quinta-feira, 30 de junho de 2016
Nanotecnologia: Cenário Atual, Inovação e Marco Regulatório - Parte I - Strategic Workshops da UNIVERSIDADE DE SÃO PAULO-BRASIL
Desafios para uma Amazônia Sustentável - A Amazônia como Território para Expansão da Hidroeletricidade?
Publicado em 24/06/2016 Formatos: FLV (640 X 360 px), MP4 (640 X 480 px)
Responsáveis: Sergio Ricardo Villani Bernardo Produção: IEA - Instituto de Estudos Avançados Palestrantes: Ricardo Baitelo, Roberto Kisihinami, Evandro Moretto, Philip Fearnsid
1º Workshop IEEE UFSM UNIVERSIDADE FEDERAL DE SANTA MARIA BRASIL conta com mais de 180 participantes
LINK VIDEO COMPLETO
O 1º Workshop Perspectivas em Aeronáutica e Espaço, promovido pela IEEE e UFSM ocorreu no dia 10 de junho de 2016 no auditório do Centro de Tecnologia da UFSM e contou com a presença de, aproximadamente, 180 participantes dentre estudantes dos cursos de Engenharia Aeroespacial, Engenharia de Controle e Automação, Engenharia Elétrica, entre outros. O evento também reuniu autoridades da UFSM, Exército Brasileiro e Força Aérea Brasileira, além de profissionais e pesquisadores da área. A programação do Workshop contou com a apresentação do Capítulo IEEE e do Ramo Estudantil da IEEE/UFSM, uma mesa redonda sobre a área da Engenharia Aeroespacial e apresentações de trabalhos acadêmicos, além do Minicurso: Modeling, Simulation and Control of Airplanes. O evento pode ser assistido no link: Farol UFSM
sexta-feira, 24 de junho de 2016
UMA CONTRIBUIÇÃO À ANÁLISE DE SOLUÇÕES PARA MITIGAÇÃO DE AFUNDAMENTOS MOMENTÂNEOS DE TENSÃO -RODOLFO RIBEIRO DE OLIVEIRA - UNIVERSIDADE FEDERAL DE ITAJUBÁ PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA
Nos últimos anos, a elevada complexidade da tecnologia empregada no controle dos processos industriais, bem como o aumento de sua vulnerabilidade, levou a consolidação de um grande número de soluções possíveis de serem em-pregadas para mitigar os efeitos nocivos dos afundamentos de tensão. Este cenário tornou a escolha de um método de mitigação em detrimento de outros um processo complexo e que leva a uma exaustiva busca por bibliografias para subsidiar as análises necessárias. Dessa forma, o objetivo desta dissertação é contribuir para a apresentação organizada e estruturada dos principais conceitos e soluções envolvidos no pro-cesso de mitigação dos afundamentos de tensão, abordando desde os sistemas de armazenamento de energia, soluções que utilizam ou não armazenamento de energia até soluções ride-through para acionamentos a velocidade variável. Ademais, por meio de um exemplo de aplicação no qual se propõe o dimen-sionamento de algumas soluções para um processo de uma planta industrial real e o estudo de viabilidade técnica-econômica da implementação destas soluções, al-meja-se também a sensibilização dos agentes do setor para a relevân-cia/viabilidade da realização de estudos.
segunda-feira, 20 de junho de 2016
FIQUEM ATENTOS Ás veces o barato sae caro,E MUITO IMPORTANTE NA HORA DE COMPRAR CONHECER A MARCA,POTENCIA DECLARADA,QUE NORMA TÉCNICA INTERNACIONAL O NACIONAL CUMPRE,O FATOR DE POTENCIA,A DISTORÇÃO HARMÔNICA DE CORRENTE DE ENTRADA (THD),PROTEÇÕES DE SOBRECORRENTE E CURTO-CIRCUITO.
O Inmetro lançou uma cartilha que explora em detalhes as lâmpadas LED, ensinando as melhores maneiras de utilizá-las, as opções com maior durabilidade, e o consumo de energia.
Regulamentadas pelo Inmetro desde 2015, de acordo com o institudo, as lâmpadas LED estão revolucionando o mercado de iluminação. No entanto, o instituto ressalta que saber comprar o produto adequado para cada cômodo faz toda a diferença, já que há uma grande variedade de modelos no comércio. De forma didática e de fácil entendimento, o guia lista as principais dicas e informações para o consumidor.
