태양전지 및 연료전지용 소용량 하이브리드 인버터 설계 및 구현 Design and Implementation of Hybrid Small-Sized Power Inverter for PV and Fuel Cell

태양전지 및 연료전지용 소용량 하이브리드 인버터 설계 및 구현 Design and Implementation of Hybrid Small-Sized Power Inverter for PV and Fuel Cell 指導敎授崔宙燁 이 論文을 工學博士學位請求論文으로 提出함 

 Design and implementation of small-capacity hybrid inverters for solar cells and fuel cells

 Author Jo Sang-yoon 

http://www.riss.kr/link?id=T15112929

Seoul: Kwangwoon University Graduate School, 2019 

 Dissertation Thesis (Doctoral)-- Kwangwoon University Graduate School: Department of Electrical Engineering 2019.2 Year of issue 2019 2018年12月7日

 ABSTRACT

 Design and Implementation of Hybrid Small-Sized Power Inverter for PV and Fuel Cell As a major source of power for robots and drones that emerged as key elements of the Fourth Industrial Revolution era, solar cells, fuel cells, and lithium-ion batteries are receiving spotlight as batteries that can produce high power for long periods of time. Especially, the global market for solar cells and fuel cells is expanding as new and renewable energy sources. While inverter demand is essential for efficient operation of batteries and studies of high-quality inverter technologies such as solar energy, energy storage devices such as robots, drones, etc. As hybrid technologies that supplement solar energy and fuel cells in battery power are commercialized in the U.S., including Japan, it is imperative to study new power converters and control technologies that add green power to secondary batteries. The purpose of this paper is to design and implement a small-capacity hybrid inverter system for solar cells and fuel cells that efficiently operate robots and controllers, communications and various mission equipment by merging solar cells, fuel cells and lithium-ion batteries. To this end, the electrical model for solar cells, fuel cells and lithium-ion batteries is first established and the architecture of the hybrid inverter system is proposed based on these models. After each component has been designed and verified, the entire system is verified and finally the proposed smallcapacity hybrid inverter system is demonstrated by mounting the actual robot's power system. This paper proposes the structure and function of hybrid inverter systems by establishing an electrical equivalent linear model, understanding the power characteristics of solar cells, fuel cells and lithium-ion batteries with different principles of energy generation. Each module proposes a new method of impedance matching maximum power point tracking control technology that is essential to the design of the buck converter for solar cells and fuel cells. It also designs an interleaved, bidirectional DC-DC converter with a high-passing ratio for optimal charging of lithium-ion batteries and proposes an efficiency analysis method in the multiplier mode. In addition, it proposes a two-way DC-DC converter that simultaneously takes into account efficiency and stability. The proposed hybrid inverter system is implemented as a small-capacity hybrid interver system for solar cells and fuel-cells by proving its effectiveness through simulation and practical experiments at the module and system level and by applying it to actual mobile robots. In conclusion, the research proposed a small hybrid inverter system for solar cells and fuel cells provides power conversion solutions suitable for robots, drones, wearable devices, and mobile electronics. Futhermore, Combined with other energy storage devices other than lithium-ion batteries, it is also able to be applied as a power converter for large capacity ESS. Therefore, it presents the possibility of independent products as modules and system technologies for low-cost, long-term, and high-power inverter technologies in the future renewable energy sector.

LINK: http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=513893263f37c12effe0bdc3ef48d419&keyword=HYBRID%20INVERTER

【パワエレ】LLCコンバータの簡易設計 Design Example of LLC Converter-[Power electronics] Simple design of LLC converter Design Example of LLC Converter

 

Self-powered Sensor Monitoring System in Industrial Internet of Things using Off-resonance Piezoelectric Energy Harvesting Techniques by Jae Yong Cho -Dissertation for the degree of Doctor of Philosophy-Graduate School of Hanyang University-

