**Prof. K. Gopakumar, Professor**

Department of Electronic Systems Engineering (Formerly CEDT)

Indian Institute of Science (IISc) , Bangalore 560012

Dr. K. Gopakumar received his B.E. (Electrical Engineering) degree from Indian Institute of Science in 1980. Later on he did his M. Sc. (Engg.) (E.E.) in 1984 and Ph.D. (E.E.) in 1994 both from the Indian Institute of Science respectively. His thesis title for M.Sc. was “A Series Dual Current Source Inverter fed Split-Phase Induction Motor Drive” and thesis title for Ph.D. was “Study on Voltage Source Inverter fed Drives for Induction Motor with Split Phase Windings”.

Dr. Gopakumar is currently a Professor at the Department of Electronic sytems Engineering

( formerly CEDT- Centre for Electronics Design and Technology) at Indian Institute of Science (IISc), Bangalore, India. He is also the member of the following professional bodies :-

Fellow IEEE

Fellow IETE (India)

Fellow Indian National academy of Engineers (FNAE)

Co Editor-in-Chief IEEE Trans. On Industrial Electronics.

IETE (India)- B.K Bose award for contributions to the area of power electronics and drives for high power applications

Distinguished Lecturer-IEEE Industrial Electronics Society

IISc Alumni award for Excellence in Research in Engineering-2016

ABB Chair professor 2016 -2018

**Professional Experience – 27 years**

1984-1987: During this period, Dr. K. Gopakumar was employed by the Indian Space Research Organisation, Satellite Centre, Bangalore, India. The nature of the work was to design and develop satellite on board power supply systems. During this period he was fully involved in the design, development and testing of the SROSS-1 (Stretched Rohini Satellite Series-1) main power supply systems (switched mode power supply systems) for the controls and payloads.

From 1987 onwards: employed at CEDT, Indian Institute of Science, Bangalore, India.

- 1987 to 1993: Scientific Officer,
- 1993 to 1997: Senior Scientific officer,
- 1997 to 2003: Assistant Professor
- 2003 to 2007: Associate Professor
- 2007 onwards: Professor

Major Consultancy Projects

Design and Development activities at CEDT are always according to the industrial requirements and as a result Dr. K. Gopakumar has associated with the following consultancy projects.

**A four quadrant digital controller design for a DC drive**Consulting firm – NGEF Ltd. -Duration (Oct. – 93 to June – 95) The task was to design and develop, the speed and current control loop, converter control circuit for four quadrant operation, field converter control circuit and the monitoring and protection circuit**Sensorless speed control of induction motor**– Consulting firm – Infosys Technologies Ltd. (July – 94 to Aug. – 95) The task was to give technical advise on a high performance drive control scheme using terminal voltage and current measurements only**General purpose power converter, controller using single chip microcontrollers**. Consulting firm – BHEL. (Aug. – 93 to May – 95). The task was to design and develop a converter control circuit using 80C 196 microcontroller**AC variable speed drive**– Consulting firm – JVS Electronic Ltd. (Oct. – 94 – Mar. – 96). The task is to give design details, including the appropriate circuit diagrams for a 5hp induction motor inverter power circuit and the controllers**Variable frequency AC drive for induction motor. – IPA Pvt. Ltd.**(Nov. – 94 – Mar – 96) The task is to design and develop a variable speed induction motor inverter drive control and protection circuits**3KVA on line UPS. – Foresight Power Systems Pvt. Ltd.**(Feb. – 95 -Apr. 96). This involves the design and development of the battery charger, inverter and the filter circuits with appropriate control and protection circuits.**Feasibility study for Electric Three – Wheeler Vehicles. DASAG Energy Engineering Ltd. Seuzach, Switzerland, – (Jan. – 96)****A Regenerative Electronic load**;Here the three phase out put is rectified and then fed to the mains through a phase controlled converter in the inversion mode. The project is completed and is funded by the Department of electronics, Govt. of India.**Studies on Multi level inverter fed Induction motor drive schemes with common mode voltage elimination for Induction motor drives**:Department of Science and Technology-2004**Control and drive developments for a four wheeler EV**: Development of the DSP platform and design and development of a sensorless field oriented control algorithm for the induction motor drive: the project is funded by General Motors, USA-June-2005**A five-level inverter scheme with common mode voltage suppression and DC link capacitor balancing for induction motor drives for high power applications by cascading two-level an dthree-level inverter structures-**:Department of Science and Technology-2006-20Lakhs**A multi-level 12-sided polygonal voltage space vector structure for high power induction motor drive applications by cascading the conventional two-level and three-level inverters.**: – Department of Science and Technology-2008.-30lakhs**Design and development of a three-level inverter for aircraft applications-**: Honeywell India- Rs.15 Lakhs

