Novel Hybrid Unidirectional Three-Phase AC-DC Converter Systems by KAZUAKI MINO-Swiss Federal Institute of Technology (ETH) Zurich

Novel Hybrid Unidirectional Three-Phase AC-DC Converter Systems by KAZUAKI MINO A dissertation submitted to Swiss Federal Institute of Technology (ETH) Zurich EIDGENÖSSISCHE TECHNISCHE HOCHSCHULE ZÜRICH for the degree of Doctor of Sciences Presented by Kazuaki Mino E.E., M.Sc., Tokyo Denki University born December 23, 1968 citizen of Japan Accepted Accepted on the recommendation of Prof. Dr. J. W. Kolar, Examiner Prof. H. Akagi, Co-Examiner

Abstract

In order to reduce harmonics, many rectifier topologies have been developing. Passive rectifiers, which employ only passive components, e.g. phase shifting transformers, diode bridges, and inductors etc., show some advantages concerning high efficiency, low EMC, low complexity, and high reliability. The passive components could be compact if mains frequency is high as in aircraft and micro gas turbine applications. However, the output voltage is unregulated. Furthermore, the input current of the passive rectifiers results in a staircase waveform which is not high quality if compared to active rectifiers. In this thesis, the drawbacks of the passive rectifiers are reduced. A diode bridge rectifier whose harmonics are reduced by adding an inductor to a diode bridge is widely used in motor drive applications. Mains current quality of the diode bridge rectifier is improved if a large inductance of the passive inductor is employed. However, the inductor is bulky, heavy and occupies a large space. In this thesis, the power density of the diode bridge rectifier is improved. The Electronic Smoothing Inductor, which is able to control a current to a constant value, is applied to the diode bridge output to act as a passive inductor. A control scheme for the DC-link voltage and active damping control for filter resonances are proposed. Moreover, the filtering concept is established to effectively attenuate EMI emission. The system dimensioning of the rectifier system is also introduced. A 5kW prototype shows a significant improvement in power density. The behaviours of the proposed rectifier system are tested by assuming practical conditions, e.g. not only ideal but also unbalanced and distorted input conditions. The dynamic behaviours are also evaluated. From the results, it is verified that the Electronic Smoothing Inductor has a similar characteristic to a passive inductor having a large inductance. Therefore, the proposed rectifier system brings a significant improvement in power density without impairing any features of a diode bridge rectifier. On the other hand, the passive 12-pulse rectifier can be extended to a hybrid rectifier having two active switches operated in an interleaved manner. The proposed topology ensures a controlled output voltage. Furthermore, modulation schemes to realize a purely sinusoidal input current are proposed. A 10kW prototype has been build with respect to future more-electric aircraft applications. The design procedure including the magnetic components and the active parts is introduced in this thesis. The proposed hybrid rectifier and the control schemes are verified by numerical simulations and experimental results. The output voltage is regulated. Furthermore, the input current is improved from a 12-pulse staircase shape to sinusoidal by the proposed triangular modulation. Moreover, the proposed closed loop control of input currents is performed to track a reference independently of mains voltages e.g. unbalanced and distorted input voltages. Therefore, both output voltage regulation and improvement of input current quality for the 12-pulse rectifier have been achieved by the proposed schemes. This thesis presents two rectifier systems which perform successfully. Both systems are hybrid and allow output power to flow without switching behaviours. Therefore, the proposed rectifier systems have not only high quality characteristics but also a high reliability. The system configurations, control schemes and their features are introduced. 

LINK http://www.mediafire.com/file/0tokqbgz47ukn4e/eth-144-02.pdf/file

Hybrid DC/DC Converter for Electric Vehicle (EV) On-Board Charger (OBC) Using Full-Bridge (FB) and Resonant Converter with Single Transformer Najam ul hassan Department of Electrical Engineering Graduate School, Myongji University

Hybrid DC/DC Converter for Electric Vehicle (EV) On-Board Charger (OBC) Using Full-Bridge (FB) and Resonant Converter with Single Transformer Najam ul hassan Department of Electrical Engineering Graduate School, Myongji University Advisor Professor Lee Jun-young

