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Dr. Swakshar Ray, Senior Member, IEEE
Director and Business Partner, ARMAX Automation Pvt
Ltd, Bangalore, India, Phone: +919790888446
Email: swakshar@armaxindia.com
Dr. Swakshar Ray is a Director and business partner in ARMAX Automation Pvt
Ltd, Bangalore. He has his own company as RAY Renewable Consultancy and
Research OPC Pvt Ltd.
Dr Ray was a Renewable energy Consultant providing solution to the power community on
Solar, wind and battery energy resources and their modelling on PSSE, PSCAD, EMTP-RV,
PSLF. He is also providing support to the clients on Hardware In Loop ((HIL) testing of inverter
and power plant controllers in both RTDS and OPAL-RT.
Dr. Ray served as Director at Enerzinx,LLC. He is responsible for renewable energy projects
and their grid integration .
Dr. Ray has over 12 years of wide ranging experience in the field of power system engineering.
He has served in various positions in United States, Sweden and India. His experience range
from cutting edge research in the area of HVDC and FACTS. Dr. Ray is actively working with
many PV inverter and Power Plant Controller (PPC) manufacturers like TMEIC, INACCESS,
SUNGROW, TESLA, PE etc. He is also actively working in modelling PV inverter and PPC in
PSSE, PSCAD and PSLF.
During his tenure at ABB, Dr. Ray has been instrumental in research of HVDC controls. He filed
3 patents during his tenure in ABB, Chennai. He primarily worked in Multi-module converter-
based technology for HVDC.
During his tenure at GE Global Research, Niskyuana, USA, Dr. Ray has led design
and development of wide area control and protection for power system. His efforts
led to development of new algorithms, which led to granting 4 patents in his name.
Prior to joining GE, Dr. Ray served as a Research Scientist for ABB Corporate Research, Sweden
where he focused on wide area control of FACTS devices. He has 4 granted patent during his
tenure in ABB Corporate Research, Sweden.
Prior to joining ABB, he was with Quanta Technology, Raleigh, USA. He was an advisor
working in the field of power system consulting for utilities like AEP, SCE etc. He was
instrumental in doing feasibility study of 765 KV transmission planning for AEP.
Dr. Ray completed his PhD from University of Missouri-Rolla, USA in the year 2007. He
finished his M.S. from Oklahoma State University, USA in the year 2003. He completed his
B.E. from Jadavpur University, India in the year 2000.
Dr. Ray has served as reviewer to many IEEE and IET conference and journals.

PROFESSIONAL SERVICES
Dynamic Model Development
During his employment at ENERZINX, Dr. Ray led numerous projects developing
mathematical models for various power system equipment such as solar inverters, synchronous
machines, power plant controllers (PPC). He designed and developed equipment models using
industry standard and commercially licensed software tools such as PSCAD and Siemen’s
PSSE® software. He has a many year of experience in Fortran and C coding. Dr. Ray worked
closely with equipment manufacturers and generation owners to accurately model the dynamic
behavior of their power system equipment and analyze its impact on grid stability and system
security.
Grid Stability and Interconnection Analysis
Dr. Ray has led a few grid integration studies, analyzing the impact of new
generation/transmission addition to the grid. His studies were primarily focused on system
stability. He worked closely with transmission service providers quantifying the impact of new
generation and transmission addition to the grid. He has done studies for WECC, ERCOT,
MISO, NYISO and NEISO territories in USA. He is an expert in PSSE steady-state and Dynamic
simulations, PSCAD, PSLF, EMTP-RV, MATLAB, SIMULINK and POWER WORLD.
Power System Research
Dr. Ray has 6 years of experience in power system advanced research in the area of Flexible
AC Transmission System, HVDC. He has done numerous projects in developing wide area
controller for FACTS and HVDC systems. His research also includes working in Multi-Module
Converter technology for HVDC.
POWER SYSTEM MODELING SOFTWARE EXPERIENCE
Over the course of his career in the power industry, Dr. Ray had become expert on various
software and numerical computation tool to model various aspects of system behavior. Below is
a list of numerical computation tools for reference.
• PSCAD
• Fortran and C
• Siemen’s PSSE® for steady state, contingency analysis, thermal and voltage stability.
• Siemen’s PSSE® for dynamics and transient stability
• MatLab