As lâmpadas LED passarão a ser comercializadas com a Etiqueta Nacional de Conservação de Energia, na qual o consumidor encontrará informações de capacidade de iluminação e eficiência energética, e um comparativo de consumo com a incandescente e fluorescente compacta.
quinta-feira, 16 de junho de 2016
Abstract – In this paper, the development of a cost-effective active power filter/uninterruptible power supply (APF/UPS) system with seamless mode transfer is described. The proposed scheme employs a pulse-width-modulation (PWM) voltage-source inverter and has two operational modes. First, when the source voltage is normal, the system operates as an APF, which compensates for the harmonics and power factor while boosting the DC-link voltage to be ready for the disturbance, without an additional DC charging circuit. A simple algorithm to detect the load current harmonics is also proposed. Second, when the source voltage is out of the normal range (owing to sag, swell, or outage), it operates a UPS, which controls the output voltage constantly by discharging the DC-link capacitor. Furthermore, a seamless transfer method for the single-phase inverter between the APF mode and the UPS mode is also proposed, in which an IGBT switch with diodes is used as a static bypass switch. Dissimilar to a conventional SCR switch, the IGBT switch can implement a seamless mode transfer. During the UPS operation, when the source voltage returns to the normal range, the system operates as an APF. The proposed system has good transient and steady-state response characteristics. The APF, charging circuit, and UPS systems are implemented in one inverter system. Finally, the validity of the proposed scheme is investigated with simulated and experimental results for a prototype APF/UPS system rated at 3 kVA.
Keywords: APF, UPS, Voltage sag, Outages, Compensation, Harmonics, Seamless mode transfer.
A Cost-Effective, Single-Phase Line-Interactive UPS System that Eliminates Inrush Current Phenomenon for Transformer-Coupled Loads Byung-il Kwon Dept. of Electronic Systems Engineering, Hanyang University, South Korea
A Cost-Effective, Single-Phase Line-Interactive UPS System that Eliminates Inrush Current Phenomenon for Transformer-Coupled Loads
Byung-il Kwon Syed Sabir Hussain Bukhari*, Shahid Atiq*, Thomas A. Lipo** and Byung-il Kwon†
Abstract – Sudden voltage drops and outages frequently disturb the operation of sensitive loads for domestic, commercial, and industrial use. In some cases, these events may even impair the functioning of relevant equipment. To maintain power under such conditions, a UPS system is usually installed. Once a disturbance happens at the grid side, the line-interactive UPS system takes over the load to prevent an interruption. But, due to magnetic saturation of the transformer, a significant inrush current may occur for the transformer-coupled loads during this transition. The generation of such transient currents may in turn decrease the line voltage and activates over-current protecting devices of the system. In this work, a cost-effective, line-interactive UPS system is proposed that eliminates the inrush current phenomenon associated with transformer-coupled loads. The strategy was implemented by connecting a standard current-regulated voltage source inverter (CRVSI) to the secondary winding of the load transformer. During any transient condition at the grid side, the load current is monitored and regulated to achieve either seamless compensation of the load current or complete transferal of load from grid to the inverter. Experimental results were obtained for a prototype under all possible operating conditions so as to validate the performance of the proposed topology.
Keywords: UPS systems, Single-phase line-interactive, Inrush current elimination
High Step-up DC-DC Converter by Switched Inductor and Voltage Multiplier Cell for Automotive Applications-Divya Navamani. J , Vijayakumar. K, Jegatheeesan. R and Lavanya. A-Dept. of Electrical and Electronic Engineering, SRM University, India
High Step-up DC-DC Converter by Switched Inductor and Voltage Multiplier Cell for Automotive Applications
Divya Navamani. J † , Vijayakumar. K*, Jegatheeesan. R* and Lavanya. A*
Abstract - This paper elaborates two novel proposed topologies (type-I and type-II) of the high step- up DC-DC converter using switched inductor and voltage multiplier cell. The advantages of these proposed topologies are the less voltage stress on semiconductor devices, low device count, high power conversion efficiency, high switch utilization factor and high diode utilization factor. We analyze the Type-I and Type-II topologies operating principle and mathematical analysis in detail in continuous conduction mode. High-intensity discharge lamp for the automotive application can use the derived topologies. The proposed converters give better performance when compared to the existing types. Also, it is found that the proposed type-II converter has relatively higher voltage gain compared to the type-I converter. A 40 W, 12 V input voltage and 72 V output voltage has developed for the type-II converter and the performances are validated.
