Ramakrishna Gokaraju

     Ramakrishna Gokaraju  B.E., M.Sc., Ph.D.

    Professor of Electrical & Computer Engineering

    Biography

    Ramakrishna (Rama) Gokaraju graduated with Distinction in Electrical and Electronics Engineering in April 1992 from the Regional Engineering College (National Institute of Technology), Trichy, India. He obtained M.Sc. and Ph.D. degrees in Electrical & Computer Engineering from the University of Calgary, Calgary, Canada in June 1996 and May 2000, respectively. He joined the Department of Electrical & Computer Engineering at the University of Saskatchewan as an Assistant Professor in July 2003, received tenure/Associate Professorship in July 2009, and became a professor July 1, 2015.

    During his sabbatical leave (2009-2010 academic year), Dr. Gokaraju worked as a Visiting Professor in the Power Simulations Laboratory, Department of Electrical & Computer Engineering, University of Manitoba, Winnipeg, Canada. During his sabbatical leave (Jan-June, 2014), he was a visiting professor with Power Research & Development Consultants (PRDC), Bangalore, India and the University of Queensland, Brisbane, Australia. 

    During the period 1992-1994, he first worked at Larsen & Toubro-ECC, Madras, India as a Graduate Engineer, Indian Institute of Technology, Kanpur, India as a Project Associate, and then at the Center of Energy Management Systems, Regional Engineering College, Rourkela, India in an INDO-US Project as a Research Engineer.

    During the period 1999-2002, he worked at the Alberta Research Council, Calgary, Canada as a Research Scientist and IBM Toronto Lab, Toronto, Canada as a Staff Software Engineer.

    Dr. Gokaraju is a registered professional engineer in the Province of Saskatchewan.

    Dr. Gokaraju's current areas of research are in Smart Grids (PMU based solutions for Wide Area Protection, Control & Transient Stability Protection), Real Time Power Systems Simulations, Modeling of Wind Generator & PV Systems, and Interrelated Phenomenon Related to Generator Protection & Control.

