Ph.D. Aalborg University (Denmark)
M.S. 아주대학교
B.S. 아주대학교
[33] U. M. Choi and J. S. Lee, “Single-Phase Five-Level IT-Type NPC Inverter with Improved Efficiency and Reliability in Photovoltaic Systems,” IEEE Journal of Emerging and Selected Topics in Power Electronics, 2021, in press.
[32] J. S. Lee and *U. M. Choi, “Velocity Profile based Evaluation and Improvements of Lifetime of Power Devices in Railway Propulsion Inverters,” IEEE Journal of Emerging and Selected Topics in Power Electronics, 2021, in press
[31] U. M. Choi, “Study on Effect of Installation Location on Lifetime of PV Inverter and DC-to-AC Ratio," IEEE Access, vol. 8, pp. 86003-86011, 2020.
[30] U. M. Choi, I. Vernica, D. Zhou, and F. Blaabjerg, “Comparative evaluation of reliability assessment methods of power modules in motor drive inverter,” Microelectronics Reliability, vols. 114, 113730, Nov. 2020.
[29] I. Vernica, *U. M. Choi, H. Wang, and F. Blaabjerg, “Wear-out failure of an IGBT module in motor drives due to uneven thermal impedance of power semiconductor devices,” Microelectronics Reliability, vols. 114, 113800, Nov. 2020.
[28] U. M. Choi and J. S. Lee, “Comparative Evaluation of Lifetime of Three-Level Inverters in Grid-Connected Photovoltaic Systems,” Energies, vol. 13, no. 5, 2020.
[27] U. M. Choi, S. Jørgensen, and F. Blaabjerg, “Impact of Cooling System Capacity on Lifetime of Power Module in Adjustable Speed Drives,” IEEE Emerging and Selected Topics on Power Electronics, vol. 7, no. 3, pp. 1768-1776. Sept. 2019.
[26] U. M. Choi, I. Vernica, and F. Blaabjerg, “Effect of Asymmetric Layout of IGBT Modules on Reliability of Motor Drive Inverters,” IEEE Trans. on Power Electronics, vol. 34, no. 2, pp. 1765-1772. Feb. 2019.
[25] U. M. Choi, J. S. Lee and F. Blaabjerg, “Effercts of Power Cycling Tests Condition and Test Strategy on Lifetime Estimation of Power Modules in Power Electronic Systems,” Microelectronics Reliability, vols. 100-101, Sep. 2019.
[24] J. S. Lee and *U. M. Choi, “Comparison of Heat-Pipe Cooling System Design Processes in Railway Propulsion Inverter Considering Power Module Reliability,” Energies, vol. 12, no. 24, Dec. 2019.
[23] K. Ma, U. M. Choi, and F. Blaabjerg, “Prediction and Validation of Cumulative Distribution Function for Power Semiconductor Devices with Mission Profiles in Motor Drive Application, IEEE Trans. on Power Electronics, vol. 33, no. 11, pp. 9843-9853. Nov. 2018.
[22] U. M. Choi, S. Jørgensen, F. Iannuzzo, and F. Blaabjerg, "Power cycling test of transfer molded IGBT modules by advanced power cycler under different junction temperature swings," Microelectronics Reliability, vols. 88-90, pp. 788-794. Sep. 2018.
[21] U. M. Choi, and F. Blaabjerg, “Separation of Wear-out Failure Modes of IGBT Modules in Grid-Connected Inverter Systems,” IEEE Trans. on Power Electronics, vol. 33, no. 7, pp. 6217-6223. July 2018.
[20] U. M. Choi, K. Ma and F. Blaabjerg, “Validation of Lifetime Prediction of IGBT Modules Based on Linear Damage Accumulation by Means of Superimposed Power Cycling Tests,” IEEE Trans. on Industrial Electronics, vol. 65, no. 4, pp. 3520-3529. Apr. 2018.
[19] U. M. Choi, F. Blaabjerg, and S. Jørgensen, “Power Cycling Test Methods for Reliability Assessment of Power Device Modules in respect to Temperature Stress,” IEEE Trans. on Power Electronics, vol. 33, no. 3, pp. 2531-2551. Mar. 2018.
[18] U. M. Choi, F. Blaabjerg, S. Munk-Nielsen, S. Jørgensen and B. Rannestad, “Reliability Improvement of Power Converters by Means of Condition Monitoring of IGBT Modules,” IEEE Trans. on Power Electronics, vol. 32, no. 10, pp. 7990-7997. Oct. 2017.