Keywords: High step-up, Switched inductor, Voltage multiplier, Steady state analysis, CCM, DCM.
LINK ORIGINAL EN LA WEB
Design of LED Luminaire for Parking Garage - Hao Cui and Si-Hyun Park- Dept.of Electronic Engineering, Yeungnam University, South Korea.
Design of LED Luminaire for Parking Garage Hao Cui* and Si-Hyun Park†
Abstract – This study aims to design a zonal lumen for parking garage LED lightings of a slim appearance and 20 W/2,000 lm capacity and to fabricate a lighting luminaire accordingly. The frame is of a one-dimensional bar type with a reverse V-shaped section, with LED chips arranged along both sides. To maximize the 60° to 80° zonal lumen, the geometric structure was designed with the apex of the reverse V-shaped section at 40° and both sides at 70°. As for the LED light source, focusing lenses with narrower full-width half-maximum (FWHM) in luminous intensity were used. A ray-tracing simulation method was utilized for the zonal lumen simulation of the given structure. An actual hardware of luminaire based on the simulation results was fabricated and characterized. The suggested model is meant to develop LED lightings with a proper level of zonal lumen required in parking garages.
Keywords: LED luminaires, Parking garage, Zonal lumen
LINK FULL PAPER :
A 3 kW Bidirectional DC-DC Converter for Electric Vehicles Arsalan Ansari, Puyang Cheng and Hee-Jun Kim Dept. of Electronic Systems Engineering, Hanyang University,South Korea.
quinta-feira, 9 de junho de 2016
Book electrical measurements is a textbook for students. It sets out the basic concepts of electrical measurement and metrology. Presents the basic methods and means of measurement of non-electrical and electrical quantities, as well as information on the operating principle, the use of the device and the transducers and instruments.
ADVANCED INTELLIGENT CONTROL AND OPTIMIZATION FOR CARDIAC PACEMAKER SYSTEMS by Wei Shi -Department of Electrical and Computer Engineering - Faculty of New Jersey Institute of Technology -2012
ADVANCED INTELLIGENT CONTROL AND OPTIMIZATION FOR CARDIAC PACEMAKER SYSTEMS by Wei Shi
A Dissertation Submitted to the Faculty of New Jersey Institute of Technology in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in Electrical Engineering Department of Electrical and Computer Engineering
LINK ORIGINAL WEB
quarta-feira, 8 de junho de 2016
A Study of Synchronous Rectifier for High Efficiency Multi Output DC-DC Converter - Hyun Jeon -Department of Electronic Engineering-Cheongju University-SOUTH KOREA
A Study of Synchronous Rectifier for High Efficiency Multi Output DC-DC Converter Hyun Jeon Department of Electronic Engineering The Graduate School of Cheongju University. Supervised by Professor Tae-Young Ahn, Ph. D
This paper proposed synchronous rectifier in forward converter including resonance reset did not get efficiency drive waveform for that is existent dead time period. Therefore, proposed synchronous rectifier of new way accordingly to solve problem by happened drive circuit. Confirmed usefulness and practicality by drive circuit that compose experiment circuit and propose through experiment result. Input voltage of experiment circuit are 380V, and output voltage are 12V, and maximum output current is 20A, and maximum output was 100W. And, to report the experimental results the core losses of VRM inductor. The VRM, that has a output voltage 1.5V, output current 60A, maximum power of 90W. Experimental results verify, the VRM has a almost same data of fast transient response, a efficiency test with high flux and ferrite inductor. A maximum power conversion efficiency of the experimental VRM was measured at 92% within 0.2% load regulation.
A STUDY ON AN AC/AC POWER CONVERTER WITH VOLTAGE REGULATION -JEONG-SIK KANG-DEPARTMENT OF ELECTRICAL ENGINEERING -YOSU NATIONAL UNIVERSITY-SOUTH KOREA
A STUDY ON AN AC/AC POWER CONVERTER WITH VOLTAGE REGULATION -JEONG-SIK KANG-DEPARTMENT OF ELECTRICAL ENGINEERING -YOSU NATIONAL UNIVERSITY-SOUTH KOREA
AUTHOR: JEON-SIK KANG
THESIS FOR THE DEGREE OF MASTER OF SCIENCE DEPARTMENT OF ELECTRICAL ENGINEERING.-GRADUATE SCHOOL YOSU NATIONAL UNIVERSITY
terça-feira, 7 de junho de 2016
DESIGN AND IMPLEMENTATION OF DIGITAL DIMMING ELECTRONIC BALLAST -Advisor: He Jinman Graduate Student: Wang Ming Shan-CHUN YUAN CHRISTIAN UNIVERSITY
DESIGN AND IMPLEMENTATION OF DIGITAL DIMMING ELECTRONIC BALLAST
Advisor: He Jinman Graduate Student: Wang Ming Shan China 2002 CHUN YUAN CHRISTIAN UNIVERSITY .
