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"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"

"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS  DO MAL"

“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”

“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”

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quarta-feira, 30 de agosto de 2023

Research on Control Strategy of High-power Three-phase Combined Inverter-고전력 삼상 복합 인버터 제어 전략 연구-BY ZHANG HUAYING August, 2020 Department of Electrical Engineering Graduate School of Konkuk University


Thesis for Degree of Master Supervisor: Prof. Younghoon Cho 

Research on Control Strategy of High-power Three-phase Combined Inverter 

Submitted by ZHANG HUAYING 

Department of Electrical Engineering Graduate School of Konkuk University


ABSTRACT 
Research on Control Strategy of High-power Three-phase Combined Inverter Zhang Hua Ying Department of Electrical engineering Graduate School of Konkuk University 

Three-phase voltage-type inverters are used in various occasions, such as static reactive power compensator, uninterruptible power supply distribution network development system, motor control, etc. In today's world where energy is scarce, research on inverters and their control technology is of great significance and is gaining more and more attention. People have higher and higher requirements for inverter power supplies. High-performance, high-reliability high-power inverters are one of the development trends of inverter power supplies. In the high-power inverter power supply, the current on the main circuit power device is relatively large, which can reach hundreds of amps, or even thousands of amps. There are two main ways to increase the capacity of the inverter power supply. And parallel technology using inverters to achieve power modularity. This article takes 30kVA combined three-phase inverter as the research object, adopts PID control method, mainly studies the waveform control of high-power three-phase inverter, and focuses on the main circuit structure and system of high-power three-phase inverter. The mathematical model and waveform control were analyzed and studied in detail. The structure of the three-phase combined inverter suitable for high power is analyzed, the main circuit design of the combined threephase inverter with 30KVA is given, and the combined three-phase inverter established and analyzed under different coordinate systems The mathematical model of the model is simulated and studied according to the parameter settings.


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quarta-feira, 23 de agosto de 2023

Задачник по теории линейных электрических цепей-Problemas sobre a teoria de circuitos elétricos lineares-Shebes M.R., Kablukova M.V.


 

Livro de problemas sobre a teoria de circuitos elétricos lineares 
Shebes M.R., Kablukova M.V. 1990

 O livro fornece um breve material de referência na forma de disposições e relacionamentos básicos, fórmulas de cálculo, tarefas típicas com soluções e explicações detalhadas, exemplos de aplicação de métodos básicos para cálculo de circuitos elétricos em modos estacionários e transitórios, A 4ª edição (3ª 1982) é complementada com problemas para cálculo de filtros polinomiais em relação a parâmetros operacionais, circuitos RC ativos, filtros ARC, etc.

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sábado, 19 de agosto de 2023

Bidirectional interleaved current-fed resonant converter with reduced size of output filter for Fuel cell electric vehicles -출력필터의 크기를 줄인 연료전지 자동차용 양방향 인터리브드 전류원 공진형 컨버터 author Moon Dong-ok=


 





Bidirectional interleaved current-fed resonant converter with reduced size of output filter for FCEV 출력필터의 크기를 줄인 연료전지 자동차용 양방향 인터리브드 전류원 공진형 컨버터 

 Author Moon Dong-ok 
Issue Seoul: Seoul National University of Science and Technology, 2015 
 Dissertation Thesis (Master's) -- Department of Electrical and Computer Engineering, Graduate School of Seoul National University of Science and Technology 2015 Year of issue 2015

ABSTRACT 
 Recently, eco-friendly cars such as an Electric Vehicles (EV), Hybrid Electric Vehicles (HEV) and Plug In Hybrid Electric Vehicles (PHEV) are attracting increasing attention as a solution of environ-mental pollution, global warming and exhaustion of fossil fuels. The low voltage dc/dc converter (LDC) provides power to 12V loads such as the head lamps, wiper blade motor, electronic power steering (EPS), radio system etc. and charges a 12V auxiliary battery from a high voltage battery(200~400V). This application requires an efficient (usually, higher than 90%), compact and light weight dc/dc converter. Also, due to safety and high step down conversion ratio galvanic isolation is generally required. This study proposes a bi-directional interleaved current-fed resonant converter (CRC) with reduced size of the output filter for a fuel cell electric vehicle. The proposed CRC achieves zero-current switching turn on and off of switches and diodes and makes ripple current of the output capacitor theoretically zero. As a result, the cost and volume of the output capacitor are significantly reduced. The two-stage power conversion technique is also applied for wide input and output voltage range operations. A 2kW prototype of the proposed converter is built and tested to verify the validity of the proposed operation
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terça-feira, 15 de agosto de 2023