List of Publications – Journal

- A Very High Resolution Stacked Multilevel Inverter Topology for Adjustable Speed Drives Viju Nair R, K. Gopakumar, Fellow, IEEE, Leopoldo G. Franquelo, Fellow, IEEE,
**accepted IEEE Transactions on industrial Electronics,2017** - A Low Order Harmonic Elimination Scheme For Induction Motor Drives Using a Multilevel Octadecagonal Space Vector Structure With a Single DC Source;Mathews Boby;K.Gopakumar; Arun Rahul; Umanand; Subhashish. Bhattacharya; frede Blaabjerg,
**accepted IEEE Transactions on industrial Electronics,2017** - A 24 sided volatge space vector based IM drive with low order harmonic elimination for the full speed range;Krishna Raj; K.Gopakumar ;Mathews Boby;Mariusz malinowski; Marek jasenki,
**accepted IEEE Transactions on industrial Electronics,2017** - Novel symmetric six phase induction motor drive using stacked multilevel inverters witha single DC link and neutral point voltage balancing;Viju Nair;Arun rahul.S;Sumit Pramanick K. Gopakumar; Leopoldo Franquelo,
**IEEE Transactions on industrial Electronics, Vol.64,no.4,: PP.2663-2670, April.2017.** - Extending the Linear Modulation Range to the Full Base Speed Using a Single DC Link Multilevel Inverter with Capacitor Fed H-Bridges for IM drives;Arun R. S.; Sumit Pramanick; R.S. Kaarthik; K. Gopakumar; Frede Blaabjerg,
**IEEE Transactions on Power Electronics,, Vol.32,no.7, PP.5450-5458,July.2017.** - Low Switch Count Nine Level Inverter Topology for Open End Induction Motor Drives; A. Kshirsagar; R. S. Kaarthik; K. Gopakumar; L. Umanand; K. Rajashekara,
**IEEE Transactions on Industrial Electronics,Vol.64,no.2 PP.1009-1017, Feb.2017.** - Extended Linear Modulation Operation of a Common Mode Voltage Eliminated Cascaded Multilevel Inverter with a Single DC supply; Arun Rahul S; Sumit Pramanick; Mathews Boby; K. Gopakumar; Leopoldo G. Franquelo .
**IEEE Transactions on Industrial Electronics,Vol.32,no.7 PP.5450-5458,Jul.2017.** - A Harmonic Suppression Scheme for Full Speed Range of a Two Level Inverter Fed Induction Motor Drive using Switched Capacitive Filter; Sumit Pramanick; Sudharshan Kaarthik; Najath Abdulazeez; K. Gopakumar; Sheldon Williamson; Kaushik Rajashekara.
**IEEE Transactions on Power Electronics,Vol.32,no.3, PP.2064-2071, march.2017.** - Generation of Higher Number of Voltage Levels by Stacking Inverters of Lower Multilevel Structures with Low Voltage Devices for Drives ; Viju Nair R., Arun Rahul S., Kaarthik S., Kshirsagar A. and Gopakumar K..
**IEEE Transactions on Power Electronics,Vol.32,no.1 PP.52-59,Jan.2017.** - Fifth and Seventh Order Harmonic Elimination with Multilevel Dodecagonal Voltage Space Vector Structure for IM Drive Using a Single DC Source for the Full Speed Range ; Boby M., Pramanick S., Kaarthik S., Rahul S.A., Umanand L. and Gopakumar K..
**IEEE Transactions on Power Electronics,Vol.32,no.1 PP.60-68, Jan.2017** - A Predictive Capacitor Voltage Control of a Hybrid Cascaded Multilevel Inverter With a Single DC link and With Reduced Common Mode Voltage Operation; Arun Rahul S; Sudharshan Kaarthik; K. Gopakumar; Leopoldo G. Franquelo; Jose I. Leon..
**IEEE Transactions on Industrial Electronics,Vol.63,no.8, PP.5285-5292, Aug.2016.** - A 3-Level Dodecagonal Space Vector based Harmonic Suppression Scheme for Open-End Winding IM Drives with Single DC Supply ; Pramanick S., Boby M., Najath Abdul Azeez, Gopakumar K. and Williamson S.
