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Swakshar Ray, PhD, Electrical Engineering
swakshar.r@in.abb.com , swakshar@gmail.com Phone: 91-9790888446, Chennai, Tamilnadu,
India, 600116
WORK EXPERIENCE
Industry Experience:
ABB Global Industries and Services Pvt Ltd January, 2016 to Present
Working as a Scientist in the Grid System R&D. Working in HVDC and FACTS system studies.
· Worked in Competitor analysis project for HVDC converter topologies
· Project leader of AC network harmonic impedance modeling for HVDC
· Work Package leader of Harmonic current injection project
· 3 IP filing and 6 Invention disclosures.
· One patent filing on circulating current control
· One patent filing on use of particle swarm optimization for 2nd
and 4th
harmonic circulating current injection
to increase over voltage sustainability of MMC HVDC.
· One patent filing on how to optimize the number of cells of a MMC for specifically transformer-less design.
Concast Ltd 2013 – 2015
Worked as Power plant operation and maintenance engineer
· Operation and maintenance of power plant electrical system
· Procurement of motors, generators, transformers etc
· Cable sizing
GE Global Research July, 2010 –2013
Worked as a research scientist in the power system group being involved in the following projects:
· Solar controller design and testing using Real Time Digital System
· Wide area control using PMUs
· Power system protection using wide area based differential protection using PMUs
· 4 granted patents
Quanta technology as Principal Engineer in Transmission Group
Worked in the following projects:
· Wind modeling study for SCE using PSCAD
· Wind integration model development for SCE system using RTDS
· AEP Smart Transmission Study for 765 KV overlay and wind integration using PowerWorld
ABB Corporate Research, Vasteras, Sweden, Sep 2008 – September, 2009
Working as a research scientist in the Power Technology (PT) department under Electric Power System (EPS)
group being involved in the following projects.
· Wide area control for SVC, STATCOM, STATCOM with Energy Storage
· Real-time digital simulation using RTDS
· Control of Dynamic energy storage
· Modeling and control of Multi-terminal HVDC
· 4 granted patents
Quanta Technology (Power Consulting Group under Quanta Services), Raleigh, NC, USA, Jan 2008 – Aug
2008
Worked as a senior consulting engineer in transmission group.
· General Rate Case preparation for Southern California Edison, USA
· Reliability study for EPRI (Electrical Power Research Institute)
· Short circuit study for Southern California Edison, USA
· Contributed in Voltage stability and PMU-based wide area control study by BPA
· Key contribution in bringing a project on voltage stability evaluation from United Illuminating power utility
Larsen and Toubro India Ltd , Bombay, India, Aug. 2000 – Jan. 2002.
Worked as a Commissioning Engineer for AC, DC drives and PLC, SCADA systems and leading projects on
· DC drive commissioning upto 150 kW
Resume of Swakshar Ray Page 2 of 9
· AC drive commissioning for one of the largest coal handling project from 22 kW upto 1.2 MW
· PLC-based automation for DC drive and Oil pipeline SCADA system
· DC drive commissioning and finalization abroad for a steel mill in Bangladesh
RESEARCH EXPERIENCE
PhD thesis on Intelligent Wide Area Control of Generation and FACTS in a Power System at
University of Missouri Science and Technology, Rolla, USA, Aug 2004 – Dec 2007
Emphasis (NSF funded project)
· Wide area monitor and control design using neural network based adaptive and optimal controller. Real
time implementation of multi-layer perceptron, recurrent neural network and simultaneous recurrent neural
network based controllers in DSP. Power system modeling in Real-Time Digital Simulator (RTDS).
Mitigation of the effect of communication delay in wide area control design.
· Wide area control for series and unified FACTS devices such as Gate Controlled Series Capacitor
(GCSC), Thyristor Controlled Series Compensator (TCSC) and Unified Power Flow Controller (UPFC).
System and controller implementation in MATLAB, PSCAD and RTDS.
· Local intelligent control using neural networks for single and multi-module GCSCs and real time
implementation in RTDS.
M. Tech thesis on Multi-machine transient stability study of power system with UPFCs at
Oklahoma State University, Stillwater, USA, Jan 2002-Dec 2003
Other projects
· Conducting OG&E funded research on Optimal Power Flow for Gas and Electric combined system, Spring, 2002-
Fall 2003 at Oklahoma State University, Stillwater, USA
· Optimal power flow algorithm for UPFC, under Advanced Power System Analysis course at Oklahoma State
University, Stillwater, USA Fall 2002
· Voltage profile and loss index for determining DG placement, as research associate under Dr. R. Ramakumar,
Life Fellow at IEEE at Oklahoma State University, USA
· A project on Illumination control of multiple lamps using PIC based PWM, as research assistant under Dr. T. W.
Gedra, at Oklahoma State University, Spring 2004
· Building power system model with generation, transmission and distribution at laboratory level for under-graduate
students at Oklahoma State University, Summer-Fall, 2003
· B.Tech project on Kalman Filter Estimation, at Jadavpur University, 1999-2000
TEACHING ASSISTANTSHIP EXPERIENCE
· ECEN 3113 Energy Convertion (Oklahoma State University, Stillwater, USA) – Fall 2002 – Fall 2003:
Demonstrating experiments on circuit theory, electrical machines and power system
· ECE 255 Linear Systems Laboratory using Matlab (University of Missouri- Rolla, Rolla, USA) – Fall 2005 –
Spring 2007: Teaching the fundamentals of linear system and Matlab implementation
TECHNICAL SKILLS
System modeling Modeling of power electronic converter and interconnected power systems using
Matlab Simulink, EMTDC/PSCAD and RSCAD/RTDS, PSSE, PSLF
System analysis Analysis of system dynamic behavior (stability and performance) through modal
techniques using Matlab
Adaptive control design Use neural network in adaptive control techniques for designing controllers for
generation and transmission control devices for power system using Matlab,,
EMTDC/PSCAD and DSPs
Resume of Swakshar Ray Page 3 of 9
Performance validation Validate the performance of the designed controllers using frequency domain
analysis and time domain simulations
System emulation and
controller implementation
Use of real-time simulator platform like RTDS to emulate the behavior of a large
power system in real-time and implement and test control algorithms using TI
DSP and ABB MACH2
Computational
Intelligence based design
Neural network and Evolutionary computation (e.g. PSO) based pattern
recognition and control system design
Project planning and
execution
From proposal writing to execution of research projects
ACADEMIC BACKGROUND
Year Degree Institution Subject GPA / Marks (%)
2004 - 07 Doctor of Philosophy
(PhD)
University of Missouri Rolla
(now known as Missouri
University of Science and
Technology), Rolla, USA
Intelligent Control
of Power System
3.8/4.0
2002 - 03 Master of Technology
(project)
Oklahoma State University,
Stillwater, USA
Power Systems
and Control
4.0/4.0
1996 - 00 Bachelor of Electrical
Engineering (BEE)
1st
class with honors
Jadavpur University,
Calcutta, India
Electrical
engineering
77.73%
1995 Higher secondary
(10+2)
Adarsha Uchcha Vidyalaya,
Agarpara, India
Science 73.7%
1993 Secondary (10) Adarsha Uchcha Vidyalaya,
Agarpara, Calcutta, India
Basic school
level subjects
79.77%
ACHIEVEMENTS
·State government ranking 117th among 4,00,000 candidates in the secondary examination
·Hughes Scholarship award for best power system student at the Oklahoma State University, USA, 2003
·Phi-Kappa-Phi honorary membership for outstanding result in the M.S. from Oklahoma State University
·Awarded Walter Karplus Summer Research Grant for the year 2005 from IEEE Computational Intelligence
Society.
