“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”

OBRIGADO DEUS PELA VIDA,PROTEGENOS E GUARDANOS DE TODO MAL


AUTOR DO BLOG ENG. ARMANDO CAVERO MIRANDA SAO PAULO BRASIL

quinta-feira, 26 de junho de 2014

Reliability Improvement of H-Bridge Multi-level Inverter for Medium-Voltage and High-Power Induction Motor Drives Young-Min Park, Kwang-Hwan Lee, and Se-Hyun Lee

Power Electronics Building Blocks PEBB  Power Cell

Reliability Improvement of H-Bridge Multi-level Inverter for Medium-Voltage and High-Power Induction Motor Drives Young-Min Park, Kwang-Hwan Lee, and Se-Hyun Lee Abstract - This paper proposes the reliability improvement of H-Bridge Multi-level (HBM) inverter. This reliability can be implemented through modularization of power circuit, distribution of controller, duplication of controller and communication, and continuous operation method in case of power cell failure for driving medium-voltage & high-power induction motor. It is shown that the modularization and expansion characteristics of the HBM inverter are improved since the individual inverter modules operate more independently when using the proposed concept. Also the fault tolerance is increased by using power cell bypass. The proposed design and control methods are described in detail and the validity of the proposed system is verified experimentally in various industrial fields.
Paper number: TKPE-2014-19-2-1 Print ISSN: 1229-2214 Online ISSN: 2288-6281 ✝ Corresponding author: pym@hhi.co.kr, Power Conversion Research Department, Hyundai Heavy Industries Co., LTD. Tel: +82-31-289-5135 Fax: +82-31-289-5150 1 Power Conversion Research Department, Hyundai Heavy Industries Co., LTD. 2 Power Conversion Research Department, Hyundai Heavy Industries Co., LTD. Manuscript received Sep. 23, 2013; accepted Nov. 25, 2013 ─ 본 논문은 2013년 전력전자학술대회 우수추천논문임
LINK
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kipe/JRJJC3/2014/v19n2/JRJJC3_2014_v19n2_99.pdf

Comparative Analysis of Power Losses for Three-Level T-Type and NPC - Payam Alemi, and Dong-Choon Lee - Korean Institute of Power Electronics

 
 

 

Abstract - In this paper, an analysis of power losses for the three-level T-type and neutral-point clamped (NPC) PWM inverters is presented, in which the conduction and switching losses of semiconductor devices of the inverters are taken into account. In the inverter operation, the conduction loss depends on the modulation index (MI) and power factor (PF), whereas the switching loss depends on the switching frequency. Power losses for the T-type and NPC inverters are analyzed and calculated at the different operating points of MI, PF and the switching frequency, in which the four different models of semiconductor devices are adopted. In the case of lower MI, the NPC-type is more efficient than the T-type, and vice versa. The validity of the power loss analysis has been verified by the simulation results.
LINK
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kipe/JRJJC3/2014/v19n2/JRJJC3_2014_v19n2_173.pdf

Analysis of Leakage Inductance for Toroidal Type Flyback Transformer Park, Chang-Soo ; Kang, Byeong-Geuk ; Shin, Kyoung-Gu ; Chung, Se-Kyo Dept. of Control and Instrumentation Eng., Gyeongsang

 

Abstract - This paper presents an analysis of a leakage inductance for a toroidal type flyback transformer. The equation to calculate the leakage inductance is derived using the MMF diagram of the transformer. The analysis for the different types of the cores and winding structures is also provided using the FEM simulation. The winding structures minimizing the leakage inductance are finally discussed from the simulation and experimental results.

LINK1
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kipe/JRJJC3/2014/v19n2/JRJJC3_2014_v19n2_164.pdf

quarta-feira, 25 de junho de 2014

Method to Prevent the Malfunction Caused by the Transformer Magnetizing Inrush Current using IEC 61850-based IEDs and Dynamic Performance Test using RTDS Test-bed - Kang, Hae-Gweon


Abstract – The digital substations are being built based on the IEC 61850 network. The cooperation and protection of power system are becoming more intelligent and reliable in the environment of digital substation. This paper proposes a novel method to prevent the malfunction caused by the Transformer Magnetizing Inrush Current(TMIC) using the IEC 61850 based data sharing between the IEDs. To protect a main transformer, the current differential protection(87T) and over-current protection(50/51) are used generally.
LINK
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kiee/E1EEFQ/2014/v9n3/E1EEFQ_2014_v9n3_1104.pdf

terça-feira, 24 de junho de 2014

BIRNS Emergency Light Fixture-LED Seismic Testing


His video shows BIRNS Emergency Light Fixture-LEDs (ELF-LEDs) during IEEE-344 seismic qualification testing at the National Technical Systems facility. This demanding test sequence uses a tri-axial acceleration table delivering the equivalent of a seismic event at 10Gs of force in the x, y and z axes.