**IEEE Transactions on Industrial Electronics,Vol.63.no.11, PP.7226-7233, Nov.2016.** - Multilevel Dodecagonal Voltage Space Vector Structure Generation for Open-end Winding IM using a Single DC Source ; Boby M.,Pramanick S., Kaarthik S., Rahul S. A., Umanand L. and K. Gopakumar.
**IEEE Transactions on Industrial Electronics,Vol.63,no.5 PP.2757-2765 , May-2016.** - Timing calculations for a general N-level dodecagonal space vector structure using only reference phase voltages; R. Sudharshan Kaarthik, K. Gopakumar, Carlo Cecati and Istvan Nagy..
**IEEE Transactions on Industrial Electronics,Vol-63, no.3,pp.1395-1403,March- 2016.** - Reduced common-mode voltage operation of a new seven-level hybrid multilevel inverter topology with a single DC voltage source ; Arun Rahul Sanjeevan, R. Sudharshan Kaarthik, K. Gopakumar, P.P. Rajeevan, Jose I. Leon, Leopoldo G. Franquelo..
**IET Transactions on Power Electronics,vol.9,No.3,pp.519-528,3.9 2016.** - A Voltage Space Vector Diagram formed by Ninteen Concentric Do decagons for Medium Voltage Induction Motor Drives. Sudharshan Kaarthik ; Gopakumar, K. ; Cecati, C; Istvan nagy.
**IEEE Transactions on Industrial Electronics, Volume-62, no.11,pp.6748-6755, Nov. 2015.** - Low Order Harmonic Suppression for Open-end Winding IM with Dodecagonal Space Vector using a Single DC-link Supply. Pramanick, S. ; Abdul Azeez, N. ; Kaarthik, S. ; Gopakumar, K. ; Cecati, C..
**IEEE Transactions on Industrial Electronics, Volume 62,no.9,pp 5340-5347, Sep. 2015.** - Medium Voltage Drive for Induction Machine with Multilevel Dodecagonal Voltage Space Vectors with Symmetric triangles. Sudharshan Kaarthik; Gopakumar, K; Mathew, J. ; Undeland, T.
**IEEE Transactions on Industrial Electronics, Volume-62, Page-79-87, Issue: 1,2015** - A Seventeen-Level Inverter formed by Cascading Flying Capacitor and Floating Capacitor H-bridges. Roshan Kumar, P. ; Sudharshan Kaarthik ; Gopakumar, K. ; Leon, J.I. ; Franquelo, L.G..
**IEEE Transactions on Power Electronics, Volume: 30, Page(s): 3471-3478, Issue: 7,2015** - A Harmonic Suppression Scheme for Open-End Winding Split-Phase IM Drive Using Capacitive Filters, For The Full Speed Range; Najath Abdul Azeez,K Gopakumar,and Carlo Cecati
**IEEE Transactions on IE, Vol-61,issue 10,pp 5213-5221, -2014** - Hysteresis current controller for a general n-level inverter fed drive with online current error boundary computation and nearly constant switching frequency; Anubrata Dey,Najath Abdul Azeez, K.Mathew, K Gopakumar, Marian P Kazmierkowski
**IET Power Electron.,Vol.6,No.8 pp. 1640-1649,Sept.2013** - A Three-level Common-mode Voltage Eliminated Inverter With Single DC-Supply Using Flying Capacitor Inverter and Cascaded H-Bridge ; Roshan Kumar, K.Mathew, K Gopakumar, Jose leon and Leopoldo Franquelo
**IEEE Trans On PELs,Vol.29,No.3,pp1402-1409,March -2014** - A Medium Voltage Inverter Fed IM Drive using Multilevel 12-sided polygonal Vectors, with Nearly Constant Switching Frequency Current Hysteresis Controller ; Najath Abdul Azeez,Anubrata Dey, K.Mathew, K Gopakumar and Marian Kazmierkowski
**IEEE Trans On IE,Vol.61,no.4,pp 1700-1709,April-2014** - A nearly constant switching frequency Current Error Space Vector Based Hysteresis Controller for an IM drive with 12-sided polygonal voltage space vectors , Najath Abdul Azeez,Anubrata Dey, K.Mathew,Jaison mathew,and K Gopakumar
**EPE Journal, Volume: 23-4, 2013** - A Reduced Device-Count Hybrid Multilevel Inverter