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

共 235 条记录，以下是181-190 订阅

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

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

引用

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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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...

引用

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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A multicriteria approach for meter placement in monitoring of smart distribution systems

A multicriteria approach for meter placement in monitoring o...

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International Universities Power engineering Conference (UPEC)

作者： Rafael G. Milbradt Luciane N. Canha Pedro B. Zorrilla Alzenira R. Abaide Paulo R. Pereira Sandro M. Schmaedecke Post-Graduation Program in Electrical Engineering Federal University of Santa Maria-UFSM Santa Maria Brazil State Company of Electric Power Distribution of Rio Grande do Sul CEEE-D Porto Alegre Brazil

One of the principles of Smart Grids is to have a communication network that will integrate equipment allowing the monitoring and operation to be performed in real time in order to improve the quality indicators. However, this migration to an automated and monitored environment will demand many resources that will be used to perform the migration gradually. Therefore, this work proposes a methodology for allocation of meters with the function of improving the accuracy of state estimation algorithms, but also considering other selection criteria, given the fact that many of automation equipment such as reclosers, automated switches, voltage controllers also perform the function of meters. The paper demonstrates the implementation of a state estimator based on the WLS method, which serves as the basis for the analysis of quantitative criteria such as the accuracy of the estimator, losses, voltage levels and reliability. Thus, the criteria are analyzed considering the needs defined by experts through the Analytic Hierarchy Process, so alternatives of locations and equipment can be prioritized. Finally, the methodology is demonstrated by experimental evaluation on a real feeder.

关键词： Indexes State estimation Accuracy Monitoring Measurement uncertainty Reliability Investment

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THREE-PHASE MULTIFUNCTION COMPENSATOR

THREE-PHASE MULTIFUNCTION COMPENSATOR

引用

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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T-slot PIFA with excitation of the ground plane resonant modes and considerations of the interaction between antenna, mobile handset and user's head

T-slot PIFA with excitation of the ground plane resonant mod...

引用

SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： J. L. T. Garzon A. A. de Salles A. C. O. Pedra S. Severo Post-Graduation Program in Electrical Engineering Federal University of Rio Grande do Sul Porto Alegre Rio Grande do Sul Brazil Technology College SENAI National Service of Industrial Education Porto Alegre Rio Grande do Sul Brazil

ISBN: (纸本)9781479913961

This paper presents a T-slot planar inverted F antenna (PIFA) for wireless mobile communications GSM/UMTS/WCDMA systems. A modified ground plane is used to increase the bandwidth. A prototype is implemented and the differences in performance of the antenna with and without the presence of the mobile handset and the user's head are estimated. The simulations are performed using the finite difference time domain (FDTD) method.

关键词： Antennas Multiaccess communication Spread spectrum communication Antenna measurements Finite difference methods Time-domain analysis Microphones

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Simulation of surgical procedures with Jchai3D

Simulation of surgical procedures with Jchai3D

引用

2012 Pan American Health Care Exchanges, PAHCE 2012 - Conference, Workshops, and Exhibits. Cooperation / Linkages: An Independent Forum for Patient Aare and Technology Support

作者： Cerqueira, J.P. Machado, J.G. Ramos, M. Melo, J.S.S. Brasil, L.M. University of Brasilia at Gama Engineering Course Gama Brazil University of Brasilia Electrical Engineering Post-Graduation Program Brasilia Brazil University of Brasilia at Gama Post-Graduation Program of Biomedical Engineering Gama Brazil

ISBN: (纸本)9781467311328

This paper presents the concept of a new platform used to simulate surgical procedures in health field. Jchai3D is a tool which allows easy developing of virtual reality applications. Using this framework is possible to build simulations systems which can be used as educational/training tools. Jchai3D is totally open-source and it is available online for download. In addition, Jchai3D is multiplatform, and it can be executed in several environments like Windows, Linux or Mac OS. © 2012 IEEE.

关键词： Virtual reality

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High step-up voltage gain integrated DC/DC converters

High step-up voltage gain integrated DC/DC converters

引用

2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2012

作者： Dreher, Jacson R. Marangoni, Filipe Ortiz, Jorge L. R. Da S. Martins, Mario L. Camara, Helder T. Flora, Leandro D. Post-Graduation Program on Electric Engineering - PPGEE. INOVAR Research Group UTFPR Pato Branco PR Brazil Control Engineering Department Danfoss Drives Grasten Denmark

ISBN: (纸本)9781467320238

This paper presents a systematic methodology to generate high step-up voltage gain converters based on the combination of two standard DC/DC converters. The converters are combined so that their input sections are integrated reducing the converter component count. Their output sections are associated to derive three basic configurations, the series, the parallel and the cascade outputs. The paper presents as an example, the integration of the boost and flyback converters for which the voltage gain and efficiency in steady state are analyzed. Comparative experimental results among the three integrated boost-flyback laboratory prototypes are carried out. It shows that the Series-IBF and the Cascade-IBF present better and similar performance when compared to the Parallel-IBF converter. © 2012 IEEE.

关键词： Boost converter

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A Multicriteria Approach for Meter Placement in Distribution Systems

A Multicriteria Approach for Meter Placement in Distribution...

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International Conference on the European Energy Market

作者： Rafael G. Milbradt Luciane N. Canha Pedro B. Zorrilla Alzenira R. Abaide Paulo R. Pereira Sandro M. Schmaedecke Post-Graduation Program in Electrical Engineering Federal University of Santa Maria - UFSM State Company of Electric Power Distribution of Rio Grande do Sul - CEEE-D

ISBN: (纸本)9781479925582

关键词： Distribution System Smart Grid State Estimation Meter Placement Multicriterial Analysis

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DC electronic load based on an interleaved chopper converter to determine photovoltaic panel and fuel cell biasing curves

DC electronic load based on an interleaved chopper converter...

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IEEE/IAS International Conference on Industry Applications (INDUSCON)

作者： Jordan G. Trapp João M. Lenz Felix A. Farret Leandro B. Kehler Juliano B. Shoenhalz Center of Studies in Energy and Environment (CEEMA) Post-Graduation Program in Electrical Engineering (PPGEE) Technology Center Federal University of Santa Maria Santa Maria Brazil

This paper presents the description of a DC electronic load based on an interleaved chopper converter to determine the biasing and dynamics characteristics of either fuel cells (FCs) and photovoltaic panels (PVs). Variable loads are used for experimental data acquisition of I-V power supply characteristics in a way that several operating points can be easily obtained. Laboratory load current tests using ordinary power resistors are not an easy solution due to their size, cost and overall weight. To resolve that it is proposed in this paper that the current through electronically varying loads can give better resolution to the I-V characteristics of FC and PV sources. The interleaved operation of the chopper converter ensures an input high frequency current ripple, reducing so the input LC filters size and converter volume. The converter transfer function is analyzed and controllers are designed to obtain a fast dynamic response and insure good stability in steady state operation. It is presented the converter operating principles, operating states and design. The simulated and results are compared to each other in order to prove the electronic load effectiveness in acquiring the I-V biasing curves of fuel cells and photovoltaic panels.

关键词： Fuel cells Resistors Choppers (circuits) Photovoltaic systems Transfer functions Mathematical model

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