Ramakrishna Gokaraju

Biography

Assistant Professor, Electrical & Computer Engineering, University of Saskatchewan, 2003 -

Staff Software Engineer, IBM Toronto Lab, Toronto, 2000 - 2002.

Research Scientist - II, Alberta Research Council, Calgary, 1999 - 2000.

M.Sc. & PhD, University of Calgary, Calgary, 1994 - 2000.

Research Associate, Centre of Artificial Intelligence, Regional Engineering College, Rourkela, India, 1992 - 1994.

Junior Research Fellow, Indian Institute of Technology, Kanpur, India, 1992.

Graduate Engineer, Larsen & Toubro Ltd.- ECC, Madras, India, 1992.

Bachelor of Engineering, Regional Engineering College, Trichy, India, 1988 - 1992.

Contact

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Phone:

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Research Projects

Current Projects:
1. Co-ordinated Generator Protection & Control.
2. Damping of Sub-synchronous Resonance using Static Synchronous Series Compensator.
3. Development of an Energy Equilibrium Directly in the Time-Domain to Detect Out-of-Step Condition in Power Systems.
4. Phasor Estimation Technique to Minimize the Impact of CCVT Transients in Distance Protection
5. Voltage Instability Prevention Algorithm to Detect Time to Voltage Collapse
6. Pre-processing of Current and Voltage Samples for an Improved Neural Network Based Distance Relay

Teaching

EE868

Digital Techniques for Power System Measurements

MAJOR TOPICS:
1. Introduction to Power System Protection & Automation
2. Introduction to Digital Techniques for Power System Measurements & Protection
3. Analog Filters & Switched Capacitor Filters
4. A/D Converters
5. Power System Relaying Technology
6. Microprocessors & Digital Signal Processors
7. Relaying Algorithms
-Phasor Type: Fourier, Least Squares, Trignometric, Kalman filtering.
- Other types: Pattern Recognition, Neural Networks, Wavelet Transform.

http://www.engr.usask.ca/classes/EE/868/

EE442

Power System Operation & Control

This course looks at economic dispatch; the lossless case; inequality constraints; consideration of transmission losses; unit commitment; system control; control loops; the automatic voltage regulator; automatic load frequency control of a single-area system; implementation using computers; system protection; subsystems and attributes; zones of protection; transducers; relay design; protection of lines; transformers; generators and busbars; and microprocessor-based relays.

http://www.engr.usask.ca/classes/EE/442/

EE444

Electric Machines II

This course provides a more in-depth discussion of electric machines, the power electronics based control of electric machines and the study of dynamic behavior of electric machines. The topics include: transformers (magnetizing inrush, differential protection). synchronous machines (steady-state stability, frequency-power and voltage-reactive power characteristics, transients), single-phase induction motors, induction generators, special machines (brushless dc motors, variable reluctance and stepping motors), power electronic drives for speed and torque control of machines, dc machine and synchronous generator dynamics.

http://www.engr.usask.ca/classes/EE/444/

EE341

Electric Machines I

This course deals with the steady-state theory of electric machines. The topics include: transformers (equivalent circuit, autotransformers, three-phase transformers), synchronous machines (equivalent circuit, power-angle and other operating characteristics, starting of synchronous motors), three-phase induction motors (equivalent circuit, torque-speed curve, efficiency calculations, starting methods, speed control), and dc machines (armature windings, commutation, armature reaction, shunt and series dc machines).

http://www.engr.usask.ca/classes/EE/341/

EE898

Selected Topics:
Neural Networks - Theory & Applications
(Currently not Offered)

Course Outline (Topics):

1. Artificial Intelligence and Neural Networks.
2. Learning Processes.
3. Single Layer Perceptrons.
4. Multilayer Perceptrons.
5. Radial Basis Function Networks.
6. Self-Organizing Maps.
7. Dynamically Driven Recurrent Networks.
8. Fuzzy Sets and Introduction to Fuzzy Neural Networks.
9. Applications: Power System Control & Fault Diagnosis, System Identification, Model Reference Adaptive Control.

