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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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Analysis and design of an embedded system to aid the navigation of the visually impaired

Analysis and design of an embedded system to aid the navigat...

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2013 4th ISSNIP-IEEE Biosignals and Biorobotics Conference: Biosignals and Robotics for Better and Safer Living, BRC 2013

作者： Guimaraes, Carlos Solon S. Bayan Henriques, Renato V. Pereira, Carlos Eduardo Post Graduate Program in Electrical Engineering - PGPEE Federal University of Rio Grande Do sui - UFRGS Avenue Osvaldo Aranha 103 Porto Alegre RS Brazil

ISBN: (纸本)9781467330244

This article aims to present the methodologies of development, analysis and system design of an Electronic Bengal, with object-oriented and structured methods, trying to establish the main features of these. From this scenario, several methods of system analysis are available for use. Among the studies conducted to develop the system, using automation techniques, are SART (Structured Analysis Real-Time) and UML (Unified Modeling Language) modelings. Each has its peculiarities, both in the way of diagramming and about the script. The project proposes an electronic device with an embedded system that contains a control algorithm to enable vibration and audio electromechanical transducers. The project is an electronic device based on open-source flexible platforms to assist in the orientation and mobility of the visually impaired during their displacement. © 2013 IEEE.

关键词： Embedded systems

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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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SIX-PHASE MACHINE DRIVE SYSTEM BASED ON THREE THREE-LEG CONVERTERS

SIX-PHASE MACHINE DRIVE SYSTEM BASED ON THREE THREE-LEG CONV...

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Brazilian Power Electronics Conference

作者： A. C. N. Maia C. B. Jacobina Federal University of Campina Grande (UFCG) Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE)

ISBN: (纸本)9781479902712

In this paper, a six-phase machine drive system fed by a nine-leg converter is proposed. The drive system is composed of a three three-leg inverters feeding a six-phase induction motor, which is adequate to develop a high power system with voltage rating restrictions. The studied system is compared to the conventional solution and it is demonstrated that the nine-leg converter permits to reduce the harmonic distortion of the machine currents and to decrease the power processed by converter switches. The system model and the PWM strategy are presented. Experimental results demonstrate the feasibility of the proposed system.

关键词： Harmonic Distortion Motor Drive System Ratings of Switches Semiconductor Losses Six-Phase Machine Three-leg Converters

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A portable and low cost solution for EMG using ZigBee, GPRS and Internet to Biomedical applications

A portable and low cost solution for EMG using ZigBee, GPRS ...

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19th IMEKO TC4 Symposium - Measurements of electrical Quantities 2013 and 17th International Workshop on ADC and DAC Modelling and Testing

作者： Silva, D.K.N. Sato, R.M.V. Castro, A.L.S. Electrical Engineering Post Graduate Program Av. Augusto Correa 01 66075-110 Belém - Pará Brazil Faculty of Computer and Telecommunication Engineering Av. Augusto Correa 01 66075-110 Belém - Pará Brazil

ISBN: (纸本)9781629931890

This paper presents a prototype of an acquisition board of electromyographic signals (EMG);an embedded portable, wireless and low cost solution. The system is composed of an EMG acquisition board, Zigbee modules and a device named GPRSx. After acquiring the EMG signal, it is sent through ZigBee wireless technology to GPRSx device. The GPRSx device sends the EMG signal to a server on the Internet by using GPRS wireless technology. Thus, the EMG signal is displayed in a graph on a remote computer. The results are very promising and may serve as a reference in studies for the biomedical area.

关键词： Costs

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Real-time load forecasting for demand side management with only a few days of history available

Real-time load forecasting for demand side management with o...

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International Conference on Power engineering, Energy and electrical Drives, POWERENG

作者： Lukas Neusser Luciane Neves Canha Post Graduate Program in Electrical Engineering Federal University of Santa Maria Santa Maria Brazil

The penetration of distributed generation is growing, and today it is not unusual to see at the same site, equipment that consumes energy working side by side with power sources. To manage and optimize the use of every resource, and to avoid unbalances when the system operates near its limits, the need for very short-term load forecasting is inevitable. In this paper, the use of an already known, fast forecast algorithm, based on double seasonal exponential smoothing is proposed. His real-time usability, with only limited historical data are tested, and the mechanism behind to achieve that are explained. Results, the functionality and reliability on a real world system are also presented and discussed, leading to some concluding remarks at the end of the paper.

关键词： Smoothing methods Real-time systems Indexes Load forecasting Demand forecasting Power engineering

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Modeling and control of the modular multilevel cascade converter based on chopper-cells

Modeling and control of the modular multilevel cascade conve...

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Brazilian Power Electronics Conference, COBEP

作者： B. E. O. B Luna C. B. Jacobina A. C. Oliveira Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) PB Brazil

This paper presents the modular multilevel cascade converter (MMCC) based on chopper-cells suitable to medium and high voltage systems without line-frequency transformers. This converter is characterized by a modular arm structure composed by cascaded chopper-cells with floating dc capacitors. The arm structure requires average voltage control and voltage-balancing control of the dc capacitors. This paper proposes a continuous model and a control method to achieve rigid and stable voltage control of all the floating dc capacitors under common operating conditions. The validity of the theory is confirmed by computer simulation and experiment.

关键词： Capacitors Voltage control Power harmonic filters Harmonic analysis Equations Pulse width modulation Mathematical model

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A fast space-vector algorithm for common-mode voltage elimination in multilevel converters

A fast space-vector algorithm for common-mode voltage elimin...

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Brazilian Power Electronics Conference, COBEP

作者： Luis G. G. P. de Castro Maurício B. R. Corrêa Cursino B. Jacobina Post-Graduate Program in Electrical Engineering - PPgEE- COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande Campina Grande PB Brazil

This paper presents an approach that allows to apply space-vector modulation strategy to eliminate common-mode voltage in multilevel inverters. The strategy is based on the reduction of the space vector diagram and on the choice of switching states in which the common-mode voltage is zero. Results were obtained with a real-time simulator and an experimental platform of a cascaded inverter up to 11-level shows its effectiveness. The influence of dead-time over the algorithm performance is investigated too.

关键词： Inverters Vectors Switches Modulation Equations Mathematical model Switching frequency

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AC-DC-AC Six-Phase Machine Drive System Based on Single-Phase Bridge Converters

AC-DC-AC Six-Phase Machine Drive System Based on Single-Phas...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Victor F. M. B. Melo Cursino B. Jacobina Nady Rocha Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department - Federal University of Campina Grande - UFCG Federal University of Paraiba - UFPB

ISBN: (纸本)9781479902255

This paper presents an ac-dc-ac reversible six-phase machine drive system. It is composed of single-phase bridge converters connected in series in the grid side and single-phase bridge converters connected at the machine phase terminals. The proposed topology eliminates the input isolation transformers and reduces the power processed by converter switches and the harmonic distortion in the grid side. The model and the control strategy have been developed. Simulation and experimental results are presented.

关键词： Ac-dc-ac converters Six-phase machine drive Series-connected converters

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