POWER ELECTRONICS PROF. YONGSUG SUH -PART10-AC-DC CONVERTER 전력전자 및 실험 전북대학교 서용석 - CHONBUCK NATIONAL UNIVERSITY - KOREA OPEN COURSEWARE PART10-

Principles of static power conversion , switching cell structure , DC-DC converter , AC-DC converter , DC-AC converter
POWER ELECTRONICS PROF. YONGSUG SUH - CHONBUCK NATIONAL 
UNIVERSITY - KOREA OPEN COURSEWARE 
PART10- AC-DC converter introduction to Switch-mode Inverter

Power electronics aspects for AC grid connected systems - a revision .-Wilson Komatsu- Escola Politécnica-UNIVERSIDADE DE SÃO PAULO BRASIL

Tese de Livre Docencia DocumentoTese de Livre Docencia
AutorKomatsu, Wilson (Catálogo USP)
Nome completoWilson Komatsu
E-mail E-mailUnidade da USP Escola Politécnica
Área do Conhecimento Eletrônica de Potência
Data de Defesa 2011-09-27
ImprentaSão Paulo, 2011
Banca examinadora Galvão, Luiz Cláudio Ribeiro (Presidente) Kaiser, Walter Kassick, Ênio Valmor Pomilio, José Antenor Suemitsu, Walter Issamu
Título em português
Aspectos de eletrônica de potência em sistemas ligados à rede de corrente alternada - uma revisão.Palavras-chave em português Eletrônica de potência

Resumo em português Vários equipamentos de eletrônica de potência são conectados à rede de corrente alternada (CA), para os mais diversos fins, como conversão de energia, filtragem de corrente e tensão, correção de reativos da rede CA etc. Este trabalho apresenta uma revisão não abrangente, refletindo a experiência do autor, sobre tais equipamentos. São discutidos aspectos de aplicações, modelamento de equipamentos e componentes, controle de conversores, implementação e testes. A abordagem é realizada com o uso de publicações do autor com seus associados, de modo que não se apresenta aqui proposta inédita, mas sim uma integração de conhecimento adquirido.

Título em inglês
Power electronics aspects for AC grid connected systems - a revision
.Palavras-chave em inglês Power electronics
 Resumo em inglês Many power electronics equipment are connected to the alternating current (AC) grid in order to provide different functions, as energy conversion, current and voltage filtering, AC reactive power compensation etc. This work shows an abridged revision, reflecting author's experience, on such equipment. Application aspects, equipment and components modeling, converter control, implementation and tests are discussed. The approach is done using published works from the author with his associates, therefore no unpublished proposal is presented, but instead the acquired knowledge is exposed.

LINK ORIGINAL: http://www.teses.usp.br/teses/disponiveis/livredocencia/3/tde-21052012-181653/es.php
DOWNLOAD: http://www.teses.usp.br/teses/disponiveis/livredocencia/3/tde-21052012-181653/publico//TeseLivreDocenciaWilsonKomatsu.pdf

Wilson Komatsu currently works at the Departamento de Engenharia de Energia e Automação Elétricas (PEA) (POLI), University of São Paulo. Wilson does research in Electronic Engineering and Electrical Engineering. Their most recent publication is 'Digital Control for PLLs Based on Moving Average Filter: Analysis and Design in Discrete Domain.

A Novel Analog Circuit Design for Maximum Power Point Tracking of Photovoltaic Panels - Nesrine Mhiri,Abdulrahman Alahdal,Hamza Ghulman, and Anis Ammous

A Novel Analog Circuit Design for Maximum Power Point Tracking of Photovoltaic Panels Nesrine Mhiri,1 Abdulrahman Alahdal,2 Hamza Ghulman,2 and Anis Ammous1,2 

1Power Electronics Group (PEG), National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia 2DEE, Umm Al Qura University, Makkah, Saudi Arabia
 Advances in Power Electronics Volume 2017 (2017), Article ID 9409801, 9 pages
 https://doi.org/10.1155/2017/9409801

 1. Introduction
 Currently, the production of domestic and industrial energy is based, in large part, on a limited resource: oil. Oil sources are becomingmore andmore rare, while the energy demands of the world rise continually. Since this formof energy covers a large part of the current energy production, it is necessary to find another solution to take over.The imposed constraint is to use an energy source that is economical and less polluting because the protection of the environment has become an important point [1–3]. The search for alternative energy resources has therefore become a crucial issue these days. Many scientific researches have been carried out, not only in the field of nuclear energy production, but also in the sector of unlimited energy sources, such as wind power generation and energy transformation. In the latter case, the design, optimization, and realization of photovoltaic systems are topical issues since they lead to a better exploitation of solar energy [2]. These photovoltaic powers generating systems can be operated in different places: electrification of isolated sites, installation in buildings or direct connection to network of electricity, and so on. A major problem with PV systems is to realize transfer of maximum power from PV generator to load. For several years, manyMPPT controlmethods have been developed and implemented, like Fuzzy Logic Method [4–7], perturbation and observation (P&O) method [5, 6, 8], and Incremental Conductance (Inc.Con.) method [7, 9–11].These techniques are generally complex and expensive to implement [4, 9, 12]. They differ in several aspects like complexity, range of effectiveness, cost, convergence speed, implementation hardware, required sensors, and popularity, plus other respects. However, these techniques are digital implementation. Alternatively, the MPPT can be implemented by analog circuits [13–15]. The potential benefit from analog solution is that theMPPT can be integrated withDC-DCcontroller such that “plug and play” can be expected for many low power PV applications. In fact, integration of certain functions into a normal PWM controller chip is the most desirable way for special applications to reduce the implementation complexity and system cost. In this paper, a new analog MPPT technique suitable for PV system applications is presented and validated by simulations.