http://www.engr.usask.ca/classes/EE/898/

Graduate Students

Eli Pajuelo

Tara Alzahawi

Gaganpreet Chawla

Bipul Karki

Sumit Paudyal

Dipendra Rai

Trevor Sawatzky

Mariya Babiy

Terrence Munroe

Former Graduate Students

Eli Pajuelo

Jaimit Jani

Selected Journal Papers Copyright Infomation

[17]	E. Pajuelo, G. Ramakrishna, M.S. Sachdev, Loss of Excitation Protection for Synchronous Generators Using a Support Vector Machine Technique, IEEE Transactions on Energy Conversion. Manuscript Id No.: TEC-00418-2008, October 2008, No. of pages: 8.
[16]	S. Paudyal, G. Ramakrishna, M.S. Sachdev, Application of Equal Area Criterion Conditions in the Time Domain for Out-of-Step Protection, IEEE Transactions on Power Delivery, July 2008, No. of Pages: 9. rev.
[15]	S.O. Faried, G. Ramakrishna, D. Rai, A. Edris, Impact of Imbalanced Phase Operation of SSSC on Damping Subsynchronous Resonance, IEEE Transactions on Power Delivery. Manuscript Id No.: TPWRD 00503-2008, June 2008.
[14]	S. Paudyal, G. Ramakrishna, M.S. Sachdev, S. Cheng, Out-of-Step Detection using Energy Equilibrium Criterion in Time Domain, Electric Components and Power Systems, Vol. 37, No. 7, July 2009, No. of Pages: 27.
[13]	R. Billinton, B. Karki, R. Karki, G. Ramakrishna, Unit Commitment Risk Analysis of Wind Integrated Power Systems, IEEE Transactions on Power Systems, January 2009, Accepted, No. of pages: 11.
[12]	E. Pajuelo, G. Ramakrishna, M.S. Sachdev, Phasor Estimation Technique to reduce the impact of coupling capacitor voltage transformer transients, IET Generation, Transmission & Distribution (Previously IEE Proceedings – C Generation, Transmission & Distribution), Vol. 2, No. 4, July 2008, pp. 588-599.
[11]	G. Ramakrishna, O.P. Malik, Radial Basis Function Identifier and Pole-Shift Controller for Power System Stabilizer Application, IEEE Transactions on Energy Conversion, vol. 19 no. 4, ISSN 0885-8969, December 2004, pp. 663-670.
[10]	G. Ramakrishna, O.P. Malik, Implementation and Experimental Studies of a Self-Tuning PSS Using ADALINE-Identifier and Pole-Shift Controller, Journal of Intelligent Systems, Freund and Pettman, England, vol. 13 no. 4, October 2004, ISSN: 0334-1860, pp. 173-197.
[9]	G. Ramakrishna, N.D. Rao, Adaptive Neuro-Fuzzy Inference System (ANFIS) for Volt/var Control in Distribution Systems, Journal of Electric Power Systems Research, vol. 49, 1999, pp. 87-97.
[8]	G. Ramakrishna, N.D. Rao, A Fuzzy Inference System to Assist the Operator in Reactive Power Control in Distribution Systems, IEE Proc. Part - C (Generation, Transmission and Distribution), vol. 2 no. 145, pp. 132-138, March 1998.
[7]	K.A. El-Metwally, N.D. Rao, O.P. Malik, G. Ramakrishna, Application of a Neural Network as an Integrated Excitation Controller, Journal of Electric Power Systems Research, vol. 42 no. 2, pp. 121-126, 1997.
[6]	E.A. Mohamad, M.M. Mansour, S. El-Debeiky, K.G. Mohamad, N.D. Rao, G. Ramakrishna, Results of Egyptian Unified Grid Hourly Load Forecasting using an ANN with Expert System Interface, Journal of Electric Power Systems Research, vol. 39 no. 3, pp. 171-177, 1996.
[5]	P.K. Dash, A.C. Liew, S. Rahman, G. Ramakrishna, Building a Fuzzy Expert System for Electric Load Forecasting Using a Hybrid Neural Network, Journal on Expert Systems With Applications, vol. 9 no. 3, pp. 407-421, 1995.
[4]	P.K. Dash, A.C. Liew, G. Ramakrishna, Power-Demand Forecasting using a Neural Network with an Adaptive Learning Algorithm, IEE Proc. Part - C (Generation, Transmission and Distribution), vol. 142 no. 6, pp. 560-568, 1995.
[3]	P.K. Dash, G. Ramakrishna, A.C. Liew, S. Rahman, Fuzzy Neural Networks for Time-Series Forecasting of Electric Load, IEE Proc. Part - C (Generation, Transmission and Distribution), vol. 142 no. 5, pp. 535-544, 1995.
[2]	P.K. Dash, G. Ramakrishna, A.C. Liew, S. Rahman, An Improved Neural Network Approach for Weather Sensitive Short-Term Load Forecasting, Int. Journal on Engineering Intelligent Systems, vol. 2 no. 3, pp. 185-199, 1994.
[1]	P.K. Dash, S. Dash, G. Ramakrishna, S. Rahman, Forecasting of a Load Time Series using a Fuzzy Expert System & Fuzzy Neural Networks, Int. Journal on Engineering Intelligent Systems, vol 1 no 2, pp. 103-118, 1993.

