Sandia Energy > Programs > Energy Storage > Staff > Hyungjin Choi Hyungjin Choi, Ph.D. Electrical Engineer Contact Information Hyungjin Choi, Ph.D. / (505) 313-9480 Biography Hyungjin Choi received the Ph.D. degree in Electrical Engineering from University of Minnesota in 2017 focusing on convex optimization approaches for transient stability and uncertainty propagation in power systems. Before joining Sandia, he worked as a software engineer at Siemens Digital Grid on developing transmission network applications for energy management system and energy market management system products. From 2017-2018, he worked as a postdoctoral research associate at the University of Illinois, Urbana Champaign, on stability of a microgrid cybersecurity. He is currently serving as a senior member of technical staff in Energy Storage Technology and Systems group at Sandia National Laboratories, mainly focusing on modeling, optimization, and control of power system operation with energy storage systems. Research Interests Stability and uncertainty analysis of power systems with renewables and energy storage systems Operator theoretic methods for data-driven analysis and control of nonlinear dynamical systems Data-driven analytics for power grid and energy storage system operation and control Education Ph.D. in Electrical and Computer Engineering, University of Minnesota B.S. in Electrical and Electronics Engineering, INHA University, Incheon, South Korea Google Scholar Hyungjin Choi, Ph.D. Key Publications H. Choi, U. Vaidya, Y. Chen A convex data-driven approach for nonlinear control synthesis arXiv: 2006.15477, 2020. H.J. Liu, H. Choi, P. Buason, A. Valdes Probabilistic bounds on the impact of potential data integrity attacks in microgrids Proceedings of the 52nd Hawaii International Conference on System Sciences, 2019, DOI: 10.24251/HICSS.2019.425. P. Buason, H. Choi, A. Valdes, H.J. Liu “Cyber-Physical Systems of Microgrids for Electrical Grid Resiliency” 2019 IEEE International Conference on Industrial Cyber Physical Systems (ICPS), Taipei, Taiwan, 2019, pp. 492-497, DOI: 10.1109/ICPHYS.2019.8780336. H. Choi, S. Bose Transient stability analysis of power systems using Koopman operators Preprint, 2018. H. Choi, P.J. Seiler, S.V. Dhople Propagating uncertainty in power flow with the Alternating Direction Method of Multipliers IEEE Transactions on Power Systems, vol. 33, no. 4, pp. 4124-4133, July 2018, DOI: 10.1109/TPWRS.2017.2778050.