 Dissertation for the degree of Doctor of Philosophy Self-powered Sensor Monitoring System in Industrial Internet of Things using Off-resonance Piezoelectric Energy Harvesting Techniques 

by Jae Yong Cho

 Graduate School of Hanyang University February 2019 

Department of Electrical Engineering Graduate School of Hanyang University 

 ABSTRACT 

 The main keyword in the era of the fourth industrial revolution is IIoT (Industrial Internet of Things) that enables the interactive network between devices, vehicles, home appliances, and other items embedded with electronics, software, sensors, actuators and etc. To realize IIoT world, there are key technologies; sensors, microcontroller, connectivity, and energy management. Especially, in terms of energy management, many researches have been carried out about self-powering, a battery-less device from energy harvesting. At the center, there is piezoelectric energy harvesting technology, which converts mechanical energy into electrical energy. Lots of researches about piezoelectric energy harvesting have been carried about because piezoelectric material has relatively high power density and is easily applicable to various infrastructures like road, building, and factory close to our daily lives. Ultimately, the goal of this technology is heading for energy saving and simple installation of sensors used for monitoring structural condition without inconveniences such as the replacement of the batteries and the complexity of the cables. In this dissertation, the research about design and fabrication of off-resonance type piezoelectric energy harvesting systems for IIoT sensor was discussed. Because the actual frequency environment in a real field is not geared to resonant frequencies, previous piezoelectric energy harvesting systems were difficult to harvest ambient energy efficiently. We developed the techniques for harvesting energy efficiently through new structures of off-resonance piezoelectric energy harvesters according to various frequency environment. As the final step, the demonstration study was conducted to illustrate IIoT platform as V2I (Vehicle to Infrastructure) system from the piezoelectric energy harvesting techniques. The developed harvester was fabricated and installed on the highway (Yeoju-si, Gyeonggi-do, South Korea). As a result, self-powered temperature sensor monitoring system was constructed using the energy harvester to be able to operate wireless temperature sensor (eZ430-RF2500, Texas Instruments, USA) without battery. Finally, the system was established to inform a driver of the freezing condition on the road in advance as V2I system. First, the design and fabrication of the resonance dependent type energy harvester were conducted. We have developed the piezoelectric energy harvester using wind that is dependent on the resonant frequency, which is a key component of piezoelectric power generation. The experiment result showed that the difference in power generation characteristics when and when not at resonant frequencies makes difficult for the energy harvester to be applied to actual industrial environments where frequencies vary. Finally, it is essential to develop energy harvesters considering these diverse frequency environments. Second, the studies of energy harvesters optimized for different types of frequency environments in industries were conducted. The frequency environment was divided in four conditions (single frequency, multi frequency, random frequency, and intermittent frequency). For single, multi and random frequency conditions, a magneto-mechanical system was applied as the method of harvesting more energy utilizing magnetic forces. For an intermittent condition, system design was conducted as the method to overcome the offresonance region. In single frequency environment, conveyor belts within a smart factory were presented as an experimental environment and the study was conducted to overcome an environment using magnets on the core belt that is much lower than the resonant frequencies of a typical piezoelectric device. In multi frequency environment, water pipes located in plants or buildings were presented as an experimental environment, and to harvest more energy, a hybrid system using piezoelectric energy harvester and electromagnetic energy harvester was studied. In a random frequency environment, the railway was proposed as experimental condition and the magnetic pendulum energy harvester utilizing inertial moments was developed. The energy harvester for the intermittent frequency environment was studied, taking into account the wireless switch that is sometimes pressed by humans as one of the intermittent frequency environments. Third, the research was carried out on the energy harvesting circuit, which is essential for applying the energy harvester to the actual IIoT environment. Preferentially, equivalent circuit modeling of piezoelectricity and impedance matching study was conducted to deliver maximum power. The DC-DC converter study was also conducted to convert high voltage of the piezoelectricity into low voltage so that actual sensor applications can be self-driven by the energy harvester. Additionally, the research was conducted to create the desired output voltage, and finally to establish the wireless communication interface.

VIEW FULL THESIS: https://www.mediafire.com/file/41mjvvokgymxczk/Self-powered+Sensor+Monitoring+System+in+Industrial+Internet+of+Things+using+Off-resonance.pdf/file

Projeto otimizado para minimização de perdas em um conversor bidirecional aplicado a sistemas autônomos de iluminação-Tese de doutorado- Autoria:Duarte, Renan Rodrigo-UNIVERSIDADE FEDERAL DE SANTA MARIA-BRASIL

 

