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

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Fault tolerance performance of two hybrid six-phase drive systems under single-phase open-circuit fault operation 32

Fault tolerance performance of two hybrid six-phase drive sy...

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32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017

作者： Melo, Victor F. M. B. Jacobina, Cursino B. Rocha, Nady Filho, Edgar R. B. Post-Graduate Program in Electrical Engineering PPgEE - COPELE - UFCG Campina Grande Paraíba Brazil Federal Institute of Pernambuco IFPE Afogados da Ingazeira Brazil Electrical Engineering Department Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Federal University of Paraíba - UFPB - João Pessoa Paraíba Brazil

ISBN: (纸本)9781509053667

This paper discusses the fault tolerance performance of two hybrid six-phase drive systems under single-phase open-circuit fault. The topologies are considered to be hybrid because each of the two three-phase groups of the six-phase machine is connected to a different type of converter. One group is connected to a two-level converter and the other group is connected to a dual converter in an open-end arrangement. A compensation strategy is discussed in order to keep the rated operation even after the occurrence of the fault. The six-phase machine mathematical model after the fault is presented and utilized to elaborate the compensation strategy. Simulation and experimental results show the validity of the discussed solutions. © 2017 IEEE.

关键词： Timing circuits

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Single-Phase AC-DC-AC Current Source Converter With Reduced DC-Link Oscillation

Single-Phase AC-DC-AC Current Source Converter With Reduced ...

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Applied Power Electronics Conference and Exposition

作者： Louelson A. Costa Montiê A. Vitorino Maurício B. R. Corrêa Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande (UECG) Campina Grande - PB - Brazil Department of Electrical Engineering Federal University of Campina Grande (UECG) Campina Grande - PB - Brazil

ISBN: (纸本)9781509053674

In this work it is presented an AC-DC-AC synchronization technique that aims to reduce the DC-link current oscillation. The technique is applied to a reduced component count single-phase back-to-back Currente Source Converters (CSC). The deduction of how the DC-link oscillation is influenced by both input and output angles is presented. Experimental and simulation results are provided to validate the theoretical approach and to illustrate the synchronization phenomenon.

关键词： CSC illustrate synchronization phenomenon

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System identification of a pilot scale heat exchanger: A state-space realization approach 42

System identification of a pilot scale heat exchanger: A sta...

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42nd Conference of the Industrial Electronics Society, IECON 2016

作者： Lima, Rafael B. C. Barros, Péricles R. Acioli, George Post-graduate Program in Electrical Engineering PPgEE COPELE UFCG Brazil Electrical Engineering Department Fed. University of Campina Grande Brazil

It is presented a state-space realization approach for identification of a pilot scale heat exchanger plant. The proposed methodology is a computational efficient way to estimate state-space models from experimental d...

ISBN: (纸本)9781509034741

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Asymmetrical cascaded three-phase AC-DC converters with injection transformers

Asymmetrical cascaded three-phase AC-DC converters with inje...

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IEEE Energy Conversion Congress and Exposition

作者： Joao Paulo R. A. Mello Cursino B. Jacobina Post-Graduate Program in Electrical Engineering (PPgEE/COPELE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil

ISBN: (纸本)9781509029990

In this paper, three configurations of three-phase ac-dc cascaded converters are presented. They are referred as basic configurations, and are composed by two three-phase bridges, where the second bridge is cascaded to the first by means of a three-phase injection transformer. Basic configurations have one bidirectional option (composed only by IGBT switches), and two unidirectional ones (composed by IGBT and diodes). Their generalizations, which are composed by an indefinite number of cascaded three-phase bridges, are also proposed. Each additional cascaded bridge is a three-phase IGBT bridge and requires one additional three-phase injection transformer. Transformers turns ratios are calculated in order to maximize the number of levels produced in the ac side of each rectifier, enhancing power quality. Basic configurations are compared by means of simulations between themselves and with the conventional three-phase IGBT bridge, to show that proposed multilevel rectifiers present better performance in terms of ac power quality drew from the ac source, with lower semiconductor losses. Experimental results are also exposed for the basic configurations to validate them and show their feasibility.