• Power World
• EMTP-RV
Projects:
1. Wide area control design for PSS while in GE Global Research USA
2. Wide area controller design and HIL testing using RTDS and PMU while in
ABB Corporate Research, Sweden
3. 765 KV overlay feasibility study for American Electric Power in Power World while
in Quanta Technology
4. Wind integration modelling for Southern California Edison in PSCAD and RTDS while
in Quanta Technology
5. Multi-Terminal DC grid design with bipolar multi-module converter for ABB
Corporate Research, Sweden
6. Multi-module converter design and control for HVDC in ABB Global Industries
and Services Pvt Ltd, Chennai, India
7. Steel Mill project for Solar integration of 30 capacity in PSSE and PSCAD for
New England ISO, USA.
8. Old Mill project for solar integration of 30 MW capacity in PSSE and PSCAD for
NEISO, USA
9. Salt Fork wind integration study in PSCAD for 300 MW wind power plant
10. White-horse wind system integration in PSCAD for 300 MW wind power plant
11. Complete Power Plant Controller model development in PSCAD using Fortran coding
for Inaccess, Greece
12. Cultana Solar Project (300 MW), Austalia with SunGrow inverter and Inaccess PPC in
PSSE and PSCAD both user defined model and generic model.
13. Huewei inverter integration with Inaccess PPC in PSSE and PSCAD
14. Parker Ranch, Hawaii, USA 15 MW solar and battery project integration, steady-
state and dynamic study in PSSE and PSCAD
15. Ulupalakua, Hawaii, USA 30 MW solar and battery project integration, steady-state
and dynamic study in PSSE and PSCAD
16. Done numerous PSSE model integration, steady-state and dynamic study for different
Solar projects in Hawaii, USA
17. TMEIC Solar inverter and Power Plant Controller modelling in PSSE and PSCAD
18. Australian Grid Code requirement validation for SunGrow and TMEIC inverters in
PSSE and PSCAD
19. Contingency analysis of WECC region in Western USA having more than 10000 buses
at over 132 KV voltage level
20. Inverter controller tuning for TMEIC inverters in American Electric Power for
ERCOT, USA
21. Inverter controller tuning for low SCR condition in MISO, USA
ETC.

