Publications

• A. P. S. Meliopoulos, Y. Liu, S. Choi, and G. J. Cokkinides, Protection, control, and operation of microgrids, in Advances in Electric Power and Energy: Static State Estimation, 1st ed., M. E. El-Hawary, Ed. Hoboken, NJ, USA: Wiley, Mar. 2021, ch. 5, pp. 123-169.

• M. Yoon, X. Zhang, and S. Choi*, Strategic intentional islanding method considering temporary overvoltage in disaster situations, International Journal of Electrical Power & Energy System, vol. 165, p. 110488, Apr. 2025.

• Y. Yoon, M. Yoon, X. Zhang, and S. Choi*, Safe deep reinforcement learning-based real-time operation strategy in unbalanced distribution system, IEEE Transactions on Industry Applications, vol. 60, no. 6, pp. 8273-8283, Nov.-Dec. 2024.

• H. Kim, H. Woo, Y. Yoon, H.-T. Kim, Y. J. Kim, M. Kang, X. Zhang, and S. Choi*, An enhanced continuation power flow method using hybrid parameterization, Sustainability, vol. 16, no. 17, p. 7595, Sep. 2024.

• B. Shin, H. Lee, and S. Choi*, Analysis of underground distribution system models for secondary substations, Energies, vol. 17, no. 17, p. 4345, Aug. 2024.

• J. Su, R. Zhang, P. Dehghanian*, M. H. Kapourchali, S. Choi, and Z. Ding, Renewable-dominated mobility-as-a-service framework for resilience delivery in hydrogen-accommodated microgrids, International Journal of Electrical Power & Energy System, vol. 159, p. 110047, Aug. 2024.

• Y. Son, H. Woo, J. Noh, P. Dehghanian, X. Zhang*, and S. Choi*, Optimization of energy storage scheduling considering variable-type minimum SOC for enhanced disaster preparednesss, Journal of Energy Storage, vol. 93, p. 112366, Jul. 2024.

• J. Yoo, Y. Son, M. Yoon, and S. Choi*, A wind power scenario generation method based on copula functions and forecast errors, Sustainability, vol. 15, no. 23, p. 16536, Dec. 2023.

• J. Noh, S. Gham, M. Yoon, W. Chae, W. Kim, and S. Choi*, Enhanced non-communication-based protection coordination and advanced verification method using fault impedance in networked distribution systems, Sustainability, vol. 15, no. 21, p. 15593, Nov. 2023.

• J. Noh, S. Gham, M. Yoon, W. Chae, W. Kim, and S. Choi*, A study on a communication-based algorithm to improve protection coordination under high-impedance fault in networked distribution systems, Sustainability, vol. 15, no. 21, p. 15399, Oct. 2023.

• X. Zhang, H. Woo, and S. Choi*, An interval power flow method for radial distribution systems based on hybrid second-order cone and linear programming, Sustainable Energy, Grids and Networks, vol. 36, p. 101158, Dec. 2023.

• Y. G. Son, S. Choi, M. A. Aquah, and S.-Y Kim*, Systematic planning of power-to-gas for improving photovoltaic acceptance rate: Application of the potential RES penetration index, Applied Energy, vol. 349, p. 121611, Nov. 2023.

• Y. Son, X. Zhang, Y. Yoon, J. Cho, and S. Choi*, LSTM–GAN based cloud movement prediction in satellite images for PV forecast, Journal of Ambient Intelligence and Humanized Computing, vol. 14, no. 9, pp. 12373-12386, Sep. 2023.

• H. Woo, Y. Son, J. Cho, S.-Y. Kim, and S. Choi*, Optimal expansion planning of electric vehicle fast charging stations, Applied Energy, vol. 342, p. 121116, Jul. 2023.

• M. Yoon, N. Cho, and S. Choi*, Analysis of temporary overvoltage due to inverter-based distributed generation in networked distribution systems, Applied Energy, vol. 341, p.121059, Jul. 2023.

• X. Zhang, D. Shin, Y. Son, H. Woo, S.-Y. Kim, and S. Choi*, Three-stage flexibility provision framework for radial distribution systems considering uncertainties, IEEE Transactions on Sustainable Energy, vol. 14, no. 2, pp. 948-961, Apr. 2023.

• H. Noh, H. Cho, S. Choi, and B. Lee*, Mitigating subsynchronous torsional interaction using geometric feature extraction method, Sustainability, vol. 14, no. 23, p. 16110, Dec. 2022.