Topology with single DC Source andImproved Fault Tolerance “,,Rajeevan P.P,and K Gopakumar
**EPE Journal,Vol.23,no.2,pp-14-23,June-2013** - Nearly Constant Switching Frequency Hysteresis Current controller with fast online computation Of Boundary for a 2-level VSI Fed IM”,,Anubrata Dey ,K Mathew,K Gopakumar,and Marian P Kazmierkowski
**EPE Journal,Vol23,No.3,2013** - Multilevel Dodecagonal Space Vector Generation for Induction Motor Drives by Cascading 3 Level and 2 Level Inverters “,K Mathew, Jaison Mathew, Najath Abdul Azeez, Anubrata Dey, L Umanand,K Gopakumar ,
**IET Power Electronics,vol.5,no.8,2012,pp.1324-1332** - A hybrid multilevel inverter system based on dodecagonal space vectors for medium voltage IM drives “,Jaison Mathew, Member IEEE, Mathew K., Najath Abdul Azeez and Gopakumar K ,
**IEEE Transactions on Power Electronics,vol.28,no.8,2013,pp.3723-3732.** - Medium Voltage Drive for Induction Motors using Multilevel Octadecagonal Voltage Space Vectors “,K Mathew, Jaison Mathew, Najath Abdul Azeez, Anubrata Dey, L Umanand, K Gopakumar ,
**IEEE Transactions on Industry Trans. On Power Electronics,vol.28,n0.7,2013,pp.3570-3583** - A Hybrid Five-level Inverter with Common Mode Voltage Elimination having Single Voltage Source for IM Drive Applications”,Rajeevan P.P,K.Gopakumar,
**IEEE Transactions on Industry Applications,vol.48,n0.6,2012,pp.2037-2047.** - A Nine-Level Inverter Topology for Medium Voltage Induction Motor Drive with Open-end Stator Winding”,Rajeevan P.P,sivakumar,K.Gopakumar,Chintan Patel, Abu-rub haitham
**IEEE Transactions on Industrial Electronics,vol.60,no.9,pp.3627-3636-2013** - A Space Vector based Hysteresis Current Controller for a General n-level Inverter Fed Drive with Nearly Constant Switching Frequency Control”,Anubrata Dey, Rajeevan P.P,Rijil Ramchand, Mathew.K,K.Gopakumar,
**IEEE Transactions on Inductrial Electronics,vol.60,no.5,2013,pp.1989-1998** - A Multilevel inverter scheme with dodecagonalvoltage space vectors based on flying capacitor topology for induction motor drives,Jaison Mathew,Rajeevan P.P,K.Mathew,Najath Abdul Azeez, K.Gopakumar,
**IEEE Transactions on Power Electronics,vol.8,no.1,2013,pp.516-523.** - A five level inverter topology with single DC-power suply by cascading aflying capacitor inverter and an H-bridge, P.Roshan Kumar,Rajeevan P.P,K.Mathew, K.Gopakumar, Jose.I Leon, Leopoldo G Franquelo,
**IEEE Transactions on Power Electronics,Vol.27,No.8,Aug2012,pp.3505-3513** - Fast Direct Torque Control of Open-end Induction Motor Drive using 12-sided Polygonal Voltage Space Vectors,Chintan Patel,Rajeevan P.P,Anubrata Dey K.Gopakumar, and Marian P Kazmierkowski, K. Sivakumar,
**IEEE Transactions on IE,Vol.27,NO.1,Jan,2012,pp.400-410** - Low Inductance Axial Flux BLDC Motor Drive for More Electric Aircraft, K.Gopakumar,Sukumar De, K. Sivakumar,
**IET Power Electronics , Vol.5,Issue.1,2012,pp.124-133.** - Online Computation of Hysteresis Boundary for Constant Switching Frequency Current Error Space Vector Based Hysteresis Controller for VSI fed IM Drives,Rijil Ramchand, K. Gopakumar,Chintan Patel, K. Sivakumar, Anandarup Das and Abu-Rub Haitham
**IEEE Trans on PELs,Vol.23,NO.3,2012,pp.1521-1529.** - An asymmetric cascaded H-Bridge inverters for generating 12-sided polygonal space vector diagrams for Motor drives,Mathew.K,Anandarup Das,Chintan Patel,Rijil Ramchand, Gopakumar.K
**EPE Journal,Vol 21 no 1,2011** - A Seven-level Inverter topology for IM Drive using Two-level Inverters and Floating Capacitor Fed H-Bridges,Rajeevan P.P,K.Sivakumar,Chintan Patel,Rijil Ramchand, Gopakumar.K
**IEEE Trans.on Power electronics,Vol.26,Issue.6,2012,pp.1733-1740.