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检索条件"机构=Post Graduation Program in Electrical Engineering - PPGEE"

共 235 条记录，以下是171-180 订阅

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Empirical ARMA Indoor Propagation Model for WLAN Signals in 2.4GHz

Empirical ARMA Indoor Propagation Model for WLAN Signals in ...

引用

European Conference on Antennas and Propagation

作者： Ramz L. Fraiha Lopes Allan B. Costa Herminio S. Gomes Nadson W. P. Souza Bruno W. Martins Gervasio P. S. Cavalcante Institute of Technology - Electrical Engineering Post Graduation Program Federal University of Pará - UFPA Belém - PA Brazil

ISBN: (纸本)9781467321877

Representing the signal power at a studied environment through a mathematical model is one major challenge of signal propagation study. In this work is proposed an empirical Autoregressive Moving-Average (ARMA) model for signal strength prediction in indoor environments. A Genetic Algorithm (GA) was employed to calibrate the model (finding coefficients), thus, allowing future improvements without major changes to the program source code.

关键词： WLAN ARMA model Indoor Propagation Genetic Algorithm wireless local area network (WLAN) Genetic Algorithm (GA) Source code signal power propagation Propagation signals INDOORS

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OPEN-END WINDING PERMANENT MAGNET SYNCHRONOUS GENERATOR SYSTEM WITH REDUCED CONTROLLED SWITCH COUNT

OPEN-END WINDING PERMANENT MAGNET SYNCHRONOUS GENERATOR SYST...

引用

Brazilian Power Electronics Conference

作者： Cursino B. Jacobina Nady Rocha Nustenil S. M. L. Marinus Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Electrical Engineering Department (DEE) Federal University of Paraiba (UFPB)

ISBN: (纸本)9781479902712

This paper presents an open-end winding permanent magnet synchronous generator system with reduced controlled switch count, which may be applied to Wind Energy Conversion Systems (WECS). The configuration is obtained from the blend of a three-phase controlled rectifier (composed only of controlled switches), a non-controlled rectifier (composed only of diodes) and an open-end winding machine. A detailed model and a PWM control strategy of the systems, including the synchronism technique are presented to ensure the elimination of zero-crossover distortion normally caused by the use of diodes. Simulation and experimental results are also presented.

关键词： Control Power Converter Synchronous Generator

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Shunt Compensator Based on Three-Phase Interconnected Converters

Shunt Compensator Based on Three-Phase Interconnected Conver...

引用

IEEE Energy Conversion Congress and Exposition

作者： C. B. Jacobina E. L. L. Fabricio A. V. G. Menezes M. B. R. Correa G. A. A. Carlos Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) 58429-900 Campina Grande - PB - Brazil

ISBN: (纸本)9781479903375

This paper investigates a three-phase shunt power filter based on three standard three-phase interconnected converters. Compared with the usual three-phase shunt filter, the proposed converter permits to reduce the dc-link voltages and reduce either harmonic distortion or switching frequency. Control strategies suitable to control the filter and circulating currents as well as the three dc-link voltages are presented. A PWM strategy is designed to command the converter according to the reference voltage generated by the controllers. Simulation and experimental results are presented.

关键词： standard three-phase three reference Converters voltage reference circulating current shunt Shunts (electrical) link voltage Harmonic distortion DC link Filters DC link voltage VOLTAGE

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Unidirectional rectifier based on hybrid modular multilevel cascade converter — Double-star chopper-cells

Unidirectional rectifier based on hybrid modular multilevel ...