LIVRO – INVERSORES MONOFÁSICOS-VERSÃO BETA-DR. IVO BARBI-Programa de Pós-Graduação em Engenharia Elétrica da UFSC, pesquisador do Centro Integrado de Pesquisa em Energia Solar da UFSC,


 

IVO BARBI 
O Prof. Ivo Barbi Possui graduação (1973) e mestrado(1976) em Engenharia Elétrica pela Universidade Federal de Santa Catarina e doutorado em Engenharia Elétrica pelo Institut National Polytechnique de Toulouse (1979). Fundador da SOBRAEP – Sociedade Brasileira de Eletrônica de Potência(1990), da qual é Presidente de Honra e Presidente do primeiro COBEP -Congresso Brasileiro de Eletrônica de Potência(1991). Em fevereiro de 2016 liderou a criação do IBEPE-Instituto Brasileiro de Eletrônica de Potência e atualmente é seu Diretor Presidente.

O Prof. Ivo Barbi, membro fundador da SOBRAEP, recebeu em cerimônia híbrida da SOBRAEP às 17h do dia 08/11/2021 em João pessoa na Paraíba, uma homenagem ao seu recente marco em número de orientações entre mestrados e doutorados. A singela homenagem desta sociedade visa reconhecer em forma de gratidão todas as ações que o professor Ivo vêm fazendo em prol da eletrônica de potência no Brasil e no mundo. O momento foi oportuno, pois o professor acaba de atingir o marco de mais de 200 orientações entre mestres e doutores, algo que acreditamos que expressa diretamente tamanha a sua contribuição na área de Eletrônica de Potência e, consequentemente em nossa sociedade. Em sua trajetória, o Prof. Ivo atuou efetivamente para criação e consolidação do Instituto de Eletrônica de Potência (INEP), do Congresso Brasileiro de Eletrônica de Potência (COBEP), bem como desta sociedade e mais recentemente do Instituto Brasileiro de Eletrônica de Potência (IBEPE). Atualmente é Professor Permanente do PPGEEL-Programa de Pós-Graduação em Engenharia Elétrica da UFSC, pesquisador do Centro Integrado de Pesquisa em Energia Solar da UFSC, coordenador do GPEN – Grupo de Pesquisa em Processamento de Energia, cadastrado no CNPq e Diretor Presidente do IBEPE. Foi um dos pioneiros da moderna eletrônica de potência no Brasil, juntamente com os professores Edson Roberto Cabral da Silva e Edson Watanabe. Além de ser membro do IEEE com o grau de LIFE FELLOW e ter recebido IEEE William E. Newell Power Electronics Award em 2020. Junto à Sobraep o Prof. Ivo também possui atuação destacada, colaborando nos Congressos Brasileiros de Eletrônica de Potência, bem como na revista eletrônica de potência.

DEVO AGRADECER PUBLICAMENTE EM MEU BLOG A ATITUDE NOBRE DO DR. IVO BARBI DE COMPARTILHAR SEU CONHECIMENTOS EM ESTE LIVRO MUITO DIDACTICO E COM EXERCICIOS PARA O ENSINO DOS ESTUDANTES DE ENGENHARIA, POSTGRADO ALEM DE PROFISSIONAIS QUE DESEJAM ATUALIZARSE CONTINUAMENTE,QUE DEUS
PROTEJA E ABENÇÕE COM MUITA SAÚDE  O DR. IVO BARBI E FAMILIA.

sábado, 12 de agosto de 2023

Hydrogen Fuel Cell Hybrid Railway Vehicle-BY Kang, DongHun -Department of Electrical Engineering Graduate School, Myongji University-수소연료전지 하이브리드 철도차량을 위한 DC/DC 컨버터 최적 토폴로지 선정 및 설계


 




Optimal Topology Selection and Design of DC/DC Converter for Hydrogen Fuel Cell Hybrid Railway Vehicle BY Kang, DongHun 

Department of Electrical Engineering Graduate School, Myongji University Directed by Professor Lee, Il Oun

 Dissertation Thesis (Master's) -- Department of Electrical Engineering, Graduate School, Myongji University 2020