RESUMO 

O presente trabalho apresenta o desenvolvimento de um sistema autônomo de iluminação pública baseado em energia solar fotovolaica e diodos emissores de luz (LEDs). O sistema deve ser capaz de carregar um banco de baterias durante o dia através de um arranjo fotovoltaico e suprir uma carga LED durante a noite. Um conversor bidirecional com transistores de nitreto de gálio (GaN) é utilizado de forma a obter uma estrutura com elevado rendimento e, com isso, otimizar o tamanho do banco de baterias e arranjo fotovoltaico para maximizar a autonomia do sistema ou reduzir os custos de produção, dependendo dos objetivos da aplicação. Foi desenvolvida uma metodologia completa e otimizada para o projeto dos elementos deste sistema autônomo de iluminação. Esta metodologia baseia-se em um algoritmo de busca discreta que avalia um conjunto de componentes disponíveis comercialmente para determinar a melhor combinação de componentes e o melhor ponto de operação do circuito, de modo a minimizar as perdas de energia ao longo do período de operação do sistema. Neste documento é apresentada, inicialmente, uma revisão bibliográfica de aspectos teóricos relacionados aos sistemas autônomos de iluminação, como fonte fotovoltaica, baterias, carga LED, topologias de conversores e soluções comerciais disponíveis. Uma revisão sobre interruptores GaN também é apresentada, abrangendo seu histórico, princípio de funcionamento, características e estado da arte da tecnologia em termos de dispositivos comerciais. Para validar experimentalmente a topologia proposta, um protótipo de 100 W com frequência de comutação arbitrária foi desenvolvido e avaliado. No modo carregador de bateria, o circuito opera em 250 kHz e apresenta eficiências maiores que 92% em toda a faixa de potência com um valor máximo de 97,3%. No modo driver de LED, a frequência de operação escolhida foi de 345 kHz e uma eficiência máxima de 95,8% foi obtida. Para a validação da metodologia de projeto proposta, quatro conversores com potências de 30 W em modo driver e 150 W em modo carregador foram implementados e testados em diferentes pontos de operação. Com isso, comprovou-se que, considerando um conjunto de componentes, a metodologia é capaz de determinar o melhor ponto de operação para maximizar o rendimento, e, considerando diferentes conjuntos de componentes, determinar o melhor em termos de redução da energia perdida, de forma a maximizar a autonomia do sistema.

VER TESE COMPLETA:

 https://repositorio.ufsm.br/bitstream/handle/1/25767/TES_PPGEE_2022_DUARTE_RENAN.pdf?sequence=1&isAllowed=y

Doctoral Dissertation A Three-Phase SCVD Based Boost Inverter with Low Common Mode Voltage for Transformerless Photovoltaic Grid-Connected System Department of Electrical Engineering Graduate School, Chonnam National University BY Tran Tan Tai

(Abstract)

 This study deals with a new type of inverter called a three-phase SCVD based boost inverter. The introduced structure is a combination of an SCVD network and the three-phase bridge to restrict the common-mode voltage. Therefore, the introduced inverter can produce a high output voltage from the low input voltage. The DC-bus voltage of the introduced solution stands at twice of the input voltage. Moreover, the variation in common-mode voltage can o be restricted within one-sixth of DC-bus voltage. Modeling, circuit analysis, operating principles, and a comparison between the introduced SCVD based boost inverter with the other VSIs are performed. To confirm the performance improvements of the introduced SCVD based boost inverter, a preliminary prototype of the introduced SCVD based boost inverter is built in the laboratory and the simulation studies based on PLECS environment and experimental studies are performed. Besides that, a modified SCVD based boost inverter is also introduced to step up the DC-bus voltage to triple of input voltage instead of twice of input voltage like that in the proposed SCVD based boost inverter. Furthermore, a common-mode voltage of the modified SCVD based boost inverter is x canceled through switching the four extra active-switches based on the Boolean logic function. As a result, common-mode voltage is maintained as constant at the value of 0 V during all time. Moreover, the voltage stress across additional semiconductor devices is standing at one-third of DC-bus voltage. The simulation studies based on PLECS environment prove the effectiveness of the modified SCVD based boost inverter. Finally, to validate the performance, operating principle, and feasibility of the modified SCVD based boost inverter, the experimental studies based on the laboratory prototype with a DSP F280049C are carried out. Doctoral Dissertation A Three-Phase SCVD Based Boost Inverter with Low Common Mode Voltage for Transformerless Photovoltaic Grid-Connected System Department of Electrical Engineering Graduate School, Chonnam National University BY Tran Tan Tai (Abstract) This study deals with a new type of inverter called a three-phase SCVD based boost inverter. The introduced structure is a combination of an SCVD network and the three-phase bridge to restrict the common-mode voltage. Therefore, the introduced inverter can produce a high output voltage from the low input voltage. The DC-bus voltage of the introduced solution stands at twice of the input voltage. Moreover, the variation in common-mode voltage can o be restricted within one-sixth of DC-bus voltage. Modeling, circuit analysis, operating principles, and a comparison between the introduced SCVD based boost inverter with the other VSIs are performed. To confirm the performance improvements of the introduced SCVD based boost inverter, a preliminary prototype of the introduced SCVD based boost inverter is built in the laboratory and the simulation studies based on PLECS environment and experimental studies are performed. Besides that, a modified SCVD based boost inverter is also introduced to step up the DC-bus voltage to triple of input voltage instead of twice of input voltage like that in the proposed SCVD based boost inverter. Furthermore, a common-mode voltage of the modified SCVD based boost inverter is canceled through switching the four extra active-switches based on the Boolean logic function. As a result, common-mode voltage is maintained as constant at the value of 0 V during all time. Moreover, the voltage stress across additional semiconductor devices is standing at one-third of DC-bus voltage. The simulation studies based on PLECS environment prove the effectiveness of the modified SCVD based boost inverter. Finally, to validate the performance, operating principle, and feasibility of the modified SCVD based boost inverter, the experimental studies based on the laboratory prototype with a DSP F280049C are carried out.

