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共 131 条记录，以下是71-80 订阅

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Zeta DC-DC Converter with Multilevel Flying Capacitor Switching Cell

Zeta DC-DC Converter with Multilevel Flying Capacitor Switch...

引用

IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Montiê Alves Vitorino Graduate Program in Electrical Engineering (PPgEE-COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

Multilevel power converters have been aim of research in the last years due to their advantages when compared to traditional two-level topologies: better harmonic performance, filters reduction, lower components voltage stress and higher power process capability. Following this trend, the present work proposes two Zeta DC-DC converters composed of multilevel flying capacitor asymmetric totem-pole switching cells. These structures are achieved by replacing one leg of switch/diode of the traditional two-level asymmetric totem-pole switching cell by a similar multilevel flying capacitor switching cell. A generalized structure of the flying capacitor switching cell for $k$ switches is presented. An operation analysis of the proposed converter is presented as well as simulation results to validate the theoretical approach.

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SEPIC DC-DC Converter With Multilevel Flying Capacitor Switching Cell

SEPIC DC-DC Converter With Multilevel Flying Capacitor Switc...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Montiê Alves Vitorino Rhavél Batista Morais Armando J. G. Abrantes-Ferreira Maurício B. de R. Corrêa Graduate Program in Electrical Engineering (PPgEE–COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

Multilevel power converters have been aim of research in the last years due to their advantages when compared to traditional two-level topologies: better harmonic performance, filters reduction, lower components voltage stress and higher power process capability. Following this trend, the present work proposes two SEPIC DC-DC converters composed of multilevel flying capacitor asymmetric totem-pole switching cell. These structures are achieved by replacing one leg of switch/diode of the traditional two-level asymmetric totem-pole cell by a similar multilevel flying capacitor cell. An operation analysis of the proposed converter is presented, as well as hardware-in-the-loop real-time simulation results to validate the theoretical approach.

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

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

引用

Annual Conference of Industrial Electronics Society

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

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... 详细信息

关键词： Heat recovery Heat pumps Resistance heating State-space methods Water heating Heat transfer

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Three-phase Multilevel NPC Rectifier with High-Frequency Pulsating DC-bus, Reduced Number of Switches and Galvanic Isolation with Transformer with Center Tap

Three-phase Multilevel NPC Rectifier with High-Frequency Pul...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Yuri Cavalcanti Ailton Do Egito Dutra Montiê Alves Vitorino Graduate Program in Electrical Engineering (PPgEE–COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

This paper proposes a three-phase three-level AC/DC converter with reduced number of controlled switches and high-frequency DC-bus based on NPC (Neutral Point Clamped) topology, for unidirectional power flow applications. Galvanic isolation is reached by using a center tap transformer, which requires only a full-bridge at it primary side. No bulky electrolytic capacitors are needed on the DC-bus, in contrast to conventional multilevel topologies. A PWM strategy with carriers arranged in alternating phase opposition (PWM-APOD) is used to operate the proposed converter. The applied PWM technique is able to operate the converter stage on the AC side with only two switches commuting per switching period. The switches of the isolated pulsating DC/DC converter are commutated with half the switching frequency of the converter on the AC side. A dual-loop control strategy with PI voltage and PI resonant current controllers is adopted to ensure reference load voltage and almost sinusoidal grid currents. Simulation and experimental results are presented to validate the proposed converter operation.

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Measurement equipment for characterization of ferromagnetic materials

Measurement equipment for characterization of ferromagnetic ...

引用

IEEE Instrumentation and Measurement Technology Conference

作者： Tarcísio Oliveira de Moraes Raimundo Carlos Silvério Freire Débora Albuquerque Vieira Cleonilson Protásio de Souza Post-Graduate Program in Electrical Engineering - PPGEE Federal University of Campina Grande UFCG Campina Grande PB BR Federal University of Campina Grande UFCG Brazil Post-Graduate Program in Electrical Engineering - PPGEE/UFPB Federal University of Paraíba UFPB Brazil Post-Graduate Program in Electrical Engineering - PPGEE/UFPB Federal University of Paraiba João Pessoa Brazil

Ferromagnetic materials have magnetic properties which determine its magnetic field conductivity characteristics. Such characteristics are extremely important for the proper selection and use of these materials in measurement processes, for example. Therefore, this paper presents an equipment for the characterization of ferromagnetic materials constructed in a laboratory. The experimental results of this equipment are acquired and compared with the experimental results obtained with an industrially manufactured apparatus called hysteresisgraph, designed to provide magnetic characterization of magnetic materials. The results of the comparison demonstrate that the equipment presented has low relative error and can be applied in academic projects which require magnetic characterization of ferromagnetic materials developed in the laboratory.

关键词： Magnetic hysteresis Magnetic materials Magnetic flux Magnetic field measurement Magnetic cores Voltage measurement Magnetic fields

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Unidirectional Five-Level Rectifiers for WECS Applications

Unidirectional Five-Level Rectifiers for WECS Applications

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Amanda P. Monteiro Cursino B. Jacobina Bahia Filipe A. C. Sousa Reuben P. R. Post-Graduate Program in Electrical Engineering - PPgEE/COPELE Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil Federal University of Bahia (UFBA) Salvador Brazil

This paper proposes two three-phase five-level power conversion systems. They can be employed in a wind energy converter system (WECS) application as the machine side rectifier, connected to the permanent magnet synchronous machine (PMSM) by an open-end winding (OEW) arrangement. Compared to the conventional topology, proposed ones lack the use of six clamping diodes in their structures. Even though, they also achieve the same power quality as the conventional one. Besides, proposed configurations may have fewer semiconductor devices in the current path, providing slightly lower power losses. Furthermore, the control system used ensures the synchronization between voltage and current, providing a high power factor operation. The converter equations, pulse-width modulation technique, and control strategy are detailed. Simulation and experimental results are provided in order to confirm their performance and feasibility.

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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 ...

引用

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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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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AC-DC-AC nine-phase machine drive system based on H-bridges and three-leg converters

AC-DC-AC nine-phase machine drive system based on H-bridges ...

引用

作者： Melo, Victor F.M.B. Jacobina, Cursino B. Braga-Filho, Edgar R. Cavalcanti, Rodolpho M. De Freitas, Isaac S. Macena, Roberto S. Carlos, Gregory A. De A. Post-Graduate Program in Electrical Engineering - PPgEE COPELE UFCG Brazil Federal University of Campina Grande - UFCG Campiña Grande Paraíba Brazil Federal University of Paraiba - UFPB Joao Pessoa Paraíba Brazil Federal Institute of Technology of Sergipe - IFSE Estancia Sergipe Brazil Federal Institute of Technology of Alagoas - IFAL Palmeira Dos Indios Alagoas Brazil

ISBN: (纸本)9781479940325

This paper presents an ac-dc-ac reversible nine-phase machine drive system. The grid side converter is composed of Y-connected single-phase bridges. As the machine is composed of three three-phase groups, a three-leg converters are connected separately to each group. The topology does not make use of input isolation transformers and reduces the power processed by converter switches when compared to that of conventional two-level converter. Moreover, harmonic distortion in voltages generated by the grid side converter is reduced when compared to conventional two-level converter. The model and the control strategy have been developed. Simulation and experimental results are also presented. © 2014 IEEE.

关键词： Electric inverters

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