Ujjwol Tamrakar

Electrical Engineer

Author profile picture

Electrical Engineer

utamrak@sandia.gov

(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.

Research Interests

  • Grid integration of resilient 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, Ph.D.

Publications

  • Eddy, J.P., Vining, W.F., Tamrakar, U., & Tamrakar, U. (2024). Storage Sizing and Placement Simulation – Quick-Start Case Study User’s Guide. https://www.osti.gov/biblio/2430055 Publication ID: 125208
  • Rauniyar, M., Bhujel, N., Aryal, T., Cicilio, P., Tamrakar, U., Fourney, R., Moradi Rekabdarkolaee, H., Shirazi, M., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2024). Experimental Validation of a Diesel Genset Frequency Dynamics Model for Use in Remote Area Power Systems. IEEE Access, 12, pp. 86319-86332. https://doi.org/10.1109/access.2024.3413788 Publication ID: 124852
  • Rai, A., Bhujel, N., Tamrakar, U., Hummels, D., Tonkoski, R., & Tonkoski, R. (2023). Data-Driven Model Predictive Control for Fast-Frequency Support [Conference Proceeding]. https://doi.org/10.1109/ECCE53617.2023.10362777 Publication ID: 126264
  • Bhujel, N., Rai, A., Tamrakar, U., Zhu, Y., Hummels, D., Tonkoski, R., & Tonkoski, R. (2023). Soft Actor Critic Based Voltage Support for Microgrid Using Energy Storage System [Conference Poster]. https://doi.org/10.2172/2430698 Publication ID: 126400
  • Bhujel, N., Rai, A., Tamrakar, U., Zhu, Y., Hansen, T.M., Hummels, D., Tonkoski, R., & Tonkoski, R. (2023). Soft Actor-Critic Based Voltage Support for Microgrid Using Energy Storage Systems [Conference Paper]. 2023 IEEE PES Innovative Smart Grid Technologies Latin America, ISGT-LA 2023. https://doi.org/10.1109/ISGT-LA56058.2023.10328313 Publication ID: 127820
  • Rai, A., Bhujel, N., Tamrakar, U., Hummels, D., Tonkoski, R., & Tonkoski, R. (2023). Data-Driven Model Predictive Control for Fast-Frequency Support [Conference Poster]. 2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023. https://doi.org/10.2172/2430695 Publication ID: 126392
  • Reno, M.J., Ropp, M.E., Tamrakar, U., Darbali-Zamora, R., Broderick, R.J., & Broderick, R.J. (2022). Designing Resilient Communities: Hardware demonstration of resilience nodes concept. https://doi.org/10.2172/1902867 Publication ID: 80460
  • Rai, A., Bhujel, N., Tamrakar, U., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2022). Implementation of Model Predictive Control for Frequency Support in a Real-time Digital Simulator [Conference Poster]. https://doi.org/10.2172/2006109 Publication ID: 121160
  • Rai, A., Bhujel, N., Tamrakar, U., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2022). Implementation of Model Predictive Control for Frequency Support in a Real-time Digital Simulator [Conference Paper]. https://www.osti.gov/biblio/2005905 Publication ID: 120368
  • Tamrakar, U., Furlani Bastos, A., Roberts-Baca, S., Bhalla, S., McNamara, J., Nguyen, T., & Nguyen, T. (2022). Global Energy Storage Database: Enhancing Features and Validation Procedure [Conference Paper]. https://doi.org/10.1109/EESAT55007.2022.9998037 Publication ID: 120376
  • Vining, W.F., Tamrakar, U., Eddy, J.P., & Eddy, J.P. (2022). Storage Sizing and Placement in Distribution Grids [Conference Poster]. https://doi.org/10.2172/2004870 Publication ID: 118304
  • Tamrakar, U., Nguyen, T., & Nguyen, T. (2022). Model Predictive Control of Energy Storage Systems for Combined Energy Arbitrage and Voltage Regulation [Conference Presenation]. https://doi.org/10.2172/2005379 Publication ID: 118960
  • Rai, A., Bhujel, N., Tamrakar, U., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2022). Implementation of Model Predictive Control for Frequency Support in Real-time Digital Simulator [Conference Poster]. https://doi.org/10.2172/2004012 Publication ID: 115304
  • Bhujel, N., Rai, A., Tamrakar, U., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2022). Identification of Noise Covariances for Voltage Dynamics Estimation in Microgrids [Conference Paper]. https://doi.org/10.1109/PESGM48719.2022.9916663 Publication ID: 109572
  • Bhujel, N., Rai, A., Tamrakar, U., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2022). Identification of Noise Covariances for Voltage Dynamics Estimation in Microgrids [Conference Poster]. IEEE Power and Energy Society General Meeting. https://doi.org/10.2172/2004000 Publication ID: 115256