ABSTRACT

In this document a highly efficient hybrid DC/DC converter is proposed. Its design procedure, analysis and experimental results are presented by testing of the implemented prototype and. whole document is arranged into six chapters. Electrical vehicle battery chargers background, power level, different charging methods and purpose of the document is presented in chapter 1. High power DC/DC converter topologies suggested recently, and its benefits and drawbacks are briefly discussed in chapter 2. Proposed converter diagram, operational analysis and comparison of proposed converter with other DC/DC converter topologies are presented in chapter 3. Chapter 4 is about design procedure. Based on the design procedure suggested in chapter 4, prototype design and simulation results are given in chapter 5 and experimental results are given in chapter 6. Most of the previously proposed hybrid converters have used two transformers for each converter in hybrid structure that makes the size of the converter bulky and there was also low utilization and the power distribution problem between two transformers of the hybrid converters. To solve this problem, a new high efficient hybrid DC/DC converters using single transformer, which has characteristics of Full-bridge and resonant convertor for EV OBC, is proposed in this vii thesis. By using single transformer the power distribution problem has been solved and transformer utilization has become high. In the proposed converter, magnetizing inductance has been used at the primary side of the transformer to obtain the soft switching such as zero voltage switching (ZVS). Leakage inductance of the transformer has been used as resonant inductor on the secondary side to avoid the use of separate inductor as resonant. The prototype of 6.6KW has been implemented to verify the feasibility of the proposed converter and maximum efficiency of 97.4 is achieved at 413 V.

LINK http://www.mediafire.com/file/fd3hegpispv96nv/Hybrid_DCDC_CONVERTER_EV_CHARGER.pdf/file

UPS Topologies for the Elimination of Inrush Current Phenomenon Associated with Transformer-Coupled Loads-Syed Sabir Hussain Bukhari Graduate School of Hanyang University

UPS Topologies for the Elimination of Inrush Current Phenomenon Associated with Transformer-Coupled Loads Syed Sabir Hussain Bukhari Department of Electronic System Engineering The Graduate School Hanyang University 

ABSTRACT
 Many critical load applications depend upon UPS system to uphold power in the course of outages as well as during under- and over-voltage grid conditions. Once any disruption occurs at the grid, a UPS system either takes over the load completely or injects the compensation voltage to the load to avoid interruption. For an off-line and line-interactive UPS systems, this transfer of load takes a minimum of 1–5 msec and can be as much as 20 msec, mainly depending upon the time required for the fault detection and the operating mechanisms of the transfer switches. Throughout this time duration, the load transformer, accompanied by the sensitive load is probable to be exposed to the distorted grid voltage. As a result, a flux-offset of the load transformer is established. Thus, as soon as the UPS system takes over the load and reinstates its voltage, the transformer flux might increase above its saturation level and generates substantial inrush current. In the case of an on-line UPS topology, the load transfer time period is zero. The phenomenon of inrush current for an on-line UPS system is observed when it powers multiple transformer-coupled loads. Under such a condition, the switching-in of a load when other loads are already on-line can cause a large magnitude of inrush current because of the energizing of the load transformer. This inrush current can take several cycles, which reduces the line voltages and triggers over-current protecting devices of the UPS systems. In this research, an off-line UPS system based on current regulated voltage source inverter (CRVSI) instead of conventional voltage source inverter is proposed. The inverter of the UPS system utilizes a current control algorithm implemented in the stationary frame. This enables an off-line UPS system to eliminate the inrush current during the transition while powering a transformer-coupled load. To eliminate the inrush current phenomenon related with a line-interactive UPS system and to achieve fast current injection by the inverter during any abnormal grid power condition, a new line-interactive UPS system is proposed in this research that uses a standard current regulated inverter coupled with the secondary of the load transformer. The possibility of inrush current is eliminated with an instantaneous compensation of load current and a seamless transition of a load. This research also proposes an on-line UPS topology with eliminated inrush current while operating with multiple transformer-coupled loads, achieved through a swift performing current regulated inverter operating with a control scheme consists of two control loops to supply the additional current caused by the switching-in of the loads. The outer voltage control loop controls the load voltage. However, the inner current loop controls the load current to vary it sinusoidally as per the supplementary load demand during the engagement of other load transformers, leaving behind any possibility of inrush current generation. All of the above mentioned UPS topologies are well-analyzed and implemented through simulation and experimental results. A comparison between the conventional static UPS topologies and the proposed UPS topologies is also provided in this research.

