Qualification: 
Ph.D, M.Tech, BE
s_shankar@blr.amrita.edu

Dr. Shankar S. currently serves as Assistant Professor in the Department of Electrical and Electronics Engineering, Amrita School of Engineering, Bengaluru Campus. He has more than 3 years experience in teaching and industry. He has five international conference publications to his credit. He did his Master’s thesis in GE Global Research entitled ‘Design and Development of Electromagnet Workbench’. He successfully defended his Ph. D. in "Investigation on some aspects of brushless generation of power using matrix converter from variable speed wind energy sources" from Indian Institute of Technology (IIT), Delhi. He worked as an intern in GE Global Research for 6 months. He is a member of Institute of Electrical and Electronics Engineers (IEEE), IEEE Power and Energy Society (PES).

Qualification

YEAR DEGREE UNIVERSITY
2015 Ph.D. (Power Electronics) IIT Delhi.
2008 M. Tech. (Power Electronics) R. V. College of Engineering, Bangalore (VTU)
2005 B. E. (Instrumentation Technology) K. N. S. Institute of Technology, Bangalore (VTU)

Publications

Publication Type: Conference Paper

Year of Publication Publication Type Title

2017

Conference Paper

K. Sivakumar, Dr. J. Ramprabhakar, and Dr. Shankar S., “Coordination of wind-hydro energy conversion system with sliding mode control”, in 1st IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems, ICPEICES 2016, 2017.[Abstract]


This paper proposes a sliding mode control strategy for achieving the reliable operation of wind-hydro energy conversion system in isolated mode. With this control strategy it is viable to generate electrical power in localities with favorable meteorological condition and limited grid connectivity. In this work, a self-excited induction generator is used which is driven by the variable wind speed turbine and another self-excited induction generator which is driven by hydro turbine assuming constant water flow. The simulation results are displayed to show the effectiveness of the control strategy to maintain voltage at the point of common coupling and also its frequency constant. © 2016 IEEE.

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2016

Conference Paper

M. T. Athulya and Dr. Shankar S., “SVPWM Based Control of Matrix Converter for Gearless Operation of Wind Energy Power Conversion System”, in Power and Energy Systems: Towards Sustainable Energy (PESTSE), 2016 Biennial International Conference on, 2016.[Abstract]


In this paper space vector modulated control of Matrix Converter (MC) topology is used with Squirrel Cage Induction Generator (SCIG) for wind power generation systems. The SCIG stator frequency is appropriately tuned to attain active power flow into the grid. In the proposed topology, a gearless wind energy conversion system is used. The MC acts as an interface between the grid and SCIG. Space Vector Pulse Width Modulation (SVPWM) strategy is employed for the control of the MC switches.

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2016

Conference Paper

M. R. Anaghakrishnan, Dr. Shankar S., and Lekshmi S, “A novel AC-AC converter using bridgeless flyback rectifier and flyback CCM inverter”, in 2016 Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy (PESTSE), 2016.[Abstract]


The performance analysis of an AC-AC converter which is the combination of flyback rectifier with a bridgeless configuration and flyback inverter in a continuous conduction mode is discussed here. Compared to the basic bridge diode topology, the flyback rectifier with a bridgeless configuration can solve the problems related to conduction losses appearing in the primary side and improves the efficiency with a few circuit elements in place of bridge diodes. The flyback inverter which is operated in a continuous conduction mode (CCM) has lower peak currents and higher efficiencies. A comparative study of this modified circuit with the normal circuit arrangement having ac-dc converter and dc-ac inverter is presented. The simulation of the proposed model is implemented in MATLAB platform.

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2014

Conference Paper

V. Rajasekhar, Chatterjee, J. K., Dr. Shankar S., and Kondalarao, A., “Comparative Analysis of Simple Modulation Technique and SVM of Matrix Converter”, in Electrical Energy Systems (ICEES), 2014 IEEE 2nd International Conference on, 2014.[Abstract]


In this paper a simple modulation strategy is briefly described and compared with the traditional popular space vector modulation (SVM) for the operation of 3-phase matrix converter. Both the techniques have been implemented in MATLAB/Simulink environment and input grid side current harmonics with the variation of modulation index, output frequency has been observed.