  • Poudel, B., Aslami, P., Aryal, T., Bhujel, N., Rai, A., Rauniyar, M., Rekabdarkolaee, H.M., Tamrakar, U., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2022). Comparative Analysis of State and Parameter Estimation Techniques for Power System Frequency Dynamics [Conference Paper]. 2022 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2022. https://doi.org/10.1109/SPEEDAM53979.2022.9842272 Publication ID: 111600
  • Guruwacharya, N., Bhandari, H., Subedi, S., Vasquez-Plaza, J.D., Stoel, M.L., Tamrakar, U., Wilches-Bernal, F., Andrade, F., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2022). Data-driven Modeling of Commercial Photovoltaic Inverter Dynamics Using Power Hardware-in-the-Loop [Conference Paper]. 2022 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2022. https://doi.org/10.1109/SPEEDAM53979.2022.9842001 Publication ID: 110904
  • Tamrakar, U., Furlani Bastos, A., Roberts-Baca, S., Bhalla, S., McNamara, J., Nguyen, T., & Nguyen, T. (2022). Global Energy Storage Database: Enhancing Features and Validation Procedure [Conference Poster]. 2022 IEEE Electrical Energy Storage Application and Technologies Conference, EESAT 2022. https://doi.org/10.2172/2004845 Publication ID: 118204
  • Subedi, S., Guruwacharya, N., Tamrakar, U., Cicilio, P., Fourney, R., Rekabdarkolaee, H.M., Tonkoski, R., Hansen, T.M., & Hansen, T.M. (2021). Computationally Efficient Partitioned Modeling of Inverter Dynamics with Grid Support Functions [Slides] [Conference Presenation]. https://doi.org/10.2172/1890911 Publication ID: 76106
  • Bhujel, N., Tamrakar, U., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2021). Optimization-based Voltage Dynamics Estimation and Control of Microgrids [Presentation]. https://www.osti.gov/biblio/1892162 Publication ID: 76259
  • Tamrakar, U., Nguyen, T., & Nguyen, T. (2021). Voltage Regulation in Active Distribution Systems Using Energy Storage Systems [Presentation]. https://www.osti.gov/biblio/1892143 Publication ID: 76237
  • Rauniyar, M., Cicilio, P., Tamrakar, U., Hansen, T.M., Shirazi, M., Fourney, R., Rekabdarkolaee, H., Tonkoski, R., & Tonkoski, R. (2021). Diesel Generator Model Development and Validation using Moving Horizon Estimation [Conference Presenation]. https://doi.org/10.2172/1890909 Publication ID: 76108
  • Subedi, S., Guruwacharya, N., Tamrakar, U., Cicilio, P., Fourney, R., Rekabdarkolaee, H., Tonkoski, R., Hansen, T., & Hansen, T. (2021). Computationally Efficient Partitioned Modeling ofInverter Dynamics with Grid Support Functions [Conference Paper]. https://www.osti.gov/biblio/1890593 Publication ID: 75966
  • Rauniyar, M., Cicilio, P., Bhujel, N., Tamrakar, U., Hansen, T., Shirazi, M., Fourney, R., Rekabdarkolaee, H., Tonkoski, R., & Tonkoski, R. (2021). Diesel Generator Model Development and Validation using Moving Horizon Estimation [Conference Paper]. https://doi.org/10.1109/IECON48115.2021.9589981 Publication ID: 75934
  • Maharjan, M., Tamrakar, U., Ni, Z., Bhattarai, B., Tonkoski, R., & Tonkoski, R. (2021). Overvoltage prevention and curtailment reduction using adaptive droop-based supplementary control in smart inverters. Applied Sciences (Switzerland), 11(17). https://doi.org/10.3390/app11177900 Publication ID: 103716
  • Tamrakar, U., Nguyen, T., Byrne, R.H., & Byrne, R.H. (2021). Model Predictive Dispatch of Energy Storage for Voltage Regulation in Active Distribution Systems [Conference Presenation]. IEEE International Symposium on Industrial Electronics. https://doi.org/10.2172/1870757 Publication ID: 78659
  • Tamrakar, U., Copp, D.A., Nguyen, T., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2021). Optimization-Based Fast-Frequency Estimation and Control of Low-Inertia Microgrids [Conference Presenation]. IEEE Transactions on Energy Conversion. https://doi.org/10.2172/1875246 Publication ID: 79027
  • Bhujel, N., Rai, A., Tamrakar, U., Hansen, T.M., Tonksoki, R., & Tonksoki, R. (2021). A Model Predictive Approach for Voltage Support in Microgrids using Energy Storage Systems [Conference Presenation]. https://doi.org/10.2172/1882353 Publication ID: 79082
  • Bhujel, N., Tamrakar, U., Hansen, T.M., Byrne, R.H., Tonkoski, R., & Tonkoski, R. (2021). Optimization-Based Estimation of Microgrid Equivalent Parameters for Voltage and Frequency Dynamics [Conference Presenation]. https://doi.org/10.2172/1873066 Publication ID: 78856
