Lec06 電子學(一) 第二章 Operational Amplifiers

第二章 Operational Amplifiers (1/6) 授課教師：電子物理系 陳振芳教授 課程資訊：http://ocw.nctu.edu.tw/course_detail.... 授權條款：Creative Commons BY-NC-SA 更多課程歡迎瀏覽交大開放式課程網站：http://ocw.nctu.edu.tw/ 本課程同時收錄至國立交通大學機構典藏，詳情請見： http://ir.nctu.edu.tw/handle/11536/10...

The World Economy and the Traditional Confucianism (《新百家學堂》全球經濟與傳統儒學) ( Sun Chen) The impact of globalization on the world economy

NTU Open Forum for New Intellectuals: The World Economy and the Traditional Confucianism (《新百家學堂》全球經濟與傳統儒學) ( Sun Chen) The impact of globalization on the world economy

ELECTRONIC CIRCUITS DR MANAR MOHAISEN PART1 -KOREA UNIVERSITY OF TECHNOLOGY AND EDUCATION

전자회로 한국기술교육대학교 Manar Mohaisen ELECTRONIC CIRCUITS DR MANAR MOHAISEN PART1 -KOREA UNIVERSITY OF TECHNOLOGY AND EDUCATION

On Fault Detection, Diagnosis and Monitoring for Induction Motors-DOCTORAL THESIS-Mohammed Obaid Mustafa Department of Computer Science, Electrical and Space Engineering Signals and Systems

On Fault Detection, Diagnosis and Monitoring for Induction Motors Publication: Research › Doctoral thesis -Mohammed Obaid Mustafa
Department of Computer Science, Electrical and Space Engineering Signals and Systems Research areas Control Engineering

ABSTRACT

In this thesis, multiple methods and different approaches have been established and evaluated successfully, in order to detect and diagnose the faults of induction motors (IMs). The aim of this thesis is to present novel fault detection and isolation methods for the case of induction machines that would have the merit to be implemented online and being characterized by specific novel capabilities, when compared with the existing techniques.

LINK ORIGINAL:http://pure.ltu.se/portal/files/101605364/Mohammed_Obaid_Mustafa.pdf

On High-Frequency Distortion in Low-Voltage Power Systems -Anders Larsson- Luleå University of Technology Department of Engineering Sciences and Mathematics Division of Energy Engineering

Fig. 2.2 Examples of small electronic devices containing power electronics (plus an incandescent lamp). Note the difference in vertical scale between the different waveforms.

DOCTORAL THESIS 
On High-Frequency Distortion in Low-Voltage Power Systems -Anders Larsson- Luleå University of Technology Department of Engineering Sciences and Mathematics Division of Energy Engineering 

 Abstract 

Power quality is a subject that has received a lot of attention during the last 10 to 20 years, both in industry and in academia. Power quality concerns interaction between the power grid and its customers and between the power grid and equipment connected to it, reflected in voltages and currents. Research and other developments in this area have to a great extent concentrated on relatively slow and low-frequency phenomena, with the main emphasis being on voltage dips (reductions in voltage magnitude with duration between about 50 ms and several seconds) and low-frequency harmonics (waveform distortion by frequency components up to about 2 kHz). These phenomena are reasonably well understood and several standards cover the area. For higher-frequency phenomena, above 2 kHz, there is no such general understanding, nor is there anything close to a complete set of standards covering this area. Modern energy efficient equipment connected to the grid, like fluorescent lamps but also solar panels, often uses switching technology, with switching frequencies that can range from a couple of kHz up to several hundreds of kHz. The grid is also used for communication of e.g. meter readings, system controls etc. This so-called power-line communication is using the same frequency range. The main frequency range of interest for this thesis has been the range from 2 to 150 kHz. There are two completely different measurement methods covering this frequency range: time-domain based and frequency-domain based. Time domain based measurements are used throughout the thesis. This gives an opportunity to choose between different analysing tools where among others the joint time-frequency domain has shown to be a useful tool for describing waveform distortion in our frequency range of interest. The majority of the measurements presented in this thesis have been directed towards fluorescent light powered by high frequency ballasts. This type of load has been, due to stringent harmonic limits, one of the first to use a more advanced switching technology called active power factor correction. This technique is also getting more frequently used in other small-power equipment, like computers. Installations of lights in stores etc. normally contain a large number of ballast connected together and the interaction is of importance, for example for setting emission and immunity standards. The measurements on ballasts presented in this work have shown that distortion in the frequency rage 2-150 kHz comes in three types: narrowband distortion; wideband distortion; and recurrent oscillations. The recurrent oscillations are a new type of powerquality disturbance that had not been recognized as such before. The measurements further have shown that the three types of distortion spread in a completely different way from the individual devices to the grid. This knowledge is essential for the setting of emission requirements on energy-efficient equipment.
LINK ORIGINAL:http://pure.ltu.se/portal/files/32571608/Anders_Larsson.pdf