• X. Zhang, D.-J. Kang, and S. Choi*, Evaluation of false data injection attacks on automatic generation control considering wind power dynamics, International Journal of Electrical Power & Energy Systems, vol. 143, p. 108400, Dec. 2022.

• N. Cho, M. Yoon, and S. Choi*, Impact of transformer topology on short-circuit analysis in distribution systems with inverter-based distributed generations, Sustainability, vol. 14, no. 15, p. 9781, Aug. 2022.

• H. Woo, Y. Son, J. Cho, and S. Choi*, Stochastic second-order conic programming for optimal sizing of distributed generator units and electric vehicle charging stations, Sustainability, vol. 14, no. 9, p. 4964, Apr. 2022.

• Y. Son, Y. Yoon, J. Cho, and S. Choi*, Cloud cover forecast based on correlation analysis on satellite images for short-term photovoltaic power forecasting, Sustainability, vol. 14, no. 8, p. 4427, Apr. 2022.

• J. Lee, W. Chae, W. Kim, and S. Choi*, Control strategy for line overload and short circuit current of networked distribution systems, Sustainability, vol. 14, no. 7, p. 4208, Apr. 2022.

• M. Lee, M. Yoon, J. Cho, and S. Choi*, Probabilistic stability evaluation based on confidence interval in distribution systems with inverter-based distributed generations, Sustainability, vol. 14, no. 7, p. 3806, Mar. 2022.

• X. Zhang, Y. Son, and S. Choi*, Optimal scheduling of battery energy storage systems and demand response for distribution systems with high penetration of renewable energy sources, Energies, vol. 15, no. 6, p. 2212, Mar. 2022.

• X. Zhang, Y. Son, T. Cheong, and S. Choi*, Affine-arithmetic-based microgrid interval optimization considering uncertainty and battery energy storage system degradation, Energy, vol. 242, p. 123015, Mar. 2022.

Past Journals (SCIE)

• M. Yoon, J. Jeong, and S. Choi, Intentional islanding method with temporary overvoltage analysis, in Proceedings on International Conference on Electricity Distribution (CIRED) 2024 Chicago Workshop, Chicago, IL, USA, Nov. 2025.

• Y. Jung, S. Kang, K. Kim, H. Woo, S. Choi, and G. Jang, Transient stability data driven special protection scheme using deep reinforcement learning, in Proceedings on 13th IEEE International Conference on Renewable Energy Research and Applications (ICRERA), Nagasaki, Japan, Nov. 2024. 

• H. Woo, S. Choi, S. Kim, S. Kim, and J. Kwak, Hybrid AC/DC transmission expansion planning considering offshore windfarms in Korea, in Proceedings on 2024 IEEE Power & Energy Society General Meeting (PESGM), Seattle, WA, USA, Jul. 2024.

• Y. Yoon, Y. Son, and S. Choi, Deep reinforcement learning-based operation strategy for high resilience distribution system, in Proceedings on International Conference on Electricity Distribution (CIRED) 2024 Vienna Workshop, Vienna, Austria, Jun. 2024.

• Y. Yoon, M. Yoon, and S. Choi, Safe deep reinforcement learning-based real-time operation strategy in unbalanced distribution system, in Proceedings on 2023 IEEE Industry Applications Society (IAS) Annual Meeting, Nashville, TN, USA, Oct. 2023.

• H. Woo, Y. Son, and S. Choi, Optimal scheduling model for renewable energy source-assisted electric and hydrogen vehicle charging station in HPS market, in Proceedings on 2023 IEEE Power & Energy Society General Meeting (PESGM), Orlando, FL, USA, Jul. 2023.

• J. Cho, H. Kim, H. Ryu, J. Lee, J. Kim, Y. Son, and S. Choi, A study of mid-to long-term distribution planning based on PV installation forecasting, in Proceedings on the 27th International Conference on Electricity Distribution (CIRED), Rome, Italy, Jun. 2023.

• Y. Son, H. Woo, and S. Choi, A study on the application of game theory for optimal operation of electric vehicle charging station, in Proceedings on the 13th International Conference on Information and Communication Technology Convergence (ICTC), Jeju, South Korea, Oct. 2022.

• J. Noh, W. Chae, W. Kim, and S. Choi, A study on meshed distribution system and protection coordination using HILS system, in Proceedings on the 13th International Conference on Information and Communication Technology Convergence (ICTC), Jeju, South Korea, Oct. 2022.

