This paper presents a parallel implementation approach of selective harmonic compensator for active power filters. This approach uses field programmable gate array (FPGAs) in order to reduce the compensator computatio...
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ISBN:
(纸本)9781467324120
This paper presents a parallel implementation approach of selective harmonic compensator for active power filters. This approach uses field programmable gate array (FPGAs) in order to reduce the compensator computational time. To compensate for even a small number of harmonics digital filters require multiple calculation instructions involving multiplications and additions. Thus, to improve the performance of the computer system it is proposed the digital compensator implementation using parallel structures in FPGA devices. Experimental results are presented to compare the speedup of the proposed parallel approach with the DSP sequential execution time conventionally used in active power filters applications.
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 evaluated thermal comfort conditions in an operating room ventilated with spiral diffuser jet. The objective is to asses conditions of local thermal discomfort of the patient and the surgical team in this ki...
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ISBN:
(纸本)9781627480758
This work evaluated thermal comfort conditions in an operating room ventilated with spiral diffuser jet. The objective is to asses conditions of local thermal discomfort of the patient and the surgical team in this kind of environment using the concept of equivalent temperatures and a manikin with heated sensors. The results showed a very small change in the equivalent temperatures in different parts of the body for the surgeon, the nurse and the patient, It occurs due to the air distribution system with spiral diffuser jet that provides more homogeneous conditions of heat exchange. However, there were higher equivalent temperatures on the head of the surgeon and the nurse and on the patient's chest, because of the heat exchange by radiation with the surgical focus.
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 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 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.
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.
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