ORIGINAL LINK:http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=e0fe01fc0fc571f5ffe0bdc3ef48d419

LINK http://www.mediafire.com/file/yute4gnsxo2es6n/UPS_Topologies_for_the_Elimination_of_Inrush_Current.pdf/file

A Study on The Control Technique for Modular Three-Phase Uninterruptible Power Supply(UPS) With Boost Converter Jin, Seongmin Dept. of Electrical Engineering Incheon National University-SOUTH KOREA

A Study on The Control Technique for Modular Three-Phase Uninterruptible Power Supply(UPS) With Boost Converter Jin, Seongmin Dept. of Electrical Engineering Incheon National University

ABSTRACT
 This study proposes a control algorithm design and implementation method for the control method of the modular three phase uninterruptible power supply (UPS) with boost function. With the development of the industrial age, there has been an increase in the load required to maintain the constant power source, which has increased the demand for the uninterruptible power supply. In addition, a parallel type uninterruptible power supply unit of a modular type is widely used to satisfy a load of a high capacity It is difficult to apply a desired output voltage to a load by using a 250V DC voltage as the input power source of a UPS used in a power plant system. Therefore, it is necessary to design a module suitable for UPS system for power plant. A UPS for applying 3-phase AC voltage to a load is generally composed of a 3-phase inverter and an output L-C filter. In order to apply this to the power plant system, it is necessary to construct and control a power converter for a single module that boosts the input voltage by applying a boost converter to the input of the inverter to supply the constant voltage to the inverter. In addition, a parallel operation control technique is necessary to solve the problem of connecting such a single module in parallel. Therefore, in this study, the study on the configuration, design and parallel operation control technique for single module UPS for power plant was conducted. The proposed algorithm proved its superior performance and feasibility through simulation and experimental results Key words: Uninterruptible power supply, single module power converter for plant, parallel operation control

LINK A:http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=720abcc1b0b8a4c6ffe0bdc3ef48d419

LINK B :http://www.mediafire.com/file/zgqcnslz3p72edt/A_Study_on_The_Control_Technique_for_Modular_UPS.pdf/file

RESOLVIENDO EJERCICIOS DE CIRCUITOS ELÉCTRICOS 1-PROF.DR. ENG. FERNANDO LOPEZ ARAMBURU-LIMA-PERU

ES PARA MI UNA GRANDE SATISFACCION DIFUNDIR EN MI BLOG LOS VIDEOS DE MI ESTIMADO COLEGA DR. ING. FERNANDO LOPEZ ARAMBURU QUE EN MEDIO A LA PANDEMIA DEL CORONA VIRUS SE HA REINVENTADO DICTANDO SUS CLASES DE MANERA VIRTUAL PARA LA UNIVERSIDAD NACIONAL DE INGENIERIA FACULTAD DE ING. ELECTRICA Y ELECTRONICA,EL ES UN DOCENTE CON MAS 30 AÑOS DE EXPERIENCIA HA TRABAJADO EN LA EMPRESA PRIVADA Y HA SIDO PROFESOR DE CIRCUITOS ELECTRICOS EN MUCHAS UNIVERSIDADES ESTATALES Y PRIVADAS DEL PERU,ES CONOCIDO EN LA COMUNIDAD ACADEMICO COMO 'CHAMPION" INGENIERO,DOTADO DE UN CARISMA UNICO DICTA SUS CLASES CON MUCHA DIDACTICA Y ANALISIS CRITICO,LE ENVIO UN CORDIAL SALUDO.

REDES SIMETRICAS-CIRCUITOS ELÉCTRICOS 1-ENG. FERNANDO LOPEZ ARAMBURU-FACULTAD INGENIERIA ELECTRICA ELECTRONICA-UNIVERSIDAD NACIONAL DE INGENIERIA- LIMA PERU

MÉTODO DE MALLAS | CIRCUITOS ELÉCTRICOS 1-ENG. FERNANDO LOPEZ ARAMBURU-FACULTAD INGENIERIA ELECTRICA ELECTRONICA-UNI- LIMA PERU

CHAMPION INGENIERIA Hola Champions🙌🏽 en este video🎥 resolveremos👨🏻‍🏫 2 ejercicios aplicando el método de 🔋MALLAS🔌 💡.