    Publications

    Selected Journal Papers

    [22]  Karmacharya, Indra Man, Gokaraju Ramakrishna (2017), “Fault Location in Ungrounded Photovoltaic System Using Wavelets and ANN,”, IEEE Transactions on Power Delivery, pp. 1-10. Digital Object Identifier: 10.1109/TPWRD/2017.2721903, Accepted: June 2017. IEEE Early Access. http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7962199
    [21] Jin, Xingxing (Shane), Gokaraju, R.,  Wierckx, R., Nayak, O. (2017). High Speed Digital Distance Relaying Scheme using FPGA and IEC 61850, IEEE Transactions on Smart Grid, Accepted: January 2017. http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7827152[GR1]
    [20]  Kang, D. and Gokaraju, R. (2016). A New Method for Blocking Third Zone Distance Relays during Stable Power Swings, IEEE Transactions on Power Delivery, Special Issue on Frontiers in Power System Protection, August 2016, Date of Publication: 21
    January 2016, http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7389417
    [19] Zacharias, D. and Gokaraju, R. (2015). Prototype of a Negative Sequence Turn-to-Turn Fault Detection Scheme for Transformers, IEEE Transaction on Power Delivery, Accepted 1 May, 2015. pp 1-8.
    [18] Chandrasekar, S. and Gokaraju, R. (2015). Dynamic Phasor Modeling of Type 3 DFIG Wind Generators (including SSCI Phenomenon) for Short Circuit Calculations, IEEE Transaction on Power Delivery,  April 2015. pp 887-897, IEEE XPlore: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6939685.
    [17] Malhotra, U., Gokaraju, Ramakrishna (2013). An Add-on Self Tuning Control System for a UPFC Application, IEEE Trans. on Industrial Electronics, vol. 61, no. 5, May 2014, pp. 2378-2388. IEEE XPlore (http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=06555901)
    [16] Rai, D., Gokaraju, Ramakrishna, and Faried, S.O. (2013). Adaptive Control Using Constrained RLS and Dynamic Pole-shift Technique for TCSCs, IEEE Transactions on Power Delivery, vol. X, no. X, July 2013 (Accepted), pp. 1-11. http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6600950&sortType%3Dasc_p_Sequence%26filter%3DAND%28p_IS_Number%3A4359248%29
    [15] Raman, S., Gokaraju, Ramakrishna, and Jain, A. (2013). An Adaptive Fuzzy Mho Relay for Generator Phase Backup Protection with Infeed from STATCOM, IEEE Transactions on Power Delivery, vol. 28, no. 1, January 2013, pp. 120-28. http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6381504
    [14] Shrestha, B., Gokaraju, Ramakrishna, and Sachdev, M.S. (2013). Out of Step Protection Using State Plane Trajectories Analysis, IEEE Transactions on Power Delivery, vol. 28, no. 2, April 2013, pp. 1083-1093. http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6471270
    [13] Pajuelo, E., Gokaraju, Ramakrishna, and Sachdev, M.S. (2013). Identification of Generator Loss of Excitation from Power Swing Conditions Using a Fast Pattern Classification Method, IET – Generation, Transmission & Distribution, vol. 7, no. 1, pp. 24-36. http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6484228&sortType%3Dasc_p_Sequence%26filter%3DAND%28p_IS_Number%3A6484224%29
    [12] Rai, D., Faried, S.O., Gokaraju, Ramakrishna and Edris, A. (2012). An SSSC-Based Hybrid Series Compensation Scheme Capable of Damping Subsynchronous Resonance, IEEE Transactions on Power Delivery, vol. 27 no. 2, April 2012, pp. 531-540.
    [11] Rai, D., Faried, S.O., Gokaraju, Ramakrishna and Edris, A. (2011). Damping Inter-Area Oscillations using Phase Imbalanced Series Compensation Schemes, IEEE Transactions on Power Systems, 26(3), 1753-1761.
    [10] Elsamahy, M., Faried, S.O., Sidhu, T.S. and Gokaraju, Ramakrishna (2011). Enhancement of the Coordination between Generator Phase Backup Protection and Generator Capability Curves in the Presence of a Midpoint STATCOM using Support Vector Machines, IEEE Transactions on Power Delivery, 26(3), 1841-1853.
    [9] Gokaraju, Ramakrishna and Malik, O.P. (2010). Adaptive PSS using a simple on-line identifier and linear pole-shift controller, Electric Power System Research, 80(4), 406-416.
    [8] Jalla, U., Gupta, C.P.,Singh, G.K. and Gokaraju, Ramakrishna (2010). PSO and ANN-based Fault Classification for Protective Relaying, IET Generation, Transmission and Distribution, Special Issue on Wide Area Monitoring, Protection and Control, 4(10, September), 1197-1212.
    [7] Paudyal, S., Gokaraju, Ramakrishna and Sachdev, M.S. (2010). Application of Equal Area Criterion Conditions in the Time Domain for Out-of-Step Protection, IEEE Transactions on Power Delivery, 25(2), 600-609.
    [6] Paujelo, E., Gokaraju, Ramakrishna and Sachdev, M.S. (2010). Strengths and Limitations of a New Phasor Estimation Technique to Reduce CCVT Impact in Distance Protection, Electric Power System Research, 80(4), 417-425.
    [5] Rai, D., Faried, S.O., Gokaraju, Ramakrishna and Edris, A.A. (2010). Hybrid Series Compensation Scheme Capable of Damping Subsynchronous Resonance, IET Generation, Transmission & Distribution, 4(3), 456-466.
    [4] Rai, D., Gokaraju, Ramakrishna, Faried, S.O. and Edris, A. (2010). Enhancement of Power System Dynamics Using Phase Imbalanced Series Compensation Concept, IEEE Transactions on Power Systems, 25(2), 966-974.
    [3]  Billinton, R., Karki, B., and Gokaraju, Ramakrishna (2009). Unit Commitment Risk Analysis of Wind Integrated Power Systems, IEEE Trans. on Power Systems, 20(2), 930-939.
    [2] Paudval, S., Gokaraju, Ramakrishna, Sachdev, M.S., and Cheng, S. (2009). Out-of-Step Detection using Energy Equilibrium Criterion in Time Domain, Electric Power Components and Systems, Special Issue, 37(7), June, 714-739.
    [1] E. Pajuelo, Ramakrishna Gokaraju, M.S. Sachdev, (July 2008). "Phasor Estimation Technique to reduce the impact of coupling capacitor voltage transformer transients," IET Generation, Transmission & Distribution, Vol. 2, No. 4, July, pp 588-599.

    Patents

    [5] Binod Shrestha, Ramakrishna Gokaraju, Apparatus and Method for Out-of-Step Protection Using the Analysis of Trajectories of Electrical Measurements in State Plane, Patent filed July 24, 2013 (Canada -- patent application serial number: 2783755, US patent application with serial number: 13/949,629, Australia patent application with serial number: 2012206985).
    [4] Binod Shrestha, Parikshit Sharma, Ramakrishna Gokaraju, Methods and Apparatus for Detection of Transient Instability and Out-of-Step Conditions by State Deviation, USA Provisional Patent Application, May 6, 2013.
    [3] Eli Pajuelo, Ramakrishna Gokaraju, Methods and Apparatus for Detecting Generator Faults, USA Provisional Patent Application, February 4, 2013.
    [2] Adaptive Control Technique for Transmission Line Control Devices to Handle Large Disturbance Scenarios, USA Provisional Patent Application, March 13, 2013.
    [1] Network Radiality in Reconfiguration of a Radial Power Distribution System Using a Matrix-Structured Knowledge-Based System. U.S.A. Patent #8,041,464, October 18, 2011.

