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Brazilian Power Electronics Conference, COBEP

作者： Cleiton M. Freitas Edson H. Watanabe Luís F. C. Monteiro Rio de Janeiro State University Rio de Janeiro Brazil Electrical Engineering Program - COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil Post-Graduate Prog. of Electronic Eng. Rio de Janeiro State University Rio de Janeiro Brazil

ISBN: (纸本)9781665421300

This work presents an analysis of the grid-forming Modular Multilevel Converter (MMC), in the frequency domain, when it is controlled through single or dual-loop implementation. The dual-loop approach presents an inner current-loop control gathered with the external voltage-loop control, whereas the single-loop only presents a voltage-loop control for the grid-forming capability. In both cases, the control algorithms were implanted in a natural reference frame, including resonant controllers. The paper follows an impedance-modeling approach for introducing the analytical representation of the MMC in the frequency domain. These representations are, in fact, the linearized Teéenin-equivalent models of the single- and dual-loop grid-forming MMC. The results showed that the inner current-loop control is a feasible approach for damping specific resonant peaks of the Thevenin-equivalent impedance. In other words, the current-control loop adds a resistive parcel in MMC impedance in the frequency range in which the resonant peaks appear. As a consequence, the LC resonance between this impedance and the capacitor bank in the main bus is damped. The article also contains some switching-level EMTDC/PSCAD simulations to validate the work.

关键词： Damping Analytical models Shape Frequency-domain analysis Capacitors Resonant frequency Switches

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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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Fuzzy logic technology in reactive power control

Fuzzy logic technology in reactive power control

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： P.Y. Ekel L.D.B. Terra M.F.D. Junges A.V. Prakhovnik F.J.A. De Oliveira A. Melek R. Kowaltschuk T.Y. Taguti Post Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil Institute for Energy Savings and Energy Management National Technical University Kharkov Polytechnic Institute Kiev Ukraine Transmission System Operation Superintendence Parana State Energy Company Curitiba Parana Brazil

This paper presents results of research aimed at improving efficiency of coordinated on-line control of reactive power on the basis of developing models, methods, and a control system, integrating traditional numerical techniques with fuzzy logic technology. An approach associated with experimental design is considered to construct diverse types of sensitivity indices, which serve as the basis for multi-attribute evaluating efficiency of control actions and, therefore, for forming rules included in a knowledge base. Procedures related to classifying power system states are presented. Questions of the construction and tuning of linguistic variables as well as rational implementation of fuzzy logic procedures are discussed.

关键词： Fuzzy logic Reactive power control Power system modeling Fuzzy control Fuzzy set theory Power system control Power systems Control system synthesis Design for experiments Expert systems

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ADHD Diagnosis through Resting-State EEG Frequency Analysis with Random Forest

ADHD Diagnosis through Resting-State EEG Frequency Analysis ...

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

作者： Guilherme R. Pedrollo Leia B. Bagesteiro Alexandre R. Franco Alexandre Balbinot Post-Graduate Program in Electrical Engineering Universidade Federal do Rio Grande do Sul Porto Alegre Brazil Department of Kinesiology San Francisco State University San Francisco USA Child Mind Institute The Nathan Kline Institute for Psychiatric Research NYU Grossman School of Medicine New York USA

ISBN: (数字)9798350371499

ISBN: (纸本)9798350371505

Attention-deficit hyperactivity disorder (ADHD) affects about 5% of the population. In order to minimize ADHD effects, it is important to identify its biomarkers. We analyzed electroencephalographic (EEG) signals using a random forest (RF) classifier optimized with a genetic algorithm (GA) to find differences between control and ADHD groups. Data from 856 participants were analyzed with a preprocessing procedure that included artifact subspace reconstruction (ASR) and independent component analysis (ICA). After preprocessing and GA optimization, the RF classifier achieved 88.6% total average accuracy considering the theta frequency band. This outcome suggests that this approach has great potential as a biomarker analyzer for ADHD diagnosis.

