Qualification: 
Ph.D, M.E
s_kirthika@blr.amrita.edu

Dr. V. S. Kirthika Devi currently serves as an Assistant Professor in Department of Electrical and Electronics Engineering, Amrita School of Engineering, Bengaluru

Dr. V. S. Kirthika Devi studied B.E. (Electrical and Electronics Engineering) in Kongu Engineering College, Tamilnadu, M.E. (Applied Electronics) in K.S.R Institution of Technology under Anna university, Tamil Nadu, India and Ph.D in Visveswaraya Technological University, Thesis title – Design and Development of Cascaded Multilevel Inverter Strategy for Renewable Energy Integration in Smart Grid. She has been working in the teaching field for about 16 years. Currently, she is working as Assistant Professor in the Department of Electrical & Electronics Engineering, Amrita School of Engineering, Bengaluru. She has published 9 technical research papers in international conferences and 11 technical research papers in international Journals. She is a life member of Indian Society for Technical Education [ISTE].

Educational Qualification

Year Degree University
2020 Ph.D Visvesvaraya Technological University
2004 M.E - Applied Electronics K.S.R Institute of technology, Anna University.
2001 B.E - EEE Kongu Engineering College, Perundurai, Bharathiyar University

Publications

Publication Type: Journal Article

Year of Publication Title

2020

P. Jyothi, Saketh, P., Vignesh, C., and V. S. Kirthika Devi, “Renewable energy powered DC charging system for electric vehicle”, Journal of Physics: Conference Series, vol. 1706, 1 vol., 2020.[Abstract]


Recently, Electric Vehicles (EV) have pulled in a great deal of consideration attributable to the utilization of clean energy. However, the challenge is that developing number of EVs implies request in charging is tremendous which will aggregate the power grid load. In this paper, a renewable based DC charging system is introduced which integrates power from sun, wind and battery energy storage system (BESS) to provide an uninterruptible power supply for the load. Variable irradiance and wind speeds are considered for this study. Incremental conductance method with boost converter and hill climb method with buck converter are implemented in solar and wind respectively to maximize the system efficiency. Three phase uncontrolled diode bridge rectifier is used to convert the AC power output of wind to DC power. Surplus amount of power generated is preserved in the battery storage system which is retrieved in the absence of renewable sources. A bidirectional converter is designed to allow the forward and reverse flow of power. A controller is designed using PID to limit the discharge current of the storage system. Modelling and validation of proposed system is done using MATLAB Simulink platform.

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2020

V. S. Kirthika Devi and Srivani, S. G., “Performance analysis of modified incremental conductance algorithm for photovoltaic system”, Journal of Green Engineering, vol. 10, 5 vol., pp. 2304–2322, 2020.[Abstract]


In this paper the Incremental conductance is mainly concentrated in order to track the peak power at great accuracy. This algorithm works under steady state condition and better adjustable condition along with the promptly uncertain atmosphere. This paper accord with the modified variable step incremental conductance, which can accustom on its own to track peak power value. This improved algorithm is compared with existing model and along with conventional algorithm. Hence it is proved that the improved algorithm gives fast steady state response and better efficiency when compared with the traditional algorithms. This has been verified and compared using simulation with MATLAB/SIMULINK.

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2020

V. S. Kirthika Devi and Srivani, S. G., “A prototype model of an efficient transformerless inverter with dq controller for grid connected photovoltaic system”, Journal of Green Engineering, vol. 10, 6 vol., pp. 2627–2643, 2020.[Abstract]


The proposed paper gives an extensive performance of a dq controller using single phase photovoltaic grid system. In three phase synchronous frame controller benefits are well established. But for single phase system dq transformation is a confront task. Hence this controller exists in remodelling an orthogonal pair by an actual input current and a fictional current. This controller can maintain the steady state error to zero current control of respective DC quantities. The control has been carried out using a dual-stage transformer less inverter using photovoltaic sources as the input source for grid system. This current controller assures, active current is injected to grid and thus results in maximum efficiency of about 98.69% and current harmonics to 3% in simulation validation using MATLAB/SIMULINK. The analysis for various irradiance, various temperature is also discussed and same is compared with single H Bridge inverter system. The experimental analysis using TMS320F28335 board is also validated for the proposed system without filter circuit to show the inverter and grid voltage are well synchronized.