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TEOREMA DE THEVENIN | CIRCUITOS ELÉCTRICOS 1-ENG. FERNANDO LOPEZ ARAMBURU-FACULTAD INGENIERIA ELECTRICA ELECTRONICA-UNI- LIMA PERU

BUENAS TARDES A TODA COMUNIDAD ACADEMICA COMPARTO CON TODOS UN VIDEO DE MI ESTIMADO AMIGO EL EXCELENTE PROFESOR ING. FERNANDO LOPEZ ARAMBURU MAS CONOCIDO COMO "CHAMPION" SOBRE EL FAMOSO TEOREMA DE THEVENIN,ACTUALMENTE EL TIENE SU CANAL EN EL YOUTUBE,ES IMPORTANTE RESALTAR SU METODO DIDACTICO DE TRANSMITIR SUS CONOCIMIENTOS,EL ES DOCENTE DE LA FACULTAD DE INGENIERIA ELECTRICA ELECTRONICA DE LA UNIVERSIDAD NACIONAL DE INGENIERIA LIMA PERU,MAS INFORMACIONES:

 CHAMPION INGENIERIA Hola Champions🙌🏽 BIENVENIDOS A LA MARATÓN DE CIRCUITOS ELÉCTRICOS 1 En este video🎥 resolveremos👨🏻‍🏫 1 ejercicios aplicando🔋TEOREMA DE THEVENIN🔌 Este mismo circuito también lo resolveremos con el Teorema de Norton en el siguiente video💡

 📽Suscríbanse a mi canal📲 y activen las notificaciones😉
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PROBLEMAS DE ANALISIS DE CIRCUITOS I-C-PROF.FERNANDO LOPEZ ARAMBURU-FACULTAD DDE INGENIERIA ELECTRICA ELECTRONICA UNI PERU 1984

PROBLEMAS DE ANALISIS DE CIRCUITOS I-C-PROF.FERNANDO LOPEZ ARAMBURU-FACULTAD DDE INGENIERIA ELECTRICA ELECTRONICA UNI PERU 1984
 Colaboração ING. Ivan Eduardo Castillo Castilla‎ del grupo facebook LIBROS, BOLETINES Y SEPARATAS DE ANTAÑO

EXAMEN PARCIAL DE ANALISIS DE CIRCUITOS ELECTRICOS I - FACULTAD DE INGENIERIA ELECTRICA Y ELECTRONICA-UNIVERSIDAD NACIONAL DE INGENIERIA-LIMA PERU-1985

PROFESORES TOKUMORI Y YAURI...
PUBLICOU UMA COLABORAÇÃO DO ENGENHEIRO PERUANO Ivan Eduardo Castillo Castilla DO GRUPO DE FACEBOOK LIBROS BOLETINES Y SEPARATAS DE ANTAÑO DE MEU CARO COLEGA ENG. ALDO JUAN GIL CRISOSTOMO.

PROJETO INVERSOL – DESENVOLVIMENTO DE UMA FONTE ININTERRUPTA DE ENERGIA COM POSSIBILIDADE DE USO EM SISTEMA FOTOVOLTAICO-Lucas Maciel Menezes-UNIVERSIDADE FEDERAL DO CEARÁ CENTRO DE TECNOLOGIA PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA

RESUMO
 Resumo da dissertação apresentada à Universidade Federal do Ceará como parte dos requisitos para obtenção do grau de Mestre em Engenharia Elétrica.
PROJETO INVERSOL – DESENVOLVIMENTO DE UMA FONTE ININTERRUPTA DE ENERGIA COM POSSIBILIDADE DE USO EM SISTEMA FOTOVOLTAICO LUCAS MACIEL MENEZES

O estudo para o desenvolvimento de uma fonte ininterrupta de energia com possibilidade de uso em sistema fotovoltaico, tem como motivação que a larga escala da produção desse tipo de equipamento possa reduzir o custo dos conversores de eletrônica de potência associados a uma instalação fotovoltaica. O projeto proporem a união de topologias de conversores, resultando em uma UPS do tipo on-line com tensão de entrada e de saída de 220 Volts 60 Hz, potência total de 715VA, rendimento de 88%, isolada em alta freqüência e com correção do fator de potência na entrada. Sendo composta por um retificador na entrada com topologia de um conversor em ponte completa alimentado em corrente, esse conversor é responsável por prover a correção do fator de potência na entrada e da isolação galvânica em alta freqüência. Um inversor em ponte completa com filtro LC e modulação PWM unipolar, que é capaz de entregar uma tensão senoidal para a carga e um conversor boost de alto ganho que cumpre o papel de elevar a tensão de 24 Volts do banco de baterias para a tensão de 400 Volts do barramento de entrada do inversor. Cada conversor tem seu estudo teórico desenvolvido e ao final após as especificações e dimensionamentos são mostrados os resultados experimentais do protótipo do projeto. Quando o sistema for aproveitado em uma instalação fotovoltaica somente o inversor e o conversor boost de alto ganho são utilizados. Número de paginas: 216.
Palavras-Chave: Eletrônica de Potência, fonte ininterrupta de energia, correção de fator de potência, isolação em alta freqüência, inversor, sistema fotovoltaico.

