Professor K. Gopakumar
Professor
Department of Electronic Systems Engineering ( Formerly CEDT)
Indian Institute of Science (IISc)
Bangalore 560012
Email : kgopa@cedt.iisc.ernet.in
Phone : +91 80 23600810 Ext 234 (off.)
Mobile : +919448227853
Fax : 08022932290, 08023600808
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 SplitPhase 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 (CEDT), 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 EditorinChief 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 LecturerIEEE Industrial Electronics Society
 IISc Alumni award for Excellence in Research in Engineering2016
 ABB Chair professor 2016 2018
Professional Experience – 27 years
19841987: 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 SROSS1 (Stretched Rohini Satellite Series1) 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: Professo
Major M.Tech. Projects
 Multiple outputs switched mode power pack – A compact generalpurpose power supply with feedback control is designed and developed, using power MOSFETS. Output power is 50 watts and the converter switching frequency is 50kHz.
 PWM current source inverter drive – A fourquadrant converter is designed for a 5HP induction motor drive. This involved the design and development of frontend phase controlled converter, current source inverter using thyristors and the necessary PWM closed loop control circuits.
 A PWM drive for a high speed PCB drilling machine – A compact 1kHz output frequency PWM inverter is designed and developed, using power MOSFETs, for a 150 watts, 50,000rpm PCB drilling motor.
 AC servo drive – power circuit – A frontend controlled converter for inverter drive applications is designed and developed.
 110 volt, PWM inverter for railways – A 2kw MOSFET based PWM inverter is designed and developed with necessary control circuit and the output filters for the sine wave operation. The input to the inverter is battery and a controlled voltage booster stage is also developed.
 A field oriented controlled inverter drive for induction motor using DSP AD 2105 – A digital control card for a vectorcontrolled drive is developed. Inputs to the card are the speed reference signal, speed feed back signal, motor voltage and current signals. Appropriate speed and current control loops and the vector rotator algorithms are implemented and the controller card will output the required inverter PWM signals.
 A general purpose V/f drive using flux computation from terminal measurements – The general purpose PWM card is developed using 80 C 196 microcontroller. Space phasor based PWM for variable speed operation is implemented with appropriate protection circuits.
 A space phasor based PWM inverter drive using single chip micro controller – This is a continuation of the abovementioned project for extending the motor operation in the over modulation region, without any transients.
 A multi Axis space Phasor Based PWM Current Hysteresis Controller for V/f drive The aim is to develop a simple space phasor based current hysteresis controller for V/f drive using DSP chip, for an IGBT based inverter.
 A sensorless vector control scheme for induction motors using a space phasor based current hysteresis controller
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 Technology2004
 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, USAJune2005
 A fivelevel inverter scheme with common mode voltage suppression and DC link capacitor balancing for induction motor drives for high power applications by cascading twolevel an dthreelevel inverter structures :Department of Science and Technology200620Lakhs
 A multilevel 12sided polygonal voltage space vector structure for high power induction motor drive applications by cascading the conventional twolevel and threelevel inverters. : – Department of Science and Technology2008.30lakhs
 Design and development of a threelevel 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.26632670, April.2017.
 Extending the Linear Modulation Range to the Full Base Speed Using a Single DC Link Multilevel Inverter with Capacitor Fed HBridges 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.54505458,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.10091017, 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.54505458,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.20642071, 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.5259,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.6068, 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.52855292, Aug.2016.
 A 3Level Dodecagonal Space Vector based Harmonic Suppression Scheme for OpenEnd 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.72267233, Nov.2016.
 Multilevel Dodecagonal Voltage Space Vector Structure Generation for Openend 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.27572765 , May2016.
 Timing calculations for a general Nlevel dodecagonal space vector structure using only reference phase voltages; R. Sudharshan Kaarthik, K. Gopakumar, Carlo Cecati and Istvan Nagy.. IEEE Transactions on Industrial Electronics,Vol63, no.3,pp.13951403,March 2016.
 Reduced commonmode voltage operation of a new sevenlevel 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.519528,3.9 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, Volume62, no.11,pp.67486755, Nov. 2015.
