Introduction to Seoul Tech Power Electronics Lab · 2019-03-12 · 88mm. 158mm. 23mm. HV Battery DC/AC Inverter. M. Low-voltage DC/DC Converter

숭실대 세미나

Power Electronics & Fuel Cell Power Conditioning Lab.

Introduction to Seoul Tech Power Electronics Lab

Prof. Sewan Choi, Fellow IEEE

Seoul National University of Science and Technology (Seoul Tech)

Email : [email protected]

Website (Korean) : http://pefcl.seoultech.ac.kr

Website (English) : http://eie.seoultech.ac.kr/en/intro/faculty

Updated on January, 2019

mailto:[email protected]

http://pefcl.seoultech.ac.kr/

http://eie.seoultech.ac.kr/en/intro/faculty


2

Seoul

Geographical Location of Seoul Tech


3Subway Lines in Seoul Metropolitan Area

Nearest subway station on Line 7 (5 minutes walk)

발표자

프레젠테이션 노트

Seoul Tech is on a subway line It takes 40min to dowtown


4

- Founded in 1910

- Total number of students: 15,000

- Undergraduate school: 6 colleges 26 departments

- Graduate school: 7 graduate schools

Overview of Seoul Tech


5Campus Map

Land Size: 510,000 ㎡(124Acres), the 5th largest campus in Seoul

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5th largest campus in seoul


6Campus View

발표자


Complex building for industry-university collaboration Dept of Electrical & Information Eng where PE Lab is located Dormitary for international students


7Why Seoul Tech?

• Low tuition in comparison with private universities (half ~ 2/3)

• Specialized in Engineering Colleges

• Ranked No.1 in the Graduates’ employment rate upon graduation (2013)

• Excellent Scholarship program

• Ranked No.2 among National Universities in Korea (2018)


8Global Network

Philippines MalaysiaIndonesia ThailandVietnam Cambodia

India

JapanChina

TaiwanMongolia

Canada

USA

UK Finland

Czech RepublicGermanyIreland

ItalyPortugalSlovakiaDenmark

SwitzerlandNorway

TurkeyRussia

KazakhstanUzbekistan

FranceSpain

SloveniaThe Netherlands

BelgiumAustria

Lithuania

44 185 8

Saudi Arabia

UAE

Egypt

Australia

New Zealand

Colombia

Brazil

Dominican Republic

Argentina

Country University Institute

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We have a global network all over the world

http://terms.naver.com/entry.nhn?docId=956311&cid=768&categoryId=1857

http://terms.naver.com/entry.nhn?docId=956311&cid=768&categoryId=1857

http://terms.naver.com/entry.nhn?cid=768&docId=1524643&categoryId=2064

http://terms.naver.com/entry.nhn?cid=768&docId=1524643&categoryId=2064


9Guide for Schools

Colleges Graduate Schools

6 Colleges

College of Engineering

College of Information & Communication Engineering

(48 faculty members)

• Electrical & Information Engineering

• Electronic & IT Media Engineering

• Computer Science & Engineering

College of Energy & Biotechnology

College of Art & Design

College of Humanities & Social Sciences

College of Business & Technology

1 General,4 Professional

Graduate School

Professional Graduate School

• Railroad

• Public Policy & Information Technology

• Energy & Environment

• Nano IT Design Fusion

발표자


Electrical & Information Engineering belongs to college of ~


10Global Programs for International Programs

Degree Program

• Undergraduate • Graduate - Master, Combined Master/Ph.D, and Ph.D

Exchange Student Program(ESP)

• For students from the partner universities who wish to study at SeoulTech for 1 or 2 semesters

Visiting Program:Seoul Tech International Season Semester(STISS)

• For partner universities’ students who want to study basic Korean language & culture

Korean Language & Culture Program(KLCP)

• For international students who want to study Koreanlanguage and culture intensively

발표자


In the graduate program,


11On Campus Dormitory

Sunglim Dormitory

• Men : Quad-room (4 person/room) $150/month

• Women : Double-room (2 person/room) $200/month

• Bathroom inside room• Shared kitchen / floor• Shared washing machine

International Dormitory

• Single room ($400/month)

• Double room ($320/month)

• Bathroom inside room

• Kitchen inside room

• Washing machine inside room


12Living @ Seoul Tech

Facilities•• Fitness center• Table tennis room• Café & Cafeteria• Convenient store• Running Track & Athletic Fields

Supports

• ISC(International Student Club)Supporting international students adjusting to life at Seoul Tech

• Airport Pick-up• Cultural Tour• Consulting service


13Seoul Tech Power Electronics Lab

24 graduate students including 7 international students (13 PhD and 11 MS full-time students)

Over 360 papers published in domestic and international journals and conferences

30 papers published in IEEE Transactions on Power Electronics (2010 ~ present)

31 domestic and international patents pending or registered

Over 60 government & industry projects carried out(currently, 8 on-going projects)