LINK http://www.mediafire.com/file/ssddl7y4kaxvbzn/LUCASMACIEL.pdf/file

Design of Advanced Voltage Controller for Three-Phase UPS inverters by KYUNG-HWAN KIM-Dept. of Electrical Engineering The Graduate School of Hanyang University

Design of Advanced Voltage Controller for Three-Phase UPS inverters by KYUNG-HWAN KIM Under the supervision of Prof. DONG-SEOK HYUN, Ph.D. Dept. of Electrical Engineering The Graduate School of Hanyang University .
ABSTRACT
 Inverter system, which uses LC component as the output filter, is essential for a UPS (Uninterruptible Power supply), UPQC (Universal Custom Power Conditioner) and PCS (Power Conditioning System) for the photovoltaic power system. This paper presents DSP (Digital Signal Processor) controlled voltage controller for a 3-phase UPS inverter, which is able to compensate the voltage distortions due to unbalanced and nonlinear loads. The paper discussed the problem of conventional control schemes for the compensation of voltage distortion when they are applied to UPS inverter, and proposes advanced synchronous reference frame control scheme which is able to overcome the problem. In order to solve the problem of low damping ratio of LC filter, the inverter current feed-forward compensator including the selection of the feed-forward gain is proposed. And the digital filter for a compensation of the voltage distortion due to unbalanced and nonlinear loads is also proposed, which makes PI controllers in the synchronous reference frame are able to operate with DC values even under nonlinear and unbalanced load, likewise ensures PI controllers are able to provide zero steady state error. In order to improve the practical usability of the proposed scheme in the paper, the realization of the PLL and the parallel operation, which are essential for UPS, using the proposed controller is also presented. Especially, this paper shows that the feed-forward compensation of the inverter current and the PWM synchronization method proposed in the paper ensures a high precise load-sharing performance in parallel operation of inverter system. The effectiveness of the proposed scheme has been investigated and verified in digital simulation. This thesis also investigates the digital implementation of the proposed systems and all of the related theoretical concepts and control systems have been verified in experimental prototype of the UPS systems.
LINK   http://www.mediafire.com/file/unohepagjsqiw6g/DSPTRIFASICO.pdf/file

INVERSOR MONOFÁSICO ISOLADO EM ALTA FREQÜÊNCIA COM AMPLA FAIXA DE TENSÃO DE ENTRADA-Carlos Elmano de Alencar e Silva-Programa de Pós-Graduação em Engenharia Elétrica da Universidade Federal do Ceará-BRASIL

INVERSOR MONOFÁSICO ISOLADO EM ALTA FREQÜÊNCIA COM AMPLA FAIXA DE TENSÃO DE ENTRADA

 Dissertação submetida à Universidade Federal do Ceará como parte dos requisitos para obtenção do grau de Mestre em Engenharia Elétrica Silva, C. E. A.
“INVERSOR MONOFÁSICO ISOLADO EM ALTA FREQÜÊNCIA COM AMPLA FAIXA DE TENSÃO DE ENTRADA”, Universidade Federal do Ceará – UFC, 2007, 154p.