    Conference Publications

    [33] [Past Five Years]
    [32] Gokaraju, Ramakrishna. Transient Stability Prediction Using the Analysis of Trajectories in State Plane, Panel Presentation (Panel 5: Real Time Simulation and Analysis Approaches, http://www.ieee-isgt-2013.eu/program.html), IEEE Innovative Smart Grid Technologies Conference, Copenhagen, Denmark, Oct. 6-9, 2013. pp. 1-5. Part of the presentation appears in the ISGT'13 conference proceedings: Shrestha, B., Sharma, P., Gokaraju, R. Out-of-Step Protection Using the Analysis of Electrical Power Vs Speed Deviation in State Plane, Panel Paper, IEEE Innovative Smart Grid Technologies Conference, Copenhagen, Denmark, Oct. 6-9, 2013. pp. 1-5.
    [31] Raman, S., Gokaraju, Ramakrishna, and Jain, A. (2013). An Adaptive Fuzzy Mho Relay for Generator Phase Backup Protection with Infeed from STATCOM, IEEE Transactions Paper Presentation, 2013 IEEE Power and Energy Society General Meeting, Vancouver, Canada July 21-25 2013. pp. 1-10.
    [30] Sharma, P., Gokaraju, Ramakrishna (2012). Transient Stability Studies on Power Systems with Large Penetration of Wind Power, 2012 IEEE Electrical Power Engineering Society General Meeting, Poster, San Diego, U.S.A. July 2012.
    [29] Chandrasekar, S., Gokaraju, Ramakrishna (2012). Short Circuit Analysis of Wind Turbine Generators, 2012 IEEE Electrical Power Engineering Society General Meeting, Poster, San Diego, U.S.A. July 2012.
    [28] Maddela, G., Gokaraju, Ramakrishna (2012). Loss Minimization in Transmission Systems Using Power Flow Controllers, 2012 IEEE Electrical Power Engineering Society General Meeting, Poster, San Diego, U.S.A. July 2012.
    [27] Babiy, M., Gokaraju, Ramakrishna, Garcia, J.C. (2011). Turn-to-Turn Fault Detection in Transformers Using Negative Sequence Currents, Proceedings of the 2011 IEEE Electrical Power and Energy Conference, Winnipeg, Canada. pp. 1-6. (CD Rom).
    [26] Malhotra, U., Gokaraju, Ramakrishna and Muthumuni, D. (2011). An Adaptive Supplementary Controller for a UPFC, International Conference on Power System Transients, Delft, The Netherlands, June 14-17, Paper No. 192, 1-6 (CD Rom).
    [25] Pajuelo, E., Gokaraju, Ramakrishna and Sachdev, M.S. (2011). Coordination of Underexcitation Limiter, Loss of Excitation Protection and Generator Control, IEEE PES General Meeting, July 25-28, Paper No. 5137.
    [24] Shrestha, B., Gokaraju, Ramakrishna and Sachdev, M.S. (2011). Fast Out-of-Step Detection in Large Power Systems Using State Plane Analysis, IEEE PES General Meeting, Detroit, MN, U.S.A., July 25-28, Paper No. 5082.
    [23] Rai, D., Faried, S.O., Gokaraju, Ramakrishna and Edris, A. (2011). Impact of Imbalanced Phase Operation of SSSC on Damping Subsynchronous Resonance, Proceedings of the IEEE 2011 Power and Energy Society General Meeting, Detroit, Michigan, USA, July 24-29, (CD Rom).
    [22] Gokaraju, Ramakrishna, Rai, D. and Gole, A.M. (2010). Model-Reference Adaptive Control of Power System Stabilizers Using Surrogate Type Modeling Concepts, National Power Systems Conference, Hyderabad, India, December 15-17, 1-6 (CD Rom).
    [21] Rai, D., Gokaraju, Ramakrishna and Faried, S.O. (2010). Model Reference Adaptive Control of FACTS, National Power Systems Conference, Hyderabad, India, December 15-17, 1-6 (CD Rom).
    [20] Babiy, M. and Gokaraju, Ramakrishna (2010). Detecting Minor Internal Faults in Transformers Using Negative Sequence Currents, Poster Presentation, IEEE Power Engineering Society General Meeting, Minneapolis, July 25-29.
    [19] Fentie, D., Gokaraju, Ramakrishna and Faried, S.O. (2010). Transient Modeling of the Sen Transformer, Poster Presentation, IEEE Power Engineering Society General Meeting, Minneapolis, U.S.A., July 25-29.
    [18] Rai, D., Gokaraju, Ramakrishna and Faried, S.O. (2010). Model Reference Adaptive Control of FACTS, Poster Presentation, IEEE Power Engineering Society General Meeting, Minneapolis, July 25-29.