14Publications

Patents : 26

Publications : 373

Transactions on Power Electronics

Transactions on Industry Applications

Transactions on Industrial Electronics

SCI Publications: 44

29

4

3

2

2

3

1


15Citations (based on Google Scholar)

Total number of citations : 3668 (Jan. 24, 2019)

19 33 53 72 64103

140195

248 266 283

400 397 416 402365

2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018

h-index = 31

i-10 = 65


16Major research areas

Fuel Cell and Photovoltaic Power Conversion Systems

- High power DC-DC converter(1kW~hundreds of kW)

- Grid-connected Inverter

Power Converters for Electric Vehicles

- DC-DC converter, On Board Charger, Fast Charger

Energy Storage Systems

- Bidirectional DC-DC converter, Hybrid UPE-ESS system

DC Distribution and DC Microgrid

Single-phase/Three-phase Power Factor Correction

발표자


We are mainly working on 4 research areas. These are prototypes we developed for some projects.


17Sponsors for Seoul Tech Power Electronics Lab

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We have a firm collaboration with many companies


18

Type Equipment Specification EA Manufacture

Sources

3P Programmable AC Power Source 4.5kW 1 PACIFIC

Programmable DC Power Source 32kW(0~1000V) 1 REGATRON

Programmable DC Power Source 15kW(0~600V) 1 Sorensen

Programmable DC Power Source 26.6kW(0~80V) 1 MAGNA Power

Loads

AC Electronic Load 3kW 2 California Instrum.

DC Electronic Load 5.4kW, 500V 1 PRODIGIT

DC Electronic Load 3kW, 650V 1 Kikusui

Measurement

Multi-Channel Digital Oscilloscope 8ch, 1GHz 1 LeCroy

Multi-Channel Digital Oscilloscope 8ch, 500MHz 1 Yokogawa

High Function Digital Oscilloscope 4Ch, 500MHz 2 LeCroy

Power Analyzer 3P Volt, Amp, Harmonic Analysis 1 ZIMMER

Power Analyzer Precision efficiency measurement 1 Yokogawa

Scopecorder 8ch/100MHz Scope, 16ch Thermo Couple 1 Yokogawa

High resolution thermal image camera Range: -20 °C to +600 °C 1 Yokogawa

Logic Analyzer 16 channels 1 HP

LCR Meter L,C,R measurement 1 HP

High current probe 150A 6 Yokogawa/LeCroy

High voltage probe 1000V 6 Yokogawa/LeCroy

Softwares

PSIM Version(11.0) 10 Simtech

PADS Version(1.2) 5 Mentor Graphics

PLECS Version(4.0.5) 10 Research Centre

Lab Equipment (amounts to $900,000)

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List of lab equipments that amount to~


19Experimental Set-up


20Lab. Facilities

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Graduate student office, lab for experiments, component warehouse


21Current Lab. Members


22Lab. Members with Alumni


23Extra Activities

발표자


Every winter and summer we go outside for extra activities such as skiing, rafting or drinking


24Project related to electric vehicle (1/2)

Title Company Period

Development of 25kW Bidirectional DC-DC Converter for Rapid Charger Destin Power 2018.7 ~ 2019.6

Development of Next-Generation High-Voltage Supercharger for EVKorean Research

Foundation2017.5 ~ 2020.4

Development of 50kW EV-NEV Combined Modular Rapid Charger World Top Tech. 2014.3 ~ 2016.3

Development of High-Efficiency 50kW Rapid Charger for EV Signet System 2013.2 ~ 2014.6

Developent of Optimum DC-DC Converter for Rapid Charger LS Industries 2012.3 ~ 2012.8

100kW Rapid Charger Power Stack Development LS Industries 2011.6 ~ 2011.12

Title Comapany Period

Development of Bi-directional Charger for V2G EV IT Engineering 2015.12 ~ 2016.5

Development of Integrated Battery Charger for Environmentally Friendly Vehicles with Energy Storage Function

Korean Research Foundation

2014.5 ~ 2017.4

Development of 3.3kW Bi-directional charger for EV with V2G/V2H Function Signet System 2013.2 ~ 2014.6

Development of High Efficiency and High Density DC-DC Converter for Environmentally Friendly Vehicles (HDC,OBC)


2010.5 ~ 2013.4

Fast Charger

On-board Battery Charger


253.3kW Bidirectional Battery Charger for V2G/V2H

Item Specification

Output power 3.3 kW

Grid voltage 110/220 Vac

Battery voltage 250~410 Vdc

THD < 5%

Operation modes

Charging/V2G/ V2H

Development of 3.3kW working prototype

Operating modes : Charging/Vehicle-to-Grid/Vehicle-to-Home

Proposed bidirectional resonant dc-dc converter achieves ZCS turn on & off

Seamless transfer algorithm is realized

Charging efficiency

Mode change(Charging V2H)

[20ms/div]

Vcf [100V/div]

Vg [100V/div]

iLg [20A/div]