ABSTRACT
As Korea entered into the 2015 Paris Climate Convention, studies are being actively conducted to reduce the emission of pollutants such as carbon dioxide and fine dust in various fields. In particular, Korea is actively supporting the research and development of eco-friendly transportation means using electricity and hydrogen in the transportation industry, and research related to this is being actively conducted. In 2019, a new pollutant emission standard for railroad vehicles, which was a blind spot for pollutant emissions in Korea, was established, and research is underway to replace aging diesel railway vehicles. In particular, research on hybrid railway vehicles using hydrogen fuel cells with no combustion process and high generation efficiency is being actively conducted. However, since there are no railway vehicles using hydrogen fuel cells developed and operated in Korea, it is necessary to refer to constructing the railway vehicle system based on the successful cases operating in overseas. In this paper, the optimal topology selection and design of DC/DC converter, which charges high-voltage battery by receiving the voltage of fuel cell in hydrogen fuel cell railway vehicle system and supplies power to inverter for propulsion of railway vehicle Deal with. Hydrogen fuel cell railway vehicles have three driving patterns of acceleration, deceleration, and grid connection. The DC/DC converter performs one-way step-up operation in all three driving patterns. Therefore, in this paper, we compare unidirectional step-up converter topology. The optimal topology is selected in a three-level boost converter, in which the semiconductor device has half the voltage stress of the output voltage, and in a two-level interleaving boost converter, in which the semiconductor device has half the current stress of the input current. The specification of DC/DC converter was selected by referring to the railroad cars that are developed and operated overseas because there is no commercially available hydrogen fuel cell railroad car. The final specifications were selected as input voltage 600V, output voltage 1500V, output power 250kW. In this paper, we verify the validity of hardware and controller design and analysis by developing a 20kW miniature converter with the same dynamic characteristics as a 250kW DC/DC converter. Therefore, the 20kW miniature DC/DC converter of this paper is reduced to 600V input voltage, 1200V output voltage, and 20kW output power, but has the same switching frequency as the 250kW DC/DC converter reflecting similar dynamic characteristics. To achieve over 95% efficiency, the 3-level boost converter is designed with a switching frequency of 30kHz and the 2-level interleaving boost converter with a switching frequency of 8kHz. The two-level interleaving boost converter is designed at 8kHz because a high output voltage is applied to the switch, resulting in high switching losses. Designed with switching frequency. In this paper, the three-level boost converter with 20kW capacity and the two-level interleaving boost converter were designed under the worst condition, and the expected efficiency was derived through the loss analysis of the converter according to the output voltage. Various simulation models verify the validity of the hardware and controller design. In particular, the controller design was designed considering the digital delay components of the digital controller, and the validity of the theoretical analysis on the delay components was verified through simulation. As a result of the experiment of the actual hardware, the error between the estimated loss and the actual loss through the simulation was less than 1%, confirming the validity of the loss analysis. When comparing the efficiency, power density, dynamic and static performance among the two topologies, we expect a three-level boost converter to be advantageous. Was verified. In particular, considering the current doubling effect of the three-level boost converter, the sampling frequency was 60kHz, resulting in better dynamic performance. Comparing the experimental results of the three-level boost converter and the two-level interleaving boost converter, the final topology was selected as a three-level boost converter with high efficiency, high power density, and excellent dynamic and static characteristics. Based on the experimental results, the hardware design method, the controller design method considering the digital delay component, the loss analysis and various simulation models are expected to be used to design the actual 250kW DC/DC converter.
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Curso internacional: Dimensión y selección de soluciones para UPS y transformador de aislamiento. Organiza. Capítulo de Ingeniería Eléctrica. COLEGIO INGENIEROS-PERU - CDLIMA.

 Curso internacional:Dimensión y selección de soluciones para UPS y transformador de aislamiento.

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quarta-feira, 9 de agosto de 2023

Course “Electricity and Magnetism. Lectures” by Doctor of Physical and Mathematical Sciences, Professor of the Moscow Institute of Physics and Technology Kozel Stanislav Mironovich.


 Электричество и магнетизм -Профессор  Козел Станислав Миронович

Course “Electricity and Magnetism. Lectures” is designed for second-year students of technical universities. Lectures are given by Doctor of Physical and Mathematical Sciences, Professor of the Moscow Institute of Physics and Technology, Honored Worker of Science of the Russian Federation, Kozel Stanislav Mironovich. 