** - Multilevel inverters for low power applications,Sukumar De, Debmalya Banerjee ,K.Sivakumar,Chintan Patel,Rijil Ramchand,Gopakumar.K
**IET, Power electronics,Vol4,Iss.4,pp.384-392,2011** - A rotor flux estimation during zero and active vector periods using current error space vector from a hysteresis controller for a sensorless vector control of IM drve , Chintan Patel,Rijil Ramchand,K.Sivakumar, Anandarup Das,Gopakumar.K
**IEEE Trans. On Industrial Electronics,Vol.58,No.6,June 2011** - Reecent Advances and Industrial Applications of Multilevel converters ,Samir Kouro,Mariusz Malinowski,M.Perez,J I Leon,Gopakumar.K,Joseph Pou,L.G Franquelo,Bin Wu,and Jose Rodriguez
**IEEE Trans. On Industrial Electronics,Vol.57,n0.8,Aug-2010,pp2553-2580** - A hybrid multilevel inverter topology for an open-end winding IM drive using two-level inverters in series with a capaciotr fed H-bridge cell ,K.Sivakumar,Anandarup Das, Rjil Ramchand,Chintan Patel,and K.Gopakumar
**IEEE Trans. On Industrial Electronics,Vol.57,no.11,Nov.2010,pp.3707-3815** - A Volatge space vector structure formed by six concentric dodecagons for IM drives. , Anandarup Das,and K.Gopakumar,
**IEEE Trans. on Power electronics,Vol25,no.6,June 2010,pp1480 – 1487** - Two different schemes for three level voltage space vector generation for induction motor drives with reduced DC link Voltage,K.Sivakumar,Anandarup Das,Rjil Ramchand,Chintan Patel,and K.Gopakumar,
**EPE( European power electronics journal),vol.20,no.1,March2010,pp5-12** - A survey on cascaded multilevel inverters ,Mariusz Malinowski,K.Gopakumar,Jose Rodriguez and Marcelo Perez,
**IEEE Trans. On Industrial Electronics-Vol.1, No.1,Dec.2009** - A fivelevel inverter scheme for a four pole induction motor drive by feeding the identical volatge profile windings from both sides ,K.Sivakumar,Anandarup Das, Rjil Ramchand,Chintan Patel,and K.Gopakumar
**IEEE Trans. On Industrial Electronics,Vol.57,no.8,pp.2776-2784,2010.** - Improved Switching Frequency Variation Control of Hysteresis Controlled VSI Fed IM Drives Using Current Error Space Vector ,Rijil Ramchand,K.Sivakumar,Anandarup Das, Chintan Patel,and K.Gopakumar
**IET Power Electronics,Vol.3,No.2,pp.219-231,March 2010** - A Five level inverter scheme for an open end winding induction machine with less number of switches ,Sheron Figarado,K.Sivakumar,Rijil Ramchand,Anandarup Das, Chintan Patel,and K.Gopakumar
**IET Power Electronics,Vol.3,Iss.4,pp637-647-2010** - A Pulse Width Modulated control of Induction Motor drive using multilevel 12-sided polygonal volatge space vectors ,Anandarup Das,K.Sivakumar,P.Chintan, Rijil Ramchand, and K.Gopakumar
**IEEE Trans. On Industrial Electronics,Vol.56,No.7,July 2009** - A DC-link Capacitor Voltage Balancing with CMV Elimination using only the Switching State Redundancies fora Reduced Switch Count Multi-Level Inverter fed IM Drive, Gopal Mondal, Rijil Ramchand,F.sheron,and K.Gopakumar
**EPE( European power electronics journal),Vol.19,N0.1, March-2009** - A dual seven level inverter supply for an open-end winding induction motor drive, Gopal Mondal,K. Gopakumar,Rijil Ramchand,Emil Levi
**IEEE Trans.on IE.Vol.56,no.5,May-2009,pp.1665-1673.