LINK ORIGINAL:https://www.hindawi.com/journals/ape/2017/9409801/
DOWNLOAD: http://downloads.hindawi.com/journals/ape/2017/9409801.pdf

Inductor Design Method of DCM Interleaved PFC Circuit for 6.6-kW On-board Charger Bong-Gi You*, Byoung-Kuk Lee* and Dong-Hee Kim - Department of Electrical and Computer Engineering, Sungkyunkwan University, Korea

Inductor Design Method of DCM Interleaved PFC Circuit for 6.6-kW On-board Charger Bong-Gi You*, Byoung-Kuk Lee* and Dong-Hee Kim


Corresponding Author: Department of Electrical Engineering, Chonnam National University, Korea. (kimdonghee@jnu.ac.kr) * Department of Electrical and Computer Engineering, Sungkyunkwan University, Korea. (bongary91@gmail.com, bkleeskku@skku.edu) Received: April 6, 2017; Accepted: July 17, 2017

 Abstract – Because the on-board charger (OBC) is installed in electric vehicles (EVs), high power density is regarded as a key technology. Among components of the OBC, inductors occupy more than 30% of the total volume. Thus, it is important to reduce the volume and the weight of inductors while maintaining thermal stability. Discontinuous conduction mode (DCM) can satisfy these requirements; however, only a few studies have adopted the DCM operation for OBCs because of the large inductor current ripple. In this paper, a design process is proposed for application of the DCM operation to OBCs. In order to analyze the inductor losses accurately, a numerical formula for the inductor current ripple is deduced based on a detailed analysis. Two inductors are fabricated using several ferrite cores and powder cores taking into consideration the inductor size, inductor losses, and temperature rise. In order to verify the analysis and design process, experimental results are presented that show that the designed inductors satisfy the requirements of the OBCs

LINK VIEW FULL TEXT
http://www.jeet.or.kr/LTKPSWeb/pub/pubfpfile.aspx?ppseq=1896

High Frequency Isolated Power Conversion from Medium Voltage AC to Low Voltage DC Shishuo Zhao - Virginia Polytechnic Institute and State

High Frequency Isolated Power Conversion from Medium Voltage AC to Low Voltage DC 
Shishuo Zhao - Virginia Polytechnic Institute and State 

 Abstract
 Modern data center power architecture developing trend is analyzed, efficiency improvement method is also discussed. Literature survey of high frequency isolated power conversion system which is also called solid state transformer is given including application, topology, device and magnetic transformer. Then developing trend of this research area is clearly shown following by research target. State of art wide band gap device including silicon carbide (SiC) and gallium nitride (GaN) devices are characterized and compared, final selection is made based on comparison result. Mostly used high frequency high power DC/DC converter topology dual active bridge (DAB) is introduced and compared with novel CLLC resonant converter in terms of switching loss and conduction loss point of view. CLLC holds ZVS capability over all load range and smaller turn off current value. This is beneficial for high frequency operation and taken as our candidate. Device loss breakdown of CLLC converter is also given in the end. Medium voltage high frequency transformer is the key element in terms of insulation safety, power density and efficiency. Firstly, two mostly used transformer structures are compared. Then transformer insulation requirement is referred for 4160 V application according to IEEE standard. Solid insulation material are also compared and selected. Material thickness and insulation distance are also determined. Insulation capability is preliminary verified in FEA electric field simulation. Thirdly two transformer magnetic loss model are introduced including core loss model and litz wire winding loss model. Transformer turn number is determined based on core loss and winding loss trade-off. Different core loss density and working frequency impact is carefully analyzed. Different materials show their best performance among different frequency range. Transformer prototype is developed following designed parameter. We test the developed 15 kW 500 kHz transformer under 4160 V dry type transformer IEEE Std. C57.12.01 standard, including basic lightning test, applied voltage test, partial discharge test. 500 kHz 15 kW CLLC converter gate drive is our design challenge in terms of symmetry propagation delay, cross talk phenomenon elimination and shoot through protection. Gate drive IC is carefully selected to achieve symmetrical propagation delay and high common mode dv/dt immunity. Zero turn off resistor is achieved with minimized gate loop inductance to prevent cross talk phenomenon. Desaturation protection is also employed to provide shoot through protection. Finally 15 kW 500 kHz CLLC resonant converter is developed based on 4160V 500 kHz transformer and tested up to full power level with 98% peak efficiency.

 LINK WEB : https://vtechworks.lib.vt.edu/bitstream/handle/10919/74969/Zhao_S_T_2017.pdf?sequence=1