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2019

V. S. Kirthika Devi and .G.Srivani, S., “A DQ Synchronous Reference Frame Current Control for Grid Connected Photovoltaic Systems using Single Phase Cascaded H Bridge Multilevel Inverter”, International Journal of Engineering and Advanced Technology (IJEAT), vol. 9, 2 vol., pp. 2249 –8958, 2019.[Abstract]


This paper projects a high performance decoupled current control using a dq synchronous reference frame for single-phase inverter. For the three-phase inverter the conversion from AC to DC with Proportional Integral controller grants to obtain steady state error for AC Voltages and currents but has a few challenges with the single-phase systems. Hence, an orthogonal pair (β) is created by shifting the phase by one quarter cycle with respect to the real component (α) which is needed for the transformation from stationary to rotating frame. The synchronous reference frame control theory helps in controlling the AC voltage by using DC signal as the reference with the proportional integrator controllers. The implementation of the control is done with two-stage converter with LCL filter for a single-phase photovoltaic system. A modified MPPT Incremental conductance algorithm along with decoupled current control helps in regulating the active and reactive power infused into the grid where the power factor is improved, the efficiency of the system is increased above 95% and total harmonic distortion for current is also reduced to3%. The results have been validated using MATLAB.

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2018

V. S. Kirthika Devi and .G.Srivani, S., “Synchronous reference frame DQ current control for single phase grid connected cascaded H bridge multilevel inverter’’ ”, International Journal of Engineering & Technology (UAE), vol. 7, 4 vol., pp. 4730-4736, 2018.[Abstract]


The main focus on this paper deals with a current control technique for the inverter using a PV system for grid connected topology. The work of this paper is to evolve the PV model by tracking maximum power point using Incremental conductance algorithm by applying synchronous reference frame control method for single phase transformer less cascaded H Bridge Multilevel Inverter via boost converter system connected to 230V grid. A Phase shifted pulse width modulation technique is also projected in order to afford the pulse for voltage source inverter. The mathematical expressions for the control design for the single phase system is expressed in this paper. The analysis of the control is adopted using PI control method and is executed in synchronous rotating d-q reference frame in order to carry out the response of the best output voltage for the grid connected single phase PV system. The d-q technique is applicable only for the three phase system due to the minimum requirement of two independent phases. Hence one quadrature phase inverter is added additionally in the control method. The simulation is done using MATLAB/SIMULINK.

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2018

R. O.C, V. S. Kirthika Devi, and .G.Srivani, S., “Performance Analysis of Single Phase Closed Loop System for Cascaded H-Bridge Multilevel Inverter Using Renewable Source”, Journal of Engineering and Applied Sciences , vol. 13, 7 vol., pp. 1757-1766, 2018.[Abstract]


This study presents a closed loop "Synchronous Reference Frame" (SRF) control method using seven level cascaded H-bridge multilevel inverter for a single phase grid connected photovoltaic system. The proposed control scheme is obtained in order to inject quality current to the grid connected system. This method can generate the sinusoidal current which reduces the total harmonic distortion. The control strategy allows independent control of each DC-link voltage. In addition, it tracks the maximum power point of PV strings. The simulation results for seven level CHB-MLI for 555 W/230 V/50 Hz is presented to validate the proposed control scheme. Simulation is done using MATLAB Simulink platform.