 The course covers key aspects of electricity, magnetism and the theory of vibrations. Such important concepts as the dipole field, the image method, the electric field in matter, the energy method for calculating forces, the circulation theorem, the magnetic field in matter, electromagnetic induction, forces in a magnetic field, free oscillations, the method of complex amplitudes, spectral analysis in linear systems, Maxwell's equations, electromagnetic waves in waveguides. Each lecture contains theoretical material, demonstrations of experiments, solving practical problems. Theoretical calculations are carried out with the help of knowledge of the basics of integral-differential calculus and vector algebra.

ORIGINAL LINK: https://mipt.lectoriy.ru/lecture/Physics-Electricity-L10-Kozel-131008.01

A STUDY OF THE FACTORS THAT AFFECT LITHIUM ION BATTERY DEGRADATION by SHIHUI XIONG -Dr. Robert O’Connell, Thesis Supervisor MAY 2019 University of Missouri-Columbia


 A STUDY OF THE FACTORS THAT AFFECT LITHIUM ION BATTERY DEGRADATION by Shihui Xiong --Dr. Robert O’Connell, Thesis Supervisor

 ABSTRACT Secondary batteries have been applied in every aspect of our life, from cell phones, to laptops, medical devices, satellites, and renewable energy power stations. Li-ion batteries have shown superior advantages in their ability to store large amount of energy in compact spaces and their long battery life. However, battery capacity degradation, which causes battery failure, posts a serious concern to the economy and efficiency to individuals and industries. The degradation rate is affected by several factors including temperature, charge and discharge voltage, current, and the level at which the battery is charged or discharged. Understanding these factors can largely help to reduce the speed of battery failure and allow batteries to better serve their purpose. First, this thesis project did a review of existing literatures addressing how conditions including temperature, state of charge, depth of discharge, charge voltage, and C-rate affect Li-ion battery degradation rate and the conditions necessary to achieve optimal battery life. An experiment was done to study how battery chemistry, cycle frequency, and temperature affect battery degradation rate and observe how degradation affects battery performance. Results show that high and low temperature shorten battery life, cycle frequency is not consequential with Li-ion battery degradation rate, and INR batteries might have shorter battery life than IMR batteries. These findings will help consumers and companies better understand proper usage of Li ion batteries.
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segunda-feira, 7 de agosto de 2023

A Study on the Economic Impacts of Fuel Cell Bus Development and the Importance of Fuel Cell Bus Supply Expansion Policy -By-Hyun Seok Park Graduate School of Management of Technology Pukyong National University


 


A Study on the Economic Impacts of Fuel Cell Bus Development and the Importance of Fuel Cell Bus Supply Expansion Policy Hyun Seok Park Graduate School of Management of Technology Pukyong National University 

Abstract

 The transition from "Carbon Economy" to "Hydrogen Economy" heralds an innovative change worldwide. The hydrogen economy refers to an economic industrial structure that uses hydrogen as a major energy source. Korea has also announced a roadmap to vitalize the hydrogen economy to take the lead in these changes. Korea plans to build an industrial ecosystem that can lead the global hydrogen economy with its strengths of "Fuel Cell Electric Vehicles" and "Fuel Cells" as the two pillars. Examining the degree of social acceptance of this new innovation, the goal of supplying fuel cell electric vehicles, it is estimated that it is in the process of moving beyond early adopters to early majorities. In order for the hydrogen economy to vitalize, it must pass ‘The Chasm’, a discontinuous surface of social acceptance, and a plan is needed for it. This paper attempted to derive policy implications necessary for vitalizing the hydrogen economy. What is particularly noteworthy is that the development of fuel cell buses and the supply of fuel cell buses contribute greatly to the vitalization of the hydrogen economy. Therefore, the purpose of this study is to present the economic impact of fuel cell bus development and to show the priority among the policies supplying fuel cell bus. As a research method, an input-output analysis was performed to present the economic impact, and a analytic hierarchy process was performed to show the priority among the policies supplying fuel cell bus. This study by input-output analysis redefines the fuel cell bus industry based on the 2018 input-output table and calculates the production, value-added, and employment induction effects caused by exogenous specification and analyzes the forward and backward linkage effects. According to the analysis results, the production induction effect caused by the fuel cell bus is 0.704, the value-added induction effect is 0.267, and the employment induction effect is estimated as 2.944 people/billion won. Moreover, out of the total 34 industries, the forward linkage effect is ranked 17th and the backward linkage effect is ranked 13th, which is analyzed as an industry with a strong intermediate property in both the forward and backward. This study by analytic hierarchy process expressed the support policy for the distribution of fuel cell buses as an AHP hierarchical diagram. And, the survey was conducted on busan metrobus company. For analysis, 'Expert Choice 2000', a specialized program, was used. As a result of the analysis, 45.8% of "supporting the supply of hydrogen charging stations", 34.0% of "supporting the supply of fuel cell buses", 12.5% of "technology advancement", and 7.7% of "institutional support". It can be seen that busan metrobus company evaluated "supporting the supply of hydrogen charging stations" as the most important. The results of this paper are expected to serve as policy guidelines for the expansion of the fuel cell bus industry, and the expansion of fuel cell bus supply is expected to serve as an important trigger for revitalizing the hydrogen economy.

