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 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, Ph.D.

Publications

Matthew Reno, Michael Ropp, Ujjwol Tamrakar, Rachid Darbali-Zamora, Robert Broderick, (2022). Designing Resilient Communities: Hardware demonstration of resilience nodes concept https://doi.org/10.2172/1902867 Publication ID: 80460

Sunil Subedi, Nischal Guruwacharya, Ujjwol Tamrakar, Phylicia Cicilio, Robert Fourney, Hossein Rekabdarkolaee, Reinaldo Tonkoski, Timothy Hansen , (2021). Computationally Efficient Partitioned Modeling of Inverter Dynamics with Grid Support Functions [Slides] https://doi.org/10.2172/1890911 Publication ID: 76106

Manisha Rauniyar, Niranjan Bhujel, Timothy Hansen, Robert Fourney, Hossein Rekabdarkolaee, Reinaldo Tonkoski, Phylicia Cicilio, Mariko Shirazi, Ujjwol Tamrakar, (2021). Diesel Generator Model Development and Validation using Moving Horizon Estimation IECON Proceedings (Industrial Electronics Conference) https://doi.org/10.1109/IECON48115.2021.9589981 Publication ID: 75934

Sunil Subedi, Nischal Guruwacharya, Robert Fourney, Hossein Rekabdarkolaee, Reinaldo Tonkoski, Timothy Hansen, Ujjwol Tamrakar, Phylicia Cicilio, (2021). Computationally Efficient Partitioned Modeling of Inverter Dynamics with Grid Support Functions IECON Proceedings (Industrial Electronics Conference) https://www.osti.gov/servlets/purl/1890593 Publication ID: 75966

Manisha Rauniyar, Phylicia Cicilio, Ujjwol Tamrakar, Timothy Hansen, Mariko Shirazi, Robert Fourney, Hossein Rekabdarkolaee, Reinaldo Tonkoski, (2021). Diesel Generator Model Development and Validation using Moving Horizon Estimation https://doi.org/10.2172/1890909 Publication ID: 76108

Ujjwol Tamrakar, Tu Nguyen, (2021). Voltage Regulation in Active Distribution Systems Using Energy Storage Systems https://www.osti.gov/servlets/purl/1892143 Publication ID: 76237

Niranjan Bhujel, Ujjwol Tamrakar, Timothy Hansen, Reinaldo Tonkoski, (2021). Optimization-based Voltage Dynamics Estimation and Control of Microgrids https://www.osti.gov/servlets/purl/1892162 Publication ID: 76259

Niranjan Bhujel, Timothy Hansen, Reinaldo Tonkoski, Ujjwol Tamrakar, Raymond Byrne, (2021). Optimization-Based Estimation of Microgrid Equivalent Parameters for Voltage and Frequency Dynamics 2021 IEEE Madrid PowerTech, PowerTech 2021 – Conference Proceedings https://doi.org/10.1109/PowerTech46648.2021.9494858 Publication ID: 78114

Ujjwol Tamrakar, Tu Nguyen, Raymond Byrne, (2021). Model Predictive Dispatch of Energy Storage for Voltage Regulation in Active Distribution Systems IEEE International Symposium on Industrial Electronics https://doi.org/10.1109/ISIE45552.2021.9576279 Publication ID: 78307

Niranjan Bhujel, Ujjwol Tamrakar, Timothy Hansen, Raymond Byrne, Reinaldo Tonkoski, (2021). Optimization-Based Estimation of Microgrid Equivalent Parameters for Voltage and Frequency Dynamics https://doi.org/10.2172/1873066 Publication ID: 78856

Ujjwol Tamrakar, David Copp, Tu Nguyen, Timothy Hansen, Reinaldo Tonkoski, (2021). Optimization-Based Fast-Frequency Estimation and Control of Low-Inertia Microgrids https://doi.org/10.2172/1875246 Publication ID: 79027

Niranjan Bhujel, Astha Rai, Ujjwol Tamrakar, Timothy Hansen, Reinaldo Tonksoki, (2021). A Model Predictive Approach for Voltage Support in Microgrids using Energy Storage Systems https://doi.org/10.2172/1882353 Publication ID: 79082