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2017

V. S. Kirthika Devi, Sabareesh, S., and reddy, R. R. Bharath, “Performance Analysis of An Interleaved Fly-back (DC-DC) Converter using Incremental conductance algorithm for PV Source”, Journal of Advanced Research in Dynamical and Control Systems, vol. 11, pp. 246-257, 2017.[Abstract]


This paper aims to describe about isolated inverter connected with an interleaved fly-back converting topology working in DCM mode where the input is given as PV source. Though Now-a-days the inverter used for photovoltaic purposes is simple and has an advantage of low-cost, it is available as micro inverter at a much lower power rating. Hence the main intention of this study is designing the fly-back converter at higher power applications other than as micro inverter. To analyse this a PV system rated at 2KW with MPPT technique is connected to a three interleaving fly-back cells and an inverter given to a load(R). MATLAB Software is used to develop the simulation model of the proposed system. After designing the Simulink model, verification and optimisation is done for better simulation results. A voltage of 315V (Vpeak) and Total Harmonic distortions of 2.98% is achieved. There upon, on the basis of experimental results the converter and its system design perform successfully and competes with already existing system specifications

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2015

V. S. Kirthika Devi and Iyengar, D. S. G. S., “Modeling of a High Performance Photovoltaic system using MPPT Algorithm for seven level Asymmetric H-Bridge Inverter”, ,International Journal of Applied Engineering Research(IJAER), vol. 10, 2015.

2015

T. Susan and V. S. Kirthika Devi, “LLC Resonant inverter based Induction Heating Application using Asymmetrical voltage cancellation technique”, International Journal on Advanced Electrical and Computer Engineering (IJAECE), vol. 2, no. 1, 2015.

2015

V. S. Kirthika Devi and Iyengar, S. G. Srivani, “A new PWM technique for symmetric and asymmetric seven level multilevel inverter topology with reduced number of DC sources”, International Journal of Applied Engineering Research, vol. 10, pp. 22299-22311, 2015.[Abstract]


The Multilevel inverters are the predominating one among the emerging trends in the field of power electronics. This can be applied in many applications especially on the power quality. The topology that has been proposed in this paper presents a seven level H-Bridge inverter with a new PWM control strategies for both symmetric and asymmetric and their comparison is shown. The proposed inverter topology has two sets of units. One is cascaded H bridge section which has three sub multilevel inverters which are connected serially with H bridge multilevel inverter section. It produces the desired stepped output waveform from three DC sources. This paper mainly focuses on the Total harmonic distortion, efficiency improvement of the multilevel inverter and quality of output voltage waveform. This topology has been implemented with only seven switches to obtain seven level. Fundamental switching scheme and New PWM technique is implemented to reduce the total harmonic distortion (THD). The proposed topology is suitable for N number of levels. The proposed performance of the PWM strategy in terms of output voltage and THD is shown using MATLAP/Simulink © Research India Publications.

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2014

D. Madathil, K. Ilango, Dr. Manjula G. Nair, and V. S. Kirthika Devi, “Voltage Flicker Mitigation in Electric Arc Furnace using D-STATCOM”, International Journal of Power Electronics and Drive Systems (IJPEDS), vol. 5, pp. 211–218, 2014.[Abstract]


The major power quality issue of voltage flicker has resulted as a serious concern for the customers and heavy power companies. Voltage flicker is an impression of unsteadiness of visual sensation induced by a light source whose luminance fluctuates with time. This phenomenon is experienced when an Electric Arc Furnace (EAF) as load is connected to the power system. Flexible AC transmission devices (FACTS) devices were gradually utilized for voltage flicker reduction. In this paper the FACTS device of Distribution Static Synchronous Compensator (D-STATCOM) is used to serve the purpose of mitigating voltage flickering caused by electric arc furnace load, which is efficiently controlled by Icosɸ control algorithm. The model of electric arc furnace is considered as a current source controlled by a non linear resistance, which had been simulated and performance was analyzed using MATLAB/SIMULINK Software.