·Awarded the Best Graduate Student of 2004-2005 in the Department of Electrical and Computer Engineering.
·Primary-author of the poster selected for the 2nd
best student poster award in the IEEE PES meeting in Tampa,
FL, USA, 2007
·Primary-author of the poster selected for the special recognition student poster award in the IEEE ISAP meeting in
Wasington, D.C., USA, 2006
·Selected for Miron Zucker Travel Grants for attending the 2004 and 2006 Industrial Application Society General
Conference at Seattle.
·IEEE Senior Member
Resume of Swakshar Ray Page 4 of 9
PUBLICATIONS
1. J. Arif, N. Ray Chaudhuri, S. Ray and B. Chaudhuri, "Self-tuning feedback linearization controller for power
oscillation damping," Transmission and Distribution Conference and Exposition, 2010 IEEE PES, New
Orleans, LA, USA, 2010, pp. 1-8.
doi: 10.1109/TDC.2010.5484294
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5484294&isnumber=5484192
2. S. Ray and G. K. Venayagamoorthy, "Nonlinear Modified PI Control of Multi-Module GCSCs in a Large
Power System," Industry Applications Conference, 2006. 41st IAS Annual Meeting. Conference Record of
the 2006 IEEE, Tampa, FL, 2006, pp. 1345-1351.
doi: 10.1109/IAS.2006.256705
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4025392&isnumber=4025345
3. H. Iyer, S. Ray and R. Ramakumar, "Assessment of Distributed Generation Based on Voltage Profile
Improvement and Line Loss Reduction," Transmission and Distribution Conference and Exhibition,
2005/2006 IEEE PES, Dallas, TX, 2006, pp. 1171-1176.
doi: 10.1109/TDC.2006.1668671
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1668671&isnumber=34941
4. N. R. Chaudhuri, S. Ray, R. Majumder and B. Chaudhuri, "A case study on challenges for robust wide-area
phasor POD," Power & Energy Society General Meeting, 2009. PES '09. IEEE, Calgary, AB, 2009, pp. 1-6.
doi: 10.1109/PES.2009.5275406
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5275406&isnumber=5260217
5. S. Ray and G. K. Venayagamoorthy, "Wide area signal based optimal neurocontroller for a UPFC," Power
and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century,
2008 IEEE, Pittsburgh, PA, 2008, pp. 1-1.
doi: 10.1109/PES.2008.4596095
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4596095&isnumber=4595968
6. N. R. Chaudhuri et al., "Power oscillation damping control using wide-area signals: A case study on Nordic
equivalent system," Transmission and Distribution Conference and Exposition, 2010 IEEE PES, New
Orleans, LA, USA, 2010, pp. 1-8.
doi: 10.1109/TDC.2010.5484295
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5484295&isnumber=5484192
7. N. R. Chaudhuri, S. Ray, R. Majumder and B. Chaudhuri, "A new approach to continuous latency
compensation with adaptive phasor power oscillation damping controller (POD)," Power and Energy
Society General Meeting, 2010 IEEE, Minneapolis, MN, 2010, pp. 1-1.
doi: 10.1109/PES.2010.5588104
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5588104&isnumber=5588047
8. S. Ray, G. K. Venayagamoorthy, E. H. Watanabe and F. D. de Jesus, "Optimal dynamic neurocontrol of a
gate-controlled series capacitor in a multi-machine power system," Intelligent Systems Application to
Power Systems, 2005. Proceedings of the 13th International Conference on, Arlington, VA, 2005, pp. 7
pp.-.
doi: 10.1109/ISAP.2005.1599267
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1599267&isnumber=33627
9. N. R. Chaudhuri, B. Chaudhuri, S. Ray and R. Majumder, "Wide-area phasor power oscillation damping
controller: A new approach to handling time-varying signal latency," in IET Generation, Transmission &
Distribution, vol. 4, no. 5, pp. 620-630, May 2010.
Resume of Swakshar Ray Page 5 of 9
doi: 10.1049/iet-gtd.2009.0624
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5462533&isnumber=5462527
10. S. Ray, B. Chaudhuri and R. Majumder, "Appropriate signal selection for damping multi-modal oscillations
using low order controllers," Power and Energy Society General Meeting - Conversion and Delivery of
Electrical Energy in the 21st Century, 2008 IEEE, Pittsburgh, PA, 2008, pp. 1-7.
doi: 10.1109/PES.2008.4596564
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4596564&isnumber=4595968
11. S. Ray, G. K. Venayagamoorthy, B. Chaudhuri and R. Majumder, "Comparison of Adaptive Critic-Based
and Classical Wide-Area Controllers for Power Systems," in IEEE Transactions on Systems, Man, and
Cybernetics, Part B (Cybernetics), vol. 38, no. 4, pp. 1002-1007, Aug. 2008.
doi: 10.1109/TSMCB.2008.924141
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4539644&isnumber=4567535
12. H. Iyer, S. Ray and R. Ramakumar, "Voltage profile improvement with distributed generation," Power
Engineering Society General Meeting, 2005. IEEE, 2005, pp. 2977-2984 Vol. 3.
doi: 10.1109/PES.2005.1489406
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1489406&isnumber=32012
13. B. Chaudhuri, S. Ray and R. Majumder, "Robust low-order controller design for multi-modal power
oscillation damping using flexible AC transmission systems devices," in IET Generation, Transmission &
Distribution, vol. 3, no. 5, pp. 448-459, May 2009.
doi: 10.1049/iet-gtd.2008.0471
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4907252&isnumber=4907248
14. G. K. Venayagamoorthy et al., "Effects of a STATCOM, a SCRC and a UPFC on the dynamic behavior of a
45 bus section of the Brazilian power system," Power Engineering Society Inaugural Conference and
Exposition in Africa, 2005 IEEE, Durban, 2005, pp. 305-312.