    [17] Sawatzky, T., Gokaraju, Ramakrishna and Faried, S.O. (2010). Application of Support Vector Machines to Identify a Loss of Excitation Condition on a Power System, Poster Presentation, IEEE Power Engineering Society General Meeting, Minneapolis, July 25-29.
    [16] Shrestha, B., Gokaraju, Ramakrishna and Sachdev, M.S. (2010). Out-of-Step Protection Using State Plane Analysis, Poster Presentation, IEEE Power Engineering Society General Meeting, Minneapolis, July 25-29.
    [15] Elsamahy, M., Faried, S.O. and Gokaraju, Ramakrishna (2010). Impact of Midpoint STATCOM on the Coordination between Generator Distance Phase Backup Protection and Generator Capability Curves, 2010 IEEE Power & Energy Society General Meeting (PES GM), Minneapolis, Minnesota USA, July 25-29, Paper No. 1138.
    [14] Pan, S., Rai, D., Faried, S.O. and Gokaraju, Ramakrishna (2011). Damping Power System Oscillations Using a Hybrid Series Capacitive Compensation Scheme, IEEE Trondheim PowerTech 2011, Trondheim, Norway, June 19-23, (CD Rom).
    [13] Pajuelo, E., Gokaraju, Ramakrishna and Sachdev, M.S. (2010). Coordination of Overexcitation Limiter, Field Overcurrent Protection and Generator Control, IEEE PES General Meeting, Minneapolis, USA, July 25-29, 2010, Paper No. 2010GM1560, Panel Paper, IEEE Excitation Systems & Control Subcommittee, 1-6 (CD Rom).
    [12] Babiy, M. and Gokaraju, Ramakrishna (2009). Detecting Internal faults in Transformers Using Negative Sequence Currents, IEEE PES General Meeting, Calgary, AB, Canada, July 26-30, Poster Presentation, Paper No. 4057.
    [11] Fentie, D., Gokaraju, Ramakrishna and Faried, S.O. (2009). Sen Transformer Protection, IEEE PES General Meeting, Calgary, AB, Canada, July 26-30, Poster Presentation, Paper No. 4012.
    [10] Malhotra, U. and Gokaraju, Ramakrishna (2009). An Adaptive Controller for FACTS Application, IEEE PES General Meeting, Calgary, AB, Canada, July 26-30, Poster Presentation, Paper No. 4079.
    [9] Pajuelo, E., Gokaraju, Ramakrishna and Sachdev, M.S. (2009). Loss of Excitation Protection for Generators Using a Support Vector Machine Technique, IEEE PES General Meeting, Calgary, AB, Canada, July 26-30, Poster Presentation, Paper No. 4034.
    [8] Sawatzky, T., Gokaraju, Ramakrishna (2009). Application of a Pattern Recognition Technique for Identifying Power Swing Conditions on a Power System with STATCOM, IEEE PES General Meeting, Calgary, AB, Canada, July 26-30, Poster Presentation, Paper No. 4075.
    [7] Karki, B., Billinton, R., Karki, R. and Gokaraju, Ramakrishna (2008). Load Carrying Capability Of Wind Integrated Power Systems, North American Power Symposium, Calgary, AB, Canada, Sep 28-30, (CD Rom).
    [6] Rai, D., Gokaraju, Ramakrishna, Faried, S.O. and Edris, A.A. (2008). A Novel Approach for Damping Subsynchronous Resonance Using a STATCOM, 15th National Power Systems Conference (NPSC), Indian Institute of Technology, Bombay, India, 16th-18th December, 2008, Paper No. Paper Id: 94, 1-6 (CD Rom).
    [5] Rai, D., Gokaraju, Ramakrishna, Faried, S.O. and Edris, A.A. (2009). Damping Subsynchronous Resonance Using a STATCOM Operating in a Phase Imbalanced Mode, IEEE PES General Meeting, Calgary, AB, Canada, July 26-30, Paper No. 09GM0749, 1-8 (CD Rom).
    [4] S. Paudyal, Ramakrishna Gokaraju, M.S. Sachdev, “Out-of-Step Protection using the Equal Area Criterion in the Time-Domain,” IEEE Region 10 Conference (TENCON’08), Hyderabad, India, Nov. 2008. No. of pages: 6.
    [3] Chawla, G., Sachdev, M.S. and Ramakrishna Gokaraju (2008). An Improved Distance Protective Relaying Technique for Transmission Lines, CIGRÉ Canada Conference on Power Systems, Winnipeg, October 19-21, 2008, Paper No. 540, 1-10 (CD Rom).
    [2] G. Chawla, M.S. Sachdev, Ramakrishna Gokaraju, “An Improved ANN Based Admittance Relay Using Pre-Processed Inputs,” IEEE INDICON, December 2008, Kanpur India, No. of pages: 6.
    [1] R. Billinton, B. Karki, R. Karki, Ramakrishna Gokaraju, “Operating Reserve Assessment of Wind Integrated Power Systems,” CIGRE Canada Conference on Power Systems, Winnipeg, October 19-21, 2008. No. of pages: 6.