Resume of Swakshar Ray
Swakshar Ray, PhD, SMIEEE, Electrical Engineering
swakshar@armaxindia.com Phone: 91-9790888446
WORK EXPERIENCE
Industry Experience:
Director and Business Partner, ARMAX Automation Pvt Ltd and CTO, RAY Renewable
Consultancy and Research Pvt Ltd, Kolkata, India
I have started working as a Director and Business Partner for renewable energy consultancy and Power Plant
Controller development for Solar and Wind Power Plants after my resignation from Enerzinx on 27th
, May, 2019. I
provide support for modelling renewable energy resources like solar, wind and battery energy storage in PSSE,
PSCAD, PSLF and EMTP-RV. I also provide support for Hardware in Loop testing of inverters and power plant
controllers for solar and wind industry. I provide Concept to Commissioning support for Solar farms at best prices
compared to other consultants.
Enerzinx India Pvt Ltd March. 2018 to 27th
, May, 2019
Working as a Technical Director Solar and Wind consulting business in India. I am working in the field of renewable
integration along with provider of inverters and PV and Wind systems. We are also looking to develop our own solar
farm in the future. I work with PSSE, PSCAD, MATLAB, PSLF etc for simulations. I am managing a group of 9
engineers at the moment. I have contributed to more than USD 4,00,000 in technical work. Mostly I am indulged in
the PV and ESS controller modelling and Power plant controller modelling for PV and ESS. I have completed more
than 50 jobs in last one year. I have also trained junior people in technical matters of the business in PSSE,
PSCAD, EMTP-RV.
ABB Global Industries and Services Pvt Ltd January, 2016 to 2018
Work•ed WasoarkSedcieinntCisotminptehteitoGrraidnaSlysitsemproRje&cDt.foWroHrkViDngCincoHnVveDrCterantodpFolAoCgiTeSs system studies.
• Project leader of AC network harmonic impedance modeling for HVDC
• Work Package leader of Harmonic current injection project for HB MMC
• 3 IP filing and 6 Invention disclosures.
• One patent filing on circulating current control
• One patent filing on use of particle swarm optimization for 2
nd
and 4
th
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.
• Worked extensively on MMC voltage source converter.
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, drives etc
• Operation and control of LV and MV drives
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
• 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
US Visa Status: 3 years of H1B visa period still pending.
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 255Linear 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
Performance validation Validate the performance of the designed controllers using frequency domain
analysis and time domain simulations
System emulation and Use of real-time simulator platform like RTDS to emulate the behavior of a large
controller implementation power system in real-time and implement and test control algorithms using TI DSP
and ABB MACH2
Computational Neural network and Evolutionary computation (e.g. PSO) based pattern
Intelligence based design recognition and control system design
Project planning and From proposal writing to execution of research projects
execution
ACADEMIC BACKGROUND
Year Degree Institution Subject GPA / Marks (%)
2004 - 07 Doctor of Philosophy University of Missouri Rolla Intelligent Control 3.8/4.0
(PhD) (now known as Missouri of Power System
University of Science and
Technology), Rolla, USA
2002 - 03 Master of Technology Oklahoma State University, Power Systems 4.0/4.0
(project) Stillwater, USA and Control
1996 - 00 Bachelor of Electrical Jadavpur University, Electrical 77.73%
Engineering (BEE) Calcutta, India engineering
1
st
class with honors
1995 Higher secondary Adarsha Uchcha Vidyalaya, Science 73.7%
(10+2) Agarpara, India
1993 Secondary (10) Adarsha Uchcha Vidyalaya, Basic school 79.77%
Agarpara, Calcutta, India level subjects
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 2
nd
best student poster award in the IEEE PES meeting in ampa, 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
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
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
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
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
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
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
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

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.
doi: 10.1049/iet-gtd.2009.0624
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
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
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
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
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
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
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
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
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

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
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
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
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
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
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
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
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
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.
doi: 10.1109/IJCNN.2003.1223785
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

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
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
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
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
IP Filing:
4 IP have been granted while in ABB and 4 IP have been granted while in GE Global Research. Two IP have been
filed while in ABB GISPL, Chennai. 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
Abstract: A method, device and computer program product for providing improved control of power or voltage
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

Inventors: Bertil Berggren, Rajat Majumder, Swakshar Ray, Balarko Chaudhuri, Nilanjan Ray Chaudhuri
Power system stabilization
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
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
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
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
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 Dr. R. Ramakumar, Professor, Life Donald Morrow, Vice President
Associate Professor, Electrical Fellow of IEEE Quanta Technology
and Computer Engineering, Regents Profesor Raleigh, NC, 27607, USA
Missouri University of Science and PSO/Albrecht Naeter Professor Email: dmorrow@quanta-
Technology, Rolla, MO, 65401 Director of Engineering Energy Lab. technology.com
Email: ganeshv@mst.edu Email: ramakum@okstate.edu Phone: +1 919-334-3023
Phone: +1 573 341 6641 Phone: (405) 744-5157
Dr. Martin Hagan Dr. Balarko Chaudhuri, Lecturer
Professor Electrical and Electronics
Oklahoma State University Engineering, Imperial College ,
Email: mhagan@okstate.edu
London, UK, Email:Phone: (405) 744-7340
b.chaudhuri@imperial.ac.uk
Phone: +44(20)75946196

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