communication systems erbium doped fiber amplifiers (EDFA) have an essential function, enabling amplification of simultaneous channels independently of transmit rate. The majority of current WDM systems use point to point configuration operating with a fixed number of channels over the optical link. However, the new generation optical systems
Publicado em: 2008