Grid Fault Mode Transfer

Discharging efficiency

Grid

Load

Li-ionBattery Bi-directional

DC-DC converterBi-directional

DC-AC Inverter

Vcf

iLg

GridLi-ion

Battery Bi-directionalDC-DC converter

Bi-directionalDC-AC Inverter

Load

Vcf

iLg

GridLi-ion

Battery Bi-directionalDC-DC converter

Bi-directionalDC-AC Inverter

Load

Vcf

iLg

V2G

Charging

V2H

☞ Measured by Yokogawa WT3000


2650kW Fast Charger for Electric Vehicles

ACDC

10kW module #1

ACDC

10kW module #5

AC

DC

DSP

게이트 드라이버

게이트 드라이버

계측 회로

보호회로

모듈 병렬제어 알고리즘

충전 알고리즘

Digital controller

역률 보상 통신 모듈

DC

DC

10kW module

iA iB iC

Vdc+ Vdc-

< 10kW module >

< 50kW Fast charger > 95.1%

97.5%97.6%

98.7%(@4.5kW)

96.2%(@4.5kW)

97.8%(@6kW)

Item Specification

Output power 50kW

Input voltage 3P 380V

Battery voltage 50~500 V

Power factor > 0.99

THD < 5%

Charging method CC-CV

50kW fast charger is consisted of five 10kW modules

Each module consists of AC-DC converter and isolated DC-DC converters

Current sharing control of 5 modules

Proposed hybrid switching technique for the DC-DC converter results in

peak efficiency of 98.7%esults in peak efficiency of 98.7%


27Project related to electric vehicle (2/2)


Development of DC-DC Converters for Fuel Cell Electric VehiclesMinistry of Industry

2017.11 ~ 2021.7

Development of High Efficiency and High Density DC-DC Converter for Environmentally Friendly Vehicles (HDC,OBC)


2010.5 ~ 2013.4

Development of Topology and Control Technology for HDC of Hybrid Vehicles ADT 2006.12 ~ 2009.11


Development of GaN-based High-Frequency, High Power-Density LDC Hyundai Motor 2018.7 ~ 2019.6

Development of 3.2kW Class DC-DC Converter for EV LG InnoTek 2017.10 ~ 2018.8

Bidirectional DC-DC Converter for Power System Samsung Electric 2013.3 ~ 2013.10

Development of 5kW bidirectional LDC for Military Tactical Vehicle ADT 2012.3 ~ 2012.9

Development of Bi-directional DC-DC Converter for Fuel Cell Vehicle Hyundai Motor 2007.6 ~ 2008.4

Bidirectional DC-DC Converter for Fuel Cell Vehicle Auxiliary Power Supply Hyundai Motor 2006.4 ~ 2006.12

LDC Power Circuit Topology for Hybrid Vehicles Hyundai Motor 2005.12 ~ 2006.5

Auxiliary Power Supply for Fuel Cell/ Hybrid Vehicle Hyundai Motor 2004.1 ~ 2004.10

High Voltage DC-DC Converter

Low Voltage DC-DC Converter


28Development of GaN-based High-Frequency, High Power-Density LDC (Ongoing)

Item Specifications

Output power 1.8kW

Dimension (W*D*H) 150*80*25mm

Input voltage (HV) 200~310 V

Output voltage (LV) Nominal 13.9V

Cooling system Liquid (65ºC, 8LPM)

<Planar transformer 3D model> <Core simulation results>

Vpri+

Vpri-

Vsec+

Vsec-

<1.8kW LDC 1st prototype 3D view>

88mm

158mm

23mm

HVBattery

DC/ACInverter M

Low-voltageDC/DC

Converter

LVBattery

12V-15.1V

200V-310V

14VLoad

Supported by : Hyundai Motor

Period : 2018-7 ~ 2019-6

Researcher: 김상진, 김형진, Adhis, 김규영, 김병우

Development contents:

Topology selection for high power density (6kW/L)

Development of GaN driver circuit for high

switching frequency (>700kHz)

Development of high frequency planar transformer

Structure design and stack fabrication considering

heat dissipation

< EV converter system diagram >


29Development of DC-DC Converters for Fuel Cell Electric Vehicles (Ongoing)

Fuel Cell Stack

Battery

MDC/ACInverter

DC LinkUnidirectional

DC/DCConverter

BidirectionalDC/DC

Converter

Supported by : Ministry of Industry

Period : 2017-11 ~ 2021-7

Researcher : 정현주, Hai, 김선주, 이동한


Development of 114kW boost converter for fuel-cell

Development of 40kW bi-directional converter for battery

Application of SiC device and development of soft switching

technology

Item Specifications

Fuel-cell voltage 195~400V

Battery voltage > 200V

DC Link voltage 800V

Efficiency 96% peak

Power density 8.2 kW/L

Weight 18kg

< Power Net of Fuel Cell Electric Vehicles>

[1] H. N. tran, A. M. Naradhipa, S. Kim, A. Tausif and S. Choi “Fully Soft-Switched PWM DC-DC Converter Using Active-Snubber-Cells,” 2018 IPEC - IEEE ECCE ASIA, Niigata, 2018

