Dr. K. Ramachandra Sekhar

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Name: 
Dr. Ramachandra Sekhar
Designation: 
Assistant Professor
Department: 
Electrical Engineering
Email: 

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
Work Experience: 
Researcher, R&D Center, Hitachi India Pvt Ltd, April 2013 to June 2017
Selected Publications/Patents: 

Granted:

1 R Barot, KR Sekhar , "Printed circuit board for reducing common mode current and a method thereof "- US Patent 10,271,422, 2019. (2019) Granted (2019)

2 KR Sekhar, " Circuit for controlling gate current of a semiconductor switching device ", US Patent 10,187,051, 2019. (2019) Granted (2019)

3 Patel Prashant, Kumar Vinoth, KR Sekhar " Harmonic erasure unit and method of harmonic erasure" JP Patent JP2017070186A (2017) Granted (2017)

4 Baibhav Kumar Gupta, Amol ishwarrao Gedam and K. Ramachandra Sekhar "suppressing circulating current through sequential switching of modular inverters in grid applications" Application number- 202011014453, Publication number-41/2021 Granted 464017 (2023)

 Published:

Amol ishwarao Gedam, K.R.C Sekhar" A single stage voltage rectifier circuit for battery charging and a method of operating thereof" 202111016 095 (Indian patent) Published: 24/03/2023

K R C sekhar, Mahesh Reddy, Baibhav Kumar Gupta " System for optimizing  dc voltages of inverter  modules and a method
thereof" 202211021950 (Indian patent) Published: 05/01/2024

Aashish Kumar, Nikhil Kumar, K R Sekhar, " System for optimizing energy in an energy harvesting network and a method thereof"
202211045582 (Indian patent) Published: 16/02/2024

Filed:

Baibhav Kumar Gupta, Amol ishwarrao Gedam, K.R.C.Sekhar, " A Method And System For Performing Adaptive Gain Adjustment
In A Solar Inverter" 202311045914 (Indian patent) Filed: 07/07/2023

Aashish, AI Gedam, Baibhav, Mahesh, Nikhil, Surya, K.R.C.Sekhar, " A smart solar water pumping system" 202411053132 (Indian
patent), Filed:  11/07/2024

Aashish Kumar, K R C Sekhar, "  A Method of tracking maximum power point of a solar farm interfaced grid tied inverter Application" 202411058233 (Indian patent) Filed: 31/7/2024

 

 Journals

A. I. Gedam and K. R. Sekhar, "A Novel Switching Vector Sequencing Method to Optimize DC Voltage Ripple in Dual Inverter Drive Without Affecting Load Current Ripple," in IEEE Transactions on Industrial Electronics, doi: 10.1109/TIE.2024.3376816.

 P. M. Reddy, A. I. Gedam and K. R. Sekhar, "A Solar Series Grid Following Harmonic Compensator with Enhanced Grid Current Shaping and Active Power Injection Capability," in IEEE Transactions on Power Delivery, doi: 10.1109/TPWRD.2024.3369098.

P. M. Reddy, B. K. Gupta and K. R. Sekhar, "Design and Implementation of Load Network Time Constant Computation Based Solar Active Power Filters Cum Injector for Industrial Loads/Grids," in IEEE Access, vol. 12, pp. 19967-19982, 2024, doi: 10.1109/ACCESS.2024.3361309.

A. I. Gedam and K. R. Sekhar, "Minimum DC Voltage Ripple Switching Sequence Elicitation for Dual Inverter Through AC Load Error Volt-Sec Computation," in IEEE Transactions on Power Electronics, vol. 37, no. 12, pp. 15654-15665, Dec. 2022, doi: 10.1109/TPEL.2022.3193886.

B. K. Gupta, K. R. Sekhar and A. Kumar, "A Novel Multigain Single-Stage Grid-Connected Inverter With Asynchronous Switching for Intra-Inverter Circulating Current Elimination," in IEEE Transactions on Power Electronics, vol. 37, no. 12, pp. 15641-15653, Dec. 2022, doi: 10.1109/TPEL.2022.3193566.

B. K. Gupta and K. R. Sekhar, "A Current Controller Gain Characterization of Weak Grid Coupled Solar Inverter Through Impedance Interaction Modeling," in IEEE Transactions on Industrial Electronics, vol. 70, no. 3, pp. 2520-2530, March 2023, doi: 10.1109/TIE.2022.3170633.

B. K. Gupta, K. R. Sekhar and A. I. Gedam, "Solar Interfaced Series Inverter With Provision of Common DC Bus Grounding," in IEEE Transactions on Industrial Electronics, vol. 69, no. 4, pp. 3656-3666, April 2022, doi: 10.1109/TIE.2021.3073303.

 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,  DOI: 10.1049/iet-pel.2016.0726,

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.

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.

 

 

 Conferences:

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.

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.

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.

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.

 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.

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.

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.

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.

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.

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.

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.