    Honours and Awards

    Canadian Foundation for Innovation, Leaders Opportunity Fund, April 2012.
    http://news.usask.ca/2011/09/01/projects-awarded-more-than-780000-through-canada-foundation-for-innovation/

    Nominated during 2008-2009 academic year for the University of Saskatchewan Teaching Excellence Award, University of Saskatchewan Student's Union (USSU).

    Professor of the Year Award, IEEE Student Branch Department of Electrical & Computer Engineering, March 2008.

    Natural Sciences & Engineering Research Council (NSERC) of Canada Post-Doctoral Industrial Research Fellowship (IRF), January 2000.
    http://www.nserc-crsng.gc.ca/Students-Etudiants/PD-NP/Industrial-Industrielle_eng.asp

    Izaak Walton Killam Memorial Scholarship, PhD Studies, The University of Calgary, 1998-2000.
    http://www.killamtrusts.ca/index.asp

    Alberta Research Council Scholarship, 1996-1997.

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

    Research Grants

    [1]

    Natural Sciences & Engineering Research Council (NSERC) Discovery Grant, “Power Systems Protection, Control of Bulk Power and Renewable Energy Integrated Systems, and Real Time Simulations,” Principal Investigator 2015-2020.

    [2]

    Sylvia Fedoruk Canadian Centre for Nuclear Innovation, “Developing a Capacity to Understand Practical & Regulatory Issues of Siting an Advanced Technology,” Co-investigator. 2016-2020.

    [3]

    Canada Foundation for Innovation (CFI) John R. Evans Leaders Opportunity Fund (LOF), “Hardware-in-the-Loop Simulation Facility for Power System Control and Protection Studies,” Principal Investigator 2011.

    [4]

    Natural Sciences & Engineering Research Council (NSERC) Engage Grant (RTDS Technologies, Winnipeg, Canada), “High Speed Digital Distance Relaying Scheme Using FPGAs for Extra High Voltage Transmission Systems,” 2015-16.

    [5]

    Natural Sciences & Engineering Research Council (NSERC) Engage Grant (GE Digital Energy, Markham, Canada), “Wide Area Based Network Stability Analysis System,” 2015-16.

    [6]

    Natural Sciences & Engineering Research Council (NSERC) EngagePlus Grant (Littelfuse Startco, Saskatoon, Canada), "Fault Detection in Photovoltaic Systems and Electric Machinery," 2014-15.

    [7]

    Natural Sciences & Engineering Research Council (NSERC) Engage Grant (Hiatchi Power Systems Canada Ltd), "Control Schemes for Nuclear Generators," 2013-14.

    Graduate Students

    Graduate Students

    News:

    Xingxing (Shane) Jin received first prize for his student poster entitled “High Speed Digital Distance Relaying Scheme for Extra High Voltage Transmission Lines” in the student’s poster competition held during the IEEE Power & Energy Society General Meeting, July 17-21, 2016, Boston, MA, U.S.A. Shane is supervised by Prof. Ramakrishna (Rama) Gokaraju.

    http://engineering.usask.ca/news-events/news/2016/phd-candidate-wins-international-student-poster-competition.php     

    Xingxing Jin               Award    

    Xingxing (Shane) Jin

    PhD Student (2014-current)
    Saskatchewan Innovation Scholarship (2016-17)
    NSERC Discovery Grant Funding (2014-17)
    NSERC Engage Grant Funding (RTDS Technologies, 2015-16)

    Eli Pajuelo
    PhD Student
    NSERC Discovery Grant.
    U of S Graduate Scholarship Recipient.

    Eli's research is on Coordination of Generator Protection with Excitation Control.

    Eli is currently working as a consultant for GE Digital Energy, Markham, Canada.
    Don Kang
    Ph.D. Student
    Self-funded.

    Don's research is on Wide-Area Protection: Coordination of Zone 3 Protection with Power Swings.

    Don is currently working full-time with March Consulting.
    Jason Pannell
    M.Sc. Student
    NSERC Industrial Postgraduate Scholarship (IPS-1, SaskPower).
    Saskatchewan Innovation & Opportunity Scholarship
    Graduate Teaching Fellowship.

    Jason's research is on Power System Restoration (Issues Dealing with Generator Control & Protection) after Large Scale Blackouts.
    Shea Pederson
    M.Sc. Student
    NSERC Industrial Postgraduate Scholarship with Littelfuse Startco (IPS-1)
    NSERC Discovery Grant.

