“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”

ARRIBA SIEMPRE ARRIBA HASTA ALCANZAR LA GLORIA JORGE CHAVEZ DARTNELL SEPTIEMBRE 1910


SAO PAULO BRASIL

sexta-feira, 17 de outubro de 2014

Participantes destacam atualidade e excelência do Diálogo BRASIL-ALEMANHA


Realizado nos dias 30 de setembro e 1º de outubro, o 3º Diálogo Brasil-Alemanha de Ciência, Pesquisa e Inovação alcançou seus principais objetivos. Com a Matemática como tema central, o evento buscou incentivar a troca de informações e ideias entre profissionais de diversas áreas ligadas à ciência. O evento, organizado pelo Centro Alemão de Ciência e Inovação – São Paulo, aconteceu na Biblioteca Mário de Andrade.

O engenheiro Armando Cavero Miranda, presente no evento, elogiou a escolha do tema do Diálogo Brasil-Alemanha, já que vê uma grande necessidade de incentivar os jovens a seguir carreira nessa área. “Existe uma preocupação em muitos países, como o Brasil e a Alemanha, em se criar um estímulo entre os jovens para que continuem estudando Matemática, porque ela está em todas as áreas da tecnologia, na indústria ou na ciência”, afirmou Miranda, que também elogiou a organização do evento e a escolha dos palestrantes.

O engenheiro destacou a apresentação de Marcelo Viana da Silva sobre o programa Profmat, especialização para os professores de Matemática do Brasil. “É preciso difundir novas tecnologias didáticas, que estão sendo desenvolvidas tanto no Brasil quanto em outros lugares. Para os países sustentarem seu desenvolvimento, precisam de mais engenharia e matemática.”

Para o participante Odilon Otávio Luciano, professor do Instituto de Matemática e Estatística da Universidade de São Paulo, a organização do evento foi impecável e proporcionou excelentes oportunidades de contato. A qualidade do conteúdo também foi ressaltada por ele.  “O evento foi muito estimulante por tratar de um tema unificador de grande atualidade e ampla abrangência científica. Os painéis exibiram conteúdos com riqueza de diversidade e competência, evidenciando a fertilidade científica do paradigma das redes complexas.”

Organização
Para Marcio Weichert, coordenador do Centro Alemão de Ciência e Inovação – São Paulo (DWIH-SP), os objetivos do Diálogo foram atingidos. “Atraímos um público de alto nível, que incluía estudantes até pesquisadores seniores de diversas áreas do conhecimento.

ARTIGO COMPLETO NO WEBSITE ORIGINAL
http://www.dwih.com.br/index.php?id=182&L=1&tx_ttnews%5Btt_news%5D=723&cHash=cf8365788075697e5eba8f9c8b494f69

quinta-feira, 16 de outubro de 2014

Brasileiro vencedor da Medalha Fields é recebido em Brasília

Control Design of Series Connected MOSFETs for High Voltage Applications




 Control Design of Series Connected MOSFETs for High
Voltage Applications
Mirko Bodach, Lutz Zacharias, Björn Veit, Ringo Lehmann, Bernd Günther, Denny Ehrler
University of Applied Sciences Zwickau, Dr.-Friedrichs-Ring 2A, D-08056 Zwickau, GERMANY,
Mirko.Bodach@fh-zwickau.de, Bjoern.Veit@fh-zwickau.de, Lutz.Zacharias@fh-zwickau.de,
Ringo.Lehmann@fh-zwickau.de, Bernd.Guenther@fh-zwickau.de, Denny.Ehrler@fh-zwickau.de

Abstract
A new electro-mechanical converter concept for renewables needs a special DC / DC converter.
The converter has to transform a voltage of about 8 kV into a lower voltage of about 400 volts
covering a power range of 250 up to 1,000 W. Using this type of converter, semiconductor
switching elements are required, which can handle a voltage of about 8 kV and carrying a direct
current of about 60 mA.