** - A combination of Hexagonal and 12-sided polygonal voltage space vector PWM control for Im drives using cascaded two level inverters, Anandarup das,K. Sivakumar, Rijil Ramchand,Chintan Patel, and K.Gopakumar
**IEEE Trans. on IE,Vol.56,NO.5,May 2009.** - Neutral point balancing of NPC three-level inverter with a front end switched rectifier DC source for the full modulation range, K. Sivakumar,Sukumar De,K.Gopakumar, Gopal Mondal,Keith Corzine,
**IET Proceedings – Electric Power Applications,2008** - Three level inverter scheme with reduced power devise count for an induction motor drive with coomn mode voltage elimination, Sheron Figarado, Tanmoy Bhattacharya, Gopal Mondal, and K. Gopakumar,
**IET Power Electronics -2008, vol.1, no.1, pp. 84-92, U.K.** - An 18-sided polygonal voltage space vector based PWM control for an induction motor drive, Sanjay Lakshminarayanan, K. Gopakumar,
**IET Proceedings – Electric Power Applications, 2008, 2, (1), pp. 56-63, U.K** - Twelve-sided polygonal voltage space vector based multi level inverter for an induction motor drive with common mode voltage elimination, Sanjay Lakshminarayanan, Gopal Mondal, P. N. Tekwani,K.K Mohapatra and K. Gopakumar,
**IEEE trans. ON IE vol.54,no.3, October 2007.pp 2761-2768.**. - A reduced switch count five-level inverter with common-mode voltage elimination for an open-end winding induction motor drive; Gopal Mondal, K. Gopakumar, P.N. Tekwani, E. Levi, –
**IEEE Trans. on IE vol.54,no.4,August 2007.pp 2344-2351**. - Linearization of the multi-level SVPWM signal generation in the over-modulation region extending up to six-step mode using only the sampled amplitudes of reference phase voltages; R.S Kanchan, P.N Tekwani and K.Gopakumar-
**EPE JournalVol.17,no.2,June-2007**. - A five-level inverter topology with common-mode voltage elimination for induction motor drives, P. N. Tekwani, R. S. Kanchan, and K. Gopakumar,
**European Power Electronics (EPE) Journal vol.17,no.1, March 2007.pp 11-23**, Brussels, Belgium. - Five-level inverter scheme for an induction motor drive with simultaneous elimination of common-mode voltage and dc-link capacitor voltage unbalance- P.N Tekwani, R.S Kanchan, K.Gopakumar
**IEE proceedings on EPA ,vol152,No.6,November 2005,pp1539-1555** - Synchronised carrier based SVPWM signal generation scheme for the entire modulation range extending upto six-step mode using the sampled amplitudes of reference phase voltages; R.S. Kanchan, K. Gopakumar, Ralph Kennel, Accepted –
**IET – Electric Power Applications ,2007,I,(3),pp.407-415**. - A dual Five-level Inverter Topology for Induction Motor Drive with DC-link Capacitor Voltage Balancing and Common-mode Voltage Elimination In The Complete Modulation Range, P.N Tekwani, R.S Kanchan,K.Gopakumar, ,
**IEEE****�****IEEE Trans. on Industrial Electronics Part-I,Vol.54,no.5, OCT 2007.pp.2600-2608.** - A dual Five-level Inverter Topology for Induction Motor Drive with DC-link Capacitor Voltage Balancing and Common-Mode Voltage Elimination In The Complete Modulation Range� Part-II, P. N. Tekwani, R. S. Kanchan, and K. Gopakumar,
**IEEE Trans. on Industrial Electronics. Vol 54 No.5, OCT. 2007.pp2609-2617**, - Novel Current Error Space Phasor Based Hysteresis Controller Using Parabolic Bands for Control of Switching Frequency Variations; P.N. Tekwani, R.S. Kanchan, K. Gopakumar,
**IEEE Trans. on IE, Vol 54 No.5, OCt. 2007.pp2648-2656.