VIEW FULL DOCTORAL DISSERTATION:

http://www.riss.kr/search/Search.do?colName=all&isDetailSearch=N&searchGubun=true&oldQuery=&sflag=1&fsearchMethod=search&isFDetailSearch=N&searchQuery=A+Three-Phase+SCVD+Based+Boost+Inverter+with+Low+Common+Mode+Voltage+for+Transformerless+Photovoltaic+Grid-Connected+System&kbid=&pageNumber=1&query=A+Three-Phase+SCVD+Based+Boost+Inverter+with+Low+Common+Mode+Voltage+for+Transformerless+Photovoltaic+Grid-Connected+System

LINK ALTERNATIVO DOCTORAL DISSERTATION:

https://www.mediafire.com/file/ciiom9klno2j511/A+Three-Phase+SCVD+Based+Boost+Inverter+with+Low+Common+Mode+Voltage+for+Transformerless+Photovoltaic+Grid-Connected+System.pdf/file

GaN MOSFET를 이용한 유도전동기 구동용 고효율 인버터에 관한 연구 = A Study on the high efficiency inverter for driving an induction motor using GaN MOSFET by Park, Sang-Yong- Dept. of Electronic Engineering The Graduate School Hanyang University

   

A Study on the High Efficiency Inverter for Driving an Induction Motor using GaN MOSFET Park, Sang-yong Dept. of Electronic Engineering The Graduate School Hanyang University

ABSTRACT 

 It was proved in this paper that the efficiency of the inverter using GaN MOSFET ,which is regarded as a next generation power semiconductor, was much improved comparing the efficiency to the counterpart using the conventional Si MOSFET. Comparing the characteristics of GaN MOSFET to those of Si MOSFET, GaN MOSFET shows very low on resistance and very fast switching speed due to the high breakdown voltage and very small parasitic capacitances. Therefore, using GaN MOSFET as switching devices of the inverter, it is expected that the efficiency and characteristics of the inverter can be improved since the switching and conduction losses and switching noise can be reduced. In this paper, to demonstrate the superiority of GaN MOSFET to Si MOSFET, the inverter using GaN MOSFET for driving a 2.2 kW induction motor was fabricated. The design specification of the inverter fabricated is as follows: input voltage is 220 Vac, switching frequency is 20 kHz, and the operating frequency is 0 to 70 Hz. The fabricated inverter was tested and the normal operation of the inverter was confirmed. Finally the efficiency of the inverter was measured and the results of measured efficiency was compared to those of Si MOSFET inverter with the same specification as the GaN MOSFET inverter fabricated. From the comparison results, it is known that the efficiency of the GaN MOSFET inverter is superior to that of Si MOSFET inverter at the full range of load. The maximum efficiency of the GaN MOSFET inverter was measured as 98.41 %.

VIEW FULL TEXT:

http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=8f84b308625e5129ffe0bdc3ef48d419&keyword=inverter%20gan

ESTRUCTURAS DE CONVERSIÓN PARA SISTEMAS FOTOVOLTAICOS DE ALTA POTENCIA Memoria que, para optar al grado de Doctor Ingeniero Industrial, por Mikel Borrega Ayala -DEPARTAMENTO DE INGENIERIA ELECTRONICA-UNIVERSIDAD PUBLICA DE NAVARRA

 

1.2 Objetivos de la tesis

. La red eléctrica es de naturaleza alterna, con lo que si se quiere inyectar energía en la red se debe de hacer mediante corriente alterna. Sin embargo, la corriente proporcionada por un generador fotovoltaico es de naturaleza continua. Es por ello que se hace necesaria la utilización de una etapa de conversión electrónica DC/AC, denominada inversor. En las instalaciones fotovoltaicas de conexión a red se utilizan tanto inversores trifásicos, que inyectan la potencia generada a una red trifásica, como inversores monofásicos que la inyectan a una fase. Normalmente, en instalaciones de potencias inferiores a 4.6-6kW4, se utilizan inversores monofásicos. En instalaciones de más potencia, tanto domésticas como grandes plantas, se utilizan inversores trifásicos.