关键词： Bridge circuits Insulated gate bipolar transistors Topology Semiconductor diodes Legged locomotion Integrated circuit modeling Mathematical model

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Bio-inspired antenna for UWB systems 1

Bio-inspired antenna for UWB systems

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1st International Symposium on Instrumentation Systems, Circuits and Transducers, INSCIT 2016

作者： Da Silva, Paulo Fernandes Freire, Raimundo Carlos Silverio Serres, Alexandre Jean Rene Da Fonseca Silva, Paulo Henrique Costa E Silva, Jefferson Post-Graduate Program in Electrical Engineering -COPELE Federal University of Campina Grande UFCG Campina Grande Brazil Post-Graduate in Electrical Engineering PPGEE Federal Institute of Paraiba João Pessoa Brazil

ISBN: (纸本)9781509033027

In this paper is presented a new printed monopole antenna, bio-inspired by jasmine flower, that meets the Federal Communications Commission parameters for ultra-wideband systems. The design of the printed monopole antenna in jasmine flower has developed from a printed monopole antenna with circular geometry, with comparison results. The measured results of bio-inspired antenna in the jasmine flower showed compatibility with the parameters required by the FCC for ultra-wideband technology. It obtained bandwidth of 9.75 GHz, half-power beamwidth of 148 degrees, omnidirectional radiation pattern, gain of 5.99 dBi, power spectral density below -41.3 dBm across the bandwidth of ultra-wideband technology, small pulse distortion, and constant group delay, with variations of less than 2ns. © 2016 IEEE.

关键词： Bandwidth

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Computing derivatives in interval type-2 fuzzy logic systems trained by steepest descent method for fault classification in a switch machine

Computing derivatives in interval type-2 fuzzy logic systems...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Eduardo P. de Aguiar Renan P. F. Amaral Marley M. B. R. Vellasco Moisés V. Ribeiro Industrial and Mechanical Engineering Departmant and Electrical Engineering Post-Graduation Program Federal University of Juiz de Fora Juiz de Fora/MG Brazil Electrical Engineering Department Pontifical Catholic University of Rio de Janeiro Rio de Janeiro/RJ brazil

ISBN: (纸本)9781509060351

A switch machine is an electromechanical device that allows railway trains to be guided from one track to another. Among all possible faults that can occur in a switch machine, the three mains ones are: lack of lubrication, lack of adjustment and malfunction of a component. Aiming to classify these faults, an important contribution of this work is to address the height type-reduction and interval singleton type-2 fuzzy logic system derivatives. The computational simulations are performed with real data set provided by a Brazilian company of the railway sector. The obtained results are compared with other models reported in the literature (Bayes theory, multilayer perceptron neural network and type-1 fuzzy logic system), demonstrating the effectiveness of the proposed classifier and revealing that the proposal is able to properly handle with uncertainties associated with the measurements and with the data that are used to tune the parameters of the model. In addition, the convergence speed and performance analysis show that the proposed interval singleton type-2 fuzzy logic system is attractive for classifying faults in a switch machine.

关键词： Fuzzy logic Switches Feature extraction Mathematical model Lubrication Training Uncertainty

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Analysis of the influence of the window used in the Short-Time Fourier Transform for High Impedance Fault detection 17

Analysis of the influence of the window used in the Short-Ti...

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17th International Conference on Harmonics and Quality of Power, ICHQP 2016

作者： Lima, Érica Mangueira Brito, Núbia Silva Dantas De Souza, Benemar Alencar Dos Santos, Wellinsílvio Costa De Andrade Fortunato, Laís Martins Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande - UFCG Campina Grande Brazil Federal University of Campina Grande - UFCG Campina Grande Brazil

ISBN: (纸本)9781509037926

A study on the length and type of the window function used in the Short-Time Fourier Transform (STFT), along with its suitability to extract the harmonic content from a High Impedance Fault (HIF) current is presented on this paper. Additionally, a method to detect HIF based on the phase angle of the third harmonic current is developed. The proposed algorithm performance is evaluated by two database: one containing HIF simulated signals and other containing actual HIF oscillographic records. This paper presents the current state of this research, and, so far, the method is able to detect HIF occurring in different types of surfaces (wet and dry), as well as it is insusceptible to typical noises present in the real oscillograms. © 2016 IEEE.