Emission and Interaction from Domestic Installations in the Low Voltage Electricity Network, up to 150 kHz - Sarah Rönnberg -Luleå University of Technology Department of Engineering Sciences and Mathematics Division of Energy Science

Emission and Interaction from Domestic Installations in the Low Voltage Electricity Network, up to 150 kHz - Sarah Rönnberg -Luleå University of Technology Department of Engineering Sciences and Mathematics Division of Energy Science. 

Abstract 
This thesis work has focused on conducted emission (up to 150 kHz) from common lowvoltage appliances. The emphasis has been on equipment that contributes to a sustainable energy system: photovoltaic (PV) installations and energy-saving lamps (LED lamps). The frequency components present in the grid in addition to the fundamental 50 Hz component can be divided into harmonics (up to 2 kHz in a 50 Hz system) and supraharmonics (2 kHz to 150 kHz). These frequency components are partly the effect of normal operation of equipment due to power-electronic converters and the switching technique used. Power line communication, PLC, is an important source of frequency components in the range 9 to 95 kHz. Even though from an equipment viewpoint there is no difference between a signal used for communication and a signal that is a residue from a switching circuit, PLC is a useful signal for operation of the grid and for communication with electricity meters. The amplitude of the communication signal is in in almost all cases higher than the emission from any other equipment connected to the grid. Understanding the different types of interaction between PLC and end-user equipment has been a major part of this work. Five types of interaction have been identified; some negative for PLC, some negative for end-user equipment. An important conclusion from this part of the work is that loss of communication with PLC, as is often reported with remote reading of electricity meters, is not due to emission by end-user equipment but due to the EMC filter of the end-user equipment providing a low-impedance path. The understandings acquired from the work with PLC have been applied to other types of emission as well. Supraharmonics from individual devices, above about 10 kHz, flow mainly to neighboring devices, not into the grid. This behavior was found by laboratory experiments and confirmed by other studies as well. A circuit-theory model has been developed that explains this behavior. The EMC filters are shown to be the main cause of this behavior. Other configurations of those filters may result in a larger flow of emission towards the grid. One type of appliance that has been introduced recently is the LED lamp. LED.
LINK ORIGINAL
https://pure.ltu.se/portal/files/64258823/Sarah_R_nnberg.pdf

From Organic to Bioorganic Devices Speaker: Prof Niyazi Serdar Sariciftci, Ordinarius Professor for Physical Chemistry, Johannes Kepler University Linz

Publicado em 3 de jul de 2016 Title : From Organic to Bioorganic Devices Date: 24 Jun 2016 Speaker: Prof Niyazi Serdar Sariciftci, Ordinarius Professor for Physical Chemistry, Johannes Kepler University Linz Please go to the IAS Channel for more videos: http://ias.ust.hk/webcast

The Launch of the Lomonosov Satellite - Prof George Smoot, Professor Emeritus of Physics, University of California at Berkeley; IAS Helmut & Anna Pao Sohmen Professor-at-Large, HKUST; Nobel Laureate in Physics

The Lomonosov Satellite was motivated by two convergent concepts: (1) a desire to rapidly follow up Gamma Ray Bursts (GRB), particularly short GRBs believed to be inspiraling binary Neutron Stars forming a black hole and relativisitic jets and (2) a desire by Lomonosov Moscow State University to have a major scientific effort to celebrate the 300th anniversary of Michael Lomonosov who convinced Empress Elizaveta Petrovna to create Moscow State University in 1755.