Ujjwol Tamrakar, Tu Nguyen, Raymond Byrne, (2021). Model Predictive Dispatch of Energy Storage for Voltage Regulation in Active Distribution Systems https://doi.org/10.2172/1870757 Publication ID: 78659

Abodh Poudyal, Robert Fourney, Reinaldo Tonkoski, Timothy Hansen, Ujjwol Tamrakar, Rodrigo Trevizan, (2021). Convolutional Neural Network-based Inertia Estimation using Local Frequency Measurements 2020 52nd North American Power Symposium, NAPS 2020 https://doi.org/10.2172/1863187 Publication ID: 78020

Manisha Rauniyar, Sterling Berg, Sunil Subedi, Timothy Hansen, Robert Fourney, Reinaldo Tonkoski, Ujjwol Tamrakar, (2021). Evaluation of Probing Signals for Implementing Moving Horizon Inertia Estimation in Microgrids 2020 52nd North American Power Symposium, NAPS 2020 https://doi.org/10.2172/1863191 Publication ID: 78026

Niranjan Bhujel, Timothy Hansen, Reinaldo Tonkoski, Ujjwol Tamrakar, Raymond Byrne, (2021). Model Predictive Integrated Voltage and Frequency Support in Microgrids 2020 52nd North American Power Symposium, NAPS 2020 https://doi.org/10.2172/1863192 Publication ID: 78027

Nischal Guruwacharya, Niranjan Bhujel, Timothy Hansen, Siddharth Suryanarayanan, Reinaldo Tonkoski, Ujjwol Tamrakar, Felipe Wilches-Bernal, (2021). Modeling inverters with grid support functions for power system dynamics studies 2021 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2021 https://doi.org/10.2172/1841517 Publication ID: 75077

Niranjan Bhujel, Astha Rai, Timothy Hansen, Reinaldo Tonkoski, Ujjwol Tamrakar, (2021). A Model Predictive Approach for Voltage Support in Microgrids using Energy Storage Systems IEEE Power and Energy Society General Meeting https://doi.org/10.1109/PESGM46819.2021.9638037 Publication ID: 77328

Ujjwol Tamrakar, (2021). Smart Inverter Functions and Features for Power System Parameter Estimation https://doi.org/10.2172/1854676 Publication ID: 75058

Ujjwol Tamrakar, David Copp, Tu Nguyen, Timothy Hansen, Reinaldo Tonkoski, (2021). Real-Time Estimation of Microgrid Inertia and Damping Constant IEEE Access https://doi.org/10.1109/ACCESS.2021.3104516 Publication ID: 79795

Ujjwol Tamrakar, Tu Nguyen, (2020). Voltage Regulation in Distribution Systems Using Energy Storage https://www.osti.gov/servlets/purl/1820924 Publication ID: 74849

Ujjwol Tamrakar, David Copp, Tu Nguyen, Timothy Hansen, Reinaldo Tonkoski, (2020). Fast-Frequency Estimation and Control of Low-Inertia Microgrids https://www.osti.gov/servlets/purl/1821826 Publication ID: 74946

Abodh Poudyal, Robert Fourney, Reinaldo Tonkoski, Timothy Hansen, Ujjwol Tamrakar, Rodrigo Trevizan, (2020). Convolutional Neural Network-based Inertia Estimation using Local Frequency Measurements https://www.osti.gov/servlets/purl/1818421 Publication ID: 74703

Manisha Rauniyar, Ujjwol Tamrakar, Sterling Berg, Sunil Subedi, Timothy Hansen, Robert Fourney, Reinaldo Tonkoski, (2020). Evaluation of Probing Signals for Implementing Moving Horizon Estimation in Microgrids https://www.osti.gov/servlets/purl/1818424 Publication ID: 74706

Niranjan Bhujel, Ujjwol Tamrakar, Timothy Hansen, Raymond Byrne, Reinaldo Tonkoski, (2020). Model Predictive Integrated Voltage and Frequency Support in Microgrids https://www.osti.gov/servlets/purl/1818425 Publication ID: 74707

Ujjwol Tamrakar, Nischal Guruwacharya, Niranjan Bhujel, Felipe Wilches-Bernal, Timothy Hansen, Reinaldo Tonkoski, (2020). Inertia estimation in power systems using energy storage and system identification techniques 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020 https://www.osti.gov/servlets/purl/1804622 Publication ID: 73877

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