BIRNS ELF-LEDs are advanced, seismically qualified nuclear grade lighting systems that provide 24-40 hours of standby illumination in the event of loss of AC power, which is 3 to 5 times longer than required by the NRC. These rugged, CE marked, RoHS compliant systems have a lamp life of 50,000 hours, and an 11 W power draw.

http://www.birns.com/emergency-light-fixture-led.html

domingo, 22 de junho de 2014

PLL FOR SINGLE PHASE GRID CONNECTED INVERTERS Power Electronics Dept., Technical University- Sofia, Bulgaria





PLL FOR SINGLE PHASE GRID CONNECTED INVERTERS
Mihail Antchev1, Ivailo Pandiev, Mariya Petkova, Eltimir Stoimenov, Angelina Tomova,Hristo Antchev
(Power Electronics Dept., Technical University- Sofia, Bulgaria)
(Electronic Engineering Dept., Technical University- Sofia, Bulgaria)
(R&D Sector, Technical University- Sofia, Bulgaria)

FULL PAPER
https://www.mediafire.com/?b7ow33oet047hk3
 

sexta-feira, 20 de junho de 2014

A Comparative Analysis of Multiloop Voltage Regulation Strategies for Single and Three-Phase UPS Systems Poh Chiang Loh, Michael John Newman,


Abstract—Most of the many reported control algorithms for uninterruptible power supplies (UPSs) use either filter inductor or filter capacitor currents as feedback variables to regulate the output voltage. This paper explores the fundamental performance issues associated with the use of these quantities as feedback variables, with a view to determining their contribution to the transient system response and output harmonic compensation in any particular situation. A proportional plus resonant (P+resonant) compensator is then added into the outer voltage regulation loop to achieve zero steady error, to develop a high performance UPS control algorithm, which is applicable to both single-phase and three-phase systems. Theory, simulation, and experimental results are presented in the paper.
FULL PAPER
https://www.mediafire.com/?vjjvhvmmpfmarsa

segunda-feira, 16 de junho de 2014

Annual International Microelectronics Olympiad of Armenia


Synopsys Armenia is the general organizer of the annual Armenian Microelectronics Olympiad, reflecting the growing development of microelectronics design in Armenia. The competition spotlights Armenia’s brightest and most talented young engineers under the age of 30. Goals of the Armenian Microelectronics Olympiad: Stimulate further development of microelectronics in Armenia and in the participant countries Recognize and inspire young, talented engineers Increase interest in microelectronics among young specialists Understand the level of knowledge in the field of microelectronics among young specialists in participating countries in order to make necessary adjustments to educational programs Create a community of young specialists involved in microelectronics The topics of the Olympiad: Digital IC Design and Test Analog and Mixed Signal IC Design and Test Semiconductor Devices and Technology Mathematical and Algorithmic Issues of EDA All participants of the Armenian Microelectronics Olympiad receive participation certificates. OLYMPIAD TESTS AND PROBLEMS EIGHTH ARMENIAN MICROELECTRONICS OLYMPIAD BROCHURE

WEBSITE ORIGINAL
http://www.synopsys.com/Company/Locations/Armenia/EducationalPrograms

/MicroelectronicsOlympiad/Pages/default.aspx#top

LINK DOWNLOAD OLYMPIAD TEST AND PROBLEMS
http://www.synopsys.com/Company/Locations/Armenia/EducationalPrograms/MicroelectronicsOlympiad/Documents/8thOlympiadTestsandProblems.pdf

segunda-feira, 9 de junho de 2014

Dual Mode PWM/Linear BuckConverter by Sensinga Load Current


Dual Mode PWM/Linear BuckConverter by Sensing a Load Current
 Kyung-hwan Kim
Department of Electronics and Electrical Engineering Graduate School Dankook University ABSTRACT
Recently, the importance for power management IC(PMIC) is emphasized as battery-powered portable electronics such as smartphone are commonly used.In addition,research and development on high efficiency isessential to maximize the use of portable devices that are preferred various functions than in the past.PMIC for high efficiency usually change drastically from Linear regulators to Switching regulators. But the switching regulators have disadvantage of low efficiency compared with linear regulatorat light load conditions. Therefore,this paper is presented the using of linear regulator to increase efficiency at light load conditions and the using of switching regulator at heavy load conditions.