IAS / School of Science Joint Lecture : Prof George Smoot (24 May 2016)

Date: 24 May 2016 Speakers: Prof George Smoot, Professor Emeritus of Physics, University of California at Berkeley; IAS Helmut & Anna Pao Sohmen Professor-at-Large, HKUST; Nobel Laureate in Physics Please go to the IAS Channel for more videos: http://ias.ust.hk/webcast

PCIM 2016 – A quick overview of SEMIKRON’s product highlights

PCIM 2016 – SEMIKUBE 1.5kV 2-level inverter with intelligent switching

New Fuel Cells for Clean and Sustainable Energy Future Tim Zhao Chair Professor of Mechanical and Aerospace Engineering;

New Fuel Cells for Clean and Sustainable Energy Future Tim Zhao Chair Professor of Mechanical & Aerospace Engineering; Director of the HKUST Energy Institute

Reverse Engineering Nature's Robots Prof Tom Daniel - THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Publicado em 5 de jul de 2016 
IAS Distinguished Lecture Reverse Engineering Nature's Robots Prof Tom Daniel Komen Endowed Chair of Biology, University of Washington; Senior Visiting Fellow of HKUST Jockey Club Institute for Advanced Study 
 THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Simulation of a three-phase AC-DC boost converter using PSPICE

SIMULACIÓN CON CONDENSADORES DE BUS DC CARGADOS INICIALMENTE CADA UNO CON 400VDC,PARA EVITAR CORRIENTES DE PICO,LA ESTRATEGIA DE CONTROL CON 03 REDES SENSORAS DE CORRIENTE DE ENTRADA,Y SENSOR DEL BUS DC DE CONDENSADORES,ENTRADA  ESTRELLA TRIFASICA  CON 220VRMS.
SIMULACION CON PSPICE 8-DOWNLOAD SCHEMATIC FILE:
http://www.mediafire.com/download/imovic7p973megh/FA3f_VSI_2n_BOOST.sch

LIBRERIAS DE PSPICE Y MODELOS

EN ESTA ARTICULO DESCRIBIREMOS COMO ADICIONAR NUEVAS LIBRERIAS A SU VERSION PSPICE6 O PSPICE8 DE LA MICROSIM

EN PRIMER LUGAR DEBEMOS SABER QUE TODA NUEVA LIBRERIA ESTA FORMADA POR DOS ARCHIVOS PRINCIPALESPOR EJEMPLO:

BSC.slb =archivo pspice de simbolos

BCS.lib =archivo pspice de modelos


******* PASO 1 ******* Guarde o salve los dos archivos anteriores en el directorio C:\MSIMEV63\LIB

******* PASO 2 ******* IR AL MENU BARRA DE TAREAS Y ESCOGER Options - Editor Configuration - Library Settings ,LUEGO USE Browse para encontrar el archivo BSC.slb entonces clicar en el botom ADD* para adicionar a la lista de librerias.
DESPUES DE COMPLETAR CON SUCESO ESTA OPERACION USTED OBSERVARA EN LA PANTALLA DEL COMPUTADOR UNA FIGURA COMO ESTA:

******* PASO 3 ******* Debemos agregar el archivo bsc.lib a la biblioteca de modelos del Pspice,como archivo global
Next add bsc.lib to the models known to PSpice by pulling down the Analysis-Library and Include Files menu, and then use Browse to find the BSC.lib file and then ADD Library* to add it to the file list. After successfully completing this operation, your screen should look something like this:

You may have to restart the program to get PSpice to recognize your parts. The first time you simulate a circuit containing the new parts, you may get a warning message. This message can be ignored. OK.

SIMULACIÓN DE CIRCUITOS ELECTRÓNICOS DE POTENCIA CON PSPICE - FIGUERES AMOROS- BENAVENTE GARCIA

LINK
http://www.mediafire.com/download/ddqnaebnw13i42u/simulacion_de_circuitos_electronicos_de_potencia_con_pspice%282%29.pdf

Barton Zwiebach, Glimpses of Double Field Theory Geometry (Strings 2012)

Barton Zwiebach (born October 4, 1954) is a string theorist and professor at the Massachusetts Institute of Technology, born in Lima, Perú. His undergraduate work was in Electrical Engineering at the Universidad Nacional de Ingeniería in Peru, from which he graduated in 1977. His graduate work was in physics at the California Institute of Technology. Zwiebach is an MIT professor of physics, and one of the world leaders in string theory (his textbook on the subject is excellent, by the way, and I recommend it highly). The Strings conference is the largest annual meeting of string theorists, and includes the biggest names in the subject giving talks on advancements made in essentially every aspect of the theory. Anyone who is interested in the subject should be quite interested in these talks! (I'm hoping to actually attend the conference this year in Seoul... but we'll see...) The lectures can be found, viewed, and downloaded from free from the website for the Ludwig-Maximilians-Universität München, which was the venue for the conference in 2012). In particular, there are many more lectures which do not appear in this playlist (these are merely the lectures I personally find most interesting). Their website can be found here:

CIRCUITOS ELÉCTRICOS 1 Ing. Fernando. López. A -Ing. Oscar Morales G. TEORÍA Y PROBLEMAS-LIMA-PERÚ

HOJE 03 DE JULHO DE 2016 SURFANDO NA WEB ENCONTREI UM EXCELENTE LIVRO DE MEUS COLEGAS ENGENHEIROS ELETRÔNICOS PERUANOS FORMADOS NA UNIVERSIDADE NACIONAL DE ENGENHARIA -LIMA PERÚ.
TITULO DEL LIVRO: CIRCUITOS ELÉCTRICOS 1 
AUTORES:
ING. FERNANDO LOPEZ ARAMBURU
ING. 0SCAR. MORALES.G.
 HOJE FALE PELO TELEFONE COM MEU AMIGO ENG.FERNANDO LOPEZ DE LIMA PERÚ PARA PUBLICAR SUA OBRA PARA TODO BRASIL E O MUNDO,DEU OK,DEVO ACLARAR QUE SOMENTE TENHO UMA PARTE DO LIVRO OS CAPITULOS ULTIMOS 7,8,9, E 10 FALTAM,MAIS DE TODAS MANEIRAS PENSO QUE VAI SER DE GRANDE UTILIDADE A OS ESTUDANTES.

LINK LIVRO COMPRIMIDO ARQUIVO WINRAR:
http://www.mediafire.com/download/dwz2x1l3sbns571/CIRCUITOS-I.rar

 BREVE RESENHA DOS AUTORES
  Ing. Fernando Lopez Aramburu

GERENTE TECNICO
GUARD SAC
January 2010 – Present (6 years 7 months)
DISEÑO DE REDES DE SUPERVISION DE CAMARAS REMOTAS EN EDIFICIOS / RESIDENCIAS

Education

UNIVERSIDAD NACIONAL DEL CALLAO
DOCTORADO INGENIERIA ELECTRICA, CANDIDATO TESIS DOCTORAL
2012 – 2014
UNIVERSIDAD NACIONAL DEL CALLAO
Magister, Ciencias ingenieria mencion Telecomunicaciones
2009 – 2010
.-adquisicion de equipos ultima generacion RF
- " modulos seguridad electronica
Activities and Societies: -investigacion Radio frequencia -diseño wi-fi -consultor Telecomunicaciones
Universidad Nacional de Ingeniería
Universidad Nacional de Ingeniería
INGENIERO ELECTRONICO, ELECTRONICA, TELECOMUNICACIONES
1975 – 1980
GERENTE TECNICO SEGURIDAD ELECTRONICA
AUTOR TEXTOS A NIVEL NACIONAL
Activities and Societies: PROFESOR PRINCIPAL UNI CONSULTOR PROYECTOS INGENIERIA ASESOR E INVESTIGADOR


ING. MORALES GONZAGA OSCAR ANDRES

Ingeniero Electrónico UNI - UPRP - UNAC - UPAO - EITEPOL - EOFAP - CIBERTEC Circuitos Eléctricos I (DC) - Circuitos Eléctricos II (AC) Teoría de Redes - Análisis y Síntesis de Redes Dispositivos Electrónicos Circuitos Electrónicos Analógicos y Digitales Electrónica de Potencia Seminario de Tesis - Metodología de la Investigación Comercio Electrónico - Estructuración Curricular Maestría en Sistemas de Información Diplomado en Estructura Curricular, E-Commerce, Didáctica Universitaria - Investigación Universitaria

http://directorio.concytec.gob.pe/appDirectorioCTI/VerDatosInvestigador.do?id_investigador=10856

Conferencia "Mecánica Cuántica, todavía sorprende" del Ph.D. Barton Zwiebach - UNIVERSIDAD NACIONAL DE INGENIERIA-LIMA -PERÚ.