< Si-based PCU > < SiC-based PCU >


30Development of 3.2kW Class DC-DC Converter for EV(Recently finished)

Supported by : LG InnoTek

Period : 2017-10 ~ 2018-8

Researcher : 김병우, 김강산, Adhis, 조우식


3.2kW DC/DC converter circuit optimal design

Converter modeling and controller design

NXP MCU (MPC5741) digital control board design

< Switch voltage & current >

Item Specification

Output power 3.2kW

Input voltage (HV) 250~450 V

Output voltage (LV) Nominal 14V

Efficiency 94% peak

< 3.2kW prototype >

< Load regulation >

< ISOP ACF Converter >

< Line regulation >


31DC-DC Converter for Mild Hybrid Electric Vehicles

86

88

90

92

94

96

98

100

0 300 600 900 1200 1500 1800

효율(%)

부하(W)

V_high = 48V

Peak Efficiency : 96% Peak Efficiency : 96.3% Peak Efficiency : 97% 15.2V

12V

10.5V


ILow [10A/div]

VHigh [10V/div]

VLow [10V/div]

ILow 충전(22A) ILow 방전(18A)

VHigh 전압 강하

Supported by : Samsung Electro-Mechanics

Development of 1.8 kW working prototype

Bidirectional DC-DC converter for 12V-48V power nets

Development of Digital Control Board using Automotive MCU

180A layout and thermal design

High Efficiency over wide load range

ILow [1A/div]

ΔILow = 4.3A

IL3 [10A/div]IL1 [10A/div]

[5μs/div]

IL2 [10A/div]

Effici

ency

(%)

Output Power(W)

Cur

rent

sens

or

Switch

Heat sink

Inductor


32High Step-up DC-DC Converter for 1.2kW, 16V Fuel Cells

88

90

92

94

96

98

0 200 400 600 800 1000 1200

Eff

icie

ncy

[%]

Output Power [W]

DC-DC 컨버터부 측정효율

전력변환장치측정효율

(제어부전원포함)

92.7% @450W 91.4% @1170W

Supported by : Hyosung Heavy Industries

Development of DC-DC converter prototype for production

Patented high step-up converter applied : 16V 380V

ZVS turn ON of switches in all load range

Fuel Cell16 ~ 26V

DC Link380V

DC-DC Converter

96.3% @300W93.7%

@1140W

☞ Measured by Yokogawa WT3000Inverter

Grid

High Step-up Converter

DC

AC

DC

DC

Fuel Cell

DC-DC converter

DC-DC converter + Inverter

H. Kim, C. Yoon, S. Choi, “ An Improved Current-fed ZVS Isolated Boost Converter for Fuel Cell Applications“, IEEE Trans. onPower Electronics, Sep. 2010

C. Park, S. Choi, “Quasi-Resonant Boost-Half-Bridge Converter with Reduced Turn-Off Switching Losses for 16 V Fuel CellApplication”, IEEE Trans. on Power Electronics, Nov. 2013


33DC-DC Converter for Fuel Cell Vehicles

Development of 2kW working prototype

Proposed bidirectional isolated resonant dc-dc converter achieves ZCS turn on & off

Theoretically zero output filter capacitance by resonant interleaved operation


Bi-directional Isolated Converter

12V Battery

Inverter Motor

12V Loads

VH (200~400V)

Fuel Cell

DC

AC

DC

DC

M3~

VL (11~16V)

iLr1

t0 t1 t2

iLr2

DPhase10 0.5Ts Ts

1-DPhase1

iL1

iL2

iL

t3 t4 t5 t6 t7 t8

π/21-DPhase2 DPhase2DPhase2

Ripple free

95.9%

[ Interleaved output current ] [ Ripple current of output capacitor ]

IL1

IL2IL

D. Moon, S. Choi, “New Interleaved Current-fed Resonant Converter with Significantly Reduced High Current Side Output Filterfor EV and HEV applications”, IEEE Trans. on Power Electronics, Aug. 2015


34Project related to renewable energy and energy storage systems


Development of High Efficiency Isolated PV String Power Optimizer Dass Tech 2019.1 ~ 2019.10

Droop Control of PV Inverters with Reduction of Common Mode Voltage LG Electronics 2018.7 ~ 2019.7

Development of Multi-input Module Type PCS for Renewable Energy Grida Energy 2017.9 ~ 2018.7

Development of 25kW Ultra Capacitor Charger Destin Power 2016.7 ~2017.2

Development of DC-DC Converter for DC Nanogrid Destin Power 2016.2 ~2016.12

Development of High-Voltage Bi-directional Converter Technology LG Electronics 2015.4 ~2016.3

Development of 10kW PCS for ESS Hansol Tech. 2014.10 ~ 2015.3

Development of Hybrid Energy Storage System for Demand Management with Emergency Power Function

Industry/International Communication

2014.06 ~ 2017.05

Development of High Efficiency Bi-directional DC-DC Converter for BESS Samsung SDI 2013.10 ~ 2014.03

Algorithm Development and Verification of PCS for MW Grid-type ESS LS Industries 2013.10 ~ 2014.03