[17] U. M. Choi, F. Blaabjerg and F. Iannuzzo, “Advanced Power Cycler with Intelligent Monitoring Strategy of IGBT Module Under Test,” Microelectronics Reliability, vols. 76-77, pp. 522-526, Sep. 2017.
[16] U. M. Choi, F. Blaabjerg, and S. Jørgensen, “Study on Effect of Junction Temperature Swing Duration on Lifetime of Transfer Molded Power IGBT Modules,” IEEE Transactions on Power Electronics, vol. 32, no. 8, pp. 7990-7997. Aug. 2017.
[15] U. M. Choi, S. Jørgensen and F. Blaabjerg, “Advanced Accelerated Power Cycling Test for Reliability Investigation of Power Device Modules,” IEEE Transactions on Power Electronics, vol. 31, no. 12, pp. 8371-8386. Dec. 2016.
[14] U. M. Choi, J. S. Lee, F. Blaabjerg, and K. B. Lee, “Open-Circuit Fault Diagnosis and Fault-Tolerant Control for a Grid-Connected NPC Inverter,” IEEE Transactions on Power Electronics, vol. 31, no. 10, pp. 7234-7247. Oct. 2016.
[13] U. M. Choi, F. Blaabjerg, S. Jorgensen, F. Iannuzzo, H. Wang, C. Uhrenfeldt, and S. Munk-Nielsen, “Power cycling test and failure analysis of molded Intelligent Power IGBT Module under different temperature swing durations.” Microelectronics Reliability, vol. 64, pp. 403-408, Sep. 2016.
[12] J. S. Lee, U. M. Choi, and K. B. Lee, “Comparison of Tolerance Controls for Open-Switch Fault in a Grid-Connected T-Type Rectifier,” IEEE Trans. on Power Electronics, vol. 30, no. 10, pp. 5810-5820, Oct. 2015.
[11] U. M. Choi, F. Blaabjerg, F. Iannuzzo, and S. Jørgensen, “Junction temperature estimation method for a 600 V, 30A IGBT module during converter operation,” Microelectronics Reliability, vol. 55, no. 9-10, pp. 2022-2026, Aug.-Sep. 2015.
[10] U. M. Choi, F. Blaabjerg, and K. B. Lee, “Reliability Improvement of a T-Type Three-Level Inverter With Fault-Tolerant Control Strategy,” IEEE Transactions on Power Electronics, vol. 30, no. 5, pp. 2660-2673. May 2015.
[9] U. M. Choi, F. Blaabjerg, and K. B. Lee, “Study and Handling Methods of Power IGBT Module Failures in Power Electronic Converter Systems,” IEEE Transactions on Power Electronics, vol. 30, no. 5, pp. 2517-2533. May 2015.
[8] U. M. Choi, F. Blaabjerg, and K. B. Lee, “Control Strategy of Two Capacitor Voltages for Separate MPPTs in Photovoltaic Systems Using Neutral-Point-Clamped Inverters,” IEEE Transactions on Industry Applications, vol. 51, no. 4, pp. 3295-3303. July-Aug. 2015.
[7] U. M. Choi, F. Blaabjerg, and K. B. Lee, “Method to Minimize the Low-Frequency Neutral-Point Voltage Oscillations With Time-Offset Injection for Neutral-Point-Clamped Inverters,” IEEE Transactions on Industry Applications, vol. 51, no. 2, pp. 1678-1691. Mar.-Apr. 2015.
[6] U. M. Choi, K. B. Lee, and, F. Blaabjerg “Diagnosis and Tolerant Strategy of an Open-Switch Fault for T-Type Three-Level Inverter Systems,” IEEE Transactions on Industry Applications, vol. 50, no. 1, pp. 495-508. Jan.-Feb. 2014.
[5] U. M. Choi, J. S. Lee and K. B. Lee, “New Modulation Strategy to Balance the Neutral-Point Voltage for Three-Level Neutral-Clamped Inverter Systems,” IEEE Trans. on Energy Conversion, vol. 29, no. 1, pp. 91-100. Mar. 2014.
[4] U. M. Choi, H. H. Lee and K. B. Lee, “Simple Neutral-Point Voltage Control for Three-Level Inverters Using a Discontinuous Pulse Width Modulation,” IEEE Trans. on Energy Conversion, vol. 28, no. 2, pp. 434-443. Jun. 2013.