• Y. Yoon, and S. Choi, Application of reinforcement learning to operate the unbalanced distribution system, in Proceedings on the 13th International Conference on Information and Communication Technology Convergence (ICTC), Jeju, South Korea, Oct. 2022.

• H. Woo, Y. Son, and S. Choi, EV charging demands and problem formulation for the optimization of the hydrogen-integrated electric vehicle charging station: a review, in Proceedings on the 13th International Conference on Information and Communication Technology Convergence (ICTC), Jeju, South Korea, Oct. 2022.

• D. Shin and S. Choi, Non-communication protection scheme for meshed distribution systems using a new time-current-voltage characteristic, in Proceedings on the 13th International Conference on Information and Communication Technology Convergence (ICTC), Jeju, South Korea, Oct. 2022.

Past Conference Proceedings (International)

PENDING

• S. Choi and H. Woo, Device and method for optimal scheduling for electric and hydrogen vehicle charging station in hydrogen portfolio standard market, PCT/KR2024/095865, May 30 (pending).

• S. Choi and Y. Yoon, Device and method for resolving voltage imbalance in power distribution system on basis of reinforcement training model considering physical constraints, PCT/KR2024/002677, Feb. 29, 2024 (pending).

• S. Choi, H. Woo, and Y. Son, Method for selecting optimal location for electric vehicle charging station for charging load balancing, PCT/KR2023/000106, Jan. 3, 2023 (pending).

FILED

• S. Choi and J.-W. Lee, Device and method for protecting distribution system using impedance relay (임피던스 계전기를 이용한 배전 계통의 고장 검출 보호 장치 및 방법), Korea Patent 10-2767417, Feb. 10, 2025.

• S. Choi, Y. Yoon, J. Im, and G. Jang, Optimization method to compensate unbalanced voltage for control active power and reactive power (배전 계통 내 인버터 기반 분산형 전원의 유효 전력 및 무효 전력 출력 제어를 통한 전압 불평형 해소 최적화 방법), Korea Patent 10-2690962, Jul. 29, 2024.

• S. Choi, H. Woo, and Y. Son, Method of optimal placement of electric vehicle charging station for charging demand dispersion, Korea Patent 10-2674216, Jun. 5, 2024.

• S. Choi and Y. Son, Apparatus and method for predicting of energy generation (발전량 예측 장치 및 방법), Korea Patent 10-2526503, Apr. 24, 2023. 

• S. Choi, Y. Son, Y. Yoon, and E. Hong, Device and method for forecasting renewable energy generation using ensemble machine learning (앙상블 기계학습 방법을 이용한 재생 에너지 발전량 예측 장치 및 방법), Korea Patent 10-2361007, Jul. 14, 2021.

• S. Choi and J. Lee, Intelligent equipment protection method based on dynamic state estimation (동적상태추정 기반 지능형 산업기기 보호 방법), Korea Patent 10-2026926, Sep. 24, 2019.

PENDING

• S. Choi and J. Joon, Device and method for hybrid control for mitigation of IBR SSO considering optimized control parameters (제어 파라미터 최적화 적용 하이브리드 제어를 통한 인버터 기반 자원 진동 완화 장치 및 방법), Korea Patent 10-2025-0029581, Mar. 7, 2025 (pending).

• S. Choi and H. Woo, Device and method for optimal scheduling for electric and hydrogen vehicle charging station in hydrogen portfolio standard market, Korea Patent 10-2022-0069280, May 30, 2023 (pending).

• S. Choi and Y. Son, Device and method for operating electrical vehicle charging station based on game theory, Korea Patent 10-2023-0044393, Apr. 4, 2023 (pending).

• S. Choi and Y. Yoon, Physics-informed reinforcement learning model for compensating unbalanced voltage in the distribution system, Korea Patent 10-2023-0040906, Mar. 29, 2023 (pending).

• S. Choi and M.-S. Yoon, Distribution system reactor for mitigating flicker, Korea Patent 10-2022-0037181, Mar. 25, 2022 (pending).

• S. Choi, Y. Son, B. Lee, G. Jang, and S. Joo, A new TSO-DSO coordination framework under high penetration levels of renewable energy sources, Korea Patent 10-2022-0000539, Jan. 03, 2022 (pending).

• S. Choi, J. Im, and Y. Yoon, Parameter estimation technique for transformer frequency response model using ensemble learning, Korea Patent 10-2022-0000494, Jan. 03, 2022 (pending).