Development of High Efficiency and High Reliability Smart Home Energy Server with Emergency Power Function

EESYS 2012.06 ~ 2014.05

Development of High Efficiency Bi-directional DC-DC Converter Samsung SDI 2011.05 ~ 2011.11

Development of High Efficiency High Frequency Isolated Bi-directional DC-DC Converter Technology for ESS

LG Electronics 2011.05 ~ 2011.10


35Development of Hybrid ESS for Demand Management with Emergency Power Function

Supported by : Ministry of Commerce, Industry and Energy

Period : 2014-6 ~ 2017-5


Development of 250kW integrated ESS + UPS

Development of integrated control and

rapid mode switching algorithm

TMS320F28377D integrated controller-------

Development of 3-level inverter technology

5kW prototype and testing

Item Specifications

Output power 250kW

Current THD 3% max

Mode switching time <4ms

Voltage fluctuation @ mode switching

<10%

Efficiency (round trip) >90%

<250kW prototype>

<5kW prototype>

TMS320F28377DControl Board

Bi-directional Interleaved DC-DC Converter

3-level AC-DCConverter

3-level DC-AC Inverter

DC

DC

DC

AC

AC

DC

VFDLoad

VFILoad

Load

DC

DC

DC

AC

AC

DC

VFDLoad

VFILoad

Load

Reserved power

Demand management

Li-ionBattery

HybridESS Load

VFI load

Grid

VFD load

PCS

Emergency power supply

Demand management

<Configuration of Hybrid ESS>

<Battery charging mode>

<Emergency mode>


3612kW Isolated Bidirectional Converter for Battery Formation

Item Specification

Output power 12 kW

High side voltage 400 V

Low side voltage 12 V (max 1000A)

Battery current ripple

< ±5%

Switching frequency

32kHz

VSH,A1VSH,A2

Ipri1

[950A]

VSL,A2

Ipri1

VSL,A1

[950A]

[ High voltage side switch ][Low voltage side switch ]

Supported by : Samsung SDI

Development of 12kW working prototype

Bidirectional resonant converter for battery formation

High frequency transformer with interleaved winding

Low voltage high current power circuit and system layout design

88

90

92

94

96

98

0 2 4 6 8 10 12 14

효율

[%]

출력전력 [kW]

충전모드

방전모드

89.5%

90.5%

96.5%96.3%


Discharging

InverterGrid

Isolated Converter

DC

AC

DC

DC

Battery

DC

DC

Non-isolated Converter

VH(400V)VL(12V)VBat(5V~12V)

Power flow


37Bidirectional DC-DC Converter for ESS

Supported by : Samsung SDI

Development of Bidirectional DC-DC converter for mass production

Patented bidirectional DC-DC converter applied to ESS

ZCS turn ON & OFF of switches

Peak efficiency of 96%

Switch Voltage & Current

ZCS turn ON & OFF

Measured Efficiency

Peak Efficiency 96.1%95% @2kW

BidirectionalDC-DC Converter

ESS Battery

Inverter

Grid

MPPT Converter

DC

AC

DC

DC

DC

DCSolar Panel


[ DC inductor ] [ Transformer ]


383kW Hybrid ESS for Residential Use

95.54%

94.74%


Bidirectional converter + InverterPV converter + Inverter

95.77%96%

Hybrid generation system: Integrated PV PCS+ESS+UPS

Isolated bidirectional DC-DC converter for battery charging

LLC converter for PV MPPT

Seamless mode change algorithm implemented

Battery charging

Battery Current

Grid Current

Battery discharging

PV generation

Grid Voltage

PV Voltage PV Current

Grid CurrentGrid Voltage

Item Specification

Output power 3 kW

Grid voltage Single phase 220 Vac

Battery voltage 128 ~ 162 Vdc

PV voltage 150 ~ 450 Vdc

THD < 5%

Main functions CC-CV charging, seamless transfer

0

0

0

Battery Current Grid Current

Grid VoltageLi-ion

Battery Bi-directionalInverter

Grid

Bi-directionalDC/DC Converter

PV Array DC/DC Converter

CriticalLoad


39

Supported by : Destin Power

20kW Bidirectional Converter for DC Nano-grid

Peak efficiency of 98.9% using Full SiC IPM

Implementation of DC Droop Control

DSP control using TMS 320F28377D

20kW Bidirectional DC-DC converter for DC Nano-grid

380VAC

750VDC

48VDC24VDC

DCLoad

Battery

DCLoad

DCLoad

DCLoad

DC/DC

DC/DC #1

225V~830V, 120kW 225V~830V, 80kW

DC/DC #4

DC/DC #1

DC/DC #6

PV

MPPT

DC/DC #2

DC/DC #2

750VDC Droop Control

AC/DC

Control target

PV power < DC load: Power flow

PV power > DC load: Power flow

< 20kW Prototype>

Vbat Vbus

L1

Cbus

iL1

Cbat

L2iL2

iL3L3

S1 S3

S2 S4

S5

S6

Clink

225V~830V 750V

4k 7k 9k 12k 14k225 320 420 520 600

Po [W]Vbat [V]