This thesis aims to present the design and practice of a digital electronic ballast for fluorescent lamps. It introduces the characteristics of lamp, DC/DC converter, power factor correction circuit IC 6561, and resonant circuit IC 6574, The electronic ballast is developed by using IC 6561and IC 6574, and other circuits to meet the need for high power factor, long lamp life, high luminous efficiency, and dimming control. Also the circuit operation principle, analysis of carefully designed circuit parameters, practical consideration of self-excitation, and dimming control are explained in detail .The test of real design is carried out at last, and the result shows the proposed digital electronic ballast can fulfill the design purposes.
3-Phase Hybrid Series Active Power Filter System with Instantaneous Voltage Compensation (Seok - Woo Han) - Ph.D Program in Department of Electrical Engineering The Graduate School of Konkuk University-SOUTH KOREA
3-Phase Hybrid Series Active Power Filter System with Instantaneous Voltage Compensation
Seok - Woo Han
Ph .D Program in Department of Electrical Engineering The Graduate School of Konkuk University (Under the Supervision of Prof . Gyu - Ha Choe )
A B S T RA CT
This paper present s the 3- phase hybrid series active filter in order to compensate for harmonics currents , voltage fluctuating and voltage unbalance in power systems . The electric power systems are based on an alternating current and voltage which are sinusoidal in nature. Computers and sensitive electronic control equipment in industrial and commercial plants demand a high quality electric power supply . With significant development of power electronics technology , the proliferation of nonlinear loads such as static power converters has deteriorated power quality in power systems . Notably , nonlinear loads resulted in harmonic distortion , become a serious problem in many industrial equipment . Therefore, utility power quality has become an important issue recently .
DEVELOPMENT AND APPLICATION OF PWM CONVERTERS WITH SOFT-SWITCHING CELLS -JIN-CHYUAN HUNG - INSTITUTE OF ELECTRICAL ENGINEERING TAIWAN REPUBLIC OF CHINA
DEVELOPMENT AND APPLICATION OF PWM CONVERTERS WITH SOFT-SWITCHING CELLS -JIN-CHYUAN HUNG
A DISSERTATION SUBMITTED TO INSTITUTE OF ELECTRICAL ENGINEERING
COLLEGE OF ENGINEERING- NATIONAL CHUNG CHENG UNIVERSITY
IN PARTIAL FULFILLMENT OF THE REQUIRIMENTS FOR THE DEGREE OF DOCTOR
OF PHILOSOPHY IN ELECTRICAL ENGINEERING
JANUARY 2005- TAIWAN,REPUBLIC OF CHINA
LINK FULL THESIS
segunda-feira, 6 de junho de 2016
A Novel Design of an Adaptive PID Controller for Cardiac Pacemaker Achu Govind K. Aravind Sekhar Vinod B.- Dept. of Electronics and Communication, Mohandas College of Engineering, Kerala University, Trivandrum- Kerala, India
Biomedical engineering deals with the application of various concepts of engineering in the field of medicine and biology mainly for health care purposes thereby improving patients quality of life. Out of the various techniques, the primary focus is to develop a reliable and optimized technique for electro simulation of heart. The present work deals with an improvement in the design of control system for regulating the heart rate of a pacemaker in an efficient way. An Adaptive PID controller based on the Delta rule and Adaptive Correction Factor is proposed in this paper. The Adaptive PID controller is implemented using an Adaptive Loop incorporating MIT rule with the Delta rule. The PID parameters are modified by an Adaptive Correction Factor. Simulation results were performed on the developed cardiovascular system of humans and results show that the proposed adaptive PID controller produces superior control performance than conventional PID controller. Simulations were done in Matlab/Simulink.
Keywords: Adaptive PID Controller, Adaptive Correction Factor, MIT Rule, Delta Rule, Pacemaker, Heart Rate.
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