doi: 10.1109/PESAFR.2005.1611835
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1611835&isnumber=33853
15. S. Ray and G. K. Venayagamoorthy, "Wide-Area Signal-Based OptimalNeurocontroller for a UPFC," in IEEE
Transactions on Power Delivery, vol. 23, no. 3, pp. 1597-1605, July 2008.
doi: 10.1109/TPWRD.2007.916111
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4543031&isnumber=4550606
16. N. R. Chaudhuri, S. Ray, R. Majumder and B. Chaudhuri, "A New Approach to Continuous Latency
Compensation With Adaptive Phasor Power Oscillation Damping Controller (POD)," in IEEE Transactions
on Power Systems, vol. 25, no. 2, pp. 939-946, May 2010.
doi: 10.1109/TPWRS.2009.2031908
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5332251&isnumber=5452108
17. G. K. Venayagamoorthy and S. Ray, "A neural network based optimal wide area control scheme for a
power system," Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record
of the 2005, 2005, pp. 700-706 Vol. 1.
doi: 10.1109/IAS.2005.1518384
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1518384&isnumber=32505
18. T. W. Gedra, Seungwon An, Q. H. Arsalan and S. Ray, "Unified power engineering laboratory for
electromechanical energy conversion, power electronics, and power systems," in IEEE Transactions on
Power Systems, vol. 19, no. 1, pp. 112-119, Feb. 2004.
doi: 10.1109/TPWRS.2003.820997
Resume of Swakshar Ray Page 6 of 9
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1266558&isnumber=28330
19. Y. Pan, W. Ren, S. Ray, R. Walling and M. Reichard, "Impact of inverter interfaced distributed generation
on overcurrent protection in distribution systems," Power Engineering and Automation Conference
(PEAM), 2011 IEEE, Wuhan, 2011, pp. 371-376.
doi: 10.1109/PEAM.2011.6134963
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6134963&isnumber=6134893
20. S. Ray, G. K. Venayagamoorthy and E. H. Watanabe, "A Computational Approach to Optimal Damping
Controller Design for a GCSC," in IEEE Transactions on Power Delivery, vol. 23, no. 3, pp. 1673-1681, July
2008.
doi: 10.1109/TPWRD.2007.908761
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4493402&isnumber=4550606
21. S. Ray, Seungwon An and T. W. Gedra, "Introduction of power electronics to electric machines lab,"
Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on, 2002, pp. II-383-II-
386 vol.2.
doi: 10.1109/MWSCAS.2002.1186878
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1186878&isnumber=26620
22. N. R. Chaudhuri, S. Ray, R. Majumder and B. Chaudhuri, "Interaction between conventional and adaptive
phasor power oscillation damping controllers," Power and Energy Society General Meeting, 2010 IEEE,
Minneapolis, MN, 2010, pp. 1-7.
doi: 10.1109/PES.2010.5589943
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5589943&isnumber=5588047
23. P. Palangpour, P. Mitra, S. Ray and G. K. Venayagamoorthy, "DSP-Based PSO Implementation for Online
Optimization of Power System Stabilizers," Adaptive Hardware and Systems, 2008. AHS '08. NASA/ESA
Conference on, Noordwijk, 2008, pp. 379-384.
doi: 10.1109/AHS.2008.70
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4584297&isnumber=4584239
24. S. Ray, G. K. Venayagamoorthy, B. Chaudhuri and R. Majumder, "MISO damping controller design for a
TCSC using particle swarm," Bulk Power System Dynamics and Control - VII. Revitalizing Operational
Reliability, 2007 iREP Symposium, Charleston, SC, 2007, pp. 1-7.
doi: 10.1109/IREP.2007.4410531
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4410531&isnumber=4410507
25. M. B. Menhaj and Swakshar Ray, "Parameter sensitivities of a neuro-based adaptive controller with
guaranteed stability," Neural Networks, 2003. Proceedings of the International Joint Conference on, 2003,
pp. 1963-1968 vol.3.
doi: 10.1109/IJCNN.2003.1223708
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1223708&isnumber=27485
26. S. Ray and G. K. Venayagamoorthy, "Real-time implementation of a measurement-based adaptive wide-
area control system considering communication delays," in IET Generation, Transmission & Distribution,
vol. 2, no. 1, pp. 62-70, January 2008.
doi: 10.1049/iet-gtd:20070027
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4436106&isnumber=4436098
27. M. B. Menhaj and Swakshar Ray, "Parameter sensitivities of a neuro-based adaptive controller with
guaranteed stability," Neural Networks, 2003. Proceedings of the International Joint Conference on, 2003,
pp. 2382-2387 vol.3.
Resume of Swakshar Ray Page 7 of 9
doi: 10.1109/IJCNN.2003.1223785
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1223785&isnumber=27485
28. M. B. Menhaj and S. Ray, "Neuro-based adaptive controller for longitudinal flight control," Intelligent
Control. 2003 IEEE International Symposium on, Houston, TX, USA, 2003, pp. 158-163.
doi: 10.1109/ISIC.2003.1253931
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1253931&isnumber=28053
29. S. Ray and G. K. Venayagamoorthy, "Real-Time Implementation of an Optimal Transient Neurocontroller
for a GCSC," Neural Networks, 2006. IJCNN '06. International Joint Conference on, Vancouver, BC, 2006,
pp. 2261-2266.
doi: 10.1109/IJCNN.2006.247023
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1716393&isnumber=36115
30. J. Arif, N. Ray Chaudhuri, S. Ray and B. Chaudhuri, "Online Levenberg-Marquardt algorithm for neural
network based estimation and control of power systems," Neural Networks, 2009. IJCNN 2009.
International Joint Conference on, Atlanta, GA, 2009, pp. 199-206.
doi: 10.1109/IJCNN.2009.5179071
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5179071&isnumber=5178557
31. S. Ray, G. K. Venayagamoorthy and E. H. Watanabe, "Computational approach to optimal damping
controller design for a GCSC," Power and Energy Society General Meeting - Conversion and Delivery of
Electrical Energy in the 21st Century, 2008 IEEE, Pittsburgh, PA, 2008, pp. 1-1.
doi: 10.1109/PES.2008.4596094
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4596094&isnumber=4595968
32. Seungwon An, S. Ray and T. W. Gedra, "Unified energy conversion, power systems and power electronics
lab," Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on, 2002, pp. II-581-
II-584 vol.2.
doi: 10.1109/MWSCAS.2002.1186928
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1186928&isnumber=26620
IP Filing:
4 IP have been granted while in ABB and 4 IP have been granted while in GE Global Research. One IP have been
filed while in ABB GISPL, Chennai and one under processing. Details are given below:
Control of a power transmission system
Patent number: 8798800
Abstract: The invention provides improved control of a power transmission system having a first group of
measurement units in a first geographical area providing a first set of phasors and a second group of measurement
units in a second geographical area providing a second set of phasors, where the phasors in the sets are generated
at the same instant in time. In this system the power control device includes a phasor aligning unit that time aligns
the first and second sets of phasors and a control unit that compares each set of phasors with a corresponding
phasor number threshold, determines that a first control condition is fulfilled if each phasor number threshold has
been exceeded and enables the provision of a common signal if the first control condition is fulfilled. The common
signal is based on the obtained phasors in the first and second sets.