Eff

icie

ncy

[%]

99 98.9%100

9897969594939291

97.6%

Hybrid SiC IPMFull SiC IPM


< DC nano-grid system>

< Proposed bidirectional converter>


40

Development of core technologies of PCS for MCFC generation

Interleaved DC-DC converter design and current sharing control

Inverter control algorithm for Grid-tie and Stand alone modes

Islanding detection and seamless mode transfer

Reactive power control and LVRT

Master-slave control of parallel inverters

3 Phase PWM Inverter

6 Phase Interleaved Boost Converter

Load Grid300kWMCFC

[Fuel Cell Power Conversion System]

Power Conversion System for Megawatt MCFC Generation

DC-DCConverter

DC-ACInverter

Lo

Lo

Lo

Lo

300kWMCFC

[Megawatt Fuel Cell Power Plant]

Master current Slave current

Load voltage


41

- Award for contribution to smart grid technology, Ministry of Trade, Industry and Energy, 2012

- 1st Prize Paper Award, IEEE Conference on Power Engineering and Renewable Energy, 2016

- KIPE Best Journal Paper Awards in 2004, 2008, 2014, 2015

- KOFST Best Paper Award, 2009

- KIPE Outstanding Technical Achievement Award, 2003

- KIPE Outstanding Academic Achievement Award, 2002

Received at International competition sponsored by U.S. Department of Energy and IEEE PELS

- 1st place, 2003 Future Energy Challenge (Topic: Fuel cell inverter)

- 2nd place, 2005 Future Energy Challenge (Topic: Grid-connected inverter)

- 2nd place, 2011 Future Energy Challenge (Topic: Battery charger)

Awards

www.energychallenge.org !!!

http://www.energychallenge.org/


42

Sponsor : US DoE and IEEE

Topic : Fuel Cell Inverter

Participants

► Seoul Tech

- Grand Prize($30,000)

► Virginia Tech

- Presentation Award($5,000)

► Texas A&M University

► University of Wisconsin

► West Virginia University

► Michigan State University

► Ohio State University

► University of Missouri, Rolla

► Colorado School of Mines

► Drexel University

► University of Akron

► University of Central Florida

2003 Future Energy Challenge Competition

DSP control

Soft-switching achieved

Design of high frequency transformer

Packaging and system integration


43

Sponsor : US DoE and IEEE

Topic : Utility Interactive Inverter

Participants

► Monash University (Austraila) --1st Place

► Seoul Tech (Korea) ------------- 2nd Place

► University of Illinois (USA) ----- 3rd Place

► University of Wisconsin (USA)

► Texas A&M University (USA)

► Aachen University (Germany)

► Michigan State University (Germany)

► University of Central Florida (Germany)

► Federal Univ of Mato Grosso do Sul

(Brazil)

► Bangladesh University (Bangladesh)

► Federal University (Brazil)

► Krishna Institute (India)

► Memorial University (Canada)

► Nanjing University (China)

► State University of Campinas (Brazil)


Grid tie & island modes of operation

Automatic mode transfer

LCL filter design

DSP control


44

Sponsor : IEEE Power Electronics Society

Topic : Battery Charger for Renewable energy & Electric vehicles

Participants

► Virginia Tech (USA) ------------------- 1st Place

► Seoul Tech (Korea) ------------------- 2nd Place

► University of Kassel (Germany) ---- - 3rd Place

► University of Connecticut (USA)

► National Taiwan Univ of Science and Tech (Taiwan)

► Huazhong Univ of Science & Technology (China)

► Indian Institute of Technology (India)


PFCSRC

Fixed-frequency SRCBoost PFC

Io

iL

VBatVin S1

S2

S3

D1 D3

D2 D4

D6

D7

D5

Cr1

Cr2

Cf

Cd2

1 : n

CBUS Lr

Cd1

Lf

3kW Battery charger for electric vehicles

Optimized design of Isolated DC-DC converter

Soft-switching achieved in the whole operating range

CC-CV, CP-CV battery charge

CAN communication and DSP control

92.7% @3000W

94.6% @1000W



45International Journal Publication(1/4)

S. Park, M. Kwon, S. Choi, “Reactive Power P&O Anti-islanding Method for Grid Connected Inverter with Critical Load", IEEE Transactions on Power Electronics, Jan. 2019

M. Kwon, S. Choi, " Control Scheme for Autonomous and Seamless Mode Switching of Bidirectional DC-DC Converters in a DC Microgrid", IEEE Transactions on Power Electronics, June 2018

H. Jeong, M. Kwon, S. Choi, "Analysis, Design, and Implementation of a High Gain Soft-switching Bidirectional DC-DC Converter with PPS Control ", IEEE Transactions on Power Electronics, June 2018

S. Kim, M. Kwon, S. Choi, " Operation and control strategy of a New hybrid ESS-UPS system", IEEE Transactions on Power Electronics, IEEE Transactions on Power Electronics, June 2018

M. Kim, H. Jeong, B. Han, S. Choi, " New Parallel Loaded Resonant Converter with Wide Output Voltage Range", IEEE Transactions on Power Electronics, April 2018.