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Publication Type: Conference Paper

Year of Publication Title

2020

M. Nagasai Parripati and V. S. Kirthika Devi, “A Single Phase DC-AC Inverter For Aircraft Application”, in 2020 Fourth International Conference on Inventive Systems and Control (ICISC), Coimbatore, India, 2020.[Abstract]


The eminent goal of this paper is to evolve an inverter for an aircraft application. In Aircraft, most of the avionic systems use 115 V AC with a 400Hz power supply. A standard 28 V DC bus is available as an input source. The DCAC inverter converts 28 V DC to 115 V AC with 400Hz to provide power supply to AC loads. In proposed work, the conversion technique uses a boost converter which boosts the voltage from a lower range to a higher value of DC and H-bridge is used to transform high voltage DC to desired AC. The simulation with MATLAB/Simulink model is analyzed along with the hardware prototype model.

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2018

P. Ajay Kumar, V. S. Kirthika Devi, and Kakani, S. Kumar, “Reliability Improvement of Uninterrupted Power Supplies”, in 2018 4th International Conference for Convergence in Technology (I2CT), Mangalore, India, 2018.[Abstract]


In this paper a Low frequency inverter, its operation and testing's are discussed. The low frequency inverter is designed for Uninterrupted Power Supply (UPS) application. This inverter is tested for improving the reliability to be well used in UPS application. The types of testing's and two case studies on improving the stability and reliability are discussed. Also the various protections included in UPS application for an inverter are discussed.

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2018

S. Datta Patri, Goutham, P., Rao, M. S., and V. S. Kirthika Devi, “Hybrid Battery Charging System Using Utility Grid”, in 2018 3rd IEEE International Conference on Recent Trends in Electronics, Information Communication Technology (RTEICT), Bangalore, India, 2018.[Abstract]


In this paper design of hybrid battery charging system and the implementation of the system has been described. Charging the battery using the solar and utility grid has been explained in this paper. A microcontroller has been programmed to control the relay. An algorithm is programmed in such a way that it detects the voltage at the terminals of battery and allows the relay to operate. As the microcontroller senses the battery voltage it sends the suitable commands to relay that control the utility grid supply. Depending on the availability of the utility grid supply UPS (Uninterrupted Power Supply) connects or disconnects through which the battery gets charged. The system has been designed in such a way that perfectly suits Indian scenario where there is sporadic power supply. The proposed system is implemented for a double battery system.

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2018

P. B. Kaushik, I. Reddy, T., S, S., and V. S. Kirthika Devi, “Wireless power transmission incorporating solar energy as source for motoring applications”, in 2018 International Conference on Emerging Trends and Innovations In Engineering And Technological Research, ICETIETR 2018, 2018.[Abstract]


Wired technology is the conventional way of connecting elements in a circuit, but it required further sophistication and innovation. In recent times, Wireless Power Transmission has begun to emerge as a solution to deliver energy to devices at remote distances and places not easily accessible by wires and cables. This method involves the transferring of electrical energy wirelessly from a transmitter to a receiver, placed at some distance from each other. The idea used here, is to send energy over some range, using a renewable energy source, such as solar energy, without using wire connections. PV panels are used in this case, as they play a pivotal role by being the source of renewable energy, unlike the other contemporary nonrenewable energy sources. The PV panels convert sunlight into electrical energy by Photovoltaic Effect. The voltage obtained is then given to the transmitter, which transmits energy in the form of EM waves, with the help of one coil at the transmission end and another at the receiving end. The receiver decodes the transmitted wave to its original form, generating the same voltage as observed at the transmitting end. This whole set-up is arranged in a panel which can be kept on rooftops and terraces, giving transmission and reception range over a wide span of area, which may include a living room or a work-space. © 2018 IEEE.

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2017

V. S. Kirthika Devi and Srivani, S. G., “Modified phase shifted PWM for cascaded H bridge multilevel inverter”, in 2017 Third International Conference on Advances in Electrical, Electronics, Information, Communication and Bio-Informatics (AEEICB), Chennai, India, 2017, pp. 89-94.[Abstract]


This paper proposes a modified phase shift pulse width modulation technique which is suitable for both single phase and three phase system for a conventional cascaded H bridge multilevel inverter. The carrier phase shift PWM method which is proposed in this paper improves the output voltage waveform and reduces the total harmonic distortion when compared with the conventional phase shift PWM method. The modified pwm is analyzed using a seven level cascaded H bridge multilevel inverter for both single phase as well as for three phase system, and this pwm can also be applied to N number of levels for cascaded H bridge inverter depending upon their angle calculations. The comparative analysis of this proposed pwm is done with respect to conventional pwm and the results are shown in terms of the harmonic spectrum analysis. This is done using the MATLAB/SIMULINK.