Modeling and design of hybrid power filters: contributions to the performance analysis in distorted voltage grid - Tiago Davi Curi Busarello



 
TitleModeling and design of hybrid power filters: contributions to the performance analysis in distorted voltage grid (written in Portuguese)
Author                        Tiago Davi Curi Busarello
Year2013
FilesMaster Dissertation. Dissertação de Mestrado Tiago Davi Curi Busarello.pdf
 

domingo, 8 de junho de 2014

Operation Analysis of Bipolar Low-Voltage DC distribution system based on Distributed Generation


Operation Analysis of Bipolar Low-Voltage DC distribution system based on Distributed Generation Han, Tae Hee
Department of Electrical Engineering Graduate School, Myongji University
 Supervised by Prof. Byung Moon Han
The DC distribution has higher efficiency than the AC distribution because it easily controls the power flow in the distributed generators, DC load, and battery storage using single power conversion. However, the DC distribution is not easy to block the fault current and it does not have specific standards compared with the AC distribution, which should be prepared through a lot of technical efforts. The DC distribution is divided into unipolar type and bipolar type. The unipolar type has a positive terminal and a negative terminal, while the bipolar type has a positive terminal, a negative terminal, and the ground terminal. Although the structure of unipolar type is simple, the reliability against fault is rather low. On the other hand, the bipolar type has higher transmission capacity and lower rated voltage of the converter, which secures the cost effectiveness. Also it is possible to form a neutral point with advantages of high reliability and stability. In this thesis, many problems that can occur from the operation of bipolar DC distribution in connection with the AC/DC interconnection operation were analyzed. The energy management method for the AC/DC power trade and the operational principle of distributed generator and energy storage were analyzed. In order to analyze the operation and performance of unipolar distribution system, a 3kW-class hardware simulator was built, which is composed of the grid-tied three-level inverter, battery storage, super capacitors, and the voltage balancer. Also the various analysis results through experiments with hardware simulator were described by a variety tests of produces hardware are described.
THESIS LINK
http://www.mediafire.com/view/iyq0ziqvjxq269y/Operation_Analysis_of_Bipolar_Low-Voltage_DC_distribution_system_based_on_Distributed_Generation-2014.pdf

Analysis of PWM Inverter Characteristics for High-Speed Train Drive System






Analysis of PWM Inverter Characteristics for High-Speed Train Drive System
AUTHOR SOON HWAN KWON
MAJOR IN ELECTRICAL ENERGY AND NEW TECHNOLOGY ENG.
DEPT. OF ELECTRONICS AND ELECTRIC ENG.
THE GRADUATE SCHOOL CHUNG-ANG UNIVERSITY

( Abstract )
Interior permanent magnet synchronous motor is in the limelight as traction motor because it has advantages of miniaturization, reducing weight, and saving on maintenance costs. Because high-speed trains are large capacity loads, it is necessary to establish the design and development of inverter topology for driving IPMSM. NPC 3-level inverter has a high voltage rating and low harmonic, and can implement large capacity power conversion system. Also, it is easy to miniaturize and reduce weight because it does not need additional capacitors in comparison with other multilevel inverter topology. In this study, speed control of the IPMSM drives for the next generation domestic high-speed train system using 2-level inverter and NPC 3-level inverter is presented. Simulators of the system are implemented and simulations are performed. Finally, the designed systems are verified by comparison between simulations and experiments.
LINK THESIS
https://www.mediafire.com/?mopph11g5iju1bj

A PWM control strategy for low-speed operation of three-level NPC inverter Department of Electrical and Computer Engineering Graduate School, Pusan National University





 
A PWM control strategy for low-speed operation of three-level NPC inverter based on bootstrap gate drive circuit
Jun-Hyung Jung
Department of Electrical and Computer Engineering Graduate School, Pusan National University Abstract
This paper proposes the pulse with modulation (PWM) control strategy for low- speed operation in the three-level neutral-point-clamped (NPC)inverters based onthe bootstrap gate drive circuit
FULL THESIS
https://www.mediafire.com/?4qfn7i7ell3f8uf

sábado, 7 de junho de 2014

Back-to-Back NPC Switching Technique to Reduce Power Loss of Back-to-Back NPC System for Offshore Wind Farm 2013