    Shea is working on Protection Issues Related to Ungrounded Low Voltage Photovoltaic Systems.
    Nataliia Petryshyn
    M.Sc. Student
    College of Graduate Studies Dean's Scholarship
    NSERC Engage Grant
    NSERC Discovery Grant

    Nataliia is working on Voltage Instability Protection Using PMU Data.
    Daniel Zacharias
    M.Sc. Student
    Self-Funded.

    Daniel is working on Digital Protection Using Negative Sequence Currents For Transformers.
    He is currently working as an engineer with Dynamo Electric.
    Trevor Sawatzky
    M.Sc. Student
    NSERC Industrial Postgraduate Scholarship Recipient with SaskPower.

    Trevor's research is on Coordination of Generator Protection with Excitation Control Systems and Transmission Line Controls.

    Trevor is currently employed full-time with the Plant Services Division in SaskPower.

    Former Graduate Students

    Dipendra Rai
    Ph.D. Student (Completed: April 2012. Supervisor: R. Gokaraju, Co-supervisor: S.O. Faried)
    NSERC Alexander Graham Bell Canada Graduate Scholarship
    Dean's Scholarship
    College of Engineering Haid Scholarship
    College of Engineering Research Top-Up Award
    Department Devolved Scholarship
    NSERC Engage Grant

    Dr. Rai's PhD dissertation was on Power System Dynamics Enhancement Through Phase Unbalanced and Adaptive Control Schemes in Series FACTS.

    Dr. Rai's is currently working as a Systems Planning Engineer, BC Hydro, Vancouver, Canada.
    Upendar Jalla
    Visiting PhD Student (September 2009-March 2010)
    Canadian Commonwealth Student Exchange Program
    Indian Institute of Technology, Roorkee, India

    Dr. Jalla's research at the University of Saskatchewan was on Developing A Kalman Filtering Technique To Reduce Impact of CCVT Transients on Distance protection.

    Dr. Jalla completed his PhD from IIT, Roorkee in December 2010. He is working as an engineer for GE CONVERTEAM (www.converteam.com), Chennai, India.
    Tara Alzahawi
    Ph.D. Student (Completed: March 2012. Supervisor: M.S. Sachdev, Co-supervisor: R. Gokaraju)
    NSERC Discovery Grant.
    Department Devolved Scholarship.

    Tara's PhD research was on Design and Implementation of a Special Protection Scheme to Prevent Voltage Collapse.

    Tara is currently working as a Senior Electrical Engineer for Hatch, Saskatoon.
    Gaganpreet (Ritu) Chawla
    Ph.D. Student (March 2010)
    Supervisor: M.S. Sachdev, Co-supervisor: R. Gokaraju)
    NSERC Discovery Grant.
    Department Devolved Scholarship.

    Dr. Chawla's PhD research was on Design and Implementation of ANN Based Phase Comparators Applied to Transmission Line Protection.

    Dr. Chawla is currently working as Director (Power & Controls) for March Consulting, Saskatoon.
    Bipul Karki
    Ph.D. Student (Completed: March 2010. Supervisor: R. Billinton, Co-supervisors: R. Karki, R. Gokaraju)

    Dr. Bipul Karki's thesis was on Impact of Wind Energy on Power System Security.

    Dr. Bipul Karki is currently working for Teshmont Consulting, Calgary, Canada.
    Gopiram Maddela
    M.Sc. Student (Completed: September 2013).
    College of Engineering Scholarships
    ECE Department Teaching Assistantships

    Gopi's MSc thesis was on Transmission Lines Loss Minimization Using Power Flow Controllers.
    Sriram Chandrasekar
    M.Sc. Student (Completed: August 2013)
    Funding: NSERC Discovery Grant, NSERC Engage Grant.

    Sriram's MSc thesis was on Short Circuit Models for Variable Speed Wind Turbine Generators.
    Parikshit Sharma
    M.Sc. Student (Completed: February 2012)
    Saskatchewan Innovation & Opportunity Scholarship
    NSERC Discovery Grant.

    Parikshit's MSc thesis was on Fast Methods for Transient Stability Prediction in Large Power Systems. He is currently working as a Grid Planning Engineer for Saskatchewan Power Corporation, Regina, Canada.
    Geoffrey Baker
    M.Sc. Student (Completed: August 2012)

    Geoff's MSc research was on Experimental Investigations for Proactive ARC Flash Detection Using Current and Voltage Measurements.

    Geoff is working as a R&D engineer with Littelfuse Startco.
    Binod Shrestha
    MSc Student (Completed: December 2011)
    Department Devolved Scholarship
    NSERC Discovery Grant.