Esta tesis se va a centrar en los inversores fotovoltaicos de conexión a red utilizados en grandes plantas de generación eléctrica. Tal y como se ha apuntado anteriormente, estas instalaciones tienen una potencia de entre 1MW y los 247MW de la instalación más grande del mundo a día de hoy. Se suelen ubicar en lugares con una alta irradiación, aprovechando terrenos de escaso valor urbanístico o para la agricultura. El factor económico es, por lo tanto, el principal parámetros a tener en cuenta en el diseño de este tipo de instalaciones ya que se busca la mayor rentabilidad. Así, los costes de todos los elementos que componen la instalación, incluido el inversor, tienen que ser lo menor posibles. El coste del inversor en relación a la potencia del mismo, ratio €/Vat, suele ser mejor en los inversores de mayor potencia y es por ello que, en este tipo de instalaciones en las que se busca una etapa de conversión lo más económica posible, se utilizan los mayores inversores del mercado con potencias de entre 500kW y 1MW, en lugar de una cantidad mayor de inversores de menor potencia. Es precisamente el diseño de estos inversores de gran potencia el objetivo principal de esta tesis.

Cabe destacar que el hecho de que se busque la instalación más económica posible no siempre va ligado a que el inversor tenga que ser lo más barato posible. Lo importante es conseguir la mayor rentabilidad de la totalidad de la instalación, y eso requiere en ocasiones encarecer ligeramente el inversor si con ello se mejoran ciertas prestaciones del mismo que finalmente desembocan en el abaratamiento de otro elemento de la instalación, o en el aumento de la productividad de la misma.

El factor más importante que hace que las características de un inversor difieran de las de otros, es la arquitectura utilizada en cada uno de ellos. En estos inversores fotovoltaicos de alta potencia existen tres topologías principales. La primera de ellas es el Inversor Centralizado (IC). Se trata de una etapa de conversión única por la cual circula la totalidad de la potencia inyectada a la red. Por un lado entra la potencia proveniente del campo solar, que es de carácter continuo. El inversor convierte la potencia en forma alterna para poder inyectarla a la red eléctrica que es también de carácter alterno. La red eléctrica a la que se conectan este tipo de inversores de gran potencia es de tipo IT, con el neutro aislado de tierra.

VER LA TESIS COMPLETA:  https://academica-e.unavarra.es/xmlui/bitstream/2454/29278/1/04%20Tesis%20doctoral%20Mikel%20Borrega%20Ayala.pdf

Analysis, Design, and Control of a Modular Multilevel Series-Parallel Converter (MMSPC) Zur Erlangung des akademischen Grades eines DOKTOR-INGENIEURS von der KIT-Fakultät für Elektrotechnik und Informationstechnik des Karlsruher Instituts für Technologie (KIT)

Analysis, Design, and Control of a Modular Multilevel Series-Parallel Converter (MMSPC) Zur Erlangung des akademischen Grades eines DOKTOR-INGENIEURS von der KIT-Fakultät für Elektrotechnik und Informationstechnik des Karlsruher Instituts für Technologie (KIT) genehmigte