[3] U. M. Choi, and K. B. Lee, “Space vector modulation strategy for neutral-point voltage balancing in three-level inverter systems,” IET Power Electronics, vol. 6, no. 7, pp. 1390-1398. Aug. 2013.
[2] U. M. Choi, and K. B. Lee, “Neutral-Point Voltage Balancing Method for Three-Level Inverter Systems with a Time-Offset Estimation Scheme,” Journal of Power Electronics, vol. 13, no. 2, pp. 243-249. Mar. 2013.
[1] U. M Choi, H. G. Jeong, K. B. Lee, and F. Blaabjerg, “Method for Detecting an Open-Switch Fault in a Grid-Connected NPC Inverter System,” IEEE Trans. on Power Electronics, vol. 27, no. 6, pp. 2726-2739, June 2012.
◾ 태양광 시스템의 미션 프로파일을 고려한 3-레벨 NPC 인버터의 DC-link 커패시터 신뢰성 비교 분석, 전력전자학회 논문지, vol.27 No.6 pp.535~540, 2022최의민
◾ Effect of thermal loading definitions on the mission profile-based reliability evaluation of power devices in PV inverters, MICROELECTRONICS RELIABILITY, vol.138, 2022최의민
◾ Single-Phase Five-Level IT-Type NPC Inverter With Improved Efficiency and Reliability in Photovoltaic Systems, IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, vol.10 No.5 pp.5226~5239, 2022최의민
◾ NPC 인버터의 DC-link 커패시터 수명 향상을 위한 전압 변조 방법 비교 평가, 전력전자학회 논문지, vol.27 No.4 pp.291~296, 2022최의민
◾ 미션 프로파일을 고려한 단상 5-레벨 태양광 NPC 인버터의 전력 반도체 소자 수명 분석, 전력전자학회 논문지, vol.27 No.3 pp.221~227, 2022최의민
◾ Velocity Profile-Based Evaluation and Improvement of Lifetime of Power Devices in Railway Propulsion Inverters, IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, vol.10 No.2 pp.1384~1394, 2022최의민
◾ 전압 변조 방법에 따른 단상 5-레벨 NPC 태양광 인버터의 전력 손실 및 열 부하 분석, 전력전자학회 논문지, vol.27 No.1 pp.56~62, 2022최의민
◾ Comparative Evaluation of Efficiency and Reliability of Single-Phase Five-Level NPC Inverters for Photovoltaic Systems, IEEE ACCESS, vol.9 pp.120638~120651, 2021최의민
[20] U. M. Choi, and F. Blaabjerg, “Effect of Asymmetric Layout of IGBT Modules on Reliability of Power Inverters in Motor Drive System,” in Proc. of AEPC 2018, pp. 193-197, Mar. 2018.
[19] U. M. Choi, and F. Blaabjerg, “Real-time condition monitoring of IGBT modules in PV inverter systems,” in Proc. of CIPS 2018, pp. 1-5, Mar. 2018.
[18] U. M. Choi, and F. Blaabjerg, “Asymmetric Power Device Rating Selection for Even Temperature Distribution in NPC Inverter,” in Proc. of ECCE 2017, pp. 4196-4201, Oct. 2017.
[17] K. Ma, U. M. Choi and F. Blaabjerg, “Reliability Metrics Extraction for Power Electronics Converter Stressed by Thermal Cycles,” in Proc. of ECCE 2017, pp. 3838-3842, Oct. 2017.
[16] U. M. Choi, K. Ma and F. Blaabjerg, “Lifetime Prediction of IGBT Modules based on Linear Damage Accumulation,” in Proc. of APEC 2017, pp. 2276-2281, Mar. 2017.
[15] K. Ma, U. M. Choi, and F. Blaabjerg, “Impacts of Ripple Current to the Loading and Lifetime of Power Semiconductor Device,” in Proc. of APEC 2017, pp. 2305-2311, Mar. 2017.
[14] U. M. Choi, F. Blaabjerg, and S. Jørgensen, “Effect of Junction Temperature Swing Durations on a Lifetime of a Transfer Molded IGBT Module,” in Proc. of ECCE 2016, Sep. 2016.
[13] U. M. Choi, F. Blaabjerg, S. Munk-Nielsen, S. Jørgensen and B. Rannestad, “Condition Monitoring of IGBT Module for Reliability Improvement of Power Converters,” in Proc. of ITEC Asia-Pacific 2016, pp. 602-607. June 2016.
[12] U. M. Choi, and F. Blaabjerg, “A novel active T-type three-level converter with open-circuit fault-tolerant control,” in Proc. of ECCE 2015, pp. 4765-4772. Sep. 2015.
