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Prof. L Umanand

Our Instructor

Prof. L Umanand

  • Responsibility: Assistant Professor
  • Email: lums@dese.iisc.ernet.in
  • Years in IISc: 36 years
  • Total PhDs Graduated: 53
  • Total Journal Papers: 200
  • Total Conference Papers: 196
  • Total Patents: 6

Research Thrust

Power Electronics Group at the Department of Electronics system Engineering IISc is working in the areas of Industrial drives, micro-grids, renewables and power electronic applications to power systems. The research carried out by the group includes analysis, modeling, simulation, control, design, fabrication, reliability calculation and evaluation of power electronic systems over a wide range of power levels. The group interacts closely with industries and universities inside and outside India.

Top 20% Publications

  1. V. T. Somasekhar, K. Gopakumar, M. R. Baiju, K. K. Mohapatra, and L. Umanand, “A Multilevel Inverter System for an Induction Motor With Open-End Windings,” IEEE Transactions on Industrial Electronics, vol. 52, no. 3, pp. 824–836, Jun. 2005, doi: https://doi.org/10.1109/tie.2005.847584.
  2. K. K. Mohapatra, K. Gopakumar, V. T. Somasekhar, and L. Umanand, “A harmonic elimination and suppression scheme for an open-end winding induction motor drive,” IEEE Transactions on Industrial Electronics, vol. 50, no. 6, pp. 1187–1198, Dec. 2003, doi: https://doi.org/10.1109/tie.2003.819670.
  3. T. Bhattacharya, V. S. Giri, K. Mathew, and L. Umanand, “Multiphase Bidirectional Flyback Converter Topology for Hybrid Electric Vehicles,” IEEE Transactions on Industrial Electronics, vol. 56, no. 1, pp. 78–84, Jan. 2009, doi: https://doi.org/10.1109/tie.2008.2004661.
  4. E. G. Shivakumar, V. T. Somasekhar, K. K. Mohapatra, K. Gopakumar, L. Umanand, and S. K. Sinha, “A multi level space phasor based PWM strategy for an open-end winding induction motor drive using two inverters with different DC link voltages,” 4th IEEE International Conference on Power Electronics and Drive Systems. IEEE PEDS 2001 - Indonesia. Proceedings (Cat. No.01TH8594), vol. 1, pp. 169–175, 2026, doi: https://doi.org/10.1109/peds.2001.975306.
  5. B. Satish Naik, L. Umanand, K. Gopakumar, and B. Subba Reddy, “A Two-Phase Five-Level Converter With Least Number of Power Switches Requiring Only a Single DC Source,” IEEE journal of emerging and selected topics in power electronics, vol. 6, no. 4, pp. 1942–1952, Dec. 2018, doi: https://doi.org/10.1109/jestpe.2018.2791403.
  6. K. Mathew, K. Gopakumar, J. Mathew, N. A. Azeez, A. Dey, and L. Umanand, “Medium Voltage Drive for Induction Motors Using Multilevel Octadecagonal Voltage Space Vectors,” IEEE Transactions on Power Electronics, vol. 28, no. 7, pp. 3573–3580, Jul. 2013, doi: https://doi.org/10.1109/tpel.2012.2227507.
  7. G. A. Raiker, B Subba Reddy, L. Umanand, A. Yadav, and M. M. Shaikh, “Approach to Non-Intrusive Load Monitoring using Factorial Hidden Markov Model,” 2018 IEEE 13th International Conference on Industrial and Information Systems (ICIIS), Dec. 2018, doi: https://doi.org/10.1109/iciinfs.2018.8721436.
  8. Mathews Boby, Sumit Pramanick, R. Sudharshan Kaarthik, S. Arun Rahul, K. Gopakumar, and L. Umanand, “Multilevel Dodecagonal Voltage Space Vector Structure Generation for Open-End Winding IM Using a Single DC Source,” IEEE Transactions on Industrial Electronics, vol. 63, no. 5, pp. 2757–2765, May 2016, doi: https://doi.org/10.1109/tie.2015.2511162.