 Low Order Harmonic Suppression for Openend Winding IM with Dodecagonal Space Vector using a Single DClink Supply. Pramanick, S. ; Abdul Azeez, N. ; Kaarthik, S. ; Gopakumar, K. ; Cecati, C.. IEEE Transactions on Industrial Electronics, Volume 62,no.9,pp 53405347, 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, Volume62, Page7987, Issue: 1,2015
 A SeventeenLevel Inverter formed by Cascading Flying Capacitor and Floating Capacitor Hbridges. Roshan Kumar, P. ; Sudharshan Kaarthik ; Gopakumar, K. ; Leon, J.I. ; Franquelo, L.G.. IEEE Transactions on Power Electronics, Volume: 30, Page(s): 34713478, Issue: 7,2015
 A Harmonic Suppression Scheme for OpenEnd Winding SplitPhase IM Drive Using Capacitive Filters, For The Full Speed Range; Najath Abdul Azeez,K Gopakumar,and Carlo Cecati IEEE Transactions on IE, Vol61,issue 10,pp 52135221, 2014
 Hysteresis current controller for a general nlevel 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. 16401649,Sept.2013
 A Threelevel Commonmode Voltage Eliminated Inverter With Single DCSupply Using Flying Capacitor Inverter and Cascaded HBridge ; Roshan Kumar, K.Mathew, K Gopakumar, Jose leon and Leopoldo Franquelo IEEE Trans On PELs,Vol.29,No.3,pp14021409,March 2014
 A Medium Voltage Inverter Fed IM Drive using Multilevel 12sided 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 17001709,April2014
 A nearly constant switching frequency Current Error Space Vector Based Hysteresis Controller for an IM drive with 12sided polygonal voltage space vectors , Najath Abdul Azeez,Anubrata Dey, K.Mathew,Jaison mathew,and K Gopakumar EPE Journal, Volume: 234, 2013
 A Reduced DeviceCount Hybrid Multilevel Inverter Topology with single DC Source andImproved Fault Tolerance “,,Rajeevan P.P,and K Gopakumar EPE Journal,Vol.23,no.2,pp1423,June2013
 Nearly Constant Switching Frequency Hysteresis Current controller with fast online computation Of Boundary for a 2level 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.13241332
 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.37233732.
 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.35703583
 A Hybrid Fivelevel 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.20372047.
 A NineLevel Inverter Topology for Medium Voltage Induction Motor Drive with Openend Stator Winding”,Rajeevan P.P,sivakumar,K.Gopakumar,Chintan Patel, Aburub haitham IEEE Transactions on Industrial Electronics,vol.60,no.9,pp.362736362013
 A Space Vector based Hysteresis Current Controller for a General nlevel 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.19891998
 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.516523.
 A five level inverter topology with single DCpower suply by cascading aflying capacitor inverter and an Hbridge, 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.35053513
 Fast Direct Torque Control of Openend Induction Motor Drive using 12sided 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.400410
 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.124133.
 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 AbuRub Haitham IEEE Trans on PELs,Vol.23,NO.3,2012,pp.15211529.
 An asymmetric cascaded HBridge inverters for generating 12sided 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 Sevenlevel Inverter topology for IM Drive using Twolevel Inverters and Floating Capacitor Fed HBridges,Rajeevan P.P,K.Sivakumar,Chintan Patel,Rijil Ramchand, Gopakumar.K IEEE Trans.on Power electronics,Vol.26,Issue.6,2012,pp.17331740.
 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.384392,2011
 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,Aug2010,pp25532580
 A hybrid multilevel inverter topology for an openend winding IM drive using twolevel inverters in series with a capaciotr fed Hbridge cell ,K.Sivakumar,Anandarup Das, Rjil Ramchand,Chintan Patel,and K.Gopakumar IEEE Trans. On Industrial Electronics,Vol.57,no.11,Nov.2010,pp.37073815
 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,pp512
 A survey on cascaded multilevel inverters ,Mariusz Malinowski,K.Gopakumar,Jose Rodriguez and Marcelo Perez, IEEE Trans. On Industrial ElectronicsVol.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.27762784,2010.
 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.219231,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,pp6376472010
 A Pulse Width Modulated control of Induction Motor drive using multilevel 12sided 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 DClink Capacitor Voltage Balancing with CMV Elimination using only the Switching State Redundancies fora Reduced Switch Count MultiLevel Inverter fed IM Drive, Gopal Mondal, Rijil Ramchand,F.sheron,and K.Gopakumar EPE( European power electronics journal),Vol.19,N0.1, March2009
 A dual seven level inverter supply for an openend winding induction motor drive, Gopal Mondal,K. Gopakumar,Rijil Ramchand,Emil Levi IEEE Trans.on IE.Vol.56,no.5,May2009,pp.16651673.
 A combination of Hexagonal and 12sided 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 threelevel 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. 8492, U.K.
 An 18sided 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. 5663, U.K
 Twelvesided 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 27612768..
 A reduced switch count fivelevel inverter with commonmode voltage elimination for an openend winding induction motor drive; Gopal Mondal, K. Gopakumar, P.N. Tekwani, E. Levi, – IEEE Trans. on IE vol.54,no.4,August 2007.pp 23442351.
 Linearization of the multilevel SVPWM signal generation in the overmodulation region extending up to sixstep mode using only the sampled amplitudes of reference phase voltages; R.S Kanchan, P.N Tekwani and K.Gopakumar EPE JournalVol.17,no.2,June2007 .
 A fivelevel inverter topology with commonmode 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 1123, Brussels, Belgium.
 Fivelevel inverter scheme for an induction motor drive with simultaneous elimination of commonmode voltage and dclink capacitor voltage unbalance P.N Tekwani, R.S Kanchan, K.Gopakumar IEE proceedings on EPA ,vol152,No.6,November 2005,pp15391555
 Synchronised carrier based SVPWM signal generation scheme for the entire modulation range extending upto sixstep 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.407415.