Type: Grant
Filed: December 12, 2011
Issued: August 5, 2014
Assignee: ABB Research Ltd.
Inventors: Bertil Berggren, Petr Korba, Rajat Majumder, Swakshar Ray
Power or voltage oscillation damping in a power transmission system
Patent number: 8710700
Abstract: A method, device and computer program product for providing improved control of power or voltage
Resume of Swakshar Ray Page 8 of 9
oscillation damping in a power transmission system. The device includes a magnitude obtaining element configured
to obtain an instantaneous magnitude of a signal representing a deviating oscillation in at least one element of the
power transmission system, a slope investigating element configured to determine the rate of change of the signal,
and a first processing block including an integrating element configured to integrate the instantaneous magnitudes
with an integrating factor that is based on the determined rate of change. The first processing block is further
configured to form a phase compensation angle based on the integrated instantaneous magnitude for use in a
damping control signal generating unit in order to provide power or voltage oscillation damping of the system.
Type: Grant
Filed: February 6, 2012
Issued: April 29, 2014
Assignee: ABB Research Ltd.
Inventors: Bertil Berggren, Rajat Majumder, Swakshar Ray, Balarko Chaudhuri, Nilanjan Ray Chaudhuri
Power system stabilization
Patent number: 9043040
Abstract: A method of damping power system oscillations include obtaining a time synchronized damping control
signal from a remote location and determining a communication time delay in receiving the time synchronized
damping control signal from the remote location. The time synchronized damping control signal is then modified
based on a phase compensation factor and an amplitude compensation factor determined from the time delay.
Finally, a damping signal is generated based on the modified time synchronized damping control signal.
Type: Application
Filed: January 31, 2012
Issued: August 1, 2013
Assignee: GENERAL ELECTRIC COMPANY
Inventors: Swakshar Ray, Mark Gerard Adamiak, Amol Rajaram Kolwalkar
ELECTRIC DISTRIBUTION SYSTEM PROTECTION
Patent Number: 9178350
Abstract: A system for distributing electrical current to a plurality of loads includes a first sensor coupled to an input
of a protection zone for measuring a first current entering the protection zone, wherein the protection zone includes
at least a portion of an electrical distribution feeder. The system also includes a second sensor coupled to an output
of the protection zone for measuring a second current exiting the protection zone, and a processor coupled to the
first sensor and to the second sensor. The processor is programmed to receive measurements representative of the
first current and the second current, and calculate a reactive current differential of the protection zone based on the
first current and the second current. The processor is also programmed to compare the reactive current differential
with a fault threshold, and generate an error notification if the reactive current differential is greater than the fault
threshold.
Type: Application
Filed: November 30, 2011
Issued: May 30, 2013
Inventors: Pan Yan, Reigh Allen Walling, Amol Rajaram Kolwalkar, Michael Lewis Reichard, Wei Ren, Swakshar
Ray
SYSTEM FOR ELECTRIC DISTRIBUTION SYSTEM PROTECTION AND CONTROL AND METHOD OF
ASSEMBLING THE SAME
Patent number: 8908343
Abstract: An electric distribution system includes at least one feeder and a protection and control system. The
feeder includes at least one segment including a first end and an opposing second end. The protection and control
system includes a protective device and an electric current measuring device coupled to the segment proximate
each end. The system further includes at least one processor coupled in communication with the electric current
measuring devices. The at least one processor is programmed to determine a difference between a synchronized
first electric current measured proximate the first end and a synchronized second electric current measured
proximate the opposing second end and determine a switching condition of the protective devices as a function of
the difference between the synchronized first and second electric currents.
Type: Application
Filed: October 31, 2011
Issued: May 2, 2013
Inventors: Yan Pan, Wei Ren, Swakshar Ray, Michael Reichard, Amol Rajaram Kolwalkar, Reigh Allen Walling
POWER SYSTEM STABILIZATION
Patent number: 9006933
Abstract: A method of damping power system oscillations includes obtaining an AC measurement signal from a
power system location and determining oscillation frequency values in the AC measurement signal. A plurality of
single signal components are extracted from the AC measurement signal by subtracting a plurality of processed
Resume of Swakshar Ray Page 9 of 9
measurement signals from the AC measurement signal and a damping signal is generated based on the plurality of
single signal components. Each of the plurality of processed measurement signals are generated by time delaying
the AC measurement signal with a time delay associated with each of the oscillation frequency values other than
the oscillation frequency value of the single signal component to be extracted.
Type: Application
Filed: October 21, 2011
Issued: April 25, 2013
Assignee: GENERAL ELECTRIC COMPANY
Inventors: Swakshar Ray, Amol Rajaram Kolwalkar
Improved control of a power transmission system
Patent Number: WO 2010142340 A1
Assignee: ABB Research Ltd.
Inventors: Bertil Berggren, Petr Korba, Rajat Majumder, Swakshar Ray
Abstract: The invention provides improved control of a power transmission system having a first group of
measurement units (10, 12, 14) in a first geographical area (A_1) providing a first set of phasors and a second
group of measurement units (16, 18) in a second geographical area (A_2) providing a second set of phasors, where
the phasors in the sets are generated at the same instant in time. In this system the power control device (32)
includes a phasor aligning unit (30) that time aligns the first and second sets of phasors and a control unit (33) that
compares each set of phasors with a corresponding phasor number threshold, determines that a first control
condition is fulfilled if each phasor number threshold has been exceeded and enables the provision of a common
signal if the first control condition is fulfilled. The common signal is based on the obtained phasors in the first and
second sets.
REFEREES
Dr. G. K. Venayagamoorthy
Associate Professor, Electrical
and Computer Engineering,
Missouri University of Science and
Technology, Rolla, MO, 65401
Email: ganeshv@mst.edu
Phone: +1 573 341 6641
Dr. R. Ramakumar, Professor, Life
Fellow of IEEE
Regents Profesor
PSO/Albrecht Naeter Professor
Director of Engineering Energy Lab.