 DISSERTATION von M.Eng. Christian Korte geb. in: Gerolstein

 Vorwort 

Diese Arbeit entstand während meiner Tätigkeit als wissenschaftlicher Mitarbeiter am Elektrotechnischen Institut (ETI) des Karlsruher Instituts für Technologie (KIT). Im Rahmen einer wissenschaftlichen Kooperation hatte ich die Möglichkeit einen neuartigen Ansatz zur Realisierung des elektrischen Automobil-Antriebsstrangs zu erforschen. Dieser Ansatz, der Modular Multilevel Series-Parallel Converter (MMSPC), zieht eine umfassende Umgestaltung der elektrischen Automobil-Architektur nach sich. Aus diesem Grund habe ich mir die Aufgabe gesetzt, einen möglichst fundamentalen wissenschaftlichen Vergleich zwischen dem herkömmlichen Ansatz und dem MMSPC zu erarbeiten. Ferner habe ich mich darauf konzentriert, die Leistungsfähigkeit des MMSPC durch Regelung zu erhöhen. Ohne die durchgehende Unterstützung aus meinem privaten und beruflichen Umfeld wäre es nicht möglich gewesen, diese Arbeit erfolgreich abzuschließen. Dafür möchte ich mich bei allen Beteiligten herzlich bedanken. Insbesondere gilt dieser Dank meinem Doktorvater Prof. Dr.-Ing Marc Hiller, der es mir ermöglicht hat mit großer wissenschaftlicher Freiheit an meiner Arbeit zu forschen. Bei Prof. Dr.-Ing Dieter Gerling bedanke ich mich ebenfalls für die Begutachtung und die Übernahme des Korreferats. Zudem möchte ich mich bei Prof. Dr.-Ing Malte Jaensch und Prof. Dr.-Ing. Stefan Götz bedanken, für das entgegengebrachte Vertrauen und die große Unterstützung während meiner Tätigkeit bei Porsche Engineering. Ohne die außergewöhnliche Atmosphäre und Kollegialität am ETI wäre die Entstehung dieser Arbeit mit deutlich weniger Freude und guten Erinnerungen verbunden. Dafür bedanke ich mich bei allen Kollegen und Studenten des ETI, mit denen ich das Vergnügen hatte zu Arbeiten. Mein Dank richtet sich insbesondere an Daniel, für die viele Hilfe bei meinen Publikationen, dafür dass Du immer die Wissenschaft am ETI vorangetrieben hast und vor Allem für die ganzen unvergesslichen Erlebnisse die wir geteilt haben. Weiterhin möchte ich mich bei Firat, Patrick, Simon, Felix, Felix und Tobi für Eure andauernde Unterstützung und die großartige Zeit bedanken. Seit meiner Kindheit haben mir meine Eltern und (meistens) meine Schwester jederzeit den Rückhalt gegeben, den ich benötigte um erfolgreich meine Fortbildung und meine Promotion zu bestehen. Dafür bedanke ich mich herzlichst, denn ohne Euch hätte es nicht klappen können. Während meiner Promotion hat Ravina am meisten miterlebt, wie ich mit der Arbeit gekämpft habe. Dennoch hast Du mir immer geholfen das Beste aus mir herauszuholen und immer an meinen Erfolg geglaubt. Danke dafür und dass Du eine wundervolle Freundin bist!

VIEW FULL THESIS:

https://publikationen.bibliothek.kit.edu/1000143696/148566983

THE SMART: PROVIDING SERVICE TO THE ELECTRIC NETWORK AND ADDRESSING THE RELIABILITY CHALLENGES THROUGH POWER ROUTING by Dr Marco Liserre de la Univ de KIEL

 

Conferencia con el Dr Marco Liserre de la Univ de KIEL THE SMART: PROVIDING SERVICE TO THE ELECTRIC NETWORK AND ADDRESSING THE RELIABILITY CHALLENGES THROUGH POWER ROUTING POR EL ANIVERSARIO DEL PROGRAMA DE INGENIERIA ELECTRONICA DEL INSTITUTO CELAYA MEJICO CON LA APRESENTACION DEL PROF. VAZQUEZ NAVA.

ORIGINAL SOURCE: https://ne-np.facebook.com/ing.electro.itc/videos/conferencia-con-el-dr-marco-liserre/937797433441606/

Transferencia de energía inalámbrica para alimentación de implantes médicos: diseño y optimización del enlace inductivo y de la topología conversora de energía Author Rodriguez Tallón, Juan Carlos--Master thesis

 

Description 

Title Transferencia de energía inalámbrica para alimentación de implantes médicos: diseño y optimización del enlace inductivo y de la topología conversora de energía 

Author/s Rodríguez Tallón, Juan Carlos

 Contributor/s Alou Cervera, Pedro Jiménez Carrizosa, Miguel Item 

Type Thesis (Master thesis) Masters title Electrónica Industrial 

Date 2020

 Subjects ElectronicsIndustrial EngineeringMedicine Freetext Keywords Convertidores conmutados, WPT, IPT, Electrónica de Potencia, Electrónica Implantable Faculty E.T.S.I. Industriales (UPM)

 Department Automática, Ingeniería Eléctrica y Electrónica e Informática Industrial 