 A dual Fivelevel Inverter Topology for Induction Motor Drive with DClink Capacitor Voltage Balancing and Commonmode Voltage Elimination In The Complete Modulation Range, P.N Tekwani, R.S Kanchan,K.Gopakumar, , IEEE �IEEE Trans. on Industrial Electronics PartI,Vol.54,no.5, OCT 2007.pp.26002608.
 A dual Fivelevel Inverter Topology for Induction Motor Drive with DClink Capacitor Voltage Balancing and CommonMode Voltage Elimination In The Complete Modulation Range� PartII, P. N. Tekwani, R. S. Kanchan, and K. Gopakumar, IEEE Trans. on Industrial Electronics. Vol 54 No.5, OCT. 2007.pp26092617,
 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.pp26482656.
 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, December2006
 Three level inverter scheme with common mode voltage elimination and DC link capacitor voltage balancing for an openend 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,September2006.
 A multilevel inverter with 12sided 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, May2006, U.K.
 FiveLevel Inverter Topology for IM Drive With DCLink Capacitor Voltage Balancing and CommonMode Voltage Elimination in Entire Modulation Range: A ClosedLoop Control Accepted for the Polish Journal Electrical Review – Przeglad Elektrotechniczny R .82 NR 2/2006.pp 7383.
 Independent field oriented control of two splitphase induction motors from a single sixphase inverter, K.K Mohapatra, R.S Kanchan, M.R Baiju, P.N Tekwani, K.Gopakumar, IEEE Transactions on Industrial electronics,Vol.52, no.5,October2005
 Current Error Space Vector Based Hysteresis PWM Controller for Threelevel Voltage Inverter fed Drive accepted — P.N Tekwani, R.S Kanchan, K.Gopakumar accepted for publication in IEEEPA Journal – Vol.152. No.5. Sept.2005
 A Multi level inverter system for an induction motor with openend windings. V.T Somasekhar, M.R Baiju, K.Gopakumar, K.K Mohapatra, IEEE Transactions on Industrial electronics, Vol.52, NO.3, June2005, pp 824836.
 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, Vol.152, No 2.April 2005, pp. 261270
 Space vector PWM signal generation for multilevel 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, Vol.152, No.2, April 2005, pp.297309
 A space phasor based current hysteresis controller using adjacent inverter voltage vector selection with smooth transition to sixstep operation for a three phase voltage source inverter, M.R Baiju, K.K Mohapatra, R.S Kanchan, P.N Tekwani, K.Gopakumar, EPE Journal, Vol.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, Vol.15, No.3,2005.
 Independent speed control of two sixphase induction motors using a single sixphase inverter, K.K Mohapatra, M.R Baiju, K.Gopakumar, EPE Journal, Vol.13,No.3, August 2004, pp.4962.
 A dual twolevel 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. Vol.19. No.3, May 2004, pp.794805.
 Dual twolevel inverter scheme for an openend 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 openend winding induction motor drive, K.K Mohapatra,K.Gopakumar,V.T Somasekhar, L.Umanand IEEE Transactions on Industrial electronics. Vol.50,No.6, Dec.2003, pp.11871197
 A high resolution multilevel voltage space phasor generation for an openend 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 openend windings fed from two inverters with asymmetrical DC link voltages: K.K Mohapatra, K.Gopakumar, V.T Somasekhar, EPE journal. Vol.12., no.4., November2003.
 A five level inverter voltage space phasor generation for an openend 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, pp531538
 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. Vol.13.no.2.May2003. pp 3545.
 Threelevel inverter configuration cascading two twolevel inverters. V.T Somasekhar, K.Gopakumar, IEE Proceedings. Electr. Power. Appl., Vol.150,No.3, May 2003. pp 245254.
 A multilevel voltage space phasor generation for an openend 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. Vol.12, no.3, August2002, pp 715
 A space vector modulation scheme for a dual two level inverter fed openend winding induction motor drive for the elimination of zero sequence currents, V.T Somasekhar, K.Gopakumar, E.G Shivakumar, S.KSinha EPE journal.. Vol.12.no.2.May 2002, pp.2636.
 PWM inverter switching stratqgy for a dud twolevelinverter fed openend winding induction motor drive with a switched neutral,V.T Somasekhar, K.Gopakumar,A.Pittet and V.T Ranganathan IEE Proc. Electric Power Appln.Vol.149.no.2,March2002,pp.153160 journal. Vol.12.no.2.May 2002, pp.2636.
 Space vector PWM control of Dual inverter fed openend winding induction motor drive. E.G Shivakumar, K.Gopakumar, S.K.Sinha, A.Pittet, V.T Ranganathan, EPE journal. Vol.12. no.1. February 2002, pp.918.
 A PWM scheme for a 3level inverter cascading two 2level 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, JanFeb.2002, pp 2336.
 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. Vol.10. no.1. April2000, pp.1725.
 A sensorless vector control scheme for induction motors using space phasor based current hysteresis controller. Ebenezer.V, K.Gopakumar, V.T Ranganathan, EPE journal. Vol.9.no.34. January 2000, pp.4246.
