[1] Postdoctoral Researcher at National Renewal Energy Laboratory (NREL), USA
▷ Timeline: November 2023 - Present
▷ Responsibility
working in the project “Universal Interoperability for Grid-Forming Inverters (UNIFI): 1M Multi-Vendor Demonstration”, funded by U.S Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office, led by NREL, supervised by Dr. Jing Wang (NREL), Dr. Benjamin Kroposki (Director, Power Systems Engineering Center, NREL).
[1] Demonstrated a centralized secondary control functionality for equal reactive power sharing amongst multiple grid-forming
sources in a large scale experimental 1MW microgrid system in “Energy Systems Integration Facility” (ESIF) at NREL.
[2] Developed smart functionalities such as for microgrid control and operation using centralized python platform and SEL Real
Time Automation Controller (RTAC) Automation Platform.
[3] Demonstrated novel impedance scan analysis on the experimental setup to determine the equivalent impedance of various types
of grid-forming and grid-following inverters, diesel generator sets.
[4] Demonstrated innovative operation of 1MW large scale microgrids consists of both 3-phase and 1-phase inverters such as smart
resynchronization, seamless on-grid to off-grid transitions etc.
working in the project “Protection of Inverter-Dependent Transmission Systems”, funded by U.S Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office, led by NREL, supervised by Dr. Jing Wang (NREL), Dr. Andy Hoke (NREL).
[1] Developed a benchmark generic grid-following inverter-based resource EMT model using PSCAD platform that facilitates various
types of DC sources (ideal DC source, PV sources, batteries), various types of control (conventional DQ control, conventional
alpha-beta control, dual vector based sequence domain control), various protection scheme (current saturation limiter, current
latching limiter, anti-windup protections).
[2] Developed a benchmark generic grid-forming inverter-based resource EMT model using PSCAD platform that facilitates various types
of DC sources (ideal DC source, PV sources, batteries), various types of control (conventional double-loop DQ control,
conventional single-loop DQ control, conventional alpha-beta control, dual vector based sequence domain control), various
protection scheme (virtual impedance based limiter, current saturation limiter, current latching limiter, anti-windup
protections).
[3] Investigate the impacts of various control systems of GFL-IBRs and GFM-IBRs on the transmission system protection schemes such
as negative sequence directional element, differential protection, distance relays. Closely worked with University of Idaho and
Idaho National Laboratory, Kaua'i Island Utility Cooperative.
[2] Graduate Research Assistant at University of Minnesota, Twin Cities, USA
▷ Timeline: August 2018- May 2023
▷ Responsibility
worked in the project “Rapidly Viable and Sustained Grid”, funded by Advanced Research Projects Agency Energy (ARPA-E), supervised by Prof. Murti V. Salapaka.
[1] Developed a medium power microgrid, two in-lab designed 1-phase, 240V, 2kVA programmable inverters (compatible for grid-
following as well as grid-forming operation), two electronics loads each 4kVA rated, a grid simulator with 10kVA rating.
[2] Developed a robust power hardware-in-the-loop system to interface the microgrid with OP5700-based real-time simulator.
[3] Developed a generalized controller hardware-in-the-loop platform with TMS320F28379D micro-controller interfaced with
OP5700-based real-time simulator.
[4] Developed novel proposals such as seamless transition, black start and distributed power apportioning, and emergency power
supply system capability of microgrid systems based on 3-phase, 480V, 700kW University of Minnesota Fairview Medical Center
building network.
[5] Delivered all Tech-to-Market goals with University of Minnesota Fairview Medical Center, National Renewable Energy
Laboratory, Cordova Community Medical Center, Golden Valley Electric Association.
worked in the project “Enabling the Grid of the Future”, funded by Advanced Research Projects Agency-Energy (ARPA-E), supervised by Prof. Murti V. Salapaka.
[1] Developed an isochronous voltage-active-based half droop control for low power microgrid with two in-lab designed 1-phase,
110V, 0.6kVA programmable inverters (compatible for grid following as well as grid-forming operation).
[2] Developed a robust virtual impedance based harmonic power sharing methodology for 1-phase, 110V, 0.6kVA programmable
inverter using OP5700-based real-time simulator.
[3] Junior Research Fellow at Indian Institute of Science, Bangalore, India
▷ Timeline: July 2016 - May 2018
▷ Responsibility
led the project “Development of Protection Scheme for AC Microgrid”, funded by Science and Engineering Research Board (SERB) under the Department of Science and Technology (DST), Government of India under supervision of Prof. Sarasij Das, Dept. of Electrical Engineering, Indian Institute of Science, Bangalore.
[1] Develop network protection scheme for solving the existing protection issues related to the AC microgrids compatible for
both grid connected and islanded operations with the aim of minimizing the use of communication networks, and to detect
both low and high impedance faults and to keep the fault clearing time within acceptable range.
[2] Developed test systems for microgrid using PSCAD/EMTDC software for theoretical investigation. That includes medium voltage
18- bus microgrid system and modified IEEE-13 bus system, fully capable of operating in grid-tied and islanded mode with
novel protection schemes
[3] Developed two stage hardware setups for experimental investigations. Important equipment used for the design are NI based
myRIO 1900, 433 MHz Radio Frequency (RF) modules, TMS320F28335 Delfino DSP evaluation board, commercial single-phase Energy
Meter (EM) EVM430-F6736(A), Omicron real time playback simulator CMC 256 plus, and assembled computers.