Current Harmonics
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Construction and measurement of an electromagnetic noise generator based on an automotive coil
This article covers the design of an electromagnetic noise generator which uses an automotive coil as the main component. A short theoretical analysis covers the generation of high voltage pulsed current from the available DC source originated from the battery. An electronic dimmer, a circuit used to control the brightness of a light, by controlling the effe
Rev. Bras. Ensino Fís.. Publicado em: 22/06/2017
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2. Interferência de harmônicas em equipamentos de medição de energia elétrica. / Harmonic interference in equipment for measurement of eletrical energy.
This work addresses the reliability of energy meters in nonsinusoidal systems, looking for the increase of quality in the electric energy billing. To that purpose, it focuses on a fairer metering and a better relationship between the concessionaire and consumer. The tests were carried through in the laboratories of Eletropaulo, of the Electro-Technology and
Publicado em: 2009
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3. Substitution of Electrotherm by Combustible Gases in the Industrial Sector / Substituição da eletrotermia por gases combustíveis no setor industrial
This work analyzes the technical, economical and financial viability to substitute the resistive electrotherm for the direct combustion of fuel gases, such as natural gas (NG) and liquefied gas of petroleum (LGP). In order to do so, a study of the electrotherm presence in the productive process of some industries located in The Great São Paulo has been done
Publicado em: 2008
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4. Low-cost PWM speed controller for an electric mini-baja type vehicle
This paperwork presents a Pulse Width Modulation (PWM) speed controller for an electric mini-baja-type car. A battery-fed 1-kW three-phase induction motor provides the electric vehicle traction. The open-loop speed control is implemented with an equal voltage/frequency ratio, in order to maintain a constant amount of torque on all velocities. The PWM is impl
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
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5. Determinação do conteúdo harmônico de corrente baseada em redes neurais artificiais para cargas não-lineares monofásicas / Determination of the current harmonic content based on artificial neural networks for single-phase non-linear loads
In this thesis artificial neural networks are employed in a novel approach to identifying harmonic components of the single-phase nonlinear load current, whose amplitudes and phase angles are subject to unpredictable changes in steady-state. An identified harmonics number is previously selected. These harmonics are present in the non-linear loads current of
Publicado em: 2007
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6. CONTRIBUTIONS TO STUDY OF WIND FARM CONNECTION TO THE UTILITY / CONTRIBUIÇÕES AO ESTUDO DE CONEXÃO DE GERAÇÃO EÓLICA À REDE ELÉTRICA
Distribution systems have not been designed to receive distributed generation (DG) units. The electric energy injection in these systems is safe and reliable if the characteristics regarding of DG interconnection in distribution power systems are considered: (i) Protection; (ii) Stability; (iii) Electric energy market; (iv) Quality of energy. In this work, a
Publicado em: 2007
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7. Caracterização de harmônicos causados por equipamentos eletro-eletrônicos residenciais e comerciais no sistema de distribuição de energia elétrica
The non linearity on the profile of residential and commercial electrical loads has been growing, mainly in these days of seeking for bigger energy efficiency of household appliances as well as the access of the population to electronic consumer goods. The preocupation for a better power quality has been growing by the customer and also by the energy distrib
Publicado em: 2006
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8. Power electronica control in direct water heater of optimized half cycles. / Controle eletrônico de potência em aquecedores elétricos de passagem por semi ciclos otimizados.
Modern electrical direct water heating (DWH) equipments use electrical resistances built with metal alloys (iron-chrome-aluminum or nickel-chrome) as heating elements. Water temperature control is usually made with water flow control, as well as with resistance tap changing. The simplicity of this approach conflicts with to the lack of flexibility to allow s
Publicado em: 2006
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9. DESENVOLVIMENTO E IMPLEMENTAÇÃO DE UMA MICRO-REDE AVANÇADA DE ALTA FREQÜÊNCIA PARA INTEGRAÇÃO DE FONTES ALTERNATIVAS DE ENERGIA / DEVELOPMENT AND IMPLEMENTATION OF AN ADVANCED HIGH FREQUENCY MICROGRID FOR INTEGRATION OF ALTERNATIVE ENERGY SOURCES
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 static compensation of current harmonics, reactive power and voltage harmonics, which can be found in the Microgrid, is considered a key facto
Publicado em: 2006
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10. Active Power Filters for current harmonics and reactive power compensation / Filtros Ativos de PotÃncia para CompensaÃÃo de HarmÃnicos de Corrente e PotÃncia Reativa
A popularizaÃÃo dos componentes eletrÃnicos e o conseqÃente aparecimento de novas tecnologias impulsionaram o surgimento de problemas na qualidade da energia da rede elÃtrica. O principal objetivo dessa dissertaÃÃo à estudar as propostas de compensaÃÃo das distorÃÃes nas correntes da rede elÃtrica geradas pela presenÃa de cargas que contÃm um
Publicado em: 2006
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11. An estimate of the magnetic lossesin reactors with natural saturation / Uma estimativa das perdas magnÃticas em reatores com saturaÃÃo natural
This work has the purpose of showing an estimate of the modeling of power dissipated in ferromagnetic structures with profoundly saturated parts, through the behavior of the magnetic induction wave form experimented in many parts of the structure when used in saturated reactors. For each one of the analyzed prototypes, the bonding forms of the primary windin
Publicado em: 2006
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12. Análise das Correntes do PMSM Acionado pelo Controle do Inversor de Modo Dual na Região de Potência Constante para Avaliação do Torque Pulsante
Este trabalho trata da análise do torque pulsante na Máquina Síncrona de Ímã Permanente - PMSM acionada pelo Controle do Inversor de Modo Dual - DMIC em uma ampla faixa de velocidade na região de potência constante. O princípio de operação do DMIC acionando o PMSM na região de potência constante é descrito. São apresentados os resultados analí
Publicado em: 2006