引用

Brazilian Power Electronics Conference, COBEP

作者： Italo Roger F. M. P. da Silva Alexandre C. Oliveira Cursino B. Jacobina Camila S. Gehrke Post-graduate Program in Electrical Engineering - PPgEE/COPELE Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Aprígio Veloso Campina Grande-PB Brazil

In this paper a hybrid topology of Modular Multilevel Cascade Converter (MMCC) - Double-Star Chopper-Cells (DSCC) is proposed. This configuration is applied as a unidirectional controlled single-phase rectifier, wherein one of the converter legs is composed by diodes instead of the submodules (SMs) connections. In order to ensure the energy balance among the local SM capacitors, a voltage balancing control strategy is also presented. Besides, a grid current control strategy associated to a method that eliminates zero-crossing distortion caused by the diode leg is proposed, resulting in a power-factor correction (PFC) and a sinusoidal grid current. Experimental results are presented and allow validating the control strategies.

关键词： Voltage control Topology Capacitors Radio frequency Current control Inductors Harmonic analysis

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A NEW MODEL BASED CONTROL STRATEGY FOR ENERGY EFFICIENCY IMPROVEMENT OF INDUCTION MOTORS WITH VARIABLE LOAD

A NEW MODEL BASED CONTROL STRATEGY FOR ENERGY EFFICIENCY IMP...

引用

Brazilian Power Electronics Conference

作者： Jesse de Pelegrin Cesar Rafael Claure Torrico Emerson Giovani Carati PPGEE - Graduation Program in Electrical Engineering UTFPR - Federal University of Technology

ISBN: (纸本)9781479902712

This paper proposes a new control strategy for energy efficiency improvement of three-phase induction motors (TIM) with variable load. Main control is based on Indirect Field-Oriented (IFOC) which shows a good performance of torque and speed. Additionaly it is proposed a new loss model based controller in order to optimize the active power consumed by TIM for different load conditions. Matlab simulations are performed to test the proposed strategy for different loads where the optimal flux is found. The strategy is also tested using PSIM simulation where the drive system is included. To verify the approach in real conditions a motor drive prototype was assembled and experimental results are presented.

关键词： Efficiency Optimization Induction Motor Vector Control

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Development of an intelligent virtual environment applied to mastology for diagnosis and training

Development of an intelligent virtual environment applied to...

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International Conference on Computer Medical Applications (ICCMA)

作者： Jaclason Machado Veras Sofiane Labidi Nilson Santos Costa Thiago Pinheiro Agricultural School of Teresina - CAT Federal University of Piaui - UFPI Teresina Brazil Post-graduation Program in Electrical Engineering Federal University of Maranhão - UFMA São Luís Brazil Post-graduation Program in Electrical Engineering Federal University of Maranhão - UFMA São Luís Brazil

This paper aims to present a proposal for developing an intelligent virtual environment based on multi-agent systems, neural networks, ontology and Fourier transform. Its main purposes are training professionals of health field through e-learning and the diagnosis of diseases affecting mammary glands, providing an improvement in conditions of diagnostics in the medicine area.

关键词： Training Ontologies Virtual environments Neural networks Diseases Breast cancer

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Active Power Line Conditioner based on Modular Multilevel Cascade Converter - Double-Star Chopper-Cells

Active Power Line Conditioner based on Modular Multilevel Ca...

引用

Annual Conference of Industrial Electronics Society

作者： Italo Roger F. M. P. da Silva Alexandre C. Oliveira Cursino B. Jacobina Camila S. Gehrke Victor F. M. B. Melo Post-graduate Program in Electrical Engineering - PPgEE/COPELE Campina Grande-PB Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande-PB Brazil

ISBN: (纸本)9781479902255

In this paper an Active Power Line Conditioner (APLC) is proposed based on a Modular Multilevel Cascade Converter (MMCC) - Double Star Chopper Cells (DSCC) topology. A higher-voltage, low-switching frequency IGBT converter is used to achieve harmonic minimization. Compared to the conventional APLC topology, the proposed approach employs lower DC-link voltage, lower voltage in the power devices, flexible output voltage level, fault protection, less prone to noise, loss reduction, among others features considered in this work. Experimental results show that the proposed active power filter topology is capable of minimizing load harmonics and compensating reactive power at the Point of Commom Coupling (PCC).