 Essa dissertação apresenta a análise, o projeto, a simulação e os resultados experimentais de um inversor monofásico, isolado em alta freqüência, capaz de operar com ampla faixa de tensão de entrada. Dessa forma, esse conversor se encaixa em aplicações com fontes alternativas de energia e em aplicações com baterias. A topologia desenvolvida consiste em uma estrutura de dois estágios de processamento de potência. O primeiro estágio é implementado por um conversor push-pull responsável pela isolação elétrica em alta freqüência e pela elevação da tensão de entrada, fornecendo em sua saída uma tensão contínua e regulada de 420V. O segundo estágio de processamento de potência é implementado por um inversor ponte completa reponsável pela modulação senoidal da tensão de saída. É apresentada a análise de cada um dos estágios de processamento de potência, em seguida, o projeto completo do circuito de potência é feito para um protótipo de 400VA, com tensão de saída de 220V eficaz, freqüência de saída de 400Hz, e tensão de entrada entre 60V e 90V. É feita a compensação em freqüência de cada um dos estágios de processamento de potência, garantindo a estabilidade de operação, a regulação da tensão de saída mediante variações de carga e redução da ondulação de 800Hz introduzida na corrente pelo inversor ponte completa. O projeto completo dos compensadores e a estrutura dos circuitos de controle são apresentados. São mostrados os resultados de simulação do conversor projetado para diversas cargas e condições extremas de operação, os quais dão suporte à montagem do protótipo. Finalmente são apresentados os principais resultados experimentais do protótipo montado em laboratório.
 Palavras-chave: Conversão CC-CA, Isolação em alta freqüência, Tensão de entrada variável, Alta taxa de elevação.
LINK
http://www.mediafire.com/file/frx3s1figluxuc5/CARLOSELMANO.pdf/file

Etude, conception et réalisation de circuits de commande d'IGBT de forte puissance par Pierre École doctorale Électronique, électrotechnique, automatique (Lyon)

Etude, conception et réalisation de circuits de commande d'IGBT de forte puissance par Pierre Lefranc

Soutenue en 2005 à Lyon, INSA , dans le cadre de École doctorale Électronique, électrotechnique, automatique (Lyon) , en partenariat avec CEGELY - Centre de génie électrique de Lyon (Rhône) (laboratoire) . 
 Résumé
 L'IGBT (Insulated Gate Bipolar Transistor) a pris une part importante dans les applications de l'électronique de puissance. Depuis ses débuts dans les années 1980, il n'a cessé de concurrencer les composants comme le thyristor, le GTO, le MOSFET et le transistor bipolaire. A l'heure actuelle, le transistor IGBT permet d'être utilisé dans beaucoup d'applications notamment sous forme de module IGBT dont il est question dans cette thèse. Les modules IGBT font partie intégrante des convertisseurs de puissance. Ils sont associés à leurs circuits de commande (aussi appelés drivers). Ils ont pour fonction de piloter les modules IGBT qui leurs sont associés et de garantir leur intégrité en cas de défauts (surintensité, surtension). Dans ce mémoire, nous traitons de la réalisation et la conception de drivers de modules IGBT. Pour mener à bien cette étude, nous présentons tout d'abord un état de l'art sur les modules IGBT et leurs drivers. Ensuite, nous proposons une analyse et une modélisation des modules IGBT en prenant en compte le câblage. Nous apportons un complément d'étude sur le phénomène d'avalanche dynamique des puces IGBT en régime de surintensité. Enfin, nous effectuons la conception et la réalisation de drivers de modules IGBT. La fonction principale des drivers est découpée en sous fonctions qui permettent d'effectuer une étude structurée. Chaque sous fonction est étudiée et les solutions apportées sont exposées avec simulations et résultats expérimentaux à l'appui.
LINK:
http://www.mediafire.com/file/homyek8b2tdproq/thesefrance.pdf/file

METODOLOGIA DE PROJETO DE INVERSORES MONOFÁSICOS DE TENSÃO PARA CARGAS NÃO-LINEARES AUTOR FERNANDO HAEMING GERENT UNIVERSIDADE FEDERAL DE SANTA CATARINA PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA-BRASIL

METODOLOGIA DE PROJETO DE INVERSORES MONOFÁSICOS DE TENSÃO PARA CARGAS NÃO-LINEARES FERNANDO AUTOR:HAEMING GERENT UNIVERSIDADE FEDERAL DE SANTA CATARINA PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA-BRASIL 

 Resumo da Dissertação apresentada à UFSC como parte dos requisitos necessários para a obtenção do grau de Mestre em Engenharia Elétrica.