Email: ramakum@okstate.edu
Phone: (405) 744-5157
Donald Morrow, Vice President
Quanta Technology
Raleigh, NC, 27607, USA
Email: dmorrow@quanta-
technology.com
Phone: +1 919-334-3023
Dr. Martin Hagan
Professor
Oklahoma State University
Email: mhagan@okstate.edu
Phone: (405) 744-7340
Dr. Balarko Chaudhuri, Lecturer
Electrical and Electronics
Engineering, Imperial College ,
London, UK, Email:
b.chaudhuri@imperial.ac.uk
Phone: +44(20)75946196

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  • 1. Resume of Swakshar Ray Page 1 of 9 Swakshar Ray, PhD, Electrical Engineering swakshar.r@in.abb.com , swakshar@gmail.com Phone: 91-9790888446, Chennai, Tamilnadu, India, 600116 WORK EXPERIENCE Industry Experience: ABB Global Industries and Services Pvt Ltd January, 2016 to Present Working as a Scientist in the Grid System R&D. Working in HVDC and FACTS system studies. · Worked in Competitor analysis project for HVDC converter topologies · Project leader of AC network harmonic impedance modeling for HVDC · Work Package leader of Harmonic current injection project · 3 IP filing and 6 Invention disclosures. · One patent filing on circulating current control · One patent filing on use of particle swarm optimization for 2nd and 4th harmonic circulating current injection to increase over voltage sustainability of MMC HVDC. · One patent filing on how to optimize the number of cells of a MMC for specifically transformer-less design. Concast Ltd 2013 – 2015 Worked as Power plant operation and maintenance engineer · Operation and maintenance of power plant electrical system · Procurement of motors, generators, transformers etc · Cable sizing GE Global Research July, 2010 –2013 Worked as a research scientist in the power system group being involved in the following projects: · Solar controller design and testing using Real Time Digital System · Wide area control using PMUs · Power system protection using wide area based differential protection using PMUs · 4 granted patents Quanta technology as Principal Engineer in Transmission Group Worked in the following projects: · Wind modeling study for SCE using PSCAD · Wind integration model development for SCE system using RTDS · AEP Smart Transmission Study for 765 KV overlay and wind integration using PowerWorld ABB Corporate Research, Vasteras, Sweden, Sep 2008 – September, 2009 Working as a research scientist in the Power Technology (PT) department under Electric Power System (EPS) group being involved in the following projects. · Wide area control for SVC, STATCOM, STATCOM with Energy Storage · Real-time digital simulation using RTDS · Control of Dynamic energy storage · Modeling and control of Multi-terminal HVDC · 4 granted patents Quanta Technology (Power Consulting Group under Quanta Services), Raleigh, NC, USA, Jan 2008 – Aug 2008 Worked as a senior consulting engineer in transmission group. · General Rate Case preparation for Southern California Edison, USA · Reliability study for EPRI (Electrical Power Research Institute) · Short circuit study for Southern California Edison, USA · Contributed in Voltage stability and PMU-based wide area control study by BPA · Key contribution in bringing a project on voltage stability evaluation from United Illuminating power utility Larsen and Toubro India Ltd , Bombay, India, Aug. 2000 – Jan. 2002. Worked as a Commissioning Engineer for AC, DC drives and PLC, SCADA systems and leading projects on · DC drive commissioning upto 150 kW
  • 2. Resume of Swakshar Ray Page 2 of 9 · AC drive commissioning for one of the largest coal handling project from 22 kW upto 1.2 MW · PLC-based automation for DC drive and Oil pipeline SCADA system · DC drive commissioning and finalization abroad for a steel mill in Bangladesh RESEARCH EXPERIENCE PhD thesis on Intelligent Wide Area Control of Generation and FACTS in a Power System at University of Missouri Science and Technology, Rolla, USA, Aug 2004 – Dec 2007 Emphasis (NSF funded project) · Wide area monitor and control design using neural network based adaptive and optimal controller. Real time implementation of multi-layer perceptron, recurrent neural network and simultaneous recurrent neural network based controllers in DSP. Power system modeling in Real-Time Digital Simulator (RTDS). Mitigation of the effect of communication delay in wide area control design. · Wide area control for series and unified FACTS devices such as Gate Controlled Series Capacitor (GCSC), Thyristor Controlled Series Compensator (TCSC) and Unified Power Flow Controller (UPFC). System and controller implementation in MATLAB, PSCAD and RTDS. · Local intelligent control using neural networks for single and multi-module GCSCs and real time implementation in RTDS. M. Tech thesis on Multi-machine transient stability study of power system with UPFCs at Oklahoma State University, Stillwater, USA, Jan 2002-Dec 2003 Other projects · Conducting OG&E funded research on Optimal Power Flow for Gas and Electric combined system, Spring, 2002- Fall 2003 at Oklahoma State University, Stillwater, USA · Optimal power flow algorithm for UPFC, under Advanced Power System Analysis course at Oklahoma State University, Stillwater, USA Fall 2002 · Voltage profile and loss index for determining DG placement, as research associate under Dr. R. Ramakumar, Life Fellow at IEEE at Oklahoma State University, USA · A project on Illumination control of multiple lamps using PIC based PWM, as research assistant under Dr. T. W. Gedra, at Oklahoma State University, Spring 2004 · Building power system model with generation, transmission and distribution at laboratory level for under-graduate students at Oklahoma State University, Summer-Fall, 2003 · B.Tech project on Kalman Filter Estimation, at Jadavpur University, 1999-2000 TEACHING ASSISTANTSHIP EXPERIENCE · ECEN 3113 Energy Convertion (Oklahoma State University, Stillwater, USA) – Fall 2002 – Fall 2003: Demonstrating experiments on circuit theory, electrical machines and power system · ECE 255 Linear Systems Laboratory using Matlab (University of Missouri- Rolla, Rolla, USA) – Fall 2005 – Spring 2007: Teaching the fundamentals of linear system and Matlab implementation TECHNICAL SKILLS System modeling Modeling of power electronic converter and interconnected power systems using Matlab Simulink, EMTDC/PSCAD and RSCAD/RTDS, PSSE, PSLF System analysis Analysis of system dynamic behavior (stability and performance) through modal techniques using Matlab Adaptive control design Use neural network in adaptive control techniques for designing controllers for generation and transmission control devices for power system using Matlab,, EMTDC/PSCAD and DSPs