Creative Commons Licenses Recognition - No derivative works - Non commercial

VIEW FULL THESIS:https://oa.upm.es/57840/1/TFM_JUAN_CARLOS_RODRIGUEZ_TALLON.pdf

Doctoral Dissertation Multi Level Inverter System using Dual Output DC-DC Converter with High Gain Department of Electrical Engineering Graduate School, Chonnam National University BY Ibadullaev Anvar -2021

 

Doctoral Dissertation Multi Level Inverter System using Dual Output DC-DC Converter with High Gain Department of Electrical Engineering Graduate School, Chonnam National University Ibadullaev Anvar February 2021 Multi Level Inverter System using Dual Output DC-DC Converter with High Gain Ibadullaev Anvar Department of Electrical Engineering Graduate School Chonnam National University (Supervised by Professor Park SungJun) 

(Abstract)

 Electricity has a weighty and an important impact on the social, industrial and economic developments of countries around the world because it is an essential ingredient of modern civilization. XXI century civilization depends on constant accessibility of this wealth in order to continue the present form of life and developing. Recently, with the development of green energy producing technology, the use of renewable sources such that photovoltaic arrays(PV), fuel cell sources, etc. have been increasing rapidly. Depending on the new research report published by “Markets and Market“, the inverter market is projected to grow from USD 12.8 billion in 2020 to USD 26.5 billion by 2025. The inverter market is likely to exhibit lucrative growth potential during the forecast period. The growth of the inverter market is expected to be driven by continuosly rising number of industrial and household solar rooftop installations. This exponentially growth of the inverter selling segment can be understood the entering of photovoltaic energy generation plants, HEV(hybrid electric vehicles) and electric vehicles charging stations that has brought new opportunities and challenges in the power electronics industry, especially in terms of the research and development of the main traction three phase AC motor drives. The multilevel inverter structure based topologies gives the OK to these vehicles to hold out to high voltages and power levels without using bulky and hard transformers. And also, the limited installation spaces of the HEVs have also led to the requirement for small size and power efficient inversion devices. Among end users, the residential segment held the largest share of the inverter market in 2019. Continuously rising electricity bills, coupled with supportive government policies worldwide, have led to the increasing adoption of energy conservation measures such as solar rooftop installations for controlling the increased energy expenditure in residential applications. Countries such as Japan, the United States, the Netherlands and Australia which are among the prominent markets for residential rooftop solar installations, have widely adopted solar inverters over conventional non-solar inverters. In addition, countries such as Brazil, the United Kingdom, India and Mexico are currently witnessing significant growth in the residential solar energy market. In modern smart grid solutions, control technologies for the consumption can response based on information about the electricity generation and transmission system and prices in an automatic way to improve the performance and reliability of the system. Demand for better designed hardware topology and controllers is constantly rising as the renewable energy market continues to sharply grow. In a typical residential, or small factory utility photovoltaic arrays are connected in series, in parallel or mixed type to form high DC voltage bus to can connect to DC-AC inverter, which then is connected directly to single or three phase AC Grid. Using renewable power generation systems established with step up dc-dc converters is being popularized because of the rising demand of zero pollution and eco friendly renewable energy sources. In this study, a new constructed multi level inverter system using dual outptut DC–DC converter was proposed to match a low DC voltage output sources, such as photovoltaic source or fuel cell systems with single phase AC grid bus lines. When comparing to other conventional multi level inverters, the proposed multi level inverter has a decreased number of the semiconductors, can create higher quality power with lower THD values, has decreased and balanced voltage stress for dual output dc-dc converter DC capacitors. The proposed topology requires a single DC source. In final, the output viability of the proposed topology is described by simulation and experimental results with 1 kW hardware prototype. While comparing to another counterparts step-up DC–DC converters, the proposed Multi Level Inverter System using Dual output DC-DC converter with high gain performs higher gain and has lower inductor current ripple and lower drain-source voltage stress for power semiconductors. Also the proposed dual output DC-DC converter with high gain creates dual DC voltage output and voltage stresses for the active and passive components have been decreased which is the main superiority of the proposed topology. Steady state analysis in CCM(continuous conduction mode) of the proposed topology is detailly performed. And also the laboratory prototype of the proposed topology is assembled using low voltage low  power switches and low  capacitors. Output DC voltage and AC current control algorithm is performed by employing DSP TMS320F28069F controller based control board. The performance of the proposed topology is verified by a lot of simulation and experimental results.