• S. Choi, Y. Son, B. Lee, G. Jang, and S. Joo, Development of system stability analysis considering potential distributed resources in future power system, Korea Patent 10-2022-0000483, Jan. 03, 2022 (pending).

• J. Yoo and S. Choi*, Development of a distribution system analysis program considering various distributed generations and distributed generation connection codes, The Transactions of the Korean Institute of Electrical Engineers, vol. 72P, no. 3, pp. 223-230, Sep. 2023. 

• J. Noh and S. Choi*, Protection coordination test in network distribution systems using HILS, Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, vol. 37, no. 4, pp. 42-49, Aug. 2023. 

• S. Choi*, Massive wildfires throughout Korean eastern coast and sub-synchronous oscillation events, KIEE Magazine, vol. 71, no. 6, pp. 10-13, Jun. 2022.

• J. Im, Y. Yoon, and S. Choi*, Parameter estimation of transformer frequency response model using machine learning methods, Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, vol. 36, no. 2, pp. 8-13, Feb. 2022.

• D. Shin and S. Choi*, Economic design of grounding systems through the application of new grounding resistance reduction materials, The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers, Vol. 36, no. 1, pp. 31-35, Jan 2022.

Past Journals (Korean Domestic)

• J. Jang, M. Yoon, Y. Yoon, and S. Choi, Analysis and modeling of real world inverter based resources sub-synchronous oscillation cases, in Proceedings on 2024 Korea Institute of Electrical Engineers (KIEE) Fall Conference for Society A, Gyeongju, Oct. 2024.

• S. Han and S. Choi, Short-circuit analysis based on interconnection method of photovoltaic systems in an industrial network, in Proceedings on 2024 Korea Institute of Electrical Engineers (KIEE) Fall Conference for Society A, Gyeongju, Oct. 2024.

•  S. Gham, M. Yoon, J. Lee, J. Kim, D. Lee, and S. Choi, A method of selecting the capacity of the reactive power compensators at the connection point of the offshore wind farm, in Proceedings on 2024 Korea Institute of Electrical Engineers (KIEE) Fall Conference for Society A, Gyeongju, Oct. 2024.

• H. Kim, Y. Kim, M. Kang, and S. Choi, A Study on electrolyzer placement evaluation method considering renewable generation scenario, in Proceedings on 2024 55th Korea Institute of Electrical Engineers (KIEE) Summer Conference, Jeju, Jul. 2024.

• Y. Son, Y. Yoon, and S. Choi, Maximum hosting capacity estimation in AC/DC hybrid distribution networks, in Proceedings on 2024 55th Korea Institute of Electrical Engineers (KIEE) Summer Conference, Jeju, Jul. 2024.

• M. Yoon and S. Choi, Stability analysis for microgrid operation in distribution system with GFM inverter, in Proceedings on 2024 55th Korea Institute of Electrical Engineers (KIEE) Summer Conference, Jeju, Jul. 2024.

• H. Woo, S. Kim, J. Kwak, and S. Choi, A framework for the determination of optimal operating point of multi-terminal DC for transfering surplus power in HoNam area, in Proceedings on 2024 55th Korea Institute of Electrical Engineers (KIEE) Summer Conference, Jeju, Jul. 2024.

• Y. Yoon, J. Jang, M. Yoon, and S. Choi, Design of the physics-informed reinforcement learning model to mitigate subsynchronous oscillation, in Proceedings on 2024 55th Korea Institute of Electrical Engineers (KIEE) Summer Conference, Jeju, Jul. 2024.

• Y. Son, Y. Yoon, J. Jang, and S. Choi, Generating a synthetic SSO signal using GANs, in Proceedings on 2024 Korean Institute of Illuminating and Electrical Installation Engineers (KIIEE) Annual Spring Conference, Pyeongchang, May. 2024.

• J. Lee, Y. Yoon, J. Yoo, S. Choi, M. Jung, and S. Yun, A study on predicting thermal runaway of LTO type lithium-ion battery cells using machine learning, in Proceedings on 2023 Korean Society of Automotive Engineers (KSAE) Fall Conference, Ulsan, Nov. 2023.

• J. Noh and S. Choi, A study on protection coordination algorithm in case of high-impedance fault in networked distribution system, in Proceedings on 2023 Korean Institute of Illuminating and Electrical Installation Engineers (KIIEE) Annual Fall Conference, Jeju, Nov. 2023.

