Dr. K. Ramachandra Sekhar

Assistant Professor
Electrical Engineering

sekhar@iitrpr.ac.in

Biography

K. Ramachandra Sekhar received the PhD degree from the Department of Electrical Engineering, Indian Institute of Technology Hyderabad.

Areas of Research

1. Design and implementation of high energy density power converters for renewable energy, drives, traction and electric vehicle applications.
2. Electro Magnetic Compatibility (EMC)/ Electro Magnetic Interference (EMI) analysis for high frequency power converters.
3. Methodologies to integrate renewable energy sources with grid / micro grid for efficient energy harvesting.
4. Methodologies to manage the thermal and EMC/EMI aspects in electric vehicles.

Education

Doctor of Philosophy 2009 - 2013 (IIT Hyderabad Registration) (IIT Madras course work and Research)

Work Experience

Researcher, R&D Center, Hitachi India Pvt Ltd, April 2013 to June 2017

Selected Publications/Patents

1. K. R. Sekhar; Srirama Srinivas: 'Torque ripple reduction PWMs for a single DC source powered dual-inverter fed open-end winding Induction motor drive', IET Power Electronics, 2017, "Accepted for Publication"  DOI: 10.1049/iet-pel.2016.0726,IET Digital Library.
2. K.R. Sekhar and S.Srinivas, "Discontinuous Decoupled PWMs for Reduced Current Ripple in a Dual Two-Level Inverter Fed Open-End Winding Induction Motor Drive," IEEE Trans. on Power Electron. , vol.28, no.5, May 2013, pp.2493-2502.  
3. S. Srinivas and K. R. Sekhar, "Theoretical and Experimental Analysis for Current in a Dual-Inverter-Fed Open-End Winding Induction Motor Drive With Reduced Switching PWM," in IEEE Transactions on Industrial Electronics, vol. 60, no. 10,Oct. 2013, pp. 4318- 4328.  
4. K. R. Sekhar, A. Bhatt and T. Kawashima, "A New High Power Solar Inverter Topology with Reduced DC Potential for Enhanced Reliability," PCIM Asia 2017; IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Shanghai, China, 2017, pp. 1-6.
5. P. Patel, K. R. Sekhar and Y. Patel, "A novel control strategy to enhance the current quality in grid tied solar inverter," 2016 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), Trivandrum, 2016, pp. 1-6.
6. K. R. Sekhar, R. Barot, P. Patel and N. V. Kumar, "A novel topology for improved DC bus utilization in PMSG based wind energy generation system," 2015 IEEE International Conference on Renewable Energy Research and Applications (ICRERA), Palermo, 2015, pp. 525-530.
7. K. R. Sekhar, N. V. Kumar and Y. Harada, "Impact of renewable energy control center on voltage stability and transmission network efficiency in wind farm integrated grid," 2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), Mumbai, 2014, pp. 1-6.
8. K. R. Sekhar and S. Srinivas, "Current ripple analysis for an asymmetric dual two-level inverter drive with reduced Common mode voltage PWM technique," 2012 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), Bengaluru, 2012, pp. 1-6.
9. K. R. Sekhar and S. Srinivas, "Effect of a CMV elimination PWM on stator current ripple in a dual two-level inverter fed induction motor drive," IEEE International Symposium on Power Electronics Power Electronics, Electrical Drives, Automation and Motion, Sorrento, 2012, pp. 395-400.
10. J. Kalaiselvi, K. R. Sekhar and S. Srinivas, "Common mode voltage elimination PWMs for a dual two-level VSI with single inverter switching," 2012 IEEE International Symposium on Industrial Electronics, Hangzhou, 2012, pp. 234-239.
11. K. R. Sekhar and S. Srinivas, "Current ripple analysis in a decoupled SVPWM controlled dual two-level inverter fed open-end winding induction motor drive," 2011 IEEE 2nd Power Electronics, Drive Systems and Technologies Conference, Tehran, 2011, pp. 373-378.
12. K. R. Sekhar, S. Mohan and S. Srinivas, "An improved PWM for a dual two-level inverter fed open-end winding induction motor drive," IEEE The XIX International Conference on Electrical Machines - ICEM 2010, Rome, 2010, pp. 1-6.
13. S Srinivas, K R. Sekhar "Hybrid PWM Switching Strategy for a Three-level Inverter fed Induction Motor Drive with Open end winding" AIP Conference Proceedings 1239 (1), 141-147.

 

Patents filed with Hitachi

 1. K.R. Sekhar, N.Vinoth, Y. Harada , "A Inverter for direct current (DC) bus utilization and a method thereof" patent registration number: 926/CHE/2015;  
2. Prashant. P, N.Vinoth, K.R. Sekhar, " Harmonic cancellation unit and method thereof" Patent registration number:IP32570, PCT number 5205/CHE/2015;
3. K.R. Sekhar, R. Rohan "A printed circuit board for reducing common mode current and a method therof" Patent application number: 201641018555;
4. K.R.Sekhar,"A gate drive circuit for switching device and controlling method thereof" Patent application number : yet to receive

Other Information

    • Awards & Honours
  •  1. Received "Academic Excellence Award" in IIT-Hyderabad from Dr.A.P.J.Abdul Kalam (former President of India) for the year 2010-2011.
  • 2. Received "Best Paper Award" for the paper Current ripple analysis in a decoupled SVPWM controlled dual two-level inverter fed open-end winding induction motor drive in IEEE Electronic,Drive Systems &
        Technologies Conference (PEDSTC) held at Tehran, Iran.
  • 3. Received "Best Presentation Award" for the paper Hybrid PWM switching strategy for a three level inverter fed induction motor drive with open end windings in Proceedings of the 3rd Global Conference on  
        Power Control and Optimization Feb-2010.
  • 4. Received "Technology Pioneering Award" for electromagnetic noise analysis of power converter from Hitachi R&D labs Executive General Manager for the year 2014.
    5. Received "Patent Concept Award" for patent idea " Inverter for direct current (DC) bus utilization and a method thereof" from Hitachi R&D labs Executive General Manager for the year 2014.
    6. Received "Best Trouble Shooter" award for the contribution in enhansing the reliability of the 1 MW solar Inverter from Hitachi R&D labs Executive General Manager for the year 2015. 

    7. Received "Hitachi APEC regional award (2016)" for the technical contribution in development of N+1 UPS system in 2016.