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IEEE Conference on Antenna Measurements & Applications (CAMA)

作者： Pedro H. V. Rocha Glauco Fontgalland PPgEE-COPELE Post-Graduate Program in Electrical Engineering Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Campina Grande-PB Brazil

In this paper the characteristics radiation of overhead power lines glass insulators is investigated. Two feeding possibilities are used to analyze the radiation effects. The first feeding point is placed on the cap of the insulator and the second one is connected to the pin. The reflection coefficient (S 11 ) for two insulators covering the band of 30 MHz to 1 GHz was measured. The measurements were performed on insulators with different conservation states: one has a metal frame in good condition and the other one has both cap and pin parts rusted. The measured results show bands with good impedance matching (30 MHz to 200 MHz). The cleaned insulator reached S 11 = -18.7 dB at 127 MHz while -10.87 dB at 121.2 MHz was obtained for the rusty insulator. These spectral bands can be used in the analysis of insulator's conservation state and its interference characteristics.

关键词： Insulators Pollution measurement Transmission line measurements Glass Magnetic fields Resonant frequency Reflection coefficient

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Model reference adaptive voltage control of photovoltaic boost converter

Model reference adaptive voltage control of photovoltaic boo...

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Power Electronics and Control (SEPOC), Seminar on

作者： Andrei Da Cunha Lima Lucas Vizzotto Bellinaso Leandro Michels Graduate Program in Electrical Engineering (PPGEE)) Federal University Of Santa Maria (UFSM)

ISBN: (数字)9798350379419

ISBN: (纸本)9798350379426

This article aims to present a methodology for adaptive control of a boost converter through two loops based on a Model Reference. This methodology makes it possible to reduce the input capacitance of the boost converter, increasing the response speed and consequently the efficiency of tracking the maximum power point. In the introduction section, the problem involving the reduction of input capacitance in boost converters is presented. In the next sections, mathematical modeling of the converter is carried out, and a model for voltage transfer function related to inductor’s current was obtained, and finaly a model for current transfer funcion related to duty-cycle. The last section presents simulation results, demonstrating the stability of controller under several parametrics variations. Finnaly, a comparison among an adaptive controller and a classical controller was presented.

关键词： Seminars Adaptation models Simulation Transfer functions Capacitance Mathematical models Stability analysis Power electronics Adaptive control Voltage control

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Design Space Exploration of Embedded Systems for Intelligent Maintenance

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IFAC Proceedings Volumes 2013年第7期46卷 133-138页

作者： E. Lazzaretti M. Zuccolotto C.E. Pereira R.V.B. Henriques Electrical Engineering Graduate Program (PPGEE) Av Osvaldo Aranha esq Sarmento Leite Porto Alegre RS Brazil

With the development of intelligent maintenance techniques, the embedded systems that will be used with such algorithms will need increasingly to present more flexibility, combined with high processing speed and low power consumption. Within this context, model based programming associated with automatic platform-specific code generation capabilities are of great interest. This work performs a design space exploration of some algorithms commonly used on intelligent maintenance applications, in this case wavelet package energies and logistic regression, by analyzing the performance and required footprint of different implementations for intelligent maintenance algorithms when executed in hardware and software. Starting point for the comparison was the so called Watchdog Agent™ IMS system, which is currently available both in MATLAB™ and LabVIEW™ environments. Using available code generation tools distinct hardware and software versions are deployed and both the performance of the generated systems as well as some energy and memory metrics of the resources used in FPGA implementations are compared For the validation tests, vibration data collected from a test bench composed by an electric mechanical actuator was used and obtained results confirmed a great variability of the generated solutions in terms of the assessed metrics, clearly indicating that best solution may vary depending on the application requirements.

关键词： Intelligent Maintenance Watchdog Agent™ FPGA Embedded systems Automatic code generation

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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...

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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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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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Seven level asymmetric inverters with coupled inductors 13

Seven level asymmetric inverters with coupled inductors

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13th IEEE Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference, COBEP/SPEC 2016

作者： Bueno, Diego A. Acevedo Leal Da Silva, Juliano C. Da Silva, Edison Roberto C. Andrade, Abinadabe Silva Dias, Tulio Albuquerque Post-graduate Program in Electrical Engineering - PPgEE/COPELE Federal University of Campina Grande Campina Grande PB Brazil Federal University of Campina Grade/LEIAM COPELE Campina Grande PB Brazil Federal University of paraíba/GEPAME CPGEE João Pessoa PB Brazil

ISBN: (纸本)9781479987795

This paper proposes two seven level asymmetric inverter with coupled inductors that enable a reduction in the number of controlled switching devices. However, the lack of redundant states and difference in the maximum pole voltages reduce the performance of the inverters due to higher winding currents and saturation of magnetic core. For mitigating those issues, a coupled inductor with elevated magnetizing inductance is used. The operation principle, conducting states and modulation strategy are described. Simulation and experimental results demonstrate the feasibility of proposed topology. © 2015 IEEE.