  • 3. Resume of Swakshar Ray Page 3 of 9 Performance validation Validate the performance of the designed controllers using frequency domain analysis and time domain simulations System emulation and controller implementation Use of real-time simulator platform like RTDS to emulate the behavior of a large power system in real-time and implement and test control algorithms using TI DSP and ABB MACH2 Computational Intelligence based design Neural network and Evolutionary computation (e.g. PSO) based pattern recognition and control system design Project planning and execution From proposal writing to execution of research projects ACADEMIC BACKGROUND Year Degree Institution Subject GPA / Marks (%) 2004 - 07 Doctor of Philosophy (PhD) University of Missouri Rolla (now known as Missouri University of Science and Technology), Rolla, USA Intelligent Control of Power System 3.8/4.0 2002 - 03 Master of Technology (project) Oklahoma State University, Stillwater, USA Power Systems and Control 4.0/4.0 1996 - 00 Bachelor of Electrical Engineering (BEE) 1st class with honors Jadavpur University, Calcutta, India Electrical engineering 77.73% 1995 Higher secondary (10+2) Adarsha Uchcha Vidyalaya, Agarpara, India Science 73.7% 1993 Secondary (10) Adarsha Uchcha Vidyalaya, Agarpara, Calcutta, India Basic school level subjects 79.77% ACHIEVEMENTS ·State government ranking 117th among 4,00,000 candidates in the secondary examination ·Hughes Scholarship award for best power system student at the Oklahoma State University, USA, 2003 ·Phi-Kappa-Phi honorary membership for outstanding result in the M.S. from Oklahoma State University ·Awarded Walter Karplus Summer Research Grant for the year 2005 from IEEE Computational Intelligence Society. ·Awarded the Best Graduate Student of 2004-2005 in the Department of Electrical and Computer Engineering. ·Primary-author of the poster selected for the 2nd best student poster award in the IEEE PES meeting in Tampa, FL, USA, 2007 ·Primary-author of the poster selected for the special recognition student poster award in the IEEE ISAP meeting in Wasington, D.C., USA, 2006 ·Selected for Miron Zucker Travel Grants for attending the 2004 and 2006 Industrial Application Society General Conference at Seattle. ·IEEE Senior Member
  • 4. Resume of Swakshar Ray Page 4 of 9 PUBLICATIONS 1. J. Arif, N. Ray Chaudhuri, S. Ray and B. Chaudhuri, "Self-tuning feedback linearization controller for power oscillation damping," Transmission and Distribution Conference and Exposition, 2010 IEEE PES, New Orleans, LA, USA, 2010, pp. 1-8. doi: 10.1109/TDC.2010.5484294 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5484294&isnumber=5484192 2. S. Ray and G. K. Venayagamoorthy, "Nonlinear Modified PI Control of Multi-Module GCSCs in a Large Power System," Industry Applications Conference, 2006. 41st IAS Annual Meeting. Conference Record of the 2006 IEEE, Tampa, FL, 2006, pp. 1345-1351. doi: 10.1109/IAS.2006.256705 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4025392&isnumber=4025345 3. H. Iyer, S. Ray and R. Ramakumar, "Assessment of Distributed Generation Based on Voltage Profile Improvement and Line Loss Reduction," Transmission and Distribution Conference and Exhibition, 2005/2006 IEEE PES, Dallas, TX, 2006, pp. 1171-1176. doi: 10.1109/TDC.2006.1668671 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1668671&isnumber=34941 4. N. R. Chaudhuri, S. Ray, R. Majumder and B. Chaudhuri, "A case study on challenges for robust wide-area phasor POD," Power & Energy Society General Meeting, 2009. PES '09. IEEE, Calgary, AB, 2009, pp. 1-6. doi: 10.1109/PES.2009.5275406 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5275406&isnumber=5260217 5. S. Ray and G. K. Venayagamoorthy, "Wide area signal based optimal neurocontroller for a UPFC," Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE, Pittsburgh, PA, 2008, pp. 1-1. doi: 10.1109/PES.2008.4596095 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4596095&isnumber=4595968 6. N. R. Chaudhuri et al., "Power oscillation damping control using wide-area signals: A case study on Nordic equivalent system," Transmission and Distribution Conference and Exposition, 2010 IEEE PES, New Orleans, LA, USA, 2010, pp. 1-8. doi: 10.1109/TDC.2010.5484295 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5484295&isnumber=5484192 7. N. R. Chaudhuri, S. Ray, R. Majumder and B. Chaudhuri, "A new approach to continuous latency compensation with adaptive phasor power oscillation damping controller (POD)," Power and Energy Society General Meeting, 2010 IEEE, Minneapolis, MN, 2010, pp. 1-1. doi: 10.1109/PES.2010.5588104 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5588104&isnumber=5588047 8. S. Ray, G. K. Venayagamoorthy, E. H. Watanabe and F. D. de Jesus, "Optimal dynamic neurocontrol of a gate-controlled series capacitor in a multi-machine power system," Intelligent Systems Application to Power Systems, 2005. Proceedings of the 13th International Conference on, Arlington, VA, 2005, pp. 7 pp.-. doi: 10.1109/ISAP.2005.1599267 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1599267&isnumber=33627 9. N. R. Chaudhuri, B. Chaudhuri, S. Ray and R. Majumder, "Wide-area phasor power oscillation damping controller: A new approach to handling time-varying signal latency," in IET Generation, Transmission & Distribution, vol. 4, no. 5, pp. 620-630, May 2010.
