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Brazilian Power Electronics Conference, COBEP

作者： Andressa C. Schittler Douglas Pappis Alexandre Campos Marco A. Dalla Costa Electrical Engineering Post-Graduation Program-PPGEE Electronic Ballast Research Group-GEDRE Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil

This paper presents an electronic ballast to supply high power (>; 400 W) high intensity discharge (HID) lamps based on interleaved converters. Due to HID lamps voltage source characteristics and their acoustic resonance issue, it is necessary to drive them with nearly constant current (reduced ripple) with a square-wave shape. Interleaved topologies become widely used as the output current levels of power converters increases. A well-known topology is the interleaved buck converter (IBC), which presents as main characteristic a low ripple output current source behavior. Therefore, an IBC can be advantageous for supplying high power HID lamps. The main goal of this paper is to introduce an IBC operating in continuous conduction mode (CCM) applied to electronic ballasts, in order to supply high power HID lamps. The IBC inductor design is the target point, since the number of cells, losses and inductor value strongly influence the overall performance in terms of size and efficiency. Inductances, magnetic core and semiconductors are analyzed and compared across the number of cells. Results are verified through simulation in PSIM software and experimentally.

关键词： High intensity discharge lamps Inductors Electronic ballasts Magnetic cores Logic gates Current control Proposals

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FC and PV emulation by buck converter based on experimental VxI curves and dynamic response

FC and PV emulation by buck converter based on experimental ...

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Brazilian Power Electronics Conference, COBEP

作者： Jordan G. Trapp Luciano P. de Lima Felix A. Farret Felipe T. Fernandes Gleisson Balen Center of Studies in Energy and Environment (CEEMA) Post-Graduation Program in Electrical Engineering (PPGEE) Technological Center Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil

This paper presents an emulation of fuel cell and photovoltaic modules based on the buck converter as a replacement of actual power sources for bench tests. This approach is suitable for power electronic designs involving power converters to interface source and DC loads or source and mains grid, without having available the real source. The output voltage of the buck converter is referred to lookup tables/equations with experimental data from actual sources under load variation to determinate the biasing curves and dynamic response. To validate the results, a comparison between simulated and practical results obtained from laboratory test with actual sources is performed. The energy source emulations with buck converters is a simple, safe, versatile, and effective way of physically representing DC sources for various laboratory tests.

关键词： Radiation effects Voltage control Mathematical model Fuel cells Transfer functions Emulation Laboratories

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Interleaved buck converter applied to high power HID lamps supplying: Design, modeling and control

Interleaved buck converter applied to high power HID lamps s...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Andressa C. Schittler Douglas Pappis Electrical Engineer Post-Graduation Program-PPGEE Electronic Ballast Research Group-GEDRE Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil

As the output current levels of power converters increases, interleaved topologies become widely used. A well-known topology is the interleaved buck converter (IBC), which presents as main characteristic a low ripple output current source behavior. Due to HID lamp voltage source characteristics and their acoustic resonance issue, it is necessary to drive them with nearly constant current with a square-wave shape. Therefore, a buck-interleaved converter can be advantageous for supplying high power HID lamps. The goal of this paper is a proposal of an electronic ballast based on a two-cell buck-interleaved converter for high power HID lamps, with current control loop, voltage sensing and constant power. A DC model based on averaged state-space technique is derived for the ballast, as well as an AC model based on small-signal disturbances. The results are verified experimentally and through simulation in Matlab/Simulink and PSIM softwares.

关键词： Switches Adaptation models Visualization

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Integration of alternative sources of energy as current sources

Integration of alternative sources of energy as current sour...

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Brazilian Power Electronics Conference, COBEP

作者： L. P. Lima F. A. Farret J. G. Trapp F. Z. Ferrigolo D. B. Ramos F. T. Fernandes Center of Studies in Energy and Environment (CEEMA) Post-Graduation Program in Electrical Engineering Federal University of Santa Maria Brazil

This work proposes an integration of alternative energy sources having the different generating modules connected as current sources. These sources were configured to inject current into a common DC bus. This feature avoids current circulation among sources due to the voltage differences, reducing the stress in the individual generators. A battery bank is a system part, used as an energy accumulator for periods when there is primary energy depletion. The bus voltage is controlled by modulation of a secondary load in parallel with the main load. A DC-DC Boost converter connects each primary source to a common bus, except for the storage system that uses a DC-DC Buck-Boost converter. Finally, it is presented a mathematical analysis through simulated results to show the sources behavior and overall performance when turned into current sources.

关键词： Generators Load modeling Mathematical model Transient analysis Voltage control Inductors Wind power generation

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Connection system of mini and micro power plants to single phase networks of the utilities aiming the insertion of small producers in the electricity market

Connection system of mini and micro power plants to single p...

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Brazilian Power Electronics Conference, COBEP

作者： Ricardo Bertoncello Rafael Cardoso Electrical Engineering Post-Graduation Program Power Processing and Analysis Research Group Federal University of Technology-Paraná Pato Branco Parana Brazil

This paper presents a connection system based on static converters aiming to connect three phase generators of mini and micro hydropower plants to the distribution single-phase rural electric utilities in Brazil. It will be presented the modeling of static converters and the computational simulation results obtained by PSIM software.