 Vector Control of Induction Motor with Split Phase Stator Windings. K. Gopakumar, V.T Ranganathan, S.R Bhat. EPE (European Power Electronics and Drives) journal. Vol.7. no.12 AugustOctober1997, pp.6166
 Split�phase induction motor operation from PWM voltage source inverter. K.Gopakumar, V.T Ranganathan, S.R Bhat, IEEE Trans. Industry Applns. Vol.29. No. 5. September/October 1993. pp 927933
 Performance of Improved Dual Current Source Inverter for Induction Motor Drive. K.Gopakumar, et. al. IETE, India, Vol.67, April – 1987.
 Modified Current Source Inverter fed Induction Motor Drive with Reduced Torque Pulsations. K. Gopakumar, et .al. IEE Proceedings, vol.131. pt. B. No. 4 July1984
Publications in Conferences

An Induction Motor Drive Scheme Generating TwentyFour Sided Voltage Space Vector Structure with Linear Modulation Range Near to Base Speed Krishna Raj R, K. Gopakumar, Mathews Boby, Mariusz Malinowski, Marek Jasinski, European Power Electronics (ECCE), EPE 2017. Warsaw, Poland.
 Multilevel dodecagonal space vector generation using stacked inverter cells for IM drives, Apurv Kumar Yadav; Mathews Boby; Sumit Pramanick; K. Gopakumar; Leopoldo G. Franquelo . IEEE 26th International Symposium on Industrial Electronics (ISIE), 2017.Edinburgh, UK
 Stacked Multilevel Inverter fed Six Phase Induction Motor with Reduced DC Link and Lower Voltage Devices; Viju Nair, Arun rahul,Gopakumar.K , sheldon williamson and Leopoldo Franquelo*, IEEEICIT 2017, Toronto, Canada.
 Elimination of dead time transients ina threelevel flying capacitor inverter using a state machine for switching state sequence selection;Abhijit.K,R. Sudharshan kaarthik, Mathews Boby,Gopakumar.K , and L.Umanand*, IEEEPEDES 2016, Trivandrum, India.
 A multilevel nine concentric Octa decagonal space vector structure for induction mtor drives using a single DC source; Mathews Boby,Sumit Pramanick, Arun Rahul.S, Gopakumar.K , and L.Umanand*, IEEEPEDES 2016, Trivandrum, India.
 An improvised algorithm for capacitor voltage balancing of symmetrically cascaded floating capacitor Hbridge inverter;Roshan KumarR, Gopakumar.K*, IEEEIECON 2016, Florence, Italy.
 A novel forty nine level stacked inverter topology using low voltage devices for drives; Viju Nair; Sumit Pramanick; Arun Rahul S; K. Gopakumar and B. Basak and Leopoldo,*, IEEEIECON 2016, Florence, Italy.
 A Multilevel Inverter Fed IM Drive with Dodecagonal Voltage Space Vector Structure using a Single DC Source with Linear Modulation Range Near to Base Speed; Mathews Boby; Sumit Pramanick; Arun Rahul S; K. Gopakumar and L. Umanand R,*, IEEEEPE 2016, Carlshruhe, Germany.
 Reduced switch count seventeen level inverter topology for openend induction motord rives; Abhijit Kshirsagar,sudharshan Kaarthik,Arun Rahul S; K. Gopakumar and L. Umanand R,Sujit Biswas, Carlo cecati*, IEEEIECON 2016,Florence,Italy.
 A new nine level stacked inverter topology for a symmetric six phase induction motor drive with low voltage devices and usinga single DC link, Viju Nair R, Arun Rahul S, Sumit Pramanick, K.Gopakumar and Leopoldo G. Franquelo,*, IEEEISIE 2016, California, USA.
 Timing Calculations for Three Level Dodecagonal Space Vector Structure From Reference Phase Voltages R. Sudharshan Kaarthik, Prof. K. Gopakumar,Carlo Cecati, Istvan Nagy ,*, IEEEIECON 2015, Yokohama, Japan.
 Nine Level Inverter for Open End Induction Motor with Eight Switches per Phase Abhijit Kshirsagar, R. Sudharshan Kaarthik, Prof. K. Gopakumar,Prof. L. Umanand, and Prof. Kaushik Rajashekhara,*, IEEEIECON 2015, Yokohama, Japan.
 A Hybrid seven level Inverter topologywith a single DC supply and reduced switch count,Arun Rahul S, Sudharshan Kaarthik, K Gopakumar, Rajeevan P.P, Jose I Leon and Leopoldo Franquelo,Istvan Nagy,*, EPEECCE 2015, Geneva, Switzerland.
 A Hybrid Multilevel Inverter scheme for Induction Motor Drives and GridTied Applications using a Single DClink, Sudharshan Kaarthik, Roshan Kumar, K Gopakumar, Jose I Leon and Leopoldo Franquelo,*, ICIT 2015, Seville, Spain.