J. Sandoval, H. Krishnamoorthy, P. Enjeti, S. Choi, " Reduced Active Switch Front End Multi-Pulse Rectifier with Medium Frequency Transformer Isolation", IEEE Transactions on Power Electronics, Oct. 2017.

M. Kwon, S. Choi, " An Electrolytic Capacitor-less Bi-directional EV Charger for V2G and V2H Applications", IEEE Transactions on Power Electronics, Sep. 2017.

T. Kang, S. Choi, A. Morsy, P. Enjeti, " Series Voltage Regulator for a Distribution Transformer to Compensate Voltage Sag/Swell", IEEE Transactions on Industrial Electronics, June 2017.

M. Kwon, J. Park, S. Choi, "A Bidirectional Three-Phase Push–Pull Converter With Dual Asymmetrical PWM Method ", IEEE Transactions on Power Electronics, Mar. 2016.

M. Kwon, J. Park, S. Choi, "A Bidirectional Three-Phase Push–Pull Converter With Dual Asymmetrical PWM Method ", IEEE Transactions on Power Electronics, Mar. 2016.

M. Kim, S. Choi, "A Fully Soft-Switched Single Switch Isolated DC-DC Converter", IEEE Transactions on Power Electronics, Sep. 2015.

D. Moon, J. Park, S. Choi, "New Interleaved Current-fed Resonant Converter with Significantly Reduced High Current Side Output Filter for EV and HEV applications", IEEE Transactions on Power Electronics, Aug. 2015.


46International Journal Publication(2/4)

J. Park, S. Choi, "Design and Control of a Bidirectional Resonant DC-DC Converter for Automotive Engine/Battery Hybrid Power Generators", IEEE Transactions on Power Electronics, July 2014.

M. Kwon, S. Oh, S. Choi, "High Gain Soft-switching Bidirectional DC-DC Converters for Eco-friendly Vehicles", IEEE Transactions on Power Electronics, Apr. 2014.

C. Park, S. Choi, "Quasi-Resonant Boost-Half-Bridge Converter with Reduced Turn-Off Switching Losses for 16V Fuel Cell Application", IEEE Transactions on Power Electronics, Nov. 2013.

S. Lee, P. Kim, S. Choi, "High Step-up Soft-switched Converters Using Voltage Multiplier Cells", IEEE Transactions on Power Electronics, July. 2013.

S. Yoon, H. Oh, S. Choi, "Controller Design and Implementation of Indirect Current Control Based Utility-Interactive Inverter System", IEEE Transactions on Power Electronics, Jan. 2013.

Y. Park, B. Jung, S. Choi, "Nonisolated ZVZCS Resonant PWM DC–DC Converter for High Step-Up and High-Power Applications", IEEE Transactions on Power Electronics, Aug. 2012.

J. Kwon, S. Yoon, S. Choi, "Indirect Current Control for Seamless Transfer of Three-Phase Utility Interactive Inverters", IEEE Transactions on Power Electronics, Feb. 2012.

S.H. Kim, W. J. Choi, K. B. Lee, S. W. Choi, "Advanced Dynamic Simulation of Supercapacitors Considering Parameter Variation and Self-Discharge", IEEE Transactions on Power Electronics, Nov. 2011.

S. Park, Y. Park, S. Choi, W. Choi, K. Lee, "Soft-switched Interleaved Boost Converters for High Step-up and High Power Applications", IEEE Transactions on Power Electronics, Oct 2011.

S. Lee, J. Park, S. Choi, "A Three-Phase Current-Fed Push-Pull DC-DC Converter with Active Clamp for Fuel Cell Applications", IEEE Transactions on Power Electronics, Aug 2011.

C. Yoon, J. Kim, S. Choi, "Multi-Phase DC-DC Converters using a Boost-Half-Bridge Cell for High Voltage and High Power Applications", IEEE Transactions on Power Electronics, Feb 2011.

S. Choi, V.G. Agelidis, J. Yang, D. Coutellier, P. Marabeas, "Analysis, Design and Experimental Results of a Floating-Output Interleaved-Input Boost-Derived DC-DC High-Gain Transformer-less Converter", IET Power Electronics, Jan 2011


47

H. Kim, C. Yoon, S. Choi, "An Improved Current-fed ZVS Isolated Boost Converter for Fuel Cell Applications", IEEE Transactions on Power Electronics, Sep 2010.

H. Jeong, K. Lee, S. Choi, W. Choi, "Performance Improvement of LCL-Filter-Based Grid-Connected Inverters Using PQR Power Transformation", IEEE Transactions on Power Electronics, May 2010.

S. Park, S. Choi, "Soft-Switched CCM Boost Converters With High Voltage Gain for High-Power Applications", IEEE Transactions on Power Electronics, May 2010.