  • Poudyal, A., Fourney, R., Tonkoski, R., Hansen, T.M., Tamrakar, U., Trevizan, R.D., & Trevizan, R.D. (2021). Convolutional Neural Network-based Inertia Estimation using Local Frequency Measurements [Conference Poster]. 2020 52nd North American Power Symposium, NAPS 2020. https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85113359103&origin=inward Publication ID: 74703
  • Rauniyar, M., Tamrakar, U., Berg, S., Subedi, S., Hansen, T.M., Fourney, R., Tonkoski, R., & Tonkoski, R. (2021). Evaluation of Probing Signals for Implementing Moving Horizon Inertia Estimation in Microgrids [Conference Presenation]. 2020 52nd North American Power Symposium, NAPS 2020. https://doi.org/10.2172/1863191 Publication ID: 78026
  • Tamrakar, U., Nguyen, T., Byrne, R.H., & Byrne, R.H. (2021). Model Predictive Dispatch of Energy Storage for Voltage Regulation in Active Distribution Systems [Conference Proceeding]. https://doi.org/10.1109/ISIE45552.2021.9576279 Publication ID: 78307
  • Bhujel, N., Tamrakar, U., Hansen, T.M., Tonkoski, R., Byrne, R.H., & Byrne, R.H. (2021). Optimization-Based Estimation of Microgrid Equivalent Parameters for Voltage and Frequency Dynamics [Conference Proceeding]. https://doi.org/10.1109/PowerTech46648.2021.9494858 Publication ID: 78114
  • Bhujel, N., Tamrakar, U., Hansen, T.M., Byrne, R.H., Tonkoski, R., & Tonkoski, R. (2021). Model Predictive Integrated Voltage and Frequency Support in Microgrids [Conference Presenation]. https://doi.org/10.2172/1863192 Publication ID: 78027
  • Poudyal, A., Tamrakar, U., Trevizan, R.D., Fourney, R., Tonkoski, R., Hansen, T.M., & Hansen, T.M. (2021). Convolutional Neural Network-based InertiaEstimation using Local Frequency Measurements [Conference Presenation]. https://doi.org/10.2172/1863187 Publication ID: 78020
  • Bhujel, N., Rai, A., Tamrakar, U., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2021). A Model Predictive Approach for Voltage Support in Microgrids using Energy Storage Systems [Conference Paper]. https://doi.org/10.1109/PESGM46819.2021.9638037 Publication ID: 77328
  • Guruwacharya, N., Bhujel, N., Tamrakar, U., Wilches-Bernal, F., Hansen, T.M., Suryanarayanan, S., Tonkoski, R., & Tonkoski, R. (2021). Modeling Inverters with Grid Support Functions for Power System Dynamics Studies [Conference Presenation]. https://doi.org/10.2172/1841517 Publication ID: 75077
  • Tamrakar, U. (2021). Smart Inverter Functions and Features for Power System Parameter Estimation [Conference Presenation]. https://doi.org/10.2172/1854676 Publication ID: 75058
  • Tamrakar, U., Copp, D.A., Nguyen, T., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2021). Real-Time Estimation of Microgrid Inertia and Damping Constant. IEEE Access, 9, pp. 114523-114534. https://doi.org/10.1109/access.2021.3104516 Publication ID: 79795
  • Tamrakar, U. (2020). Fast Frequency Support in Low Inertia Power System Using Energy Storage [Conference Poster]. https://www.osti.gov/biblio/2002911 Publication ID: 111136
  • Tamrakar, U., Copp, D., Nguyen, T., Hansen, T., Tonkoski, R., & Tonkoski, R. (2020). Fast-Frequency Estimation and Control of Low-Inertia Microgrids [Conference Poster]. https://www.osti.gov/biblio/1821826 Publication ID: 74946
  • Tamrakar, U., Nguyen, T., & Nguyen, T. (2020). Voltage Regulation in Distribution Systems Using Energy Storage [Conference Poster]. https://www.osti.gov/biblio/1820924 Publication ID: 74849
  • Bhujel, N., Tamrakar, U., Hansen, T.M., Byrne, R.H., Tonkoski, R., & Tonkoski, R. (2020). Model Predictive Integrated Voltage and Frequency Support in Microgrids [Conference Poster]. https://www.osti.gov/biblio/1818425 Publication ID: 74707
  • Rauniyar, M., Tamrakar, U., Berg, S., Subedi, S., Hansen, T.M., Fourney, R., Tonkoski, R., & Tonkoski, R. (2020). Evaluation of Probing Signals for Implementing Moving Horizon Estimation in Microgrids [Conference Poster]. https://www.osti.gov/biblio/1818424 Publication ID: 74706
  • Tamrakar, U., Guruwacharya, N., Bhujel, N., Wilches-Bernal, F., Hansen, T.M., Tonkoski, R., & Tonkoski, R. (2020). Inertia estimation in power systems using energy storage and system identification techniques [Conference Poster]. 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020. https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85091177224&origin=inward Publication ID: 73877
Showing 10 of 45 publications.

Patents & Trademarks