关键词： Filters Quality control Independent component analysis Forestry Biomarkers Feature extraction Electroencephalography Optimization Genetic algorithms Classification tree analysis

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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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electrical power quality improvement by using electricity treatment system

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AIP Conference Proceedings 2024年第1期3039卷

作者： Heddy Darmawan Charles O. P. Marpaung Periaman Sirumapea Post Graduate Program of Electrical Engineering Universitas Kristen Indonesia (UKI) Jakarta Indonesia Electrical Engineering Department Universitas Kristen Indonesia (UKI) Jakarta Indonesia

This publication aims to provide the most significant knowledge for advancing power quality using an electricity treatment system. The voltage between neutral and ground (NEV) has been confirmed to be zero volts for safety reasons. The NEV must be zero volts, especially concerning modern computer hardware or the time of 4-O. Regulator Sed device regulators will receive inaccurate data if the NEV is more significant than zero volts or higher than the value set in NEC 2020, which differs from what the industrial factory wants. Additionally, a human exposed to high NEV may risk an electric shock. The Electricity Treatment System was developed to improve the electrical power quality, including NEV and other electrical characteristics.

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Functional movement modeling for robot-assisted upper limb rehabilitation: The case of a simulated reduced-freedom anthropomorphic manipulator

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Revista Brasileira de Engenharia Biomedica 2012年第1期28卷 3-10页

作者： Abadia, Fernando Gonçalves Santiago, Paulo Roberto Pereira de Oliveira, Marco Antônio Assfalk Vieira, Marcus Fraga Post-graduate Program of Electrical and Computer Engineering Federal University of Goiás - UFG Goiânia Go Brazil School of Physical Education and Sport of Ribeirão Preto University of São Paulo - USP Ribeirão Preto SP Brazil School of Electrical and Computer Engineering Federal University of Goiás - UFG Goiânia Go Brazil Laboratory for Bioengineering and Biomechanics Federal University of Goiás - UFG Mail Box 131 Zip Code 74001-940 Goiânia Go Brazil

This paper presents the results of an on-going investigation into the use of an anthropomorphic robotic manipulator with three degrees of freedom (two DOF shoulder joint and one DOF elbow joint) for rehabilitation of a human upper arm. The reduction to three DOF for this manipulator allows for a simpler project, leading to a lower cost of production and maintenance: important factors for its intended wide-spread use in financially restricted areas, e.g., the state of Goiás, Brazil. The project focuses on determining the variations observed for a class of trajectories known as functional movements. These functional movements are trajectories realized when a limb is used for a given function, e.g., combing the hair. In this present paper we use three functional movements: hair combing, bringing a cup to one's mouth and a waving movement. We describe how these functional movements are acquired from test subjects and compared in computer simulations to the equivalent functional movements of our proposed reduced-order anthropomorphic manipulator. Our research indicates that the errors incurred in using a reduced-order shoulder joint are well within the observed variation in the functional movements of human subjects, when compared among different subjects and also between similar functional movements of any one given human subject. Despite the limitations, the proposed manipulator would be viable for rehabilitation of patients in early phases of a stroke, at lower cost of production.

关键词： Patient rehabilitation

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MODAL ANALYSIS OF A METALLIC VIA HOLE BY THE WCIP

MODAL ANALYSIS OF A METALLIC VIA HOLE BY THE WCIP

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SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference

作者： Georgina K. de F. Serres Alexandre J. R. Serres Raimundo C. S. Freire Henri Baudrand Post-Graduate Program in Electrical Engineering - COPELE Federal University of Campina Grande UFCG L.A.P.L.A.C.E-G.R.E ENSEEIHT

ISBN: (纸本)9781467394932

This paper presents a new electromagnetic modeling of a via-hole using a Wave Concept Iterative Procedure. There are specific TM modes associated with the insertion of the via-hole influencing the incident and reflected waves, called the "via's modes". The formulation and results are presented considering the influence of one and two via's mode. The advantage of the model presented is the possibility to simulate planar circuits with a layer and a via-hole considering the effects of the field that propagates around the via.

关键词： WCIP Via Hole TM Mode Propagation Constant

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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 ...

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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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Proposal of methodology for analysis of stress level based on EEG signals

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BMC Proceedings 2014年第4期8卷 1-1页

作者： Alexandre Pomer-Escher Teodiano Bastos-Filho Maria Dolores Souza Post-Graduate Program in Biotechnology Federal University of Espirito Santo Vitoria Espirito Santo 29650000 Brazil Post-Graduate Program in Electrical Engineering Federal University of Espirito Santo Vitória spirito Santo 29075910 Brazil Post-Graduate Program in Psychology Federal University of Espirito Santo Vitória Espirito Santo 29075910 Brazil

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