• J. Jang, M. Yoon, and S. Choi, Design auxiliary control of PLL grid following inverter for oscillation mitigation, in Proceedings on 2023 Korean Institute of Illuminating and Electrical Installation Engineers (KIIEE) Annual Fall Conference, Jeju, Nov. 2023.

• S. Gham, J. Yoo, M. Yoon, and S. Choi, Fault contribution of PV system according to the grounding types of LVDC microgrid, in Proceedings on 2023 Korean Institute of Illuminating and Electrical Installation Engineers (KIIEE) Annual Fall Conference, Jeju, Nov. 2023.

• Y. Son, H. Woo, J. Noh, K. Hong, M. Lee, and S. Choi, Simulation of power outage duration based on minimum SOC of ESS in disaster situations, in Proceedings on 2023 Korea Institute of Electrical Engineers (KIEE) Fall Conference for Society A, Busan, Oct. 2023.

• C. Lee and S. Choi, A method of analyzing power flow considering the analysis of unbalanced current to the source through ground and neutral line the state of three-phase four-wire multi-grounded distribution line, in Proceedings on 2023 Korea Institute of Electrical Engineers (KIEE) Fall Conference for Society A, Busan, Oct. 2023.

• M. Yoon, J. Jang, and S. Choi, Mathematical modeling for stability analysis in grid with inverter-based resources, in Proceedings on 2023 Korea Institute of Electrical Engineers (KIEE) Fall Conference for Society A, Busan, Oct. 2023.

• H. Woo, Y. Son, and S. Choi, A study on optimal operation framework for RES-assisted EV-HV charging station considering HPS market, in Proceedings on 2023 Korea Institute of Electrical Engineers (KIEE) Fall Conference for Society A, Busan, Oct. 2023.

• H. Kim, H. Woo, H.-T. Kim, Y. J. Kim, M. Kang, and S. Choi, A study on selecting optimal connection bus for electrolysis considering distribution voltage stability, in Proceedings on 2023 Korea Institute of Electrical Engineers (KIEE) Fall Conference for Society A, Busan, Oct. 2023.

• Y. Yoon, M. Yoon, J. Jang, and S. Choi, Reinforcement learning-based sub-synchronous oscillation (SSO) mitigation method, in Proceedings on 2023 Korea Institute of Electrical Engineers (KIEE) Fall Conference for Society A, Busan, Oct. 2023.

• J. Yoo, S. Gham, M. Yoon, N. Cho, and S. Choi, A study on impact of transformer core type and winding connection of distributed generator to temporary over-voltage in distribution system, in Proceedings on 2023 54th Korea Institute of Electrical Engineers (KIEE) Summer Conference, Pyeongchang, Jul. 2023.

• J. Yoo and S. Choi, A Study on the analysis of distribution system using prediction-based probabilistic scenario generation method, in Proceedings on 2023 54th Korea Institute of Electrical Engineers (KIEE) Summer Conference, Pyeongchang, Jul. 2023.

• J. Lee, M. Jung, J. Mok, S. Choi, and S. Yun, A study on the analysis of thermal runaway models in LTO-Type lithium-ion batteries, in Proceedings on 2023 Korean Society for Railway (KSR) Spring Conference, Changwon, May 2023.

• A. Abdulla and S. Choi, An energy management strategy for hybrid energy storage based microgrids using fuzzy Logic, in Proceedings on 2023 Korean Institute of Illuminating and Electrical Installation Engineers (KIIEE) Annual Spring Conference, Pyeongchang, May 2023.

• S. Gham, J. Noh, and S. Choi, Protection coordination test of a relay with HILS based distribution system modeling, in Proceedings on 2023 Korean Institute of Illuminating and Electrical Installation Engineers (KIIEE) Annual Spring Conference, Pyeongchang, May 2023.

• J. Jang, M. Yoon, and S. Choi, Small signal modeling of inverter based resources for analyzing SSO in weak grids, in Proceedings on 2023 Korean Institute of Illuminating and Electrical Installation Engineers (KIIEE) Annual Spring Conference, Pyeongchang, May 2023.

• S. Lee, H. Woo, and S. Choi, A study on the modeling of renewable energy uncertainty based on Affine-arithmetic theory, in Proceedings on 2023 Korean Institute of Illuminating and Electrical Installation Engineers (KIIEE) Annual Spring Conference, Pyeongchang, May 2023.

Past Conference Proceedings (Korean Domestic)