Conferencia "Mecánica Cuántica, todavía sorprende" del Ph.D. Barton Zwiebach - UNIVERSIDAD NACIONAL DE INGENIERIA-LIMA -PERÚ. PROGRAMA ENCUENTRO CON LA CIENCIA-DR. MODESTO MONTOYA-LIMA-PERÚ. 
 Barton Zwiebach (born October 4, 1954) is a string theorist and professor at the Massachusetts Institute of Technology, born in Lima, Perú. His undergraduate work was in Electrical Engineering at the Universidad Nacional de Ingeniería in Peru, from which he graduated in 1977. 
 His graduate work was in physics at the California Institute of Technology. Zwiebach obtained his Ph.D. in 1983, working under the supervision of Murray Gell-Mann. He has held postdoctoral positions at the University of California, Berkeley, and at MIT, where he became an assistant professor of physics in 1987, and a permanent member of the faculty in 1994. He is one of the world's leading experts in string field theory. He wrote the textbook, "A First Course in String Theory" (2004, ISBN 0-521-83143-1), meant for undergraduates.
LINK: http://www.encuentrocientificointernacional.org
LINK: http://www.cienciaperu.org

Configurações e modos de operação dos inversores híbridos e seus requisitos técnicos para operação on-grid e off-grid Prof. Me. Lucas Vizzotto Bellinaso – Prof. Dr. Leandro Michels -Workshop inversores híbridos com armazenamento de energia

LINK
http://www.iee.usp.br/sites/default/files/%20Apresenta%C3%A7%C3%A3o_Lucas.pdf

Nanotecnologia: Cenário Atual, Inovação e Marco Regulatório - Parte I - Strategic Workshops da UNIVERSIDADE DE SÃO PAULO-BRASIL

A série de eventos Strategic Workshops da USP busca articular os pesquisadores em torno de temas transdisciplinares, que contemplem a USP como um todo. O objetivo tem sido organizar a pesquisa na USP priorizando temas em que temos excelência ou que tenham grande potencial, mas que precisem de melhor articulação. A intensa pesquisa utilizando a plataforma nanotecnológica está intimamente relacionada ao desenvolvimento econômico e social do país. Publicado em 16/05/2016 Formatos: FLV (640 X 360 px), MP4 (640 X 480 px) Responsáveis: Sergio Ricardo Villani Bernardo Produção: IEA - Instituto de Estudos Avançados Palestrantes: Henrique Toma, Guilherme Ary Plonski, Adalberto Fazzio, Eron Bezerra, José E. Krieger, Marcos Buckeridge, José E. Krieger, Flávio Plentz

LINK ORIGINAL
http://www.iptv.usp.br/portal/video.action?idItem=33075

Desafios para uma Amazônia Sustentável - A Amazônia como Território para Expansão da Hidroeletricidade?

A Bacia Amazônica é a principal reserva de água doce do mundo. Com 60% de sua totalidade em território brasileiro, seu papel para o país é significativo, o que gera debates acerca de qual seria o melhor uso de tamanho potencial. Possuindo caráter estratégico para o desenvolvimento brasileiro, a opção pela implantação de usinas hidrelétricas ao longo de seus rios busca solucionar a necessidade do país por energia elétrica. Para tanto, diversas usinar foram construídas ou são planejadas para a Amazônia, como as usinas de Santo Antônio e Jirau, em Rondônia, e de Belo Monte e São Luís do Tapajós, no Pará.
 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
http://farol.ufsm.br/videos/ver/TEKUMX/

 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
 LINK ORIGINAL:http://coral.ufsm.br/gepocufsm/index.php/noticias/183-pae-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

RESUMO 
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.
LINK
http://www.gqee.unifei.edu.br/arquivos_upload/mesdou/81/81.pdf

Mentira con lampara led china, LED lamp SCAM

 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.

FONTE ORIGINAL:
http://oglobo.globo.com/economia/defesa-do-consumidor/inmetro-lanca-guia-sobre-uso-das-lampadas-led-18898848

Cost-Effective APF/UPS System with Seamless Mode Transfer Woo-Cheol Lee -

Cost-Effective APF/UPS System with Seamless Mode Transfer Woo-Cheol Lee

 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.

LINK 
http://www.jeet.or.kr/ltkPSWeb/pub/pubfpfile.aspx?ppseq=1152

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

JEET, Vol. 11, No. 3, May 2016
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
LINK ORIGINAL
http://www.jeet.or.kr/ltkPSWeb/pub/pubfpfile.aspx?ppseq=1491