[11] U. M. Choi, I. Trintis, F. Blaabjerg, S. Jørgensen, and M. L. Svarre, “Advanced Power Cycling Test for Power Module with On-line On-state VCE Measurement,” in Proc. of APEC 2015, pp. 2919-2924, Mar. 2015.
[10] U. M. Choi, F. Blaabjerg, J. S. Lee, and K. B. Lee, “Open-circuit fault diagnosis for a grid-connected NPC inverter with unity Power Factor,” in Proc. of APEC 2015, pp. 213-220, Mar. 2015.
[9] U. M. Choi, and F. Blaabjerg, “Junction temperature estimation for an advanced active power cycling test,” in Proc. of ICPE-ECCE Asia 2015, pp. 2944-2950, June 2015.
[8] U. M. Choi, F. Blaabjerg, and K. B. Lee, “Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters,” in Proc. of APEC 2014, pp. 1718-1724, Mar. 2014.
[7] U. M. Choi, K. B. Lee and F. Blaabjerg, “Method to minimize the low-frequency neutral-point voltage oscillations with time-offset injection for neutral-point-clamped inverters,” in Proc. of ECCE 2013, pp. 4022-4029. Sep. 2013.
[6] U. M. Choi, and K. B. Lee, “Detection method of an open-switch fault and fault-tolerant strategy for a grid-connected T-type three-level inverter system,” in Proc. of ECCE 2012, pp. 4188-4195. Sep. 2012.
[5] U. M. Choi, H. G. Jeong and K. B. Lee, “Method of neutral-point voltage balancing for a grid connected NPC inverter system with time-offset variant estimating,” in Proc. of IPEMC 2012, pp. 499-504. Jun. 2012.
[4] U. M. Choi, K. B. Lee and F. Blaabjerg, “Diagnosis method of an open-switch fault for a grid-connected T-type three-level inverter system,” in Proc. of PEDG 2013, pp. 470-475. Jun. 2012.
[3] U. M. Choi, Kyo-Beum Lee, and Frede Blaabjerg, “Power electronics for renewable energy systems: Wind turbine and photovoltaic systems,” in Proc. of ICRERA 2012, Nov. 2012.
[2] H. H. Lee, U. M. Choi, and Kyo-Beum Lee “Neutral-Point Voltage Control for Grid-connected Three-Level Inverters using a Discontinuous Pulse Width Modulation,” in Proc. of VCCP2012, pp. 638-642, Oct. 2012.
[1] H. G. Jeong, U. M. Choi, Kyo-Beum Lee, “Control strategies for wind power systems to meet grid code requirements,” in Proc. of IECON 2011, pp. 1250 – 1255, Nov. 2011.
◾ 최재헌, 최의민, 미션 프로파일을 고려한 태양광 NPC 인버터의 DC-link 커패시터 신뢰성 분석, 전력전자학술대회 논문집, 경주 한화리조트, 2022최의민
◾ 류태림, 최의민, 태양광 발전 시스템의 미션 프로파일을 고려한단상 5-레벨 NPC 인버터의 전력 반도체 소자 수명, 전력전자학회 추계학술대회 논문집, 온라인, 2021최의민
◾ 최재헌, 최의민, NPC 인버터의 DC-link 커패시터 전류 리플 감소를 위한 전압 변조 방법 비교 평가, 전력전자학회 추계학술대회 논문집, 온라인, 2021최의민
◾ 류태림, 최의민, 태양광 발전 시스템에서 전압 변조 방법에 따른 단상 5레벨 NPC 인버터의 열 부하 분석, 전력전자학회 학술대회 논문집, 소노벨변산, 2021최의민
K. B. Lee and U. M. Choi, “Fault and Diagnosis Systems in Power Converters,” in Advanced and Intelligent Control in Power Electronics and Drives, vol. 531, Springer, pp. 143-178, Jan. 2014. ISBN: 978-3-319-03400-3.
[1] (Registration) Apparatus and Method for Fault Diagnosis of Switching Device in Neutral Point Clamped Inverter System, Korean Patent 10-1242250, Mar. 3, 2013.
[2] (Registration) Fault Switch Diagnosis Apparatus and Method of 3 Level T-Type Inverter, Korean Patent 10-1331028, Nov. 13, 2013.
[3] (Registration) Neutral Point Voltage Controller and Method of three-level Inverter Using DPWM, Korean Patent 10-1343428, Dec. 13, 2013.
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