关键词： Pulse width modulation

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PARALLEL AC-DC SINGLE-PHASE ASYMMETRICAL BOOST RECTIFIERS

PARALLEL AC-DC SINGLE-PHASE ASYMMETRICAL BOOST RECTIFIERS

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Annual Conference of the IEEE Industrial Electronics Society

作者： Nustenil S. M. L. Marinus Cursino B. Jacobina Nady Rocha Rodolpho M. B. Cavalcanti 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)9781479940318

In this paper, three unidirectional single-phase rectifiers are proposed. Each converter is composed of two non-controlled legs and two controlled legs. Modelling and control strategy of the system, including a synchronization method, are proposed. In the synchronization method, the grid current is synchronized with the generated voltage ensuring a sinusoidal grid current without zero-crossover distortions. Analysis of harmonic distortion and semiconductor losses are presented. Simulation and experimental results are shown for validation purposes.

关键词： Topology Synchronization Voltage control Legged locomotion Harmonic distortion Inductors Semiconductor diodes

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Seven level asymmetric inverters with coupled inductors

Seven level asymmetric inverters with coupled inductors

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Brazilian Power Electronics Conference, COBEP

作者： Diego A. Acevedo Bueno Juliano C. Leal da Silva Edison Roberto C. da Silva Abinadabe Silva Andrade Tulio Albuquerque Dias Post-graduate Program in Electrical Engineering - PPgEE/COPELE Universidade Federal de Campina Grande Campina Grande PB BR Post-graduate Program in Electrical Engineering - PPgEE/COPELE Federal University of Campina Grande Campina Grande PB Brazil COPELE Federal University of Campina Grade/LETAM Campina Grande PB Brazil

关键词： Topology Inductors Switches Windings Inductance Modulation Capacitors

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AC MOTOR DRIVE SYSTEM BASED ON A CUSTOM DESIGNED STRONTIUM FERRITE MOTOR)

AC MOTOR DRIVE SYSTEM BASED ON A CUSTOM DESIGNED STRONTIUM F...

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Brazilian Power Electronics Conference

作者： Marcos A. A. Costa Edgar R. Braga-Filho Antonio M. N. Lima Graduate Program in Electrical Electrical Engineering - PPgEE Universidade Federal de Campina Grande - UFCG

ISBN: (纸本)9781479902712

Exploit the flux concentration configuration is a good alternative for designing a relatively low cost synchronous motor based on ferrite magnets. This paper discusses the design of an ac motor drive system based on a permanent magnet motor in which both the use of low cost ferrites and minimization of cogging torque have been adopted as design criteria. The dynamic modeling as well as the parameter identification of the motor have been performed. Simulation and experimental results are presented to demonstrate the correctness of the methodology and the feasibility of proposed motor drive solution and its related feedback control laws.

关键词： Permanent magnet motor Ac motor drive system Feedback control system

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Verification of light-source uniformity in a portable setup for digital camera characterization 18

Verification of light-source uniformity in a portable setup ...

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18th IMEKO TC4 Symposium on Measurement of electrical Quantities 2011, Part of Metrologia 2011

作者： Fernandes, Édilla M. Gonçalves De Campos Glória, Henrique C. De Lima Monteiro, Davies W. Moreira, Luiz F. Etrusco Department of Electrical Engineering - DEE Graduate Program on Electrical Engineering - PPGEE Universidade Federal de Minas Gerais UFMG Av. Antonio Carlos 6627 - Pampidha Belo Horizonte-MG31270-010 Brazil Invent Vision Ltda Belo Horizonte-MG Brazil

ISBN: (纸本)9781634394338

This work presents a flexible, low-cost and portable setup that allows the characterization of digital cameras based on the EMVA 1288 standard. Instead of using expensive equipment as an integrating sphere, we propose a properly evaluated simple light source based on a translucent glass surface. To make this possible it is necessary to understand the uniformity aspects of this surface and to map its interference by means of a characterization procedure. The method proposed basically subtracts the non-uniformity map of the original light source allowing its use as a flat field surface. An optical setup was developed to extract data for the uniformity verification. It is basically composed by a digital camera, a frosted-surface light source, an extension tube and a translation stage. Some preliminary results are presented showing the validity of this approach. Copyright © 2011 by the International Measurement Confederation (IMEKO) All rights reserved.

关键词： Standardization

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