关键词： Generators Pulse width modulation Rectifiers Inverters Reactive power Voltage measurement Load modeling

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Cross-platform virtual power analyzer based on IEEE standard 1459–2010

Cross-platform virtual power analyzer based on IEEE standard...

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Brazilian Power Electronics Conference, COBEP

作者： Newton C. Will Lucas Santolin Rafael Cardoso Electrical Engineering Post-Graduation Program Power Processing and Analysis Research Group Federal University of Technology-Paraná Pato Branco Parana Brazil

This paper proposes an open source software implementation of an power analyzer, running in personal computers. The software uses the power definitions presented in the IEEE Standard 1459-2010. This standard defines the power measurement under sinusoidal, nonsinusoidal, balanced, and unbalanced conditions. The software uses the QT framework that provides easy cross platform compilation. Therefore, the software can be easily ported to different platforms such as Windows, Linux and Mac OS. Simulation and experimental results are presented to validate the proposal.

关键词： Software IEEE standards Reactive power Harmonic analysis Instruments Power measurement Power system harmonics

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Bootstrapping neural network regression model for motor drive vibration optimization through genetic algorithm

Bootstrapping neural network regression model for motor driv...

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IET 8th International Conference on Computation in Electromagnetics, CEM 2011

作者： Pereira, F.H. Correa, D.A.P. Da Silva, W.M. Nabetac, S.I. Industrial Engineering Post Graduation Program Nove de Julho University - UNINOVE São Paulo Brazil Navy Technology Center in Sao Paulo - CTMSP São Paulo Brazil Electrical Machine and Drivers Lab. São Paulo University GMAcq/USP São Paulo Brazil

ISBN: (纸本)9781849194686

This work proposes an optimization procedure based on a bootstrapped neural network interpolation approach and the Genetic Algorithm method. The bootstrapped neural network is used to generate designed data sets in order to estimate a mapping from input to output space in an intrinsic experiment in a motor drive vibration study. The optimization procedure is aimed to minimize the motor vibration by adjusting some drive control parameters.

关键词： Vibration analysis

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A new multilevel smoothing method for Wavelet-Based Algebraic Multigrid poisson problem solver

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Journal of Microwaves, Optoelectronics and Electromagnetic Applications 2011年第2期10卷 379-388页

作者： Pereira, Fabio Henrique Prado, Kleber Rogério Moreira Nabeta, Silvio Ikuyo Industrial Engineering Post Graduation Program UNINOVE São Paulo SP Brazil Electrical Machine and Drives Lab GMAcq Escola Politécnica São Paulo SP Brazil

In contrast to the standard algebraic multigrid, the Wavelet-based Algebraic Multigrid method relies more strongly on the smoothing method because the coarse spaces are chosen a priori. So, it is very important to develop new smoother methods, especially for those cases where the classical Gauss-Seidel smoothing method does not give good results. This paper proposes a new multilevel smoothing approach based on projection technique. The proposed smoothing method was applied to smoothing the error in a linear systems issued from finite element solutions of the elliptic equation and the results compared with those obtained from the Gauss-Seidel method. © 2011 SBMO/SBMag.

关键词： Linear systems

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Educational robotics as a learning aid for disabled children

Educational robotics as a learning aid for disabled children

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ISSNIP Biosignals and Biorobotics Conference

作者： Valadao, Carlos Bastos, Teodiano Freire Bortole, Magdo Perim, Victor Celino, Daniel Rodor, Fauzi Goncalves, Agda Ferasoli, Humberto Electrical Engineering Post-Graduation Program Universidade Federal Do Espírito Santo1 Fernando Ferrari Av. 514 29075-910 Vitória Brazil Universidade Estadual Paulista Av. Eng. Luiz Edmundo C. Coube 14-01 17033-360 Bauru-SP Brazil

ISBN: (纸本)9781424482122

Severe disabled children have little chance of environmental and social exploration and discovery, and due this lack of interaction and independency, it may lead to an idea that they are unable to do anything by themselves. This idea is called learned helplessness and is very negative for the child cognitive development and social development as well. With this entire situation it is very likely that the self-steam and mood of this child. Trying to help these children on this situation, educational robotics can offer and aid, once it can give them a certain degree of independency in exploration of environment. The system developed in this work allows the child to transmit the commands to a robot. Sensors placed on the child's body can obtain information from head movement or muscle pulses to command the robot to carry the tasks. Also, this system can be used with a variety of robots, being necessary just a previous configuration. It is expected that, with the usage of this system, the disabled children have a better cognitive development and social interaction, balancing in a certain way, the negative effects of their disabilities. © 2011 IEEE.

关键词： Economic and social effects

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Bootstrapping neural network regression model for motor drive vibration optimization through Genetic Algorithm

Bootstrapping neural network regression model for motor driv...

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IET 8th International Conference on Computation in Electromagnetics (CEM 2011)

作者： F.H. Pereira D.A.P. Correa W. M. da Silva S.I. Nabeta Industrial Engineering Post Graduation Program Nove de Julho University Sao Paulo Brazil Navy Technology Center in Sao Paulo CTMSP Sao Paulo Brazil Electrical Machine and Drivers Laboratory GMAcq/USP São Paulo University Sao Paulo Brazil

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