Switching Technique to Reduce Power Loss of Back-to-Back NPC System for Off shore Wind Farm HongSeok-Jin
Mechatronics Engineering Cooperation Course Sungkyunkwan University
ABSTRACT
 In this paper,3-LevelNPC is applied as Back-to-Back foroffshore wind farm topology using PMSG.In caseofapplying 3-LevelNPC,each switch can withstand higher voltage than existing 2-Levelinverter,but overallloss of power converters is dramatically increased because amount of switching elemenT is increased.Thus,new switching method issuggested for 3-LevelNPC VSC If suggested method is applied,loss in NPC is minimized.
FULL THESIS
https://www.mediafire.com/?9fyma5k7jvdg4gl

ZVT Resonant Boost Converter with New Auxiliary Circuit Kim Mo Se Dept. of Mechatronics Engineering Sungkyunkwan University 2013


ABSTRACT
Switch mode power supplies have become smaller and lighter due to higher switching frequency. However, higher switching frequency causes lots of periodic losses at switch turn-ON and turn-OFF,resulting in increasing losses of the whole system.Therefore,many converters have been presented that use resonance circuit to reduces witching losses. In this paper,A new zero voltage transition resonant boost converter is proposed.The conventional boost converter generates switching losses at turn ON and OFF,and this causesa reduction in the whole system’sefficiency.The proposed ZVT resonant boost converter utilizes a  method using an auxiliary circuit with a resonant inductor,capacitor and two auxiliary switch. Therefore the proposed zero voltage transition n resonant boost converter reduces switching losses more than the conventional hard switching converter. Also,the experimentis conducted with the 4[kW],30[kHz]converter which steps up the voltage from 200[V]to 400[V].It is confirmed that the result of the experimentand that of the simulation are same,and the validity of the converter is verified.
FULL THESIS
https://www.mediafire.com/?m14iamz6pzj6kj7

sexta-feira, 6 de junho de 2014

The integrated Operation and Design of the DC Distribution Systems combined Wind Turbine and Photovoltaic Power Systems-ANPC BACK TO BACK CONVERTER

The integrated Operation and Design of the DC
Distribution Systems combined Wind Turbin and
Photovoltaic Power Systems

Shin,Soo Cheol
Department of Electrical and
Computer Engineering
Sungkyunkwan University

FULL PAPER
https://www.mediafire.com/?mf2v9343a99mro1

A Study on the Analysis and Improvement of Power Quality Using Real-time Simulator in Distribution System with Distributed Generation AnHeeJin Interdisciplinary Program in Photovoltaic System Engineering The Graduate School of Sungkyunkwan University

ABSTRACT
The distributed generation has been increased significantly.However,there
are some problems caused by distributed generation such as reverse power flow,
voltage fluctuation and harmonics when it is connected to the distribution
system.Also,we observed the voltage fluctuation in the distribution system
with distributed generation.This paper analyzes the voltage fluctuation according
to the output fluctuation of distributed generation and presents a study on
D-STATCOM which is a shuntdevice used to compensate powerquality on
distribution lines using real-time simulator.The modeling ofthe distribution
system with distributed generation is modeled by using SIMULINK software.
FULL THESIS
LINK1
ftp://dcollection.skku.edu/dcoll/data/service/000000038/000000038744.pdf

Output Filter Design of Grid-Connected Inverter for High Power Offshore Wind Power System


Output Filter Design of Grid-Connected Inverter for High Power Offshore Wind Power System
 The output filter design for high power grid-connected inverter of offshore wind-turbine has many limitations such as low switching frequency, allowable DC-voltage, and the component volume and weight. In addition, the injected harmonic current into the grid is constrained by various grid connection requirements. This paper compared and weighed with several harmonic regulations and suggested the optimal design procedure of the output filter compliance with the grid code using spectrum analysis of inverter output voltage that contains harmonics. In this paper, the output filter of grid connected inverter for 7MVA offshore wind power system is designed to meet the BDEW harmonic currents limits and the IEEE 519-1992 requirements. The performance of the designed output filter is validated by extensive simulations using Matlab/Simulink.
FULL THESIS
https://www.mediafire.com/?z4tizq8in557vih

quarta-feira, 4 de junho de 2014

PWM RECTIFIER WITH ACTIVE FILTERING PHD THESIS M.SC. MARIUSZ CICHOWLAS WARSAW UNIVERSITY OF TECHNOLOGY


 WARSAW UNIVERSITY OF TECHNOLOGY
FACULTY OF ELECTRICAL ENGINEERING
INSTITUTE OF CONTROL AND INDUSTRIAL ELECTRONICS
PHD. THESIS
M.SC. MARIUSZ CICHOWLAS
PWM RECTIFIER WITH ACTIVE FILTERING
 FULL THESIS HERE:
http://www.isep.pw.edu.pl/icg/pdf/phd/mariusz_cichowlas.pdf