** - A novel six phase induction motor drive without harmonic filters and with linear voltage control for the full modulation range – K.K Mohapatra, K.Gopakumar,
**EPE (European power electronics and drives) Journal,vol.16,no.4, December-2006** - Three level inverter scheme with common mode voltage elimination and DC link capacitor voltage balancing for an open-end winding induction motor drive, R.S Kanchan, P.N Tekwani, K.Gopakumar,
**IEEE Trans. On Power Electronics,vol.21,No.6, November 2006** - A sensorless field oriented control if induction motor using ripple currents in space phasor based PWM control- K.K Mohapatra, K.Gopakumar,
**EPE Journal,vol.16,no.3,September-2006**. - A multi-level inverter with 12-sided polygonal voltage space vector locations for an induction motor drive, Sanjay Lakshminarayanan, R. S. Kanchan, P. N. Tekwani, and K. Gopakumar,
**IEE Proceedings – Electric Power Applications,vol.153,no.3, May-2006**,K. - Five-Level Inverter Topology for IM Drive With DC-Link Capacitor Voltage Balancing and Common-Mode Voltage Elimination in Entire Modulation Range: A Closed-Loop Control Accepted for the
**Polish Journal Electrical Review – Przeglad Elektrotechniczny**R .82 NR 2/2006.pp 73-83. - Independent field oriented control of two split-phase induction motors from a single six-phase inverter, K.K Mohapatra, R.S Kanchan, M.R Baiju, P.N Tekwani, K.Gopakumar,
**IEEE Transactions on Industrial electronics,Vol.52, no.5,October-2005** - Current Error Space Vector Based Hysteresis PWM Controller for Three-level Voltage Inverter fed Drive- accepted — P.N Tekwani, R.S Kanchan, K.Gopakumar accepted for publication in
**IEE-EPA Journal**– Vol.152. No.5. Sept.2005 - A Multi level inverter system for an induction motor with open-end windings. V.T Somasekhar, M.R Baiju, K.Gopakumar, K.K Mohapatra,
**IEEE Transactions on Industrial electronics**,52, NO.3, June-2005, pp 824-836. - Three level inverter configuration with common mode elimination for an induction motor drive, R.S Kanchan,P.N Tekwani,M.R Baiju,K.Gopakumar, A.Pittet,
**IEE Proceedings on Electric power applications**,152, No 2.April 2005, pp. 261-270 - Space vector PWM signal generation for multi-level inverters using only the sampled amplitudes of reference phase voltages, R.S Kanchan, M.R Baiju, K.K Mohapatra, P.P Ouseph, K.Gopakumar,
**IEE Proceedings on Electric power applications**,152, No.2, April 2005, pp.297-309 - A space phasor based current hysteresis controller using adjacent inverter voltage vector selection with smooth transition to six-step operation for a three phase voltage source inverter, M.R Baiju, K.K Mohapatra, R.S Kanchan, P.N Tekwani, K.Gopakumar,
**EPE Journal**,15, No.1,2005. - A four level inverter scheme with reduced common mode voltage for an induction motor drive, R.S Kanchan, P.N Tekwani, M.R Baiju, K.Gopakumar,
**EPE (European power electronics and drives) journal**,15, No.3,2005. - Independent speed control of two six-phase induction motors using a single six-phase inverter, K.K Mohapatra, M.R Baiju, K.Gopakumar,
**EPE Journal**,13,No.3, August 2004, pp.49-62. - A dual two-level inverter scheme with commonmode voltage elimination for an induction motor drive : M.R.Baiju, K.K Mohapatra, R.S Kanchan, K.Gopakumar,
**IEEE Trans. On Power Electronics.**19. No.3, May 2004, pp.794-805. - Dual two-level inverter scheme for an open-end winding IM drive with a single DC power supply and improved DC bus utilisation : V.T Somasekhar, K.Gopakumar, M.R Baiju.