    Binod's M.Sc. thesis was on "A Fast Method For Out of Step Protection Using State Plane Trajectories Analysis."

    Binod is currently working as a Network Development Engineer for Saskatchewan Power Corporation, Regina, Canada.
    Pradeep Reddy
    Visiting Master's Student (March 2012-August 2012)
    Canadian Commonwealth Student Exchange Program

    Pradeep's research at the University of Saskatchewan was on Damping of Low Frequency Oscillations Between Wind Turbine Generators and Series Compensated AC Transmission Lines.

    Pradeep completed his Master's degree from VNR Vignana Jyothi Institute of Science & Technology, Hyderabad, India. He has an offer employment to join Tata Consultancy Services, Hyderabad, India.
    Sivaramakrishnan Raman
    Visiting Master's Student (March 2011-September 2011)
    Canadian Commonwealth Student Exchange Program
    International Institute of Information Technology (IIIT), Hyderabad, India.

    Sivaramakrishnan's research at the University of Saskatchewan was on An Adaptive Fuzzy Mho Relay for Phase Backup Protection with Infeed from STATCOM.

    Siva completed his Master's degree from IIIT, Hyderabad in February 2012. He is working as an engineer for GE Energy, Hyderabad Technology Center, Hyderabad India.
    Ele Srinivas
    Visiting Master's Student (February 2011-August 2011)
    Canadian Commonwealth Student Exchange Program
    International Institute of Information Technology (IIIT), Hyderabad, India.

    Ele's research at the University of Saskatchewan was on A Fuzzy Scheme For Loss of Excitation Protection.
    Saradha Srinivasan
    MSc Student (Completed: June 2011)
    Self-funded.

    Saradha's M.Sc. thesis was on A Functional Link Network Based Adaptive Power System Stabilizer.
    Urvi Malhotra
    MSc Student (Completed: April 2011)
    Department Devolved Scholarship
    NSERC Discovery Grant.

    Urvi Malhotra's M.Sc. thesis was on An Adaptive add-on Control System For A Unified Power Flow Controller.

    Urvi Malhotra is currently working as a Network Management Engineer in the Grid Control Center, Saskatchewan Power Corporation, Regina, Canada.
    Sushan Pan
    MSc Student (Completed: October 2010. Supervisor: S.O. Faried, Co-supervisor: R. Gokaraju)
    NSERC Discovery Grant.

    Sushan's M.Sc. thesis was on Damping Power System Oscillations Using A Phase Imbalanced Hybrid Series Capacitive Compensation Scheme.

    Sushan is currently working as an Engineer for AMEC, Saskatoon, Canada.
    Mariya Babiy
    MSc Student (Completed: August 2010)
    Teaching Assistantships
    NSERC Discovery Grant.

    Mariya's M.Sc. thesis was on Turn-to-Turn Fault Detection in Transformers Using Negative Sequence Currents.

    Mariya is currently working as an Engineer for ATCO Electric, Edmonton, Canada.
    Donald Fentie
    MSc Student (Completed: August 2010, Supervisor: R. Gokaraju, Co-supervisor: S.O. Faried)
    NSERC Industrial Postgraduate Scholarship with Magna Electric Corporation

    Donald Fentie's M.Sc. thesis was on Transient Modeling and Protection of the SEN Transformer.

    Donald Fentie is currently working as an Applications Engineer for Schweitzer Engineering Laboratories (SEL), Pullman, Washington, U.S.A
    Dipendra Rai
    MSc Student (Completed: August 2008. Supervisor: R. Gokaraju, Co-supervisor: S.O. Faried)
    Dean's Scholarship
    NSERC Discovery Grant.

    Dipendra Rai's M.Sc. thesis was on Damping of Sub-synchronous Resonance using Static Synchronous Series Compensator.

    Dipendra is currently working as a Systems Planning Engineer, BC Hydro, Vancouver, Canada.
    Sumit Paudyal
    MSc Student (July 2008)
    Department Devolved Scholarship
    NSERC Discovery Grant.

    Sumit's MSc thesis was on Development of an Energy Equilibrium Criterion Directly in the Time-Domain to Detect Out-of-Step Condition in Power Systems.

    Sumit completed his PhD degree from the Department of Electrical & Computer Engineering, University of Waterloo, Waterloo, Canada in August 2012.
    http://www.eng.uwaterloo.ca/~spaudyal/

    He is currently an Assistant Professor in the Department of Electrical & Computer Engineering, Michigan Technological University, Houghton, U.S.A.
    http://www.mtu.edu/ece/department/faculty/
    Terrence Munroe
    PGD Student (Completed: April, 2008)

    Terrence's project was on Out-of-Step Transmission Protection using Two-Blinder Scheme Technique.

