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检索条件"机构=Post-Graduate Program in Electrical Engineering - PpgEE - COPELE"

共 131 条记录，以下是121-130 订阅

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Three-phase AC-DC Isolated Rectifier with Single-Transformer Excited by the Common Mode Voltage and ZVS Capability

Three-phase AC-DC Isolated Rectifier with Single-Transformer...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Vitor Freire Bezerra Montiê Alves Vitorino Jean Torelli Cardoso Paulo Peixoto Praça Graduate Program in Electrical Engineering (PPgEE–COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG) Campina Grande Brazil Departamento de Engenharia Elétrica (DEE) Universidade Federal do Ceará (UFC) Fortaleza Brazil

ISBN: (数字)9798350376067

ISBN: (纸本)9798350376074

This paper proposes a new three-phase AC-DC isolated rectifier topology with zero-voltage switching capability. The structure is obtained by adding a single transformer that is excited by the common-mode voltage generated by the three-leg converter. It is presented an analysis of the converter's operation, covering modulation concepts and control strategies to maintain the output voltage at the desired value and guarantee unity power factor and very low total harmonic distortions. The experimental results is obtained over a 1kW prototype which provides a power factor of 0.99 and efficiency of 91.7%. The full results are presented and discussed to validate the proposed converter topology.

关键词： Reactive power Total harmonic distortion Simulation Rectifiers Prototypes Zero voltage switching Transformers Topology Voltage control Periodic structures

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Distributed approach for channel quality estimation using dedicated nodes in industrial WSN

Distributed approach for channel quality estimation using de...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Ruan D. Gomes Gláucio B. Rocha Abel C. Lima Filho Iguatemi E. Fonseca Marcelo S. Alencar Informatic Coordination Federal Institute of Paraíba Guarabira Paraíba Brazil Informatic Center Federal University of Paraíba João Pessoa Paraíba Brazil Mechanical Engineering Department Federal University of Paraíba João Pessoa Paraíba Brazil Post-Graduate Program in Electrical Engineering - PPgEE - Copele Campina Grande Paraíba Brazil

ISBN: (纸本)9781479949113

A way to deal with the variations in the link quality of Wireless Sensor Networks (WSN) is the use of strategies for Dynamic Channel Allocation (DCA). The first step to perform DCA is estimating the channel quality, so that the network nodes can decide if a channel change is needed, and the best channel to be used. This paper proposes a distributed approach with nodes dedicated to monitor channel quality, by using the Received Signal Strength Indication (RSSI) and the Link Quality Indicator (LQI) to identify low quality channels. This approach is acceptable in industrial WSN, since the network deployment can be performed with adequate planning. Furthermore, the sensor nodes do not need to stop their operation for monitoring the channel quality. As a first step, experiments were performed in a real industrial environment to identify the relation between RSSI and LQI traces, and the Packet Error Rate for different channels, by using IEEE 802.15.4 radios operating in the 2.4 GHz band.

关键词： Interference Wireless sensor networks Channel estimation Measurement Transceivers Monitoring IEEE 802.15 Standards

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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

Annual Conference of Industrial Electronics Society

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

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.

关键词： Inverters Topology Harmonic distortion Pulse width modulation Voltage control Rotors Capacitors

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A Family Of Single-Phase Current Source Converters With Double Outputs

A Family Of Single-Phase Current Source Converters With Doub...

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Annual IEEE Applied Power Electronics Conference and Exposition

作者： Louelson A. Costa Maurício B. R. Corrêa Montiê A. Vitorino Gutemberg G. dos Santos Darlan A. Fernandes Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Department of Electrical Engineering Federal University of Campina Grande (UFCG) Campina Grande - PB - Brazil Department of Electrical Engineering Federal University of Paraiba (UFPB) Joao Pessoa - PB - Brazil

ISBN: (纸本)9781467395519

This work introduces a family of Current Source Converters (CSCs) that allows to control single-phase AC converters with two outputs independently sharing the same DC-bus. It is presented four different topologies which have their own advantages and disadvantages compared to each other. The comparison criterias are the total number of switches, the number of conducting switches per switching cycle, quadrant operations and DC-bus current. One of the topologies needs to always have four conducting switches with full-quadrant operation (named Fq4c), while another topology (Lq2c) needs only two, however with limited-quadrant operation. The last two presented topologies have three conducting switches in a switching period, one with full-quadrant operation (Fq3c) and another with limited-quadrant operation (Lq3c). Also it is presented the Scalar Pulse Width Modulations (SPWMs) to control each converter with switching optimization. Details of the topologies, operation and modulation logic are presented. Simulations and experimental results are provided to validate the theoretical approach.