METODOLOGIA DE PROJETO DE INVERSORES MONOFÁSICOS DE TENSÃO PARA CARGAS NÃO-LINEARES
Fernando Haeming Gerent Junho / 2005

 Orientador: Prof. Ivo Barbi, Dr. Ing. Área de Concentração: Eletrônica de Potência e Acionamento Elétrico. Palavras-chave: Inversor; carga não-linear, metodologia de projeto. Número de páginas: 165.
Este trabalho tem por objetivo apresentar uma metodologia de projeto para inversores senoidais monofásicos de tensão com baixa THD que alimentam cargas nãolineares do tipo retificador monofásico com filtro capacitivo. Entre os principais atrativos deste trabalho está a interação entre os parâmetros do filtro e do transformador de forma que a relação de transformação ótima para o circuito possa ser determinada. Além disso, a falta de material relacionada ao projeto de inversores para cargas não-lineares também motivou o trabalho. Outros aspectos de interesse abrangem o estudo detalhado do retificador monofásico com filtro capacitivo e o controle da corrente magnetizante do transformador em razão da possibilidade de saturação do núcleo.
LINK:http://www.mediafire.com/file/1uiggdssti8k1w1/METODOLOGIA_DE_PROJETO_DE_INVERSORES.pdf/file

Interlinking Converter Control Techniques to Improve Power Quality in Hybrid AC-DC Microgrids 교류-직류 마이크로그리드 인터링킹 컨버터의 고품질 전력제어기술-AUTHOR PHAN DANG MINH UNIVERSITY OF ULSAN-SOUTH KOREA

UNIVERSITY OF ULSAN-SOUTH KOREA
 Interlinking Converter Control Techniques to Improve Power Quality in Hybrid AC-DC Microgrids by Phan Dang Minh

A Dissertation Submitted to the Graduate School of University of Ulsan in partial fulfillment of the requirements for the degree of Doctor of Philosophy in The Graduate School of University of Ulsan Department of Electrical Engineering.
December 2019

 Abstract 
Hybrid AC-DC microgrids (HMGs) have been studied recently in order to simultaneously exploit AC and DC microgrids (MGs). This dissertation develops control techniques for interlinking converter (IC) which is utilized to link MGs in HMGs. With the proposed control techniques, IC simultaneously manages various AC and DC voltage quality issues along with power flow among MGs. In islanded HMGs, where utility grid is not considered, power quality is seriously degraded with highly distorted bus voltage when nonlinear loads are applied. In order to obtain sinusoidal bus voltage, we propose an IC control scheme which maintains bus voltage by providing harmonic currents caused by the nonlinear load. Moreover, the active power between DC and AC distributed generations (DGs) is also accurately balanced by IC. In the proposed algorithm, the desired IC current is determined by only considering the IC terminal voltage instead of the load current. Consequently, power converters in HMGs are operated autonomously with low system cost because communication links among them are not needed. When AC MG connects to the utility grid, HMGs become grid-connected HMGs. In grid-connected HMGs, we have considered different conditions such as: the abnormal grid voltage, the utilized nonlinear load and the wide variation of DC load power. A versatile IC control strategy is proposed in order to enhance HMGs power quality under such severe conditions. Without implementing any additional hardware compensator, IC with the proposed control scheme can mitigate various issues such as distortion, sag/swell and imbalance in AC voltage and DC bus voltage restoration despite of wide load power variation. Both the desired power and the current among MGs are provided by IC since IC iii current references are generated by only detecting buses voltages. Therefore, AC bus voltage is balanced and sinusoidal with proper magnitude while DC bus voltage is constantly kept at the nominal voltage. In grid-connected HMGs, DC bus voltage is highly ripple when single-phase inverter with variable frequencies (SPI-VF) is operated in DC MG. In order to eliminate the ripple voltage, we present an IC control strategy which can adaptively deal with ripple voltage at different frequencies by controlling IC ripple current. In the proposed approach, instead of SPI current/voltage, only DC bus voltage is required to generate the IC ripple current reference. Besides that, power among MGs is also balanced by controlling IC fundamental current. As a consequence, AC MG can support DC MG in case DC load power changes widely. And DC bus voltage is well maintained at the nominal voltage without ripple. Simulation and experimental results are carried out to validate performance of the proposed IC control techniques.

LINK
http://www.riss.kr/search/Search.do?isDetailSearch=Y&searchGubun=true&queryText=znCreator,%ED%8C%90%EC%9E%A5%EB%AF%BC&colName=bib_t

Low power transformers-R.Khorenovich Balyan -Трансформаторы малой мощности-Роблен Xоренович Бальян

LINK:http://www.mediafire.com/file/v2kprfryq97440d/LOW_POWER_TRANSFORMER.pdf/file