Research

Control Algorithm of Three-phase Solid-State Transformer (2022-Present)

Three-phase SST control algorithm development (2 modules per one phase)
Module topology : Full-bridge + TAB converter
AC/DC modular converter control algorithm + TAB control algorithm
TI MCU-based control system design + EtherCAT communication link implementation
Dong-Uk Kim, Jun Hee Yoon, Sungmin Kim

Solid-State Transformer for High Speed Train (2021-Present)

SST topology design for high speed train (25kVrms / 2800Vdc / 4MW)
Modular SST control structure design and implementation
Dong-Uk Kim, Jun Hee Yoon, Seung Ho Lee, Sungmin Kim

Grid-Connected Parallel Inverter Control for Flexibility (2021-Present)

Grid-connected AC/DC converter control (parallel operation)
Droop control / High power density / Flexible management
Paul Jang, Sungmin Kim

MVAC/Multi-LVDC Converter Module Design and Control (2021)

MVAC/Multi-LVDC Converter module (22.9kVac / 750Vdc(Multi-output) / 1MVA)
Triple Active Bridge (TAB) converter module design and control
Dong-Uk Kim, Sungmin Kim

High Efficient Control of DAB Converter in light load (2020)

DAB PWM method for high efficiency in light load
Seung Ho Lee, Sungmin Kim

LVRT/HVRT Ride-Through Test Procedure Research (2019-Present)

LVRT/HVRT test procedure research
LVRT/HVRT test model (Wind turbine / PSCAD) design
Seunghyuk Baek, Sungmin Kim

AC UPS Control & LC/LCL Filter Design (2020)

LC/LCL filter design based on converter output voltage harmonics
AC voltage/current control (positive/negative/5,7,11,13th harmonics)
Dong Yeop Han, Seunghyuk Baek, Sungmin Kim

MVDC Real-Time Test-bed System Design (2020)

HVAC-HVDC-MVDC-LVDC System Design and Converter Topology Research
HVDC/MVDC, MVAC/MVDC, MVDC/LVDC Converter Control Algorithm
EtherCAT / MCU based real-time controller implementation
RTDS based HILS implementation
Junsik Hwang, Sungmin Kim

Circuit for Fast Blowing Fuse in DC System (2020)

Very fast blowing fuse without large short-fault current in DC line
Blowing fuse within 600us
Seung Ho Lee, Dong-Uk Kim, Paul Jang, Sungmin Kim

Modular DC Circuit Breaker (2020)

Scalable DC circuit breaker for medium voltage DC grid
3 prototype hybrid DC CB modules
500V, 300A Verification
Dong-Uk Kim, Sungmin Kim

Anti-Islanding Detection Algorithm (2019)

Anti-Islanding detection method using phase-shifted feed-forward voltage
Fast detection, Better power quality, Simple implementation
Dong-Uk Kim, Sungmin Kim

Speed Controller Transition Method for I/F Operation and Sensorless Operation of PMSM (2019)

Speed controller transition method development
I/F Operation & Sensorless Operation of PMSM
Sungmin Kim

Three-Phase Solid-State Transformer Control (2018-2020)

Modular three-phase AC/DC/AC SST Design
Power flow control / Module DC capacitor voltage balancing control
Seunghyuk Baek, Junsik Hwang, Paul Jang, Sungmin Kim

Hybrid DC Circuit Breaker (2018-2020)

Hybrid DC circuit breaker: PMA + Vacuum Interrupter
Test voltage: 500V / Peak current: 300A / Opening time: <9ms
Dong-Uk Kim, Sungmin Kim

SST Module Converter Topology Design and Control for MV/LV (2018)

Converter module design for isolated MV/LV SST
Module power: 200kW / Input voltage: 2300Vrms / Output voltage: 750Vdc
Controller design (H/W, S/W)
Youngjin Oh, Junsik Hwang, Sungmin Kim

1.8kW PFC Converter Design (2018)

Boost PFC Converter Design
Size: : 150*190*80mm / Input voltage range: 85~260 Vrms / Output voltage: 385Vdc
Efficiency: 97.85% (230Vrms, 1.8kW)
Dong-Uk Kim, Paul Jang, Sungmin Kim

Synchronous Machine Commissioning Process Design (2017)

Mechanical parameter identification in the commissioning process
Identification of Moment of Inertia, Viscous friction coefficient, Coulomb friction coefficient
Sungmin Kim

Single-phase Solid-State Transformer Design and Control (2017)

Control architecture research for SST
Single-phase SST module topology design and verification
Sungmin Kim

Saturated Model Identification of Induction Motor (2017)

Identification of saturated impedance model of induction motor
Signal injection method for identification in the stationary condition
Sungmin Kim

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