 A 19 Level Dodecagonal Voltage Space Vector Structure for Medium Voltage IM Drive, Sudharshan kaarthik, Gopakumar K, Carlo Cecati and Istvan nagy,*, IECON 2014, Dallas, Texas, USA
 An openend winding IM drive with multilevel 12sided polygonal vectors with symmetric triangles, Sudharshan Kaarthik, Gopakumar .K, jaison mathew, T. Undeland,*, EPE ECCE 2014, Lappeenranta, Finaland
 A 5th and 7th order harmonic suppression scheme using capacitive filtering for 2level VSI fed IM drive Najath Abdul Azeez , Sumit Pramanick, K. Gopakumar and Carlo Cecati,*, International Symposium on Power Electronics, Electrical Drives, Automation and Motion Conference 2014,Naples, Italy
 A Seventeenlevel Inverter With a Single DClink For Motor Drives,Roshan Kumar, Sudharshan Karthik,Rajeevan P.P, K Gopakumar,Jose Leon and Leopoldo Franquelo,*, IEEE IECON2013,WIEN, Austria,
 A 5th and 7th order harmonic suppression scheme for openend winding asymmetrical sixphase IM drive using a capacitor inverter,Najath Abdul Azeez, Jaison Mathew, K Gopakumar, and Carlo Decati,*, IEEE IECON2013,WIEN, Austria,
 A multilevel inverter topology for the generation of Dodecagonal space vectors for medium voltage induction motor with a modified SVPWM strategy for reduction of THD , Jaison Mathew, K.Mathew,Najath,Rajeevan.P.P and K Gopakumar,*, EPE2013,Lille,France,
 Simple Computation Techniques of Online Boundary to Achieve Constant Switching Frequency in any General nlevel VSI fed IM Drive using Hysteresis Current Controller, Anubrata Dey,Najath, K Gopakumar, Marian Kazmierkowski*, IEEEICIT2013,Cape Town,Sourh Africa
 Multilevel Octadecagonal Space Vector Generation for Induction Motor Drives by Cascading Asymmetric Three Level Inverters,K Mathew, Jaison Mathew, Najath Abdul Azeez, Anubrata Dey, L Umanand, K Gopakumar*, IEEEIECON2012,Montreal,Canada
 A Nearly Constant Switching Frequency Current Hysteresis Controller with Generalized Parabolic Boundaries using 12sided Polygonal Voltage,Najath,Anubrata Dey,K.Mathew,Jaison Mathew and K.Gopakumar, IEEEICEM2012,France
 Multilevel Octadecagonal Space Vector Generation for Induction Motor Drives by Cascading Asymmetric Three Level Inverters,K.Mathew, Jaison Mathew,Najath, Anubrata, Gopakumar and L.Umanand IEEEIECON2012,Raleigh,USA
 Direct torque control acheme of IM drive with 12sided polygonal volatge space vectors,Chintan Patel, Rijil Ramchand,Rajeevan P.P,K.Sivakumar,Anandarup das,.K,Gopakumar.K, and Marian Kazmierkowski, EPE2011,Birmingham
 Online Computation of Current Error Boundary of a Hysteresis Controller for a General nlevel VSI Fed Drive with Nearly Constant Switching Frequency,Anubrata Dev,Rajeevan P.P, Mathew.K,Gopakumar.K National Power electronics ConferenceNPEC2011,Kolkata.
 Simple online computation of nearly constant switching frequency hysteresis controller boundary for a 2level VSI fed drive Anubrata Dev,Rajeevan P.P,Rijil Ramchand, Gopakumar K,AbuRub Haitham PEIA2011 ( Power Electronics for Industrial Application and Renewable Energy Conversion) Seminar, Qatar2011.
 Nearly Constant Switching Frequency Hysteresis Current Controller for General nlevel Inverter Fed Induction Motor Drive Anubrata Dev,Rajeevan P.P, Chintan Patel,Mathew.K, Gopakumar K, IECOn2012,Melbourne,Australia.
 A Hybrid sevenlevel Inverter for IM Drive, Rajeevan P.P,Gopakumar K, Sivakumar K, Chintan Patel,Rijil, Gopakumar IEEEPEDES2010,New Delhi.
 A Hybrid Ninelevel Inverter for IM Drive Rajeevan P.P,Gopakumar K, Sivakumar K, Chintan Patel, Gopakumar K, AbuRub Haitham, ISIE2011,Gdansk,Poland.
 A Current Error Space Vector Based Hysteresis Controller with Constant Switching Frequency and Simple Online boundary Computation for VSI fed IM Drive , Rijil Ramchand, Chintan Patel, Anandarup Das, Sivakumar K,Gopakumar K, IECON2010,Phoenix,USA.
 Dodecagonal space vector diagram using cascaded Hbrideg inverters,Anandarup das,K.Mathew,Chintan Patel,Rijil Ramchand,and K.Gopakumar, ISIE2010,Bari,Italy.
 A There level voltage space vector generation for openend winding induction motor using single volatge source driven dual twolevel inverter, K. Sivakumar,Anandarup Das,Rijil Ramchand, Chintan Patel, K.Gopakumar, TENCON 2009, conf.Singapore.