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2016

V. S. Kirthika Devi and Srivani, S. Gb, “Performance assessment of PV energy conversion system with Buck-Boost and Cuk converter for cascaded H-Bridge inverter”, in 2016 - Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy, PESTSE 2016, 2016.[Abstract]


The main aim of the paper describes the analysis, modeling and design of a direct control method using incremental Conductance algorithm along with the constant voltage tracking method for a PV system. In this paper the comparative analysis is also done between Cuk and Buck-Boost converter. The PV integration is done with the multistring cascaded multilevel H-Bridge inverter along with hybrid PWM control at the inverter side for a 3KW output power. The main goal of this paper is to integrate PV system with inverter to a grid with better efficiency and lesser total harmonic distortion (THD) by mainly considering the improvement towards the power quality. The simulation results for this proposed work is achieved using MATLAB.

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2015

V. S. Kirthika Devi, Patrao, R. Henron, Sreekanth, P. S., Ramole, G., and Sreekumar, A., “Implementation of Staircase Modulation on a Five Level Cascaded H-Bridge Multilevel Inverter and Interfacing with Photovoltaic Modules”, in Power and Advanced Control Engineering (ICPACE), 2015 International Conference on, 2015.[Abstract]


In this paper, design and implementation of staircase modulation technique on an existing topology of single phase five level Cascaded H-Bridge multilevel inverter using reduced number of switches is done. The existing Cascaded H-Bridge multilevel inverter has two sources and five switches thus reducing the total harmonic distortion and electromagnetic interference. The two sources being DC are replaced by Photovoltaic

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2014

R. Prem, Manmadhan, S., and V. S. Kirthika Devi, “Wireless control of DC-DC converter”, in 2014 Power and Energy Systems Conference: Towards Sustainable Energy, PESTSE 2014, Bangalore, 2014.[Abstract]


This paper aims at the analysis and design of a new DC-DC multi output boost (MOB) converter using which the output can be shared between different loads. Several single output power supplies can be replaced by this configuration. The duty ratio of the three pulses is varied accordingly to the key pressed in the keypad. The pulses are wirelessly transmitted and its range is found to be depended on antenna height. This paper deals with the family of single inductor multi output DC-DC converter. The drawback of conventional transformer based multi output DC-DC converters such as high cost and large volume is avoided using a single inductor boost type dual output DC-DC converter using wireless control. © 2014 IEEE.

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Publication Type: Conference Proceedings

Year of Publication Title

2015

V. S. Kirthika Devi and Srivani, S. G., “A Novel PWM Technique For Seven Level Multilevel H-Bridge Inverter Topology”, 6th International Conference On Electrical Electronics Communication Robotics And Instrumentation Engineering (Iceecie 2015). 2015.

Ph.D Students

  • Ms. Thalanki Venkata Sai Kalyani (Part time)
    Department of EEE
    Area of research: Health Monitoring of Protective Devices in Power Systems.
    Registered on July 2020
  • Renukaprasad G. (Part time)
    Department of EEE
    Area of research: Artificial Intelligent Controller based Multilevel Inverter for Renewable Energy Integration.
    Registered on July 2020
  • K. Shalini (Part time)
    Department of EEE
    Area of research: Fault Tolerant Based Multilevel Inverter Topology for Motor Drive Application. 
    Registered on January 2021
  • G. Esha (Part-time)
    Department of EEE
    Area of research: Battery Management System (BMS) for Hybrid Electric Vehicle.
    Registered on Jan 2021