Conference Publications Copyright Infomation

[27]	T. Alzahawi, M.S. Sachdev and R. Gokaraju, 2007. “Tracking Thévenin Parameters During Power System Steady-State Operation”, International Conference on Advanced Power System Automation and Protection (APAP) (CD-ROM), Jeju, Korea, Paper No. APAP2007-542,
[26]	April 24-27, 5 pages.
[25]	G. Chawla, M.S. Sachdev and R. Gokaraju, 2007. “A Novel Algorithm for the Design of Distance Relays for the Protection of Transmission Lines”, International Conference on Advanced Power System Automation and Protection (APAP) (CD-ROM), Jeju, Korea, Paper No. APAP2007-503, April 24-27, 6 pages.
[24]	E. Pajuelo, R. Gokaraju and M.S. Sachdev, 2007. “Study of CCVT Transient Behavior and a Procedure to Minimize the Impact of CCVT Transients in Distance Protection”, International Conference on Advanced Power System Automation and Protection (APAP) (CD-ROM), Jeju, Korea, Paper No. APAP2007-568, April 24-27, 5 pages.
[23]	E. Pajuelo, R. Gokaraju and M.S. Sachdev, 2006. “A Least Squares Algorithm to Overcome the Effect of CCVT Transients and the Algorithm Sensitivity to CCVT Parameter Variations”, 14th National Power Systems Conference (NPSC-2006) (CD-ROM), Indian Institute of Technology, Roorkee, India, Paper No. 75, December 27-29, 6 pages.
[22]	E. Pajuelo, G. Ramakrishna and M.S. Sachdev, 2006. “A Least Squares Algorithm to Overcome the Effect of CCVT Transients and the Algorithm Sensitivity to CCVT Parameter Variations”, Proceedings of the 14th National Power Systems Conference, Roorkee, India, December.
[21]	G. Chawla, M.S. Sachdev and G. Ramakrishna, 2006. “Design, Implementation and Testing of an Artificial Neural Network Based Admittance Relay”, Proceedings of the 2006 IFAC Symposium on Power Plants and Power Systems Control, Kananaskis, Alberta, June 25-28, No. 538.
[20]	G. Ramakrishna and O.P. Malik, 2006. “Experimental Studies on a Proto-Type Power System Using an Adaptive PSS”, Proceedings of the 2006 IFAC Symposium on Power Plants and Power Systems Control, Kananaskis, Alberta, June 25-28, No. 550.
[19]	A.M.G. Solo, G. Ramakrishna and R.J. Sarfi, 2006. “A Knowledge-Based Approach for Network Radiality in Distribution System Reconfiguration”, Proceedings of the 2006 IEEE Power Engineering Society (PES) General Meeting, Montreal, Quebec, June 18-22, No. 1-4244-0493-2.
[18]	E. Pajuelo G. Ramakrishna M.S. Sachdev, 2005, "An Improved Voltage Phasor Estimation Technique to Minimize the Impact of CCVT Transients in Distance Protection", Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, May 1-4, Saskatoon, Canada, pp. 0454-0457. [PDF]
[17]	Gaganpreet Chawla, Mohinder S. Sachdev and G. Ramakrishna, 2005, "ARTIFICIAL NEURAL NETWORK APPLICATIONS FOR POWER SYSTEM PROTECTION", Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, May 1-4, Saskatoon, Canada, pp. 1954-1957. [PDF] (3MB)
[16]	Tara Alzahawi, Mohindar S. Sachdev and G. Ramakrishna, 2005, "A SPECIAL PROTECTION SCHEME FOR VOLTAGE STABILITY PREVENTION", Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, May 1-4, Saskatoon, Canada, [PDF]
[15]	G. Ramakrishna, O.P. Malik, On-Line Identification of Synchronous Generator Using a RBF Network, Conference Proceedings, North American Power Symposium, Waterloo, Canada, October 2000, pp. 8-27 to 8-34.
[14]	G. Ramakrishna, O.P. Malik, Radial Basis Function Based Identifiers For Adaptive PSSs in a Multi-Machine Power System, Conference Proceedings, IEEE Power Engineering Society Summer Meeting, Seattle, July 2000, Vol. 1, July 2000, Seattle, pp. 116-121.
