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

共 246 条记录，以下是171-180 订阅

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Four-wire Shunt Compensator Based on H-bridge Y-Connected Converters

Four-wire Shunt Compensator Based on H-bridge Y-Connected Co...

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： E. L. L. Fabricio C. B. Jacobina V. F. Nobrega Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG)

ISBN: (纸本)9781479940318

This paper investigates a power shunt filter composed by four standard h-bridge converters, acting in four-wire system. Compared with the usual four-wire shunt filters, the proposed converter permits reducing the dc-link voltages, the harmonic distortion or the switching frequency. Suitable control strategies to adjust the filter currents as well as the three dc-link voltages are presented. The PWM strategy is designed to command the converter according to the reference voltage provided by the controllers. Simulation and experimental results are presented.

关键词： Topology Voltage control Capacitors Harmonic distortion Pulse width modulation Shunts (electrical) Inverters

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Six-phase open-end machine conversion system with reduced number of controlled components

Six-phase open-end machine conversion system with reduced nu...

引用

作者： Melo, Victor F. M. B. Jacobina, Cursino B. Rocha, Nady Marinus, Nustenil S. Post-Graduate Program in Electrical Engineering COPELE UFCG Campina Grande Paraíba 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)9781479940325

This paper presents two six-phase open-end machine conversion systems. They are composed of three three-leg converters connected in series to a six-phase machine with open terminals, in an open-end winding connection. The converters use diodes to replace controlled switches, making the conversion system non-reversible and with a reduced number of controlled components. In this case, the machine must work always as a generator. A study concerning harmonic distortion and semiconductor losses is carried out. PWM and control strategies are developed. Simulation and experimental results in order to test these strategies are presented. © 2014 IEEE.

关键词： Energy conversion

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Hybrid open-end and NPC AC six-phase machine drive systems

Hybrid open-end and NPC AC six-phase machine drive systems

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作者： Melo, Victor F.M.B. Jacobina, Cursino B. Rocha, Nady Post-Graduate Program in Electrical Engineering - PPgEE COPELE UFCG Campina Grande Paraíba 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)9781479956982

This paper presents two machine drive system based on a six-phase machine (SPM) and three-leg converters. The machine is composed of two three-phase groups. For the first configuration, one of the groups is connected to a three-leg converter and the other is connected to other two three-leg converters in an open-end winding configuration (see Fig. 4). For the second configuration, one of the groups is connected to a three-leg converter (similar to first one) and the other group is connected to a three-level NPC converter (see Fig. 5). Since the machine two groups are fed differently, the system topology is considered to be hybrid. The purpose of these topologies is to be an alternative configuration, being midway between the conventional six-leg inverter system (see Fig. 1) and the NPC six-leg inverter system (see Fig. 2) and Conventional twelve-leg Open-end inverter system (see Fig. 3). Compared with the conventional six-leg system, the proposed systems permits reducing the power processed by the semiconductor switches and their ratings, the dc-link voltage and the harmonic distortion. On the other hand, the proposed systems constitute less complex alternatives, compared with the open-end and NPC counterparts (see Fig. 3). PWM and control strategies are discussed. Simulation and experimental results are also presented. © 2014 IEEE.

关键词： Topology

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Single-phase AC-AC double-star chopper-cells (DSCC) converter without common DC-link capacitor

Single-phase AC-AC double-star chopper-cells (DSCC) converte...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

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

This paper presents a single-phase AC-AC converter based on Modular Multilevel Cascade Converter (MMCC) with Double-Star Chopper-Cells (DSCC). This structure is composed by three DSCC-legs, the middle leg is shared, and also it does not present a common DC-link capacitor. It is suitable for regenerative low-power AC-AC conversion. The voltage-balancing control is presented to regulate the floating DC capacitor voltages. Furthermore, a grid current and terminal load voltage control is presented to correct the Power Factor (PF) and to ensure sinusoidal waveforms. Details about a designed 16-SM prototype are also presented. The experimental results allow validating the control strategies and the effectiveness of the proposed structure.

关键词： Voltage control Pulse width modulation Capacitors Topology Digital signal processing Inductance Inductors

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Using Brain-Computer Interface to control an avatar in a Virtual Reality Environment

Using Brain-Computer Interface to control an avatar in a Vir...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Berthil Borges Longo Alessandro Botti Benevides Javier Castillo Teodiano Bastos-Filho Post-Graduate Program in Biotechnology Universidade Federal do Esprito Santo Vitoria Brazil Post-Graduate Program in Electrical Engineering Universidade Federal do Esprito Santo Vitoria Brazil

The proposal of this research is to present the development of a tool that might be useful in rehabilitation, for subjects with disability, that suffer from some kind of limbs movement limitation. This tool carries a 3D Virtual Reality Environment (VRE), which emulates the movement of a healthy person, using the immersion of the subject through an avatar. To do so, and test its feasibility, pre acquired motor imagery signals were used to test the VRE as an off-line Brain Computer Interface (BCI) feedback. The subject's brain waves were captured by an Electroencephalography (EEG) equipment. For training the classifier, 45 trials, 25 seconds long, were used, and 15 trials for its validation. Five mental tasks were tested with the BCI, and the one with the best results (imagination of the manipulation of a cube) was used to move the avatar through a virtual room.

关键词： Electroencephalography Brain-computer interfaces Avatars Three-dimensional displays Legged locomotion Training

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An ontology-driven framework to support scenario representation in a 3D operator training simulator

An ontology-driven framework to support scenario representat...

