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 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.
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.
This work investigated the effect of time on the carbonation reaction in synthetic saline solution, under mild conditions and with a controlled pH, aiming the mineral trapping of CO 2 on saline aquifers. The experimen...
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This work investigated the effect of time on the carbonation reaction in synthetic saline solution, under mild conditions and with a controlled pH, aiming the mineral trapping of CO 2 on saline aquifers. The experiments were performed in a glass reactor at 40 °C, 6 hours and atmospheric pressure. The saline solution and solid phase were characterized by Flame Atomic Absorption Spectroscopy (FAAS), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). This work demonstrated that the saline solution pH lowers to approximately 7-8 in the first hour of reaction (initial pH of approximately 10), remaining constant until the end of the reaction. Through the analysis by AAS, it was found that the concentration of Ca ions in the brine decreases with time. A greatest reduction in the Ca ions concentration occurs within the first two hours of reaction, remaining constant in the others hours. The Mg concentration showed the trend of the final concentration remains close to initial concentration, even with the carbonates precipitation. SEM analysis indicated that the precipitates obtained had morphology similar to that found for various forms of calcium carbonate (i.e calcite and aragonite). FTIR analysis shows characteristic bands of carbonates, which agrees with the results of the analysis by SEM.
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...
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.
Graphite nanosheet (GNS) was prepared by physical/chemical method. The polyaniline (PANI)/graphite nanocomposites were synthesized by in situ polymerization of aniline monomer using different amounts (1 to 5 wt%) of g...
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Graphite nanosheet (GNS) was prepared by physical/chemical method. The polyaniline (PANI)/graphite nanocomposites were synthesized by in situ polymerization of aniline monomer using different amounts (1 to 5 wt%) of graphite nanosheets. The formation of graphite nanosheets was confirmed by Transmission Electron Microscope (TEM) and X-ray Diffraction (XRD). The surface morphology of exfoliated graphite and PANI/GNS nanocomposites were studied by the Scanning Electronic Microscopy (SEM). A device for electrical conductivity measurements was developed in this work and the results show that the conductivity of PANI/GNS is dependent of the GNS contents.
In this work we studied the Indirect Carbonation of concrete waste and steel slag in order to find the best conditions of each of then aims the CO 2 storage and find a useful destination of the waste. A complete study...
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In this work we studied the Indirect Carbonation of concrete waste and steel slag in order to find the best conditions of each of then aims the CO 2 storage and find a useful destination of the waste. A complete study was developed with steel slag and the best results were adopted to concrete waste owing the expansion of construction industry in Brazil. The lixiviation with HCl acid, time, rate Liquid/Solid, temperature and concentration of acid was deep studied with a goal to use milder conditions avoiding energy penalty in the industrial process. Therefore a Calcium Carbonate was obtained and the feedstock could be re-used in the industries. The experiments were performed in a glass reactor at atmospheric pressure. The solutions and solid phases were characterized by Flame Atomic Absorption Spectroscopy (FAAS), Scanning Electron Microscopy (SEM) and Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES).
This paper presents a temperature digital control system for performance evaluation of electronic devices under different operating temperatures. The system is based on a thermoelectric module of Peltier effect, which...
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This paper presents a temperature digital control system for performance evaluation of electronic devices under different operating temperatures. The system is based on a thermoelectric module of Peltier effect, which is used for heating or cooling the device under test (DUT). A digital PI controller is designed through simulations with an electric model of the structure, developed in Simulink ® . Based on the parameters and results from simulations, the controller is implemented in Labview ® and experimental results are obtained using a servo amplifier like actuator.
This paper proposes a tuning method for a linear quadratic regulator (LQR) and its application to Uninterruptible Power Supplies (UPS). A performance index is established based on the desired behavior of system variab...
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This paper proposes a tuning method for a linear quadratic regulator (LQR) and its application to Uninterruptible Power Supplies (UPS). A performance index is established based on the desired behavior of system variables, such as maximum values permitted on the states and control law saturation. The tuning method is based on the Q and R weighting matrices, which relate the energy of the state variables involved on the process. From this index it is possible to find an optimal point to reach the required performance. The design procedure is exemplified with an output voltage control of an Uninterruptible Power Supply and dynamic results are presented.
This paper presents recent repetitive control (RP) techniques applied to uninterruptible power supplies (UPS). A proportional-derivative (PD) technique including a feedforward term is implemented as the main controlle...
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This paper presents recent repetitive control (RP) techniques applied to uninterruptible power supplies (UPS). A proportional-derivative (PD) technique including a feedforward term is implemented as the main controller. In addition, recent repetitive control laws are presented and applied to a single phase PWM inverter. It is also presented a new RP approach for repetitive gain adaptation in the presence of cyclic and random disturbances. Results demonstrate the efficiency of each control approach.
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