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2011

Conference Paper

J. K. Chatterjee, Dr. Shankar S., Bharat, D., and Das, S., “Performance Improvement in selective Harmonic Compensation of Shunt Hybrid Active Filter”, in Power and Energy Systems (ICPS), 2011 International Conference on, 2011.[Abstract]


Present work aims to improve the dynamic response and reliability of Shunt Hybrid Active Filter (SHAF) configuration using improved methods of harmonic detection. A method of introduction of only “positive inductance” through an active filter for mistuned conditions of the passive filter has been presented.“PLL free” scheme of harmonic detection for an uncontrolled rectifier type of non linear load has been studied. Intense simulation studies are carried out using MATLAB/Simulink to validate the functioning of the developed More »»

2011

Conference Paper

Dr. Shankar S., Chatterjee, J. K., Rajasekhar, V., and Kondalarao, A., “Reduction of grid current harmonic injection in matrix converter controlled induction generator for wind applications”, in International Conference on Power and Energy Systems (ICPS), 2011 , Chennai, 2011.[Abstract]


A technique has been presented for reducing the injection of harmonic current into the grid for matrix converter controlled induction generator, for application in wind energy conversion systems. A composite arrangement has been proposed where, multiple matrix converter controlled induction generators are kept in parallel and connected to the grid with appropriate phase shifting transformers that help in reducing the grid current harmonics. This technique of harmonic reduction with minimal use of the filter component will have an enormous impact in cases like wind farms having multiple generating units. More »»

2011

Conference Paper

J. K. Chatterjee, Dr. Shankar S., and Meena, V. Kumar, “Reduction of grid current harmonic injection in cosinusoidal modulated matrix converter controlled induction generator for wind applications part-II”, in Annual IEEE India Conference (INDICON), 2011 , Hyderabad, 2011.[Abstract]


In this paper electric power generation from wind is achieved by directly coupling wind turbine to a squirrel cage induction generator without gear box. A matrix converter (MC) is used as an interface between the grid and the generator for direct to grid power injection. For the control of the induction generator voltage and frequency, a cosinusoidal modulation technique for switching of matrix converter devices has been applied. Present work relates to improvement of quality of the grid side current by having a composite structure of multiple matrix converter controlled induction generators in parallel. These aspects enhance the possibility of application of proposed matrix converter control in wind farms having multiple wind turbines. More »»

2011

Conference Paper

Dr. Shankar S., Chatterjee, J. K., and Saxena, M., “Reduction of grid current harmonic injection in cosinusoidal modulated matrix converter controlled induction generator for wind applications part-I”, in Annual IEEE India Conference (INDICON), 2011 , 2011.

2010

Conference Paper

A. K. Rao, Chatterjee, J. K., Dr. Shankar S., and Rajasekhar, V., “Improved operation of a three phase matrix converter using simple modulation strategy”, in 2010 Joint International Conference on Power Electronics, Drives and Energy Systems & 2010 Power India , New Delhi, 2010.[Abstract]


Present work relates to improved operation of a 3-phase matrix converter using simple modulation strategy. A simple approach for input displacement power factor control is described, which can make the matrix converter as a source or sink of controlled reactive power. Novel feature of this investigation is the study relating to parallel operation of two matrix converters, from the point of view of reduction of input current harmonic, using a simple and reliable control strategy for matrix converter operation. These aspects enhance the possibility of application of matrix converters in grid connected wind energy conversion systems (wind farms). More »»

Publication Type: Journal Article

Year of Publication Publication Type Title

2004

Journal Article

S. Rajendran and Dr. Shankar S., “Mesh Distortion Sensitivity of 8-node Plane Elasticity Elements Based on Parametric, Metric, Parametric-metric, and Metric-parametric Formulations”, Structural Engineering and Mechanics, vol. 17, pp. 767–788, 2004.[Abstract]


The classical 8-node isoparametric serendipity element uses parametric shape functions for both test and trial functions. Although this element performs well in general, it yields poor results under severe mesh distortions. The distortion sensitivity is caused by the lack of continuity and/or completeness of shape functions used for test and trial functions. A recent element using parametric and metric shape functions for constructing the test and trial functions exhibits distortion immunity. This paper discusses the choice of parametric or metric shape functions as the basis for test and/or trial functions, satisfaction of continuity and completeness requirements, and their connection to distortion sensitivity. Also, the performances of four types of elements, viz., parametric, metric, parametric-metric, and metric-parametric, are compared for distorted meshes, and their merits and demerits are discussed. More »»
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