关键词： Voltage control Harmonic analysis Capacitors Power system harmonics Radio frequency Topology Inductance

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AC-AC DRIVE SYSTEMS WITH OPEN-END FIVE-PHASE MACHINE AND SIXTEEN-LEG DC-LINK CONVERTER

AC-AC DRIVE SYSTEMS WITH OPEN-END FIVE-PHASE MACHINE AND SIX...

引用

Brazilian Power Electronics Conference

作者： Cursino B. Jacobina Isaac S. de Freitas Lilian G. de Azevedo Mauricio B. R. Correa Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department - DEE - Federal University of Campina Grande - UFCG Alternative and Renewable Energy Center - CEAR Electrical Engineering Department - DEE - Federal University of Paraiba - UFPB

ISBN: (纸本)9781479902712

This paper presents two ac machine drive systems based on three-phase to five-phase ac-ac converters and open-windings five-phase machine. The drive systems are suitable to applications in which high power, performance and reliability are required using low power and voltage switches and low dc-link capacitor voltages. The configuration I employs an input transformer with two secondary taps at the grid side, two three-phase three-leg converters and one ten-leg converter (totalling sixteen legs). The configuration II employs a low-power series transformer at the grid side, two three-phase three-leg converters, and one ten-leg converter. Both configurations permit to reduce the power and voltage ratings of power switches and also the dc-link capacitor size. The paper presents the comprehensive models of the proposed systems, modulation strategies and a general comparison with conventional configuration. Simulated and experimental results are presented.

关键词： Ac-Ac Converter Five-phase Machine Motor Drive Open-end windings Power Converter

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Power hardware-in-the-loop (PHIL) based on FPGA

Power hardware-in-the-loop (PHIL) based on FPGA

引用

Brazilian Power Electronics Conference, COBEP

作者： Camila S. Gehrke Alexandre C. Oliveira Antonio Marcus N. Lima Italo Roger F. M. P. da Silva Universidade Federal de Campina Grande Campina Grande PB BR Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil Post-graduate Program in Electrical Engineering - PPgEE/COPELE

Nowadays, to improve power quality and power demand, several studies point to the use of Active Power Line Conditioners (APLCs) and Distributed Generation (DG), both based on power electronic devices. Considering various distributed power devices with cooperative operation, the strategies evaluation to compensate harmonics and correct power factor (PF) in Electric Power System (EPS) is only possible to be investigated by simulation. In this work, it is proposed a Power Hardware-in-the-loop (PHIL) system for testing the APLCs operation. The proposed PHIL system can evaluate the performance of the APLC control strategies and EPS dynamic response under APLC operation. Furthermore, the same platform can be used to integrating DGs with the EPS as it also uses power electronic devices.

关键词： Field programmable gate arrays Harmonic analysis Digital signal processing Power harmonic filters Power quality

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Three-phase shunt active power filter based on the interconnection of single-phase and three-phase converters

Three-phase shunt active power filter based on the interconn...

引用

Brazilian Power Electronics Conference, COBEP

作者： A. M. Maciel C. B. Jacobina V. B. Melo E. C. dos Santos E. L. L. Fabrício Instituto Federal da Paraíba PB Brazil Electrical Engineering Department (DEE) Federal University of Camnina Grande (UFCG) Camnina Grande PB Brazil Post-Graduate Program in Electrical Engineering-PPgEE-COPELE Department of Electrical and Computer Engineering IUPUI

This paper presents a topology based on the interconnection of single-phase H-bridge converters and a three-phase converter acting as a shunt active power filter. Contributions for the model, PWM approach and control strategies are presented to the studied converter. As compared to the conventional solution by using just H-bridges converters, the proposed one reduces the number of semiconductor and storage devices while keeping the same characteristics of high number of levels. A comprehensive THD analysis will be considered followed by simulated and experimental outcomes.

关键词： Control systems Topology Capacitors Voltage control Shunts (electrical) Pulse width modulation Integrated circuit interconnections

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