  • 5. Resume of Swakshar Ray Page 5 of 9 doi: 10.1049/iet-gtd.2009.0624 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5462533&isnumber=5462527 10. S. Ray, B. Chaudhuri and R. Majumder, "Appropriate signal selection for damping multi-modal oscillations using low order controllers," Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE, Pittsburgh, PA, 2008, pp. 1-7. doi: 10.1109/PES.2008.4596564 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4596564&isnumber=4595968 11. S. Ray, G. K. Venayagamoorthy, B. Chaudhuri and R. Majumder, "Comparison of Adaptive Critic-Based and Classical Wide-Area Controllers for Power Systems," in IEEE Transactions on Systems, Man, and Cybernetics, Part B (Cybernetics), vol. 38, no. 4, pp. 1002-1007, Aug. 2008. doi: 10.1109/TSMCB.2008.924141 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4539644&isnumber=4567535 12. H. Iyer, S. Ray and R. Ramakumar, "Voltage profile improvement with distributed generation," Power Engineering Society General Meeting, 2005. IEEE, 2005, pp. 2977-2984 Vol. 3. doi: 10.1109/PES.2005.1489406 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1489406&isnumber=32012 13. B. Chaudhuri, S. Ray and R. Majumder, "Robust low-order controller design for multi-modal power oscillation damping using flexible AC transmission systems devices," in IET Generation, Transmission & Distribution, vol. 3, no. 5, pp. 448-459, May 2009. doi: 10.1049/iet-gtd.2008.0471 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4907252&isnumber=4907248 14. G. K. Venayagamoorthy et al., "Effects of a STATCOM, a SCRC and a UPFC on the dynamic behavior of a 45 bus section of the Brazilian power system," Power Engineering Society Inaugural Conference and Exposition in Africa, 2005 IEEE, Durban, 2005, pp. 305-312. doi: 10.1109/PESAFR.2005.1611835 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1611835&isnumber=33853 15. S. Ray and G. K. Venayagamoorthy, "Wide-Area Signal-Based OptimalNeurocontroller for a UPFC," in IEEE Transactions on Power Delivery, vol. 23, no. 3, pp. 1597-1605, July 2008. doi: 10.1109/TPWRD.2007.916111 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4543031&isnumber=4550606 16. N. R. Chaudhuri, S. Ray, R. Majumder and B. Chaudhuri, "A New Approach to Continuous Latency Compensation With Adaptive Phasor Power Oscillation Damping Controller (POD)," in IEEE Transactions on Power Systems, vol. 25, no. 2, pp. 939-946, May 2010. doi: 10.1109/TPWRS.2009.2031908 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5332251&isnumber=5452108 17. G. K. Venayagamoorthy and S. Ray, "A neural network based optimal wide area control scheme for a power system," Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005, 2005, pp. 700-706 Vol. 1. doi: 10.1109/IAS.2005.1518384 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1518384&isnumber=32505 18. T. W. Gedra, Seungwon An, Q. H. Arsalan and S. Ray, "Unified power engineering laboratory for electromechanical energy conversion, power electronics, and power systems," in IEEE Transactions on Power Systems, vol. 19, no. 1, pp. 112-119, Feb. 2004. doi: 10.1109/TPWRS.2003.820997
  • 6. Resume of Swakshar Ray Page 6 of 9 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1266558&isnumber=28330 19. Y. Pan, W. Ren, S. Ray, R. Walling and M. Reichard, "Impact of inverter interfaced distributed generation on overcurrent protection in distribution systems," Power Engineering and Automation Conference (PEAM), 2011 IEEE, Wuhan, 2011, pp. 371-376. doi: 10.1109/PEAM.2011.6134963 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6134963&isnumber=6134893 20. S. Ray, G. K. Venayagamoorthy and E. H. Watanabe, "A Computational Approach to Optimal Damping Controller Design for a GCSC," in IEEE Transactions on Power Delivery, vol. 23, no. 3, pp. 1673-1681, July 2008. doi: 10.1109/TPWRD.2007.908761 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4493402&isnumber=4550606 21. S. Ray, Seungwon An and T. W. Gedra, "Introduction of power electronics to electric machines lab," Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on, 2002, pp. II-383-II- 386 vol.2. doi: 10.1109/MWSCAS.2002.1186878 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1186878&isnumber=26620 22. N. R. Chaudhuri, S. Ray, R. Majumder and B. Chaudhuri, "Interaction between conventional and adaptive phasor power oscillation damping controllers," Power and Energy Society General Meeting, 2010 IEEE, Minneapolis, MN, 2010, pp. 1-7. doi: 10.1109/PES.2010.5589943 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5589943&isnumber=5588047 23. P. Palangpour, P. Mitra, S. Ray and G. K. Venayagamoorthy, "DSP-Based PSO Implementation for Online Optimization of Power System Stabilizers," Adaptive Hardware and Systems, 2008. AHS '08. NASA/ESA Conference on, Noordwijk, 2008, pp. 379-384. doi: 10.1109/AHS.2008.70 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4584297&isnumber=4584239 24. S. Ray, G. K. Venayagamoorthy, B. Chaudhuri and R. Majumder, "MISO damping controller design for a TCSC using particle swarm," Bulk Power System Dynamics and Control - VII. Revitalizing Operational Reliability, 2007 iREP Symposium, Charleston, SC, 2007, pp. 1-7. doi: 10.1109/IREP.2007.4410531 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4410531&isnumber=4410507 25. M. B. Menhaj and Swakshar Ray, "Parameter sensitivities of a neuro-based adaptive controller with guaranteed stability," Neural Networks, 2003. Proceedings of the International Joint Conference on, 2003, pp. 1963-1968 vol.3. doi: 10.1109/IJCNN.2003.1223708 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1223708&isnumber=27485 26. S. Ray and G. K. Venayagamoorthy, "Real-time implementation of a measurement-based adaptive wide- area control system considering communication delays," in IET Generation, Transmission & Distribution, vol. 2, no. 1, pp. 62-70, January 2008. doi: 10.1049/iet-gtd:20070027 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4436106&isnumber=4436098 27. M. B. Menhaj and Swakshar Ray, "Parameter sensitivities of a neuro-based adaptive controller with guaranteed stability," Neural Networks, 2003. Proceedings of the International Joint Conference on, 2003, pp. 2382-2387 vol.3.
  • 7. Resume of Swakshar Ray Page 7 of 9 doi: 10.1109/IJCNN.2003.1223785 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1223785&isnumber=27485 28. M. B. Menhaj and S. Ray, "Neuro-based adaptive controller for longitudinal flight control," Intelligent Control. 2003 IEEE International Symposium on, Houston, TX, USA, 2003, pp. 158-163. doi: 10.1109/ISIC.2003.1253931 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1253931&isnumber=28053 29. S. Ray and G. K. Venayagamoorthy, "Real-Time Implementation of an Optimal Transient Neurocontroller for a GCSC," Neural Networks, 2006. IJCNN '06. International Joint Conference on, Vancouver, BC, 2006, pp. 2261-2266. doi: 10.1109/IJCNN.2006.247023 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1716393&isnumber=36115 30. J. Arif, N. Ray Chaudhuri, S. Ray and B. Chaudhuri, "Online Levenberg-Marquardt algorithm for neural network based estimation and control of power systems," Neural Networks, 2009. IJCNN 2009. International Joint Conference on, Atlanta, GA, 2009, pp. 199-206. doi: 10.1109/IJCNN.2009.5179071 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5179071&isnumber=5178557 31. S. Ray, G. K. Venayagamoorthy and E. H. Watanabe, "Computational approach to optimal damping controller design for a GCSC," Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE, Pittsburgh, PA, 2008, pp. 1-1. doi: 10.1109/PES.2008.4596094 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4596094&isnumber=4595968 32. Seungwon An, S. Ray and T. W. Gedra, "Unified energy conversion, power systems and power electronics lab," Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on, 2002, pp. II-581- II-584 vol.2. doi: 10.1109/MWSCAS.2002.1186928 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1186928&isnumber=26620 IP Filing: 4 IP have been granted while in ABB and 4 IP have been granted while in GE Global Research. One IP have been filed while in ABB GISPL, Chennai and one under processing. Details are given below: Control of a power transmission system Patent number: 8798800 Abstract: The invention provides improved control of a power transmission system having a first group of measurement units in a first geographical area providing a first set of phasors and a second group of measurement units in a second geographical area providing a second set of phasors, where the phasors in the sets are generated at the same instant in time. In this system the power control device includes a phasor aligning unit that time aligns the first and second sets of phasors and a control unit that compares each set of phasors with a corresponding phasor number threshold, determines that a first control condition is fulfilled if each phasor number threshold has been exceeded and enables the provision of a common signal if the first control condition is fulfilled. The common signal is based on the obtained phasors in the first and second sets. Type: Grant Filed: December 12, 2011 Issued: August 5, 2014 Assignee: ABB Research Ltd. Inventors: Bertil Berggren, Petr Korba, Rajat Majumder, Swakshar Ray Power or voltage oscillation damping in a power transmission system Patent number: 8710700 Abstract: A method, device and computer program product for providing improved control of power or voltage
  • 8. Resume of Swakshar Ray Page 8 of 9 oscillation damping in a power transmission system. The device includes a magnitude obtaining element configured to obtain an instantaneous magnitude of a signal representing a deviating oscillation in at least one element of the power transmission system, a slope investigating element configured to determine the rate of change of the signal, and a first processing block including an integrating element configured to integrate the instantaneous magnitudes with an integrating factor that is based on the determined rate of change. The first processing block is further configured to form a phase compensation angle based on the integrated instantaneous magnitude for use in a damping control signal generating unit in order to provide power or voltage oscillation damping of the system. Type: Grant Filed: February 6, 2012 Issued: April 29, 2014 Assignee: ABB Research Ltd. Inventors: Bertil Berggren, Rajat Majumder, Swakshar Ray, Balarko Chaudhuri, Nilanjan Ray Chaudhuri Power system stabilization Patent number: 9043040 Abstract: A method of damping power system oscillations include obtaining a time synchronized damping control signal from a remote location and determining a communication time delay in receiving the time synchronized damping control signal from the remote location. The time synchronized damping control signal is then modified based on a phase compensation factor and an amplitude compensation factor determined from the time delay. Finally, a damping signal is generated based on the modified time synchronized damping control signal. Type: Application Filed: January 31, 2012 Issued: August 1, 2013 Assignee: GENERAL ELECTRIC COMPANY Inventors: Swakshar Ray, Mark Gerard Adamiak, Amol Rajaram Kolwalkar ELECTRIC DISTRIBUTION SYSTEM PROTECTION Patent Number: 9178350 Abstract: A system for distributing electrical current to a plurality of loads includes a first sensor coupled to an input of a protection zone for measuring a first current entering the protection zone, wherein the protection zone includes at least a portion of an electrical distribution feeder. The system also includes a second sensor coupled to an output of the protection zone for measuring a second current exiting the protection zone, and a processor coupled to the first sensor and to the second sensor. The processor is programmed to receive measurements representative of the first current and the second current, and calculate a reactive current differential of the protection zone based on the first current and the second current. The processor is also programmed to compare the reactive current differential with a fault threshold, and generate an error notification if the reactive current differential is greater than the fault threshold. Type: Application Filed: November 30, 2011 Issued: May 30, 2013 Inventors: Pan Yan, Reigh Allen Walling, Amol Rajaram Kolwalkar, Michael Lewis Reichard, Wei Ren, Swakshar Ray SYSTEM FOR ELECTRIC DISTRIBUTION SYSTEM PROTECTION AND CONTROL AND METHOD OF ASSEMBLING THE SAME Patent number: 8908343 Abstract: An electric distribution system includes at least one feeder and a protection and control system. The feeder includes at least one segment including a first end and an opposing second end. The protection and control system includes a protective device and an electric current measuring device coupled to the segment proximate each end. The system further includes at least one processor coupled in communication with the electric current measuring devices. The at least one processor is programmed to determine a difference between a synchronized first electric current measured proximate the first end and a synchronized second electric current measured proximate the opposing second end and determine a switching condition of the protective devices as a function of the difference between the synchronized first and second electric currents. Type: Application Filed: October 31, 2011 Issued: May 2, 2013 Inventors: Yan Pan, Wei Ren, Swakshar Ray, Michael Reichard, Amol Rajaram Kolwalkar, Reigh Allen Walling POWER SYSTEM STABILIZATION Patent number: 9006933 Abstract: A method of damping power system oscillations includes obtaining an AC measurement signal from a power system location and determining oscillation frequency values in the AC measurement signal. A plurality of single signal components are extracted from the AC measurement signal by subtracting a plurality of processed
  • 9. Resume of Swakshar Ray Page 9 of 9 measurement signals from the AC measurement signal and a damping signal is generated based on the plurality of single signal components. Each of the plurality of processed measurement signals are generated by time delaying the AC measurement signal with a time delay associated with each of the oscillation frequency values other than the oscillation frequency value of the single signal component to be extracted. Type: Application Filed: October 21, 2011 Issued: April 25, 2013 Assignee: GENERAL ELECTRIC COMPANY Inventors: Swakshar Ray, Amol Rajaram Kolwalkar Improved control of a power transmission system Patent Number: WO 2010142340 A1 Assignee: ABB Research Ltd. Inventors: Bertil Berggren, Petr Korba, Rajat Majumder, Swakshar Ray Abstract: The invention provides improved control of a power transmission system having a first group of measurement units (10, 12, 14) in a first geographical area (A_1) providing a first set of phasors and a second group of measurement units (16, 18) in a second geographical area (A_2) providing a second set of phasors, where the phasors in the sets are generated at the same instant in time. In this system the power control device (32) includes a phasor aligning unit (30) that time aligns the first and second sets of phasors and a control unit (33) that compares each set of phasors with a corresponding phasor number threshold, determines that a first control condition is fulfilled if each phasor number threshold has been exceeded and enables the provision of a common signal if the first control condition is fulfilled. The common signal is based on the obtained phasors in the first and second sets. REFEREES Dr. G. K. Venayagamoorthy Associate Professor, Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO, 65401 Email: ganeshv@mst.edu Phone: +1 573 341 6641 Dr. R. Ramakumar, Professor, Life Fellow of IEEE Regents Profesor PSO/Albrecht Naeter Professor Director of Engineering Energy Lab. Email: ramakum@okstate.edu Phone: (405) 744-5157 Donald Morrow, Vice President Quanta Technology Raleigh, NC, 27607, USA Email: dmorrow@quanta- technology.com Phone: +1 919-334-3023 Dr. Martin Hagan Professor Oklahoma State University Email: mhagan@okstate.edu Phone: (405) 744-7340 Dr. Balarko Chaudhuri, Lecturer Electrical and Electronics Engineering, Imperial College , London, UK, Email: b.chaudhuri@imperial.ac.uk Phone: +44(20)75946196