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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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Three-phase shunt active power filter based on the interconnection of single-phase and three-phase converters

Three-phase shunt active power filter based on the interconn...

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Brazilian Power Electronics Conference, COBEP

作者： A. M. Maciel C. B. Jacobina V. B. Melo E. C. dos Santos E. L. L. Fabrício Instituto Federal da Paraíba PB Brazil Electrical Engineering Department (DEE) Federal University of Camnina Grande (UFCG) Camnina Grande PB Brazil Post-Graduate Program in Electrical Engineering-PPgEE-COPELE Department of Electrical and Computer Engineering IUPUI

This paper presents a topology based on the interconnection of single-phase H-bridge converters and a three-phase converter acting as a shunt active power filter. Contributions for the model, PWM approach and control strategies are presented to the studied converter. As compared to the conventional solution by using just H-bridges converters, the proposed one reduces the number of semiconductor and storage devices while keeping the same characteristics of high number of levels. A comprehensive THD analysis will be considered followed by simulated and experimental outcomes.

关键词： Control systems Topology Capacitors Voltage control Shunts (electrical) Pulse width modulation Integrated circuit interconnections

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Shunt Active Power Filter With Open-End Winding Transformer and Series Connected Converters

Shunt Active Power Filter With Open-End Winding Transformer ...

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IEEE Energy Conversion Congress and Exposition

作者： G. A. de A. Carlos C. B. Jacobina E. C. dos Santos E. L. L. Fabricio N. Rocha Department of Control and Industrial Process Federal Institute of Alagoas (IFAL) Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Department of Electrical Engineering Federal University of Campina Grande (UFCG) Department of Electrical and Computer Engineering Purdue School of Engineering and Technology (IUPI) Department of Electrical Engineering Federal University of Paraiba (UFPB)

ISBN: (纸本)9781479903375

This paper presents a shunt active power filter based on the concept of open-end winding (OEW) transformers. The proposed configuration is constituted of two converters with three legs each series connected throughout a three-phase OEW transformer. Model PWM strategy and control scheme are presented as well. The main advantage of the proposed system lies on the multi-level waveform generation, which allows reduction of either harmonic distortions or switching losses. This proposed topology is suitable for medium voltage (MV) distribution systems. Simulation and experimental results validate the theoretical study.

关键词： OEW multi-level MV active power filter Transformer power filters multilayers Converters winding (process) shunt Shunts (electrical) Multiple Virtual Storage Theoretical Study

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Power hardware-in-the-loop (PHIL) based on FPGA

Power hardware-in-the-loop (PHIL) based on FPGA

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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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Models of Transit Systems for Optimization of the Grounded Vehicles Fleet

Models of Transit Systems for Optimization of the Grounded V...

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International Conference on Computer Modeling and Simulation, UKSIM

作者： José Artur Lima Cabral Marques Fábio Nogueira da Silva João Viana da Fonseca Neto UNDB Sao Luis Maranhao Brazil DEE-Post Graduate Program in Electrical Engineering and Computer Science-PPGEE Universidade Federal do Maranhão Sao Luis Maranhao Brazil

In order to operate a public transportation system, it is necessary to plan the grounded fleet lines among the various origin/destination spread all over the city to better attend population displacement during the day, which uses the bus transportation system. To improve planning operation of the public transportation system, it is proposed a linear programming model to optimize the overall performance of transit systems, by setting the optimum buses fleet for every bus line of each company constrained to an accepted delay between any two bus stop on the bus circuit but with a minimum profit for the companies. As the routes are different for time to time during the day such as rush hour. The proposed model can cope with all the kinds of patterns during the day and the propose is to optimise the whole transportation system. It is discussed also the complexity of the nature of the dynamic of the transportation system. The mathematical modelling can show us correctly a way to qualify and quantify the routes, what helps to understand the dynamic behavior of the population through time, different situations and epochs. Simulations present the viability of implantation for real time system to estimate the transportation system as it changes.

关键词： Optimization Sociology Statistics Linear programming Vehicles Adaptation models

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Single-phase to three-phase induction generation system with two parallel single-phase half-bridge converters

Single-phase to three-phase induction generation system with...