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sábado, 5 de agosto de 2023

Analysis of dynamic performance and compatibility of electric bus based on real-road data by Yu, Tae Hyun- Major of Mechatronics Engineering Department of Mechatronics Engineering Graduate School Korea University of Technology and Education


Analysis of dynamic performance and compatibility of electric bus based on real-road data BY Yu, Tae hyun Major of Mechatronics Engineering Department of Mechatronics Engineering Graduate School Korea University of Technology and Education 
ABSTRACT
 Many countries around the world are regulating the exhaust gas emission of internal combustion engine vehicles. Along with the spread of support policies for the introduction of eco-friendly vehicles, they try to replace conventional internal combustion engine buses with electric buses in large cities. Buses using electricity have a simpler structure and fewer parts than an internal combustion engine, so they are highly reliable and require fewer maintenance elements. In addition, they do not emit pollutants because they use electricity as power. They have low noise and vibration, so they are easy to apply to big city bus routes. In addition, energy price is cheaper than diesel or CNG, and energy consumption efficiency is also high. However, it takes long to charge the battery, and the replacement cycle is relatively short as well as it is expensive. Accordingly, studies on the application of electric buses to bus routes in large cities are being continuously studied. In this paper, it was analyzed whether large electric buses are suitable for application to bus routes in large cities with congested traffic. To this end, a vehicle simulation model was established based on the component parts and vehicle specifications of the electric bus. Then, the basic power performance of the applied electric bus was analyzed through the established vehicle simulation model. In addition, the actual vehicle correlation verification of the vehicle simulation model established through the chassis dynamometer actual vehicle test was performed. For the analysis of the suitability of electric buses for bus route operation in large cities, a vehicle simulation scenario was established based on the actual road data of the Bangkok in Thailand. Through the verified vehicle simulation model, the suitability of operation of the Bangkok city route in Thailand was verified, focusing on the electric energy consumption efficiency of the electric bus and the mileage per charge. It is expected that the simulation model for verifying the applicability of the electric bus in this paper will be very useful in examining the applicability of the electric bus on the bus routes in large cities.

terça-feira, 1 de agosto de 2023

Simulation Tool을 이용한 위상제어 컨버터의 동작 특성 분석-Operation Characteristics Analysis of Phase Control Converter using Simulation Tool by SU -YEON LIM


 

ABSTRACT 
Presently, the specific gravity of the used field of the AC-AC phase control converter in which the effective value and frequency have got the output of the other alternating current by approving the alternating current used for the motoring and dimming circuit, and etc. As the development of the dimming circuit, controlling the brightness of the illumination by the expansion of the illumination industry market using LED along with the development of the various product using the electric motor including an air-conditioner, refrigerator, washing machine, and etc. Due to the development of an industry as the driving source and etc. Increases. In using the power offset required in the device connected to the output terminal to the object using the phase control, it is due to be convenient. The AC-AC phase control converter uses in order to set the power offset of the load in which the part of the input voltage waveform is not delivered to the load and while a switching occurs for every cycle of the alternating current, that is the input voltage, requiring the power offset which is lower than the input electrode value by lowering the effective value of the output voltage and output current and the power offset taking the load. In this paper, PSIM program and PSpice program were used. PSIM program is the program which it simulates by using the ideal element. PSpice program is the program which selects and can simulate the actually used device By using the single phase control converter and three phase control converter (Y-Y wiring) and three phase control converter (Y-∆ wiring) PSIM program and PSpice program among the AC-AC phase control converter among the simulation program, this paper enforced a simulation and inquired into the difference of two programs.

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Switch Mode Power Supply Topologies, a Comparative Study BY Khoo Ghim Wee School of Science and Technology -SIM University


 

Switch Mode Power Supply Topologies, a Comparative Study Khoo Ghim Wee School of Science and Technology A thesis submitted to SIM University in partial fulfillment of the requirements for the degree of Bachelor of Engineering 2009

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