Encontrados 41 documentos, a visualizar página 1 de 5
Condicionadores ativos de potência para mitigação de problemas de qualidade de ...
Pinto, J. G.; Gonçalves, Henrique; Afonso, João L.Os condicionadores ativos são equipamentos baseados em eletrónica de potência que permitem mitigar de forma dinâmica diversos problemas nas tensões e nas correntes do sistema elétrico, contribuindo efetivamente para a melhoria da produtividade das indústrias, reduzindo os prejuízos provocados pelos problemas de Qualidade de Energia Elétrica.
Monitorização da qualidade da energia elétrica
Moreira, Rui P.; Gonçalves, Henrique; Pinto, J. G.; Afonso, João L.A monitorização da Qualidade da Energia Elétrica é uma mais-valia para os responsáveis pelas instalações elétricas, permitindo a otimização dos perfis de consumo e a identificação e prevenção de problemas.
Conversion of an internal combustion engine vehicle into an electric vehicle
Pedrosa, Delfim; Monteiro, Vítor; Gonçalves, Henrique; Exposto, Bruno; Pinto, J. G.; Afonso, João L.In this paper is described the conversion of an Internal Combustion Engine (ICE) vehicle into and Electric Vehicle (EV). The main steps of this conversion are briefly described, especially the standards to legalize EVs in Portugal, and the EV elements, mainly, the electric motor and its respective controller, and the batteries with the charging system. This paper also presents the modifications performed in t...
Development of a digital controller with data acquisition to a test bench for e...
Pedrosa, Delfim; Pereira, Rui; Gonçalves, Henrique; Exposto, Bruno; Monteiro, Vítor; Pinto, J. G.; Afonso, João L.The electric motors’ test benches are greatly used by electric motors manufacturers and drive system designers. In this paper it is described the conversion process of an older manually controlled test bench, in an automatic digitally controlled one with integrated data acquisition system. The renewed test bench is based in a two quadrant eddy current electromagnetic brake, in which the manual torque controller...
Bidirectional multilevel converter for electric vehicles
Monteiro, Vítor; Pinto, J. G.; Ferreira, João C.; Gonçalves, Henrique; Afonso, João L.In this paper is presented an H-Bridge Multilevel Converter topology for Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs). The topology of the presented multilevel converter allows the interface between the batteries, the electric motor of the vehicle, and the electrical power grid. Thereby, taking into account that the proposed multilevel converter requires the use of isolated voltage sourc...
Comparison of charging systems for electric vehicles and their impact on electr...
Monteiro, Vítor; Ferreira, João C.; Pinto, J. G.; Exposto, Bruno; Pedrosa, Delfim; Afonso, João L.This paper presents a comparison of four types of on-board batteries charging systems for Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs), and their impact on the power quality of the electrical power grid. In the comparison are analyzed the features, the characteristics and the operation of each charging system, aiming their controllability and their impact on the electrical grid, mainly c...
Assessment of a battery charger for electric vehicles with reactive power control
Monteiro, Vítor; Pinto, J. G.; Exposto, Bruno; Gonçalves, Henrique; Ferreira, João C.; Couto, Carlos; Afonso, João L.Batteries of Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs) have a large potential not only to provide energy for the locomotion of these vehicles, but also to interact, in dynamic way, with the power grid. Thereby, through the energy stored in the batteries, these vehicles can be used to regulate the active and the reactive power, as local Energy Storage Systems. This way, EVs can contrib...
Current-source shunt active power filter with periodic-sampling modulation tec...
Exposto, Bruno; Pinto, J. G.; Pedrosa, Delfim; Monteiro, Vítor; Gonçalves, Henrique; Afonso, João L.In this paper are presented experimental and simulation results of a developed Current-Source Three-Phase Shunt Active Power Filter compensating the currents of a non-linear load. The Shunt Active Power Filter controller, described in detail along the paper, relies in the p-q Theory to calculate the reference compensation currents and to regulate the DC-link inductance current. The regulation of the...
Experimental results of a developed single-phase thyristor switched capacitor
Exposto, Bruno; Manuel, Nuno; Pinto, J. G.; Monteiro, Vítor; Pedrosa, Delfim; Afonso, João L.In this paper are presented simulation and experimental results of a developed single-phase Thyristor Switched Capacitor (TSC), when it is compensating the power factor at the fundamental frequency (displacement power factor) of an electrical system with distorted voltage. The developed single-phase TSC can produce reactive capacitive power with 3 different values. The Thyristor Switched ...
Experimental and simulation results of a current-source three-phase shunt activ...
Exposto, Bruno; Pinto, J. G.; Pedrosa, Delfim; Gonçalves, Henrique; Afonso, João L.In this paper are presented experimental and simulation results of a Current-Source Three-Phase Shunt Active Power Filter, during its operation to compensate the currents a low power factor load and a nonlinear load. The Shunt Active Power Filter controller, described in detail along the paper, relies in the p-q Theory to generate the reference compensation currents and to regulate the DC-l...
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