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International Conference on Simulation and Modeling Methodologies, Technologies and Applications (SIMULTECH)

作者： Flávio Torres Filho Maria de Fátima Queiroz Vieira Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Campina Grande Brazil Department of Electrical Engineering Federal University of Campina Grande Brazil

This paper presents a framework to support the development of three-dimensional virtual scenarios for an operator training simulator for electrical systems. Given the need to represent a variety of scenarios of interest, this can be an effort and time consuming task. The proposed framework promotes a systematic approach when building scenarios and is supported by tools from the ontology-based domain. An editing tool is also under construction. As it will be discussed in the paper, this approach resulted in the simplification of the scenario building process which is achieved by interchanging descriptions at different levels of abstraction. The descriptions concern the situation to be represented; plant objects' representation, both visual and behavioural, the latter represented as Coloured Petri Nets (CPN) models.

关键词： Training Ontologies Solid modeling Three-dimensional displays Buildings Substations Virtual environments

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Methodology for analysis of stress level based on asymmetry patterns of alpha rhythms in EEG signals

Methodology for analysis of stress level based on asymmetry ...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Alexandre Geraldo Pomer-Escher Maria Dolores Pinheiro de Souza Teodiano Freire Bastos Filho Post-Graduate Program in Biotechnology Federal University of Espirito Santo Vitoria Brazil Post-Graduate Program in Electrical Engineering Federal University of Espirito Santo Vitoria Brazil Post-Graduate Program in Psychology Federal University of Espirito Santo Av Fernando Ferrari 514 Vitoria Brazil

Stress can affect all people, regardless of age, gender or ethnicity. The human body uses stress as an adaptive response against several situations, but it can cause physical, mental or emotional distress. In stress situation the nervous system evokes the same physiological responses, whatever the type of stress and these responses cause changes in the physical, cognitive, emotional and social performance. This paper proposes to develop a methodology for analyzing the stress level using electroencephalographic signals (EEG) based on asymmetry patterns of alpha waves. The subjects of this research are professionals from Vitoria's Fire Department. Activities of the Central Nervous System are capture using Emotiv Epoc Headset, placed on the volunteer's scalp. The signals are analyzed from the frontal cortex at positions Fp1 (AF3), Fp2 (AF4), F3 and F4, according to of the international 10-20 system. The results are analyzed together with some peripheral physiological signals, such as: heart beat rate (ECG), peripheral blood flow, skin conductance, breath rate, body temperature and change in level of salivary cortisone. In addition, a psychological assessment of voluntary's stress is performed through a questionnaire of LIPP-ISS (Inventory of Symptom Stress). A validation study is conducted through a comparison with data available in literature, as well as with evaluation conducted by a psychologist. The results are analyzed in order to get a correlation between EEG signals and physical, mental or emotional stress.

关键词： Electroencephalography Stress Psychology Physiology Temperature sensors Skin Temperature measurement

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Comparison between wire and wireless EEG acquisition systems based on SSVEP in an Independent-BCI

Comparison between wire and wireless EEG acquisition systems...

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

作者： Richard M. G. Tello Sandra M. T. Müller Teodiano Bastos-Filho Andre Ferreira Post-Graduate Program of Electrical Engineering (PPGEE). UFES Vitoria Brazil Department of Computer and Electronics (CEUNES) Brazil

This paper presents a comparison between two different technologies of acquisition systems (BrainNet36 and Emotiv Epoc) for an Independent-BCI based on Steady-State Visual Evoked Potential (SSVEP). Two stimuli separat... 详细信息

关键词： Visualization Electrodes Indexes Accuracy Brain-computer interfaces Synchronization Feature extraction

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Comparison among feature extraction techniques based on power spectrum for a SSVEP-BCI

Comparison among feature extraction techniques based on powe...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Javier Castillo-Garcia Sandra Müller Eduardo Caicedo Anibal Cotrina Teodiano Bastos Post-Graduate Program of Electrical Engineering Federal University of Espirito Santo Vitoria Brazil School of Electrical and Electronic Engineering Univesity of the Valle Cali Colombia

This paper presents a comparison among three methods for Steady-State Visually Evoked Potentials (SSVEP) detection. These techniques are based on Power Spectral Density Analysis (PSDA) and Canonical Correlation Analysis (CCA). The first method estimates the signal-to-noise ratio of the power spectrum in each stimulus frequency using PSDA, which is called Traditional-PSDA. The second analysis estimates the relation between the difference of the stimulus frequency and its neighbor frequencies, using the power spectrum in these neighbor frequencies, and seeks the neighbor frequency which presents the lowest relation value. This technique is referred to Ratio-PSDA. The third and final techniques called Hybrid-PSDA-CCA. The performances of the methods were evaluated using a database of electroencephalogram (EEG) signals. The EEG signals were recorded from 19 volunteers, from which six people present disabilities. They were stimulated with visual stimuli flickering at 5.6, 6.4, 6.9 and 8.0 Hz. The system performance was evaluated considering the accuracy, the Information Transfer Rate (ITR) and the computational cost for several windows length of each stimulus frequency. The results showed that the Hybrid-PSDA-CCA method achieved the best result with an average accuracy of 91.14%.

关键词： Accuracy Electroencephalography Correlation Computational efficiency Equations Educational institutions Brain-computer interfaces

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Measuring the radiation bands of overhead power lines glass insulators

Measuring the radiation bands of overhead power lines glass ...

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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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