H. Kim, C. Yoon, S. Choi, "A Three-Phase Zero-Voltage and Zero-Current Switching DC-DC Converter for Fuel Cell Applications", IEEE Transactions on Power Electronics, Feb 2010.

S. Kim, W. Choi, S. Choi, K. Lee, "Combined Dithered Sigma-Delta Modulation based Random PWM Switching Scheme", Journal of Power Electronics, Oct 2009.

S. Choi, Y. Bae, "A New Unity Power Factor Rectifier System using an Active Waveshaping Technique", Journal of Power Electronics, March 2009.

H. Kim, T. Yu, S. Choi, "Indirect Current Control Algorithm for Utility Interactive Inverters in Distributed Generation Systems", IEEE Transactions on Power Electronics, May 2008.

S. Jung, Y. Bae, S. Choi, H. Kim, "A Low Cost Utility Interactive Inverter for Residential Fuel Cell Generation", IEEE Transactions on Power Electronics, Nov. 2007.

S. Choi, M. Jang, "Analysis and Control of a Single-Phase-Inverter-Zigzag- Transformer Hybrid Neutral Current Suppressor in Three-Phase Four-Wire Systems", IEEE Transactions on Industrial Electronics, Aug. 2007.

J. Lee, J. Jo, S. Choi, S. Han, "A 10KW SOFC Low-Voltage Battery Hybrid Power Conditioning System for Residential Use", IEEE Transactions on Energy Conversion, June 2006.

D. Choi, B. Lee, S. Choi, C. Won, D. Yoo, "A Novel Power Conversion Circuit for Cost Effective Battery-Fuel Cell Hybrid System", Journal of Power Sources, Dec. 2005.

S. Choi, "A Three-Phase Unity Power Factor Diode Rectifier with Active Input Current Shaping", IEEE Transactions on Industrial Electronics, Dec. 2005.

International Journal Publication(3/4)


48

S. Choi, C. Won, G. Kim, "A New Three-Phase Harmonic-Free Rectification Scheme Based on Zero-Sequence Current Injection", IEEE Transactions on Industry Applications, March/April 2005.

S. Choi, M. Jang, "A Reduced-Rating Hybrid Filter to Suppress Neutral Current Harmonics in Three-Phase Four-Wire Systems", IEEE Transactions on Industrial Electronics, Aug. 2004.

S. Choi, C. Won, Y. Kim, C. Kim, " New high-pulse conversion techniques for HVDC transmission systems", IEE Proceedings-Generation, Transmission and Distribution, May 2003.

S. Choi, "New Pulse Multiplication Technique Based on Six-Pulse Thyristor Converters for High Power Applications", IEEE Transactions on Industry Applications, Jan./Feb. 2002.

S. Choi, B. Lee, P. Enjeti, "New 24-Pulse Diode Rectifier Systems for Utility Interface of High Power AC Motor Drives", IEEE Transactions on Industry Applications, March/April 1997.

S. Choi, P. Enjeti, H. Lee, I. Pitel, "A New Active Interphase Reactor for 12-Pulse Rectifiers Provides Clean Power Utility Interface", IEEE Transactions on Industry Applications, Nov./Dec. 1996.

S. Choi, P. Enjeti, I. Pitel, "New Polyphase Transformer Arrangements with Reduced kVA Capacities for Harmonic Current Reduction in Rectifier Type Utility Interface", IEEE Transactions on Power Electronics, Sep. 1996.

International Journal Publication(4/4)


49Sewan Choi

Education B.S. in Electronic Engineering, Inha University in 1985 M.S. in Electrical Engineering, Texas A&M University in 1992 Ph.D. in Electrical Engineering, Texas A&M University in 1995

Experience1985 - 1990, Research Engineer, Daewoo Heavy Industries 1996 - 1997, Principal Research Engineer, Samsung Electro-Mechanics Co 1997 - present, Professor, Dept of Electrical & Information Eng, Seoul Nat’l Univ. of Science and Technology

Activities2004 - present, Executive Board Member, Vice President(2017-2018), Korean Institute of Power Electronics 2004 - 2008, Consulting Professor, Hyundai Motor Company2006 - present, Associate Editor, IEEE Transactions on Power Electronics2010 - 2015, Associate Editor, IEEE Transactions on Industry Applications2015 - present, Associate Editor, IEEE Journal of Emerging & Selected Topics in Power Electronics2019 - present, Seoul Chapter Chair, IEEE Power Electronics Society2019 - present, Fellow Member, IEEE

Research interestsPower conversion technologies for renewable energy systems and energy storage systems DC-DC converters and battery chargers for electric vehicles


50

Full financial support for tuition and living expense is available to all admitted Ph.D

or Master combined Ph.D students.

For information on the financial support, please contact directly to Prof. Sewan Choi

at [email protected]

Financial Support

mailto:[email protected]

Documents

Introduction to Seoul Tech Power Electronics Lab · 2019-03-12 · 88mm. 158mm. 23mm. HV Battery DC/AC Inverter. M. Low-voltage DC/DC Converter