关键词： SPWMs Family Single-Phase Current Source Converters Double Outputs

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

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

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International Conference on Harmonics and Quality of Power

作者： #x00C9 rica Mangueira Lima Núbia Silva Dantas Brito Benemar Alencar de Souza Wellinsílvio Costa dos Santos Laís Martins de Andrade Fortunato Post-Graduate Program in Electrical Engineering - PPgEE Federal University of Campina Grande - UFCG Campina Grande Brazil Electrical Engineering Department (DEE) Federal University of Campina Grande - UFCG Campina Grande Brazil Undergraduate student in Electrical Engineering Department (DEE) Federal University of Campina Grande - UFCG Campina Grande Brazil

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.

关键词： Harmonic analysis Time-frequency analysis Signal resolution Fourier transforms Impedance Conductors

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A Single-Phase Five-Level Grid-Connected Inverter for Photovoltaic Applications

A Single-Phase Five-Level Grid-Connected Inverter for Photov...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Jadyson J. Silva A. C. Bahia Filipe P. N. Tahim Andre Darlan A. Fernandes Fabiano F. Costa Post-graduate Program in Electrical Engineering PPGEE- UFBA Salvador Bahia Brazil Federal University of Bahia- UFBA Salvador Bahia Brazil Federal University Federal University of Paraíba - UFPB João Pessoa Paraíba Brazi

With the increasing energy demands and environmental impacts from conventional energy sources, especially fossil fuels, renewable energy sources are increasingly popular. Among which, photovoltaic (PV) energy generation systems stands out due to their ease of installation, maintenance and low acquisition cost. Single-phase PV systems connected to the grid are commonly used in small and medium-sized residential and commercial installations. This paper proposes a single-phase five-level inverter for grid-connected PV systems. A PWM technique is applied to balance the voltages across the dc-link capacitors. Moreover, the technique has a suitable performance in terms of conducting and switching losses. The results shows the effectiveness of the technique for injecting suitable low distorted currents into the grid. Moreover, the system operates correctly to balance the voltages across the dc-link capacitors and under abrupt changes of the available power from the PV panels.

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Three-phase four-wire AC-DC-AC multilevel topologies obtained from an interconnection of three-leg converters

Three-phase four-wire AC-DC-AC multilevel topologies obtaine...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Ayslan C. N. Maia Cursino B. Jacobina Nayara B. Freitas Antonio P. D. Queiroz Edison R. C. Silva Post-Graduate Program in Electrical Engineering - PPgEE Federal University of Campina Grande (UFCG) Campina Grande PB Brazil Federal Institute of Alagoas (IFAL) Palmeira dos Indios AL Brazil Federal Institute of Paraiba (IFPB) Picui PB Brazil

ISBN: (纸本)9781509007387

This paper investigates three AC-DC-AC multilevel topologies for three-phase four-wire (3P4W) applications obtained from an interconnection of three-leg voltage source converters (VSCs). The topologies provide bidirectional power flow and can be applied in line voltage regulators, universal active power filters and uninterrupted power supplies (UPS). Operating principles, a pulse-width modulation (PWM) technique and an overall control strategy are developed. The PWM and control strategies are suitable to regulate the DC-link voltage and to optimize the harmonic distortion, reducing switching stress and power losses. Simulation results are used to compare the proposed configuration with a conventional solution in terms of harmonic distortion and semiconductor losses. Experimental results are presented to validate the theoretical considerations and were obtained by using IGBTs with dedicated drives and a digital signal processor (DSP) with appropriated plug-in boards and sensors.

