Load Voltage Control
Mostrando 13-24 de 51 artigos, teses e dissertações.
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13. 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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14. CONTRIBUTION TO THE CONNECTION OF DOUBLY-FED INDUCTION GENERATORS WITH A SERIES GRID SIDE CONVERTER / ANÁLISE DA CONEXÃO DE GERADORES EÓLICOS DUPLAMENTE ALIMENTADOS COM COMPENSAÇÃO SÉRIE
This dissertation addresses the main problems related to doubly-fed induction generators (DFIG) connection to grids with unbalanced voltages. Series compensation is used to achieve balanced voltage on the stator of the machine, avoiding torque oscillations and high currents due to the grid voltage unbalance. The DC-link voltage control proposed reduces the c
Publicado em: 2008
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15. Implementação de sistemas inteligentes em processadores digitais para controle de máquinas elétricas rotativas / Implementation of intelligent system in digital processor for rotative electric machine control
The objective of this work consists of the implementation of intelligent system architecture in Digital Signal Processor (DSP) aiming at the real-time three-phase induction motor control. Therefore, a fuzzy logic speed control drive system for three-phase induction motor is proposed, whereas the control methodology is based on voltage and frequency (Volts/He
Publicado em: 2008
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16. Feeders parallelism through vis-a-vis disconnecting switches in aerial primary distribution network. / Paralelismo de alimentadores através de seccionadoras de vis-à-vis na rede aérea primária de distribuição.
An important aspect related to the distribution systems operation concerns the safety required in the post-disturbances restorement actions or in the emergency and scheduled maneuvers, which involve the need for load transfer between primary overhead feeders of a same sub-station or for an adjacent sub-station, in a safe and reliable way, complying with the
Publicado em: 2008
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17. Development of an electronic device for attraction drops of the electrostatic spraying in citric plants / Desenvolvimento de sistema eletrônico para pulverização e atração de gotas em plantas cítricas
The technology of application of agricultural defensives in tree like plants and orchard plants in general way, still little is researched in Brazil. Ahead of requirements of the international market, the application technology must take care of some parameters that will give the credibility of the Brazilian products in the exterior market, as for the certif
Publicado em: 2008
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18. Food mechanics: a new device for testing fruits and vegetables
The new mechanical device developed is capable of performing compression tests but also bending, torsion and tensile tests. Its measurement system has the following components: a load cell (0 to 9800 N), a strain gauge signal conditioning board, a plug-in general purpose data acquisition board, and a displacement sensor (0 to 29.7 mm). These components are c
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
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19. Computation of voltage stability margins of power systems / Obtenção da margem minima de estabilidade de tensão de sistemas eletricos de potencia
This work presents a new and fast method for computing the minimum voltage stability margin of electric power systems. The computation of the voltage stability margin (VSM) is often required for the planning and operation of power systems. Usually, loads are increased along a predefined direction, which can be estimated based on historical data or load forec
Publicado em: 2007
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20. VOLTAGE CONTROL SENSITIVITY CALCULATION FOR VOLTAGE STABILITY OPERATIONAL REINFORCEMENT / ADEQUAÇÃO DAS AÇÕES DE CONTROLE DE TENSÃO EM SISTEMAS ELÉTRICOS OBJETIVANDO O REFORÇO DAS CONDIÇÕES DE SEGURANÇA DE TENSÃO
The voltage stability problem has been associated with environment questions and lack of financial resources for transmission system expansion. This reality together with the load growth makes the electrical system to be subject of heavy loadings, what can lead to situations of voltage collapse. The development of methods for evaluation of transmission netwo
Publicado em: 2007
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21. Regulador de tensÃo com comutaÃÃo eletrÃnica de taps â anÃlise de operaÃÃo e proteÃÃo das chaves estÃticas
The interconnected operation of large electrical systems and the fast spreading of the electrical sector with an increasing presence of sensitive loads to supply voltage disturbances demanded that the current laws to adapt to consumer needs, for example, to ensure the maintenance of constant voltage levels throughout the feeders of the electrical power distr
Publicado em: 2007
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22. Intelligent system to control voltage regulator relays / Sistema inteligente para controle de relés reguladores de tensão
This work presents an approach to voltage control in power distribution systems with load tap changers. Intelligent approaches are studied and applied in voltage regulator relay in order to improve the voltage profiles of the system. The proposal of this work is the addition of fuzzy modules in the conventional voltage regulator relays, which allows the expl
Publicado em: 2007
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23. Otimização da potencia de operação em sistema isolado fotovoltaico usado técnicas de inteligencia artificial / Power operation optmization of photovoltaic stand alone system using artificial intelligence techniques
This work presents a power operation optimization of photovoltaic stand alone system using artificial intelligence techniques, via a optimum voltage estimator and control systems to maintain the photovoltaic generator in the maximum power point. A Fuzzy Systems is implemented to estimate from instantaneus radiation and room temperature, the optimum voltage o
Publicado em: 2007
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24. Contributions to the intelligent electronic control of voltage regulators for systems of energy distribution in 13,8 kV / Contribuições ao controle eletrônico inteligente de reguladores de tensão para sistemas de distribuição de energia em 13,8 kV
The development considered in this work exceeds to the conventional operation until then practised by being based on a microcontrolled electronic circuit that acts on the load of the system for intermediary of 09 taps of regulation (02 of reduction, 06 of rise and the central office) in total independent way and with great speed of reply, rank that the regul
Publicado em: 2007