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Brazilian Power Electronics Conference, COBEP

作者： Nady Rocha Ely C. de Menezes Ítalo A. Cavalcanti de Oliveira Cursino B. Jacobina Electrical Engineering Department (DEE) Federal University of Paraíba (UFPB) Cidade Universitária - João Pessoa PB Brazil Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande (UFCG) Campina Grande PB Brazil

This paper presents a generation system based on the induction generator for wind energy application. The induction generator is connected to single-phase grid through an ac-dc-ac single-phase to three-phase converter. The single-phase converter is composed of two parallel single-phase half-bridge converters. Suitable modelling, including the circulation current, and control strategy are developed. The control of generator is based on the field oriented control. A pulse width-modulation (PWM) technique using a single and double carriers PWM is presented. Proposed topology permits to improve the harmonic distortion. Beside, it can reduce the power losses in the converter. Finally, simulation and experimental results are presented.

关键词： Pulse width modulation Topology Estimation Induction generators Inductance Harmonic distortion

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The Creation and Application of a Simulator in Educational Robotics Classes

The Creation and Application of a Simulator in Educational R...

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IEEE Latin American Robotics Symposium, LARS

作者： Carla Fernandes Sarah Thomaz Renata Pitta Luiz Marcos Goncalves Post-Graduate Program in Electrical and Computer Engineering Federal University of Rio Grande do Norte Natal RN Brazil Department of Computer and Automation Engineering Federal University of Rio Grande do Norte Natal RN Brazil

ISBN: (纸本)9781479934775

Educational robotics classes consist of the use of robots in classes that involve interdisciplinary or social themes, creating innovative learning environments involving the use of such technology. In the usually known approach, educational robotics uses robotics kits. We developed a robotic simulator, called S-Educ, which can be used as an alternative or in association with robotics kits in classes involving the use of robotics. Simulators are not replacements of robotics kits, but an alternative for cases where the kits can not be used or they are not appropriate. Tests were carried out to analyze the use of the simulator, obtaining good results on the application of this simulator in educational robotics classes.

关键词： Robot sensing systems Virtual environments Mobile robots Actuators Wheels

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THREE-PHASE MULTIFUNCTION COMPENSATOR

THREE-PHASE MULTIFUNCTION COMPENSATOR

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Brazilian Power Electronics Conference

作者： E. L. L. Fabricio C. B. Jacobina A. M. Maciel Instituto Federal da Paraiba Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Universidade Federal de Campina Grande

ISBN: (纸本)9781479902712

This work proposes a topology of compensator with the purpose of compensate harmonics and reactive loads or supply the load with balanced three-phase voltages, even when the grid voltage presents harmonics. The topologies have two operation modes. Mode A: acting as shunt active power filter and mode B: acting as ac-dc-ac converter. The model of the system is derived and a suitable control strategy, including the PWM technique, is developed. Experimental results are presented, as well.

关键词： Active Power Filter Parallel Converters Circulation Current Static Converters

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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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Multiple Criteria Analysis for Energy Storage Selection

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Energy and Power engineering 2011年第4期3卷 557-564页

作者： Alexandre Barin Luciane N. Canha Alzenira R. Abaide Karine F. Magnago Breno Wottrich Ricardo Q. Machado Federal University of Santa Maria Post-Graduate Electrical Engineering Program Center for Energy and Environment Studies

In view of the current and predictable energy shortage and environmental concerns, the exploitation of renewable energy sources offers great potential to meet increasing energy demands and to decrease depend- ence on fossil fuels. However, introducing these sources will be more attractive provided they operate in conjunction with energy storage systems (ESS). Furthermore, effective energy storage management is essential to achieve a balance between power quality, efficiency, costs and environmental constraints. This paper presents a method based on the analytic hierarchy process and fuzzy multi-rules and multi-sets. By exploiting a multiple criteria analysis, the proposed methods evaluate the operation of storage energy systems such as: pumped hydro and compressed air energy storage, H2, flywheel, super-capacitors and lithium-ion storage as well as NaS advanced batteries and VRB flow battery. The main objective of the study is to find the most appropriate ESS consistent with a power quality priority. Several parameters are used for the investigation: efficiency, load management, technical maturity, costs, environmental impact and power quality.

关键词： Multiple Criteria Analysis Fuzzy Sets AHP Method Energy Storage Systems Power Quality

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