EDUCATION
2016-2021 National Institute of Technology Karnataka (NITK), Surathkal, India
Doctoral Degree (PhD in Power Electronics and Control) [CGPA: 8.72]
2012-2014 Rajeev Gandhi Memorial College of Engineering and Technology, Nandyal, Andhra Pradesh, India M.Tech (Power Electronics) [Percentage: 83.2%]
2007-2011 Kuppam Engineering College