关键词： Oscillographs

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Event-triggered control co-design for discrete-time systems subject to actuator saturation

Event-triggered control co-design for discrete-time systems ...

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IEEE International Symposium on Computer Aided Control System Design (CACSD)

作者： L. B. Groff L. G. Moreira J. M. Gomes da Silva Department of Automation and Energy (DELAE) Pos-Graduation Program in Electrical Engineering (PPGEE) Porto Alegre-RS Brazil

In this paper we present a method to simultaneously design a static state feedback gain and the trigger function to stabilize discrete-time LTI systems subject to actuator saturation under an event-triggered strategy. We derive LMI-based conditions that ensure local (or global, when possible) asymptotic stability of the origin based on the Lyapunov theory. To tune the parameters, we propose convex optimization problems aiming at reducing the sampling activity. The efficiency of the proposed method is illustrated by numerical examples.

关键词： Actuators Asymptotic stability State feedback Closed loop systems Discrete-time systems Symmetric matrices

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Modeling and control of a XY positioning table 12

Modeling and control of a XY positioning table

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12th IEEE International Conference on Industry Applications, INDUSCON 2016

作者： Moreira, Lucas J. Da S. Dias, Christian C. Lima, Rafael B. C. Barros, Pericles R. Acioli, George Post-Graduate Program in Electrical Engineering-PPgEE COPELE Federal University of Campina Grande-UFCG Campina Grande PB58429-900 Brazil Graduate Program in Electrical Engineering-PGEE Federal University of Campina Grande-UFCG Campina Grande PB58429-900 Brazil Electrical Engineering Department-DEE Federal University of Campina Grande-UFCG Campina Grande PB58429-900 Brazil

ISBN: (纸本)9781509051274

This paper is about modeling and control of a XY positioning table. It is described the construction and instrumentation of a double axis positioning system. It is developed a general electromechanical model, followed by the identification of simplified models for control purposes. At last, it is proposed a PID control strategy, tuned by Internal Model Control (IMC) technique. © 2016 IEEE.

关键词： Three term control systems

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Modified Wilkinson Power Divider and dipole antenna for beamforming systems at 5.8 GHz

Modified Wilkinson Power Divider and dipole antenna for beam...

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International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)

作者： T.C. Albuquerque R.C.S. Freire A.J.R. Serres T.L.V.N. Silva J. Walheim F. Podevin F. Burdin P. Ferrari T. P. Vuong IMEP-LAHC Université Grenoble-Alpes Grenoble France Post Graduation Program in Electrical Engineering (PPGEE-UFCG) Federal University of Campina Grande (UFCG) Federal Institute of Paraiba (IFPB) Paraiba Brazil

Beamforming front-ends are an attractive technology because it concentrates its radiated power in one direction, which can improve energy efficiency and reduce undesirable interference. In this context, electronic beamforming systems have lower cost than mechanical ones. Knowing the uses of directive antennas and power dividers in electronic beamforming systems, this work aims at the design, simulation and measurements of these components at 5.8 GHz. Measurements with Power Divider showed very good return and insertion losses at 5.8 GHz: S 11 = -23.5 dB and S 21 = -3.8 dB. A printed dipole antenna was then fabricated, presenting -14.6 dB of return losses and a 2.82 dBi gain. Later, a 2-antenna beamforming front-end was implemented, proving the beamforming capability with the proposed devices. It also presented S 11 = -15.7 dB, and a high directive gain (10.3 dBi). Since this is still a preliminary work, the results presented are very promising.

关键词： Antenna measurements Dipole antennas Array signal processing Antenna radiation patterns Power dividers Gain Directive antennas

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