关键词： Voltage control Topology Legged locomotion Capacitors Pulse width modulation Harmonic distortion Power conversion

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A New Approach for SSVEP Detection Using PARAFAC and Canonical Correlation Analysis

A New Approach for SSVEP Detection Using PARAFAC and Canonic...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Richard Tell Saeed Pouryazdian Andre Ferreira Soosan Beheshti Sridhar Krishnan Teodiano Bastos Post-Graduate Program in Electrical Engineering (PPGEE). UFES. Av. Fernando Ferrari 514. Vitoria Brazil. Department of Electrical and Computer Engineering. Ryerson University. 350 Victoria St Toronto ON M5B 2K3 Canada.

ISBN: (纸本)9781424492695

This paper presents a new way for automatic detection of SSVEPs through correlation analysis between tensor models. 3-way EEG tensor of channel x frequency x time is decomposed into constituting factor matrices using PARAFAC model. PARAFAC analysis of EEG tensor enables us to decompose multichannel EEG into constituting temporal, spectral and spatial signatures. SSVEPs characterized with localized spectral and spatial signatures are then detected exploiting a correlation analysis between extracted signatures of the EEG tensor and the corresponding simulated signatures of all target SSVEP signals. The SSVEP that has the highest correlation is selected as the intended target. Two flickers blinking at 8 and 13 Hz were used as visual stimuli and the detection was performed based on data packets of 1 second without overlapping. Five subjects participated in the experiments and the highest classification rate of 83.34% was achieved, leading to the Information Transfer Rate (ITR) of 21.01 bits/min.

关键词： EEG SSVEPs PARAFAC

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Group Delay Analysis of Folded Multi-layer C-Sections Used in Encoding of Chipless RFID Tag

Group Delay Analysis of Folded Multi-layer C-Sections Used i...

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SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference

作者： Raquel Aline Araujo Rodrigues Edmar Candeia Gurjao Francisco Marcos de Assis Smail Tedjini Etienne Perret Post-Graduate Program in Electrical Engineering - COPELE Radiometry Research Group Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Grenoble Institute of Technology/LCIS

ISBN: (纸本)9781467394932

Researches on modern wireless identification methods have been focused on RFID techniques and in particular on chipless solutions. A parametric study of folded multi-layer C-sections fabricated on flexible substrates and a chipless RFID tag with single group of folded C-sections are presented in this paper. Full-wave simulations have been done for the folded multi-layer C-section and the chipless RFID tag. The obtained results confirm the feasibility of the utilization of this concept with multi-layer C-sections in temporal multi-frequency encoding technique based on group delay. It has been found that the techniques with folded multi-layer structure offer a significant amount of group delay and highly narrow band delay peaks.

关键词： Chipless RFID Tag Folded multi-layer C-sections Group delay

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Cascaded Three-Phase H-Bridge Converter Applied as Series Active Compensator for DFIG-Based Wind Energy Conversion Systems

Cascaded Three-Phase H-Bridge Converter Applied as Series Ac...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Ítalo A. Cavalcanti de Oliveira Cursino Brandão Jacobina Emerson de Lacerda Soares Nady Rocha Post-Graduate Program in Electrical Engineering (PPgEE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil Federal University of Campina Grande (UFCG) Campina Grande Brazil Federal University of Paraíba (UFPB) João Pessoa Paraíba Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

This paper presents the use of an active series compensator to improve the performance of wind energy conversion systems (WECS) using a grid-connected doubly-fed induction generator (DFIG) during grid disturbances. The series active compensator is based on a two-level three-phase inverter cascaded with three H-bridge inverters operating with floating capacitors and without using injection transformer. The converter operating principles and control strategies are discussed. Steady-state simulations were obtained for the DFIG with constant torque. Experimental results are also presented. It was verified that the proposed system is able to maintain sinusoidal and compensated voltages on the DFIG stator windings, even during a distorted grid voltage sag event.

关键词： Stator windings Doubly fed induction generators Capacitors Voltage control Rotors Reactive power

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