  9. S. Roy and L. Umanand, “Integrated Magnetics-Based Multisource Quality AC Power Supply,” IEEE Transactions on Industrial Electronics, vol. 58, no. 4, pp. 1350–1358, Apr. 2011, doi: https://doi.org/10.1109/tie.2010.2049712.
  10. G. A. Raiker et al., “Internet of Things based Demand Side Energy Management System using Non-Intrusive Load Monitoring,” IEEE Xplore, Jan. 01, 2020. https://ieeexplore.ieee.org/document/9070739.
  11. Mathews Boby, Arun Rahul S, K. Gopakumar, L. Umanand, Frede Blaabjerg, and S. Bhattacharya, “A Low-Order Harmonic Elimination Scheme for Induction Motor Drives Using a Multilevel Octadecagonal Space Vector Structure With a Single DC Source,” IEEE Transactions on Power Electronics, vol. 33, no. 3, pp. 2430–2437, Mar. 2018, doi: https://doi.org/10.1109/tpel.2017.2695660.
  12. B. S. Naik, L. Umanand, K. Gopakumar, and B. S. Reddy, “A New Two-Phase Five-Level Converter for Three-Phase Isolated Grid-Tied Systems With Inherent Capacitor Balancing and Reduced Component Count,” IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. 6, no. 3, pp. 1325–1335, Feb. 2018, doi: https://doi.org/10.1109/jestpe.2018.2805520.
  13. V. M. Mistry, S. P. Waikar, K. Gopakumar, L. Umanand, and V. T. Ranganathan, “A multi axis space phasor based current hysteresis controller for PWM inverters,” Proceedings of Second International Conference on Power Electronics and Drive Systems, vol. 1, pp. 480–486, 2026, doi: https://doi.org/10.1109/peds.1997.618751.
  14. K. K. Mohapatra, K. Gopakumar, V. T. Somasekhar, and L. Umanand, “A novel modulation scheme for a six phase induction motor with open-end windings,” IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02, vol. 1, pp. 810–815, 2026, doi: https://doi.org/10.1109/iecon.2002.1187612.
  15. None Rohith, L. Umanand, and Subba Reddy B, “Pole Changing Wide Speed Range Induction Motor Drive for Electric Vehicles,” NOT FOUND REPOSITORY (Indian Institute of Science Bangalore), Dec. 2018, doi: https://doi.org/10.1109/pedes.2018.8707677.
  16. M.R. Baiju, K. K. Mohapatra, V.T. Somasekhar, K. Gopakumar, and L. Umanand, “A five-level inverter voltage space phasor generation for an open-end winding induction motor drive,” Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2003. APEC ’03, vol. 2, pp. 826–832, Feb. 2004, doi: https://doi.org/10.1109/apec.2003.1179312.
  17. M. Imthias, K. R. R, A. K. Yadav, K. Gopakumar, L. Umanand, and C. Cecati, “Minimization of Switched Capacitor Voltage Ripple in a Multilevel Dodecagonal Voltage Space Vector Structure for Drives,” IEEE Transactions on Industrial Electronics, vol. 67, no. 1, pp. 126–135, Feb. 2019, doi: https://doi.org/10.1109/tie.2019.2893825.
  18. T. Debnath, K. Gopakumar, L. Umanand, D. Zielinski, and K. Rajashekara, “A Nine-Level Inverter With Single DC-Link and Low-Voltage Capacitors as Stacked Voltage Sources With Capacitor Voltage Control Irrespective of Load Power Factor,” IEEE Open Journal of the Industrial Electronics Society, vol. 3, pp. 522–536, 2022, doi: https://doi.org/10.1109/ojies.2022.3209333.
  19. B. S. Naik, S. Shan, L. Umanand, and B. S. Reddy, “A Novel Wide Duty Cycle Range Wide Band High Frequency Isolated Gate Driver for Power Converters,” IEEE Transactions on Industry Applications, vol. 54, no. 1, pp. 437–446, Oct. 2017, doi: https://doi.org/10.1109/tia.2017.2764850.

Patents and Stats