WEB SEMINARY 18/10/2014 -10A.M. Switch Mode Power Supply Measurements using Oscilloscopes

Switch Mode Power Supply Measurements using Oscilloscopes


PRESENTER Johnnie Hancock, Oscilloscope Product Manager, Keysight Technologies Johnnie Hancock is an Oscilloscope Product Manager at Keysight Technologies. He began his career with Hewlett-Packard in 1979 as an embedded hardware designer, and has over 35 years test and measurement experience in various roles for HP, Agilent, and now Keysight Technologies. Johnnie is currently responsible for application support activities and he regularly speaks at technical conferences worldwide. Johnnie graduated from the Universityof South Florida with a degree in electrical engineering.

WHO SHOULD ATTEND

Engineers and technicians testing or debugging switch mode power supplies.

Onde e quando

PreçoData(s)LocalPara mais informações
Gratuito2014-11-18 10:00
Pacific
At Your PCEnroll to view the November 18, 2014 live broadcast
LINK
http://www.keysight.com/main/eventDetail.jspx?cc=BR&lc=por&ckey=2477362&nid=-536902447.0&pid=1000001736%3Aepsg%3Apgr

segunda-feira, 13 de outubro de 2014

Design and Implementation of a Fuzzy Adaptive Sliding-Mode Voltage Control System for Three-Phase UPS Inverter Khawar Naheem DIVISION OF ELECTRONIC AND ELECTRICAL ENGINEERING DONGGUK UNIVERSITY SEOUL




 ( Abstract )
Nowadays, the nonlinear nature of electric loads leads to a strong demand of a high-quality and reliable power source both by the customers and utilities. To address this issue, the uninterruptible power supplies (UPSs) are extensively employed for the critical loads such as communication systems (i.e., data centers), medical support systems, semiconductor manufacturing systems, etc. For improving the power quality using UPS system, it is important to achieve the sinusoidal output voltage waveform with very low total harmonic distortion (THD) regardless of the load types. Typically, the inverter with LC output filter in the UPS system is a suitable solution to fulfill this requirement. The main criteria to evaluate the regulation performance of the UPS inverter output voltage are fast dynamic response, small steady-state error, and low THD. Furthermore, the various load conditions (abrupt load changes, unbalanced load, and nonlinear load) including parameters uncertainties extremely degrade the performance of the UPS inverter. Thus, an appropriate control strategy is desired to sufficiently meet the performance criteria of the UPS systems under any type of electrical loads and uncertainties.
LINK
http://www.mediafire.com/view/wg9c9ogcdtpdz46/FUZZY_INVERTER.pdf

Robust Control of a Grid Connected 3 Phase 2 Level Photo Voltaic Inverter and Development of an Inverter Operating SW Using Test Driven Development Approach Ahn, Kyung Pil


Robust Control of a Grid Connected 3 Phase 2 Level Photo
Voltaic Inverter and Development of an Inverter Operating
SW Using Test Driven Development Approach

Ahn, Kyung Pil
(Supervisor Lee, Young Il)
Dept. of Control and Instrumentation Eng.
Graduate School of Industry and Engineering
Seoul National University of Science and Technology

This study discusses robust control of grid connected three-phase two-level photo voltaic inverter where LC filter is used and its reliable implementation method for the system.
The suggested control method uses the cascaded strategy in which inner-loop controller for the ac current control and outer-loop controller for the dc-link voltage are used. In the inner-loop ac current controller, it is important to maximize convergence rate and keep the stability at the same time. So the optimal controller design method based on the LMI (Linear Matrix Inequality) is used with the integration action. Though this method, it can achieve high performance in term of tracking the reference as well as eliminate the offset-error. More over it guarantees system stability even when there are parameter mismatch by considering the parameter uncertainty set. In the outer-loop dc-link controller the PI controller is used with the dc-ac current linearization. So it can have concurrent performance though overall inverter operating condition.
On the other hand, the high power product such as three-phase photo voltaic inverter is in the mission-critical area due to its riskness of an accident. More over the photo voltaic inverter system become more an more complex with increasing requirement of functions in the grid connection rule for each country. With these trend it is difficult to keep the system integrity. This study shows the cases how the inverter operating SW can be builded using Test Driven Development (TDD) approach.
LINK
http://www.mediafire.com/view/bd7kt3oq2d6n34g/CONTROL_INVERTER_PHOTOVOLTAIC.pdf