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ORIGINAL SOURCE: http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=7aa262e880813a19ffe0bdc3ef48d419&keyword=INVERTER

Next-Generation Ultra-Compact/Efficient Data-Center Power Supply Modules A thesis submitted to attain the degree of DOCTOR OF SCIENCES of ETH ZURICH (Dr. sc. ETH Zurich) presented by GUSTAVO CARLOS KNABBEN

 

Next-Generation Ultra-Compact/Efficient Data-Center Power Supply Modules 

A thesis submitted to attain the degree of DOCTOR OF SCIENCES of ETH ZURICH (Dr. sc. ETH Zurich) presented by GUSTAVO CARLOS KNABBEN MSc EE, UFSC born on 23.05.1992 citizen of Joinville, Brazil accepted on the recommendation of Prof. Dr. Johann W. Kolar, examiner Prof. Dr. Marcelo Lobo Heldwein, co-examiner

Abstract

 The increasingly-electric future requires next-generation power supplies that are compact, efficient, low-cost, and ultra-reliable, even across mains failures, to power mission-critical electrified processes. Hold-up time requirements and the demand for ultra-high power density and minimum production costs, in particular, drive the need for DC/DC power converters with (i) a wide input voltage range, to reduce the size of the hold-up capacitor, (ii) soft-switching over the full input-voltage and load ranges, to achieve low losses that facilitate a compact realization, and (iii) complete PCB-integration for low-cost manufacturing. Wide-bandgap power semiconductors, with excellent on-resistance properties and low switching and reverse-recovery losses, come along these requirements toward the conceptualization of nextgeneration power-supply modules, but cannot alone catapult state-of-theart converter technology to the performance baseline of future automotive, automated manufacturing and hyperscale data-center applications. Instead, the combination of wide-bandgap devices with proper converter topology, control and magnetics design has proven to be the real enabler of power supplies for the increasingly-electric future. This thesis makes a case for the combination of these three features (widebandgap devices, proper topology/control and advanced magnetics) as the keys for paving the way toward next-generation power-supply modules. Therefore, a suitable low-complexity circuit topology with improved control scheme that operates across a wide-input-voltage range with complete softswitching is identified, which switches efficiently at higher frequencies and high output currents with PCB-integrated magnetics, improving significantly power density compared to state-of-the-art designs. This topology embeds a sophisticated PCB-integrated matrix transformer that has a single path for the magnetic flux, ensuring equal flux linkage of parallel-connected secondary windings despite possible geometric PCB-layout asymmetries or reluctance imbalances. The so-called snake-core transformer avoids the emergence of circulating currents between parallel-connected secondary windings and guarantees proper operation of parallel-connected, magnetically-coupled converter modules. The benefits of the proposed topology, control scheme and transformer design are validated by three fabricated 300 V-430 V-input, 12 V-output DC/DC hardware demonstrators. The converters utilize an LLC-based control scheme for complete soft-switching and the snake-core transformer to divide the output current with a balanced flux among multiple secondary windings. First, a 3 kW DC/DC series-resonant converter achieves 350Win3 (21”4 kWdm3) vii Abstract power density and 94 % peak efficiency, validating control and transformer operation. Then, a second hardware prototype with 1”5 kW showcases a peak efficiency close to 96 % and a power density of 337Win3 (20”6 kWdm3), with full PCB-integration and zero-voltage switching even down to zero load. Finally, the third demonstrator—a magnetically-coupled, input-parallel/outputparallel, two-1”5 kW-module DC/DC converter—achieves a peak efficiency of nearly 97 % and a power density of 345Win3 (21”1 kWdm3) with ideal current sharing among modules and stable operation, important characteristics enabled by the novel snake-core transformer. Detailed loss models are derived for every converter’s component and the measurement results are in excellent agreement with the calculated values. These loss models are used to identify improvements to further boost efficiency, the most important of which is the minimization of delay times in synchronous rectification with either synchronous rectifier ICs embedded into the power-device’s package or, at a minimum, Kelvin-source connections on high-current MOSFETs. The results accomplished in this thesis indicate the necessity of careful topology/control selection and advanced-magnetics design for enabling WBGbased industrial power supplies that will outperform state-of-the-art solutions and catapult them to the next-generation performance standards. None of these features—be it WBG devices, wide-gain-range resonant converters, or advanced PCB-integrated magnetics—will alone enable next-generation power-supply modules, but the thoughtful combination of these technologies and their careful application to the particular application, with emphasis to high-frequency PCB magnetics and soft-switching topologies, which enable compact and cost-effective converters with competitive efficiencies.

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