**IEE Proceedings on Electric power applications. UK. March 2004** - A harmonic elimination and suppression scheme for an open-end winding induction motor drive, K.K Mohapatra,K.Gopakumar,V.T Somasekhar, L.Umanand
**IEEE Transactions on Industrial electronics****.**50,No.6, Dec.2003, pp.1187-1197 - A high resolution multi-level voltage space phasor generation for an open-end winding induction motor drive. M.R Baiju, K.Gopakumar, V.T Somasekhar, K.K Mohapatra, L.Umanand. CD Rom copy No.18.
**EPE Journal**, Vol.13, no.4. November 2003. - A harmonic elimination scheme for an induction motor with open-end windings fed from two inverters with asymmetrical DC link voltages: K.K Mohapatra, K.Gopakumar, V.T Somasekhar,
**EPE journal****.**12., no.4., November-2003. - A five level inverter voltage space phasor generation for an open-end winding induction motor drive. M.R Baiju, K.K Mohapatra, V.T Somasekhar, K.Gopakumar, L.Umanand,
**IEE Proc.-Electr. Power Applications**, Vol.150, No.5, September 2003, pp531-538 - A space vector based PWM method using only instantaneous amplitudes of reference phase voltages for three level inverters. M.R Baiju, K.Gopakumar, V.T Somasekhar,
**EPE journal****.**13.no.2.May-2003. pp 35-45. - Three-level inverter configuration cascading two two-level inverters. V.T Somasekhar, K.Gopakumar,
**IEE Proceedings****.**Power. Appl., Vol.150,No.3, May 2003. pp 245-254. - A multilevel voltage space phasor generation for an open-end winding induction motor drive using a dual�inverter scheme with asymmetrical DC link voltages: V.T Somasekhar, K.Gopakumar, E.G Shivakumar, A.Pittet,
**EPE journal****.**12, no.3, August-2002, pp 7-15 - A space vector modulation scheme for a dual two level inverter fed open-end winding induction motor drive for the elimination of zero sequence currents, V.T Somasekhar, K.Gopakumar, E.G Shivakumar, S.KSinha
**EPE journal****..**12.no.2.May 2002, pp.26-36. - PWM inverter switching stratqgy for a dud two-levelinverter fed open-end winding induction motor drive with a switched neutral,V.T Somasekhar, K.Gopakumar,A.Pittet and V.T Ranganathan
**IEE Proc. -Electric Power****Vol.149.no.2,March2002,pp.153-160 journal.**Vol.12.no.2.May 2002, pp.26-36. - Space vector PWM control of Dual inverter fed open-end winding induction motor drive. E.G Shivakumar, K.Gopakumar, S.K.Sinha, A.Pittet, V.T Ranganathan,
**EPE journal****.**12. no.1. February 2002, pp.9-18. - A PWM scheme for a 3-level inverter cascading two 2-level inverters, V.T Somasekhar K.Gopakumar, M.R Baiju, K.K Mohapatra, L.Umanand
**Journal of the Indian Institute of Science**, Bangalore, vol.82,No.1, Jan-Feb.2002, pp 23-36. - A multi Axis space Phasor Based Current Hysteresis Controller for PWM Inverters : V.Mistry, Sailesh waikar, K.Gopakumar, V.T Ranganathan, L.Umanand
**EPE journal****.**10. no.1. April-2000, pp.17-25. - A sensorless vector control scheme for induction motors using space phasor based current hysteresis controller. Ebenezer.V, K.Gopakumar, V.T Ranganathan,
**EPE journal****.**9.no.3-4. January 2000, pp.42-46. - Vector Control of Induction Motor with Split Phase Stator Windings. K. Gopakumar, V.T Ranganathan, S.R Bhat.
**EPE (European Power Electronics and Drives)**Vol.7. no.1-2 August-October-1997, pp.61-66 - Split�phase induction motor operation from PWM voltage source inverter. K.Gopakumar, V.T Ranganathan, S.R Bhat,
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