This paper presents the description of a DC electronic load based on an interleaved chopper converter to determine the biasing and dynamics characteristics of either fuel cells (FCs) and photovoltaic panels (PVs). Var...
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This paper presents the description of a DC electronic load based on an interleaved chopper converter to determine the biasing and dynamics characteristics of either fuel cells (FCs) and photovoltaic panels (PVs). Variable loads are used for experimental data acquisition of I-V power supply characteristics in a way that several operating points can be easily obtained. Laboratory load current tests using ordinary power resistors are not an easy solution due to their size, cost and overall weight. To resolve that it is proposed in this paper that the current through electronically varying loads can give better resolution to the I-V characteristics of FC and PV sources. The interleaved operation of the chopper converter ensures an input high frequency current ripple, reducing so the input LC filters size and converter volume. The converter transfer function is analyzed and controllers are designed to obtain a fast dynamic response and insure good stability in steady state operation. It is presented the converter operating principles, operating states and design. The simulated and results are compared to each other in order to prove the electronic load effectiveness in acquiring the I-V biasing curves of fuel cells and photovoltaic panels.
This work presents a combination of the Model-View-Controller pattern with the Evolutionary Acquisition Interdisciplinary Research Project Management for web services *** intends to promote an increase in productivity...
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This work presents a combination of the Model-View-Controller pattern with the Evolutionary Acquisition Interdisciplinary Research Project Management for web services *** intends to promote an increase in productivity and to facilitate interdisciplinary web services *** consists of an independent database for users' feedback that together with technological opportunities and evolving threats considerations may start a new release of the system allowing a dynamic evolution through acquiring new features or correcting errors,but the new release decision is not *** other words,web service evolution is accomplished adding requirements analysis into the Model-View-Controller pattern,which is incorporated into Interdisciplinary Research Project Management.
The present work describes the simulation to be used in the control of a mechanical arm using a Visual Evoked Potential to drive a Brain Computer Interface system. The signal processing and classifying was done using ...
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The present work describes the simulation to be used in the control of a mechanical arm using a Visual Evoked Potential to drive a Brain Computer Interface system. The signal processing and classifying was done using the Multiple Coherence K 2 N . The proposed classifier was able to detect the difference between four different frequencies presented at the same time. The Multiple Coherence classifier had a hit rate of 95%.
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 ...
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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.
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 w...
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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.
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 t...
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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.
This paper presents a complete AC small-signal general model for the interleaved buck converter (IBC) operating in continuous conduction mode. Average state-space technique is used and the most important parasitic ele...
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This paper presents a complete AC small-signal general model for the interleaved buck converter (IBC) operating in continuous conduction mode. Average state-space technique is used and the most important parasitic elements are included. A ready-to-use generalized model for n-cells structure is developed by obtaining its DC model and AC small-signal model for a certain operation point. Besides, it is presented an n-cells inductor value analysis against duty-cycle and a second-order model is derived from that, which can replace the complete model with accuracy, simplifying the dynamics analysis. Models have been successfully verified experimentally, and compared via simulation in Matlab/Simulink.
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 or...
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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.
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 dev...
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This paper presents a discussion about a methodology to obtain the main parameters of solar panels and power converters in photovoltaic systems. This study is essential to obtain the maximum power transfer from the PV...
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This paper presents a discussion about a methodology to obtain the main parameters of solar panels and power converters in photovoltaic systems. This study is essential to obtain the maximum power transfer from the PV source to the mains grid or a load. It is also presented a formal mathematical model based on the experimental data acquisition of the key parameters of a photovoltaic cell which are: shunt and series resistances, photo generated current, the ideality factor and the diode reverse saturation current.
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