[13]	G. Ramakrishna, O.P. Malik, PSS For Multi-Machine Power System Using Adaptive ADALINE-Identifier and Pole-shift Control, Conference Proceedings, IFAC Symposium on Power Plants & Power Systems Control 2000, Brussels, Belgium, May 2000, pp. 216-221.
[12]	G. Ramakrishna, O.P. Malik, Adaptive Control of Power Systems Using Radial Basis Function Network Identification and Predictive Control Calculations, Conference Proceedings, IEEE Power Engineering Society Summer Meeting, Edmonton, Alberta, July 1999, pp. 989-994.
[11]	G. Ramakrishna, O.P. Malik, RBF Identifier and Predictive Controller For Multi-Machine Power System, Conference Proceedings, IEEE Power Engineering Society Summer Meeting, Edmonton, Alberta, July 1999, pp. 1231-1235.
[10]	G. Ramakrishna, O.P. Malik, Adaptive PSS with Radial Basis Function Network Identification and Pole-shift Control, Conference Proceedings, 14th World Congress of International Federation of Automatic Control (IFAC), Beijing, China, July, 1999, vol O - Power Systems, Biotechnological Processes, Fault Detection, pp. 231-236.
[9]	G. Ramakrishna, O.P. Malik, RBF Identifier and Pole-shifting Controller For PSS Application, International Electric Machines Drives Conference (IEMDC), Seattle, Washington, May 1999, pp. 589-591.
[8]	G. Ramakrishna, N.D. Rao, Implementation of a Fuzzy Logic Scheme for Q/V Control in Distribution Systems, IEEE Power Engineering Society Winter Meeting, New York, Jan. 1999, pp. 1316-1321.
[7]	G. Ramakrishna, O.P. Malik, On-Line Identification of Synchronous Generator Using a ADALINE Network, 10th National Power Systems Conference (NPSC '98), Baroda, India, Oct. 1998, pp. 410-414.
[6]	G. Ramakrishna, N.D. Rao, A Fuzzy Logic Framework for Control of Switched Capacitors in Distribution Systems, Proceedings of the Canadian Conference on Electrical & Computer Engineering, Montreal, Sept. 1995, pp. 676-679.
[5]	P.K. Dash, J.K. Satpathy, G. Ramakrishna, S. Rahman, Power Demand Forecasting using a Neural Network with an Adaptive Learning Algorithm, 17th National Systems Conference, Kanpur, Dec. 1993, pp. 514-517.
[4]	P.K. Dash, J.K. Satpathy, G. Ramakrishna, S. Rahman, A Fuzzy Neural Network for Electric Load Forecasting, 9th National Convention of Electrical Engineers and Continuing Education Program, Bangalore, November 1993, pp. 199-207.
[3]	P.K. Dash, G. Ramakrishna, J.K. Satpathy, S. Rahman, A Fuzzy Observer for Neural Network Based Load Forecast, Symposium on Intelligent Systems, IEEE Bangalore Section, November 1993, pp. 50-55.
[2]	P.K. Dash, G. Ramakrishna, H.P. Khincha, Sliding Mode Fuzzy Control for Flexible AC Transmission Systems, The Third International Symposium on Electricity Distribution & Energy Management, Singapore, pp. 485-490, Oct. 1993.
[1]	G. Ramakrishna, R. Srinivasagopalan, An Expert System Operational Aid for Restoration of Power Distribution Systems - A New Approach, Expert Systems in Engineering, Hyderabad (India), Jan. 10-22, 1992, pp. 3.6.1-3.6.5

Honours and Awards

Natural Sciences & Engineering Research Council (NSERC) of Canada Post-Doctoral Industrial Research Fellowship (IRF), January 2000.

Izaak Walton Killam Memorial Scholarship, Highest Academic Award for Doctoral Studies, The University of Calgary, 1998-2000.

Alberta Research Council Scholarship, 1996-1997.

Merit Scholarship, Regional Engineering College, Trichy, India, 1988-1992.