 A simple five level inverter topology for induction motor drive using conventional two level inverters and flying capacitor technique,K. Sivakumar, Anandarup Das,Rijil Ramchand, Chintan Patel, K.Gopakumar, IECON 2009, conf.Porto, Portugal.
 Multilevel dodecagonal space vector generation for open end winding induction motor drive using conventional three level inverters,Anandarup Das, K. Sivakumar,Rijil Ramchand, Chintan Patel, K.Gopakumar, EPE 2009, conf.Barcelona, Spain.
 A High Resolution pulse wisdth modulation technique using concentric multilevel Dodecagonal voltage space vector structures,Anandarup Das, K. Sivakumar,Rijil Ramchand, Chintan Patel, K.Gopakumar, IEEE,ISIE2009, conf. in Seoul, South Korea.
 A Hysteresis PWM Controller with constant switching frequency for two level VSI fed drives with operation extending to the six step mode,Rijil Ramchand, Anandarup Das, K.Sivakumar,Chintan Patel, K.Gopakumar, PCIMEurope2009, conf in Nurenberg, Germany ,May.11 to May.13.
 A Front end switched rectifier DC source for neutral point balancing of a NPC three level inverter for the full modulation range,K. Sivakumar,Sukumar De, K.Gopakumar, Gopal Mondal, Keith Corzine, IEEE,ISIE2008, conf in Cambridge ,June30 to July2.
 A multilevel inverter with hexagonal and 12sided polygonal space vector structure for induction motor drive, Anandarup Das,K. Sivakumar,Gopal Mondal, K.Gopakumar, Accepted IEEE,IECON2008, conf in Orlando,USA .
 An improved sapce phasor based current hysteresis controller with reduced switching frequency variations using variable parabolic bands,Rijil Ramchand, K.Gopakumar,P.N Tekwani, and M.R Baiju, National Power electronics conference,2007, INDIA.
 DC link capacitor balancing of NPC inverter using switched voltage source for the full modulation range ,K.Sivakumar,K.Gopakumar and V.T Somasekhar National Power electronics conference,2007, INDIA.
 Threelevel inverter fed openend winding IM drive with common mode volatge elimination and reduced power devise count,Sheron Figarado, K.Gopakumar, Gopal Mondal, K.Sivakumar, N.S Dinesh The 33rd annual conference of the IEEE Industrial electronics society( IECON), Nov.58, 2007,Taipei, Taiwan,pp12381243.
 Multilevel inverter with 18sided polygonal voltage space vector for an openend winding induction motor drive – Sanjay Lakshminarayanan,Gopal Mondal and K.Gopakumar IEEE, EUROCON2007,conference,Warsaw,Poland
 A Multilevel inverter structure with cascaded two level and three level inverters for IM drive with CMV elimination and DC link capacitor voltage balancing – Gopal Mondal,K.Gopakumar,P.N Tekwani,and Emil Levi IEEE, IAS2007 conference,New Orleans,USA
 A five level inverter scheme with common mode volatge elimination by cascading conventional two level and three level NPC inverters for an induction motor drive – Gopal Mondal, K.Gopakumar,P.N. Tekwani and E.Levi EPE2007 conference,Aalborg.
 Elimination of common monde voltage and fifth and seventh harmonics in a multilevel inverter fed IM drive using 12sided polygonal voltage space phasor – Sanjay Lakshminarayanan, Gopal Mondal P.N. Tekwani and K.Gopakumar IEEE PEDES, 2006 conference, Delhi.
 Generation of Parabolic Trajectories for Current Error Space Phasor similar to an SVPWM Controller for Control of Switching Frequency Variation in Current Hysteresis PWM Controlled IM Drives P.N Tekwani R.S Kanchan, and K.Gopakumar IEEE, ICIT2006 conference, MUMBAI
 Switching frequency variation control in hysteresis PWM controller for IM drives using variable parabolic bands for current error space phasor, P.N Tekwani, R.S Kanchan, Sanjay Lakshminarayanan, Gopakumar – IEEEISIE conference, Montreal, 2006.
 Linearization of the multilevel SVPWM in the overmodulation region National Power electronics conference, Dec22 to 24, 2005, INDIA
 A Multilevel Inverter Scheme With Inherent Commonmode Voltage Elimination and DClink Capacitor Voltage Balancing for Openend Winding Induction Motor Drive – National Power electronics conference, Dec22 to 24, 2005, INDIA.
 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, accepted of presenting in IEEEPELINCEC2005 (Power electronics and intelligent control for energy conservationWarsaw Poland)
 A space vector based PWM switching scheme for the reduction of common mode voltages for a dual inverter fed openend winding induction motor drive, S.Srinivas, V.T Somasekhar, K.Gopakumar, IEEE, PESC2005 conference, Brazil.
