Sandia Energy > Programs > Energy Storage > Staff > Ujjwol Tamrakar Ujjwol Tamrakar Electrical Engineer Contact Information Ujjwol Tamrakar / (505) 269-2415 Biography Ujjwol Tamrakar received the B.E. degree in Electrical Engineering from Tribhuvan University, Nepal, in 2011, and the M.S. degree in Electrical Engineering from South Dakota State University (SDSU), Brookings, SD, USA, in 2015. He received his Ph.D. in Electrical Engineering from SDSU in 2020 and is currently working as a Postdoctoral Appointee at Sandia National Laboratories, Albuquerque, NM, USA. His research interests include grid integration of renewable energy systems, energy storage analytics, power system modeling and stability, and optimal control. Recently, he has been actively involved in various IEEE task forces related to voltage and frequency stability of power systems with high renewable penetration. Research Interests Grid integration of renewable energy systems Energy storage analytics Power system modeling and stability Optimal control Power electronics Education Ph.D. in Electrical Engineering, South Dakota State University, 2020 M.S. in Electrical Engineering, South Dakota State University, 2015 B.E. in Electrical Engineering, Tribhuvan University (Kathmandu, Nepal), 2011 Google Scholar Ujjwol Tamrakar Key Publications U. Tamrakar, D. Shrestha, M. Maharjan, B.P. Bhattarai, T.M. Hansen, R. Tonkoski “Virtual Inertia: Current Trends and Future Directions” Applied Sciences, vol. 7, no. 8, pp. 654, June 2017, DOI: 10.3390/app7070654. M. Farrokhabadi et al., “Microgrid Stability Definitions, Analysis, and Examples” IEEE Transactions on Power Systems, vol. 35, no. 1, pp. 13-29, Jan. 2020, DOI: 10.1109/TPWRS.2019.2925703. H. Sun et al., “Review of Challenges and Research Opportunities for Voltage Control in Smart Grids” IEEE Transactions on Power Systems, vol. 34, no. 4, pp. 2790-2801, July 2019, DOI: 10.1109/TPWRS.2019.2897948. U. Tamrakar, D. Galipeau, R. Tonkoski, I. Tamrakar “Improving transient stability of photovoltaic-hydro microgrids using virtual synchronous machines” IEEE Eindhoven PowerTech, Eindhoven, 2015, pp. 1-6, DOI: 10.1109/PTC.2015.7232663. D. Shrestha, U. Tamrakar, N. Malla, Zhen Ni, R. Tonkoski “Reduction of energy consumption of virtual synchronous machine using supplementary adaptive dynamic programming” IEEE International Conference on Electro Information Technology (EIT), Grand Forks, ND, 2016, pp. 0690-0694, DOI: 10.1109/EIT.2016.7535323.