    He is currently working as an engineer in the Transmission Asset Management Division, ATCO Electric, Edmonton, Canada.
    Jaimit Jani
    MEng Student (Completed: December, 2007. Supervisor: R. Gokaraju, Co-supervisor: Prof. M.S. Sachdev)

    Jaimit's project was on Distributed Generation (DG) Interconnection System Impact Study.

    Jaimit is currently working as a Network Development Engineer for Saskatchewan Power Corporation, Regina, Canada.
    Eli Pajuelo
    MSc Student (Completed: August, 2006. Supervisor: R. Gokaraju, Co-supervisor: Prof. M.S. Sachdev)
    Department Devolved Scholarship.
    NSERC Discovery Grant.

    Eli's MSc project was on Phasor Estimation Technique to Minimize the Impact of CCVT Transients in Distance Protection.

    Eli is currently employed with ATCO Electric, Edmonton, Canada and doing PhD studies under my supervision on a part-time basis.

    Teaching

    EE868
    Digital Techniques for Power System Protection & Control
    (Graduate Course)
    EE442
    Power Systems Operation & Control
    (4th Year Undergraduate)
    EE444
    Electric Machines II
    (4th Year Undergraduate)
    EE341
    Electric Machines I
    (3rd Year Undergraduate)
    EE392
    Electric Engineering Laboratory III
    (3rd Year Undergraduate)
    EE495
    Senior Design Project
    (4th Year Undergraduate)

    Research Projects

    [Recent Research Projects]

    Dr. Rama Gokaraju’s research is in Power Systems Protection, Control and Operation. His research focuses on developing advanced computational methods for power system protection, control and transient stability and to implement these techniques in the wide area power system context. The primary equipment protection and control issues for transmission lines, generators etc is well understood, however, the wide area system protection, control and transient stability research for Smart Grids, which he is pursuing is in its infancy stages. The issues in this area are more complicated to deal with, require detailed transient models, and involve large system studies.

    Dr. Gokaraju and his graduate students have recently developed a new approach using the trajectories analysis of the electrical measurements for out-of-step protection in large power systems. With the proposed representations, it would be possible to obtain both critical clearing angle and critical clearing time information simultaneously, and this will be a real benefit for relaying purposes. Using the proposed technique, it will be possible predict that the power system will lose synchronism quickly at delta angle between 90-120 degrees instead of waiting until the verge of unstable operation (ie “relative phase angles reaching 180 degrees”).

    Dr. Gokaraju and his graduate students have also recently developed adaptive control schemes that will address the practical problem of globalized tuning of several Flexible Alternating Current Transmission System (FACTS) controllers, which control the various pieces of power system network equipment. Without such tuning, it is possible that the different controllers in the network may adversely interfere with each other. With this approach, the performance of today's complex power systems could significantly be improved using an automated control parameter tuning process.

    Parts of the adaptive control programs Dr. Gokaraju worked on during his Ph.D. research are being used by ABB Turgie, Switzerland in their digital excitation control systems and are in commercial use since 1999. He is currently developing this technique for FACTS devices.

    Dr. Gokaraju and his graduate students are also researching on dynamic models for the excitation limiters so as to make full use of the generator capability. Dynamic models currently do not exist for the coordination of protection and control functions and as a result the generator capability is unduly restricted.

    [Real-Time Power Systems Simulation Laboratory]
    [JPEG]

    Dr. Gokaraju’s Real-Time Power Systems Simulation Laboratory is used for computer simulation studies and experimental testing using a real-time simulator. The simulator is used for doing detailed transient studies on large power system configurations. All students develop prototypes of their relay and control algorithms on DSP and FPGA boards and test them using hardware-in-the-loop simulations with the real-time power system simulator. Samples of results from HIL testing -- [GIF], [JPEG]

    The major equipment in the laboratory are: (1) The Real-Time Digital Simulator -- RTDS, (2) Six High Performance Computers, (3) Two Synchronous Machines for Experimental Testing, (4) Analog Devices and Texas Instrument DSP Development Boards, (5) FPGA Boards, (6) GE D60 Distance Relay for GE firmware testing.

    The Real-Time Digital Simulator (RTDS) in the laboratory consists of Two PB5 Processing Cards, Two Giga Processing Card (GPC), Giga-Transceiver Network Communication Card (GTNET) (supports C37.118 data output streams, IEC 61850 GSE binary messaging, IEC 61850-9-2 SVs, GTNET-PMUs, GTNET-PLAYBACK), Analog and Digital Input/Output Cards.

    [Research Funding]

    Dr. Gokaraju’s recent research activities are funded from the Canadian Foundation for Innovation Leaders Opportunity Fund, NSERC Discovery Grant (2010-2015), NSERC ENGAGE Grants (Littelfuse Startco, Hitachi), NSERC Industrial Postgraduate Scholarship Support, Commonwealth Graduate Scholarship Exchange Program.