 A self adaptive space phasor based hysteresis current controller with switching of adjacent inverter voltage vectors for three level voltage source inverter fed induction motor drives, P.N Tekwani, R.S Kanchan, K.Gopakumar, accepted for presenting in the IEEE, IEMDC conference, USA, San Antonio2005
 Three level inverter scheme with common mode voltage elimination and DC link capacitor voltage balancing for an openend winding induction motor drive, R.S Kanchan, P.N Tekwani, K.Gopakumar, accepted for presenting in the IEEE IEMDC conference, USA, San Antonio2005
 A five level inverter topology with common mode voltage elimination for induction motor drives, P.N Tekwani, R.S Kanchan, K.Gopakumar, EPE conference, Sept.1114 Dresden2005
 A seven level voltage space phasor generation scheme for an openend winding induction motor drive with asymmetric DC link voltages, R.S Kanchan, P.N Tekwani, M.R Baiju, K.Gopakumar, IPEC, 2005, Niggata, Japan
 A sensorless speed control using stator ripple currents for an induction motor drive with space phasor PWM. K.K Mohapatra, M.R baiju, K.Gopakumar, Balram Murty, IEE PEMD2004 conference Edinburgh., UK. pp 8186
 A New five level inverter system for an induction motor with openend windings. V.T Somasekhar, K.Chandrasekhar, K.Gopakumar. IEEE . PEDS2003, Singapore.
 Space vector PWM technique using only the instantaneous reference phase voltages for a three level inverter cascading two 2level inverters. M.R Baiju, K.K Mohapatra, R.S Kanchan, K.Gopakumar. NPEC2003, IIT Mumbai
 A five level inverter voltage space vector generation for an openend winding induction motor drive. M.R Baiju, K.K Mohapatra, K.K Mohapatra, L.Umanand,K.Gopakumar. IEEE,APEC2003,USA
 Space vector based PWM method for dual inverter fed openend winding induction motor drive using only the instantaneous amplitudes of reference phase voltages. M.R Baiju, K.K Mohapatara, K.Gopakumar IEEE PEDS 2003 conference, Singapore.
 A novel modulation scheme for a six phase induction motor with openend windings, K.K Mohapatra, K. Gopakumar, V.T Somasekhar, IEEE IECON02 conference in Spain2002, Nov 4th to Nov 8th.
 A multilevel inverter system for an induction motor drive with openend winding;V.T Somasekhar, M.R baiju, K.K Mohapatra,K.Gopakumar, IEEEpEDS Conf. Singapore2002 conference.
 Multi axis space phasor based multi level current hysteresis controller for an openend winding induction motor fed from dual inverters; M.R baiju,K.Gopakumar, L.Umanand, Andre Pittet, PCIM2002 conference, Nurnberg, Germany, pp. 405411.
 A multi level space phasor based PWM strategy for an open end winding induction motor drive using two inverters with different DC link voltages.V.T Somasekhar, K. Gopakumar Andre Pittet, V.T Ranganathan, IEEE, PEDS conference, Indonesia2001, pp.169175.
 A novel PWM inverter switching strategy for a dual twolevel inverter fed openend winding nduction motor driv: E.G Shivakumar, K.Gopakumar,S.K Sinha, Andrei Pittet, V.T Ranganathan IEEE APEC conference, USA 2001, pp.169174
 Space vector PWM control of dual inverter fed openend winding Induction motor drive: E.G Shivakumar, V.T Somasekhar, K.K Mohapatra, K.Gopakumar IEEE PEDS conference, Indonesia 2001, pp.169174
 Modelling and simulation of sensorless vector control of hybrid step motor.Muthukumar, S.K. Sinha, K.Gopakumar, L.Umanand. Proceedings, TwentyNinth Annual Symposium, Incremental Motion Control Systems & Devices. Berkley, USA 2000, pp.171179
 Asymmetric multilevel converter for high resolution voltage phasor generation: A Rufer, M.Veenstra, EPFL, Switzerland and K.Gopakumar CEDT, India, EPE conf. Lausanne, switzerland2000.
 A study on the parallel operation of a front end converter for a high speed electric traction drive: Hongje Ryoo et.al KERI, changwon, Korea and K.Gopakumar, CEDT, India, KIEE Annual autumn Conference98,Korea.pp.121124
 Configurations of high power VSI drives for traction applications using multi level inverters and multi phase induction motors: K.Gopakumar, CEDT, India, GeunHie Rim, KERI, Changwon, Korea. KIEE (Korean Institution of Electrical and Electronic Engineers), Fall conferenceNov97 pp.500504
 A Multi axis space phasor based crrent hysteresis controller for Induction motor drive.Vinay M Mistry,S.P Waikar K.Gopakumar, L.Umanand V.T Ranganathan, IEEE PEDS Conference,Singapore 1997. .
 Vector control of induction motor with split phase stator winding. K.Gopakumar, V.T Ranganathan, S.R Bhat, IEEE IAS Conference 1994. .
 An efficient PWM technique for split phase induction motor operation using dual voltage source inverters. K.Gopakumar, V.T Ranganathan, S.R Bhat, IEEE IAS Conference 1993. pp582587.
 Three Phase Voltage Source Inverter for a high Speed PCB Drilling Machine. K. Gopakumar. et.al, PCIM – 90 on intelligent Motion. Munich. June 90
 Comparative Study of the Dynamic Performance of Two Control schemes for VSI fed induction motor Drive. K. Gopakumar, et.al. IEEE. conf. Computers, Systems and signal Processing, December 1984
 Torque Analysis of a SixPhase Induction Motor fed From a Current Source Inverter. Gopakumar, et.al. IEEE conf. Computers, Systems and Signal Processing, December 1984
Ph.D. Students Completed :
 E.G. Shivakumar : Ph.D. – Jan2002, Thesis title: Study on space vector PWM control of dual inverter fed induction motor with openend winding.
 V.T. Somasekhar : Ph.D. – August2002, Thesis title: Investigations on multi level inverter schemes for induction motor with openend windings.
 Krushna Keshaba Mohapatra : Ph.D. – Sept.2003, Thesis title: study on harmonic elimination and suppression techniques for variable speed operation of three phase and split phase openend winding induction motor.
 M.R Baiju : Ph.D. – May2004, Thesis title: Investigations on multilevel inverter topologies and modulation schemes for induction motor drives.
 R.S Kanchan : Ph.D. August2005, Thesis title: Investigations on PWM signal generation and common mode voltage elimination schemes for multi level inverter fed induction motor drives.
 P.N. Tekwani : Ph.D. July2006, Thesis title: Investigations on space phasor based hysteresis current controllers and commonmode voltage elimination scheme with dclink capacitor voltage balancing for multilevel inverter fed induction motor drives.
 L.Sanjay:PhD,June2007,Thesis title: Generation of 12sided and 18sided polygonal volatge space vector fed induction motor drives by cascading conventional twolevel inverters
 Gopal Mondal:PhD,July2008,Thesis title:Reduced switch count multilevel inverter structure with common mode voltage elimination and DClink capaciotr balancing for IM drives
 Sheron Figarado:PhD,May2009,Thesis title:Multilevel inverter topologies with reduced power circuit complexity for medium voltage high power induction motor drives by cascading conventional twolevel and threelevel inverters
 Anandarup Das:PhD,Feb.2010,Thesis title:Investigations on Dodecagonal space vector generation for induction motor drives.
 Sivakumar.K:PhD,April2010,Thesis title:Multilevel voltage space vector generation for induction motor drives using conventional twolevel inverters and Hbridge cells.
 Rijil Ramchand:PhD,July.2010,Thesis title:Investigations on Boundary selection for switching frequency variation control of current error space phasor based hysteresis controllers for inverter fed IM drives.
 Sukumar De:PhD,Jan.2011.Rectifier and Inverter system for driving axial flux BLDC motors in more electric aircraft applications.
 Patel Chintanbhai Ramubhai:PhD,March.2011.Investigations on Sensorless Vector Control using Current Error Space Phasor and Direct Torque Control of Induction Motor Drive Based on Hexagonal and 12Sided Polygonal Voltage Space Vectors.
 Rajeevan P.P:PhD,May.2012.Investigations on hybrid multilevel power converter topologies and control schemes for AC drives.
 Anubrata Dey:PhD,Dec.2012.Investigations on online boundary variation techniques for nearly constant switching frequency hysteresis PWM controller for multilevel inverter fed IM drives.
 K.Mathew:PhD,Aug..2013.Induction Motor Drives Based on Multilevel Dodecagonal and Octadecagonal Voltage Space Vectors
 Najath Abdul Azeez:PhD,Jan.2014.Studies on Current Hysteresis Controllers And Low Harmonic Suppression Techniques for IM Drives with Dodecagonal Voltage Space Vectors
 Jaison mathew:PhD,Jan.2014.Investigation on Dodecagonal Multilevel Voltage Space Vector Structures by Cascading Flying Capacitor and Floating Hbridge Cells for Medium Voltage IM Drives
 Roshan Kumar pappu:PhD,Aug.2014.Studies on Single DC link Fed MultilevelInverter Topologies Using Flying Capacitor And Floating Capacitor Fed HBridges
 Sudharshan kaarthik:PhD,Aug.2015. Multilevel Dodecagonal Space Vector Structures and Modulation Schemes with Hybrid Topologies for Variable Speed AC drives
 Arun rahul:PhD,Dec.2016. Invetigations on hybrid multilevel inverters witha single DC supply for zero and reduced common mode voltage operation and extended linear modulation range operation for induction motor drives
 Sumit kumar Pramanick:PhD,Jan.2017. Switched capacitive filtering scheme for harmonic suppression in variable speed Ac drives
 Mathews Boby:PhD Aug.2017. Multilevel dodecagonal and octadecagonal voltage space vector structures with a single DC supply using basic inverter cells.
Present PhD Students :
 Apurv Yadav (Ph.D.)
 Krishna Raj(Ph.D.)
 Viju Nair (Ph.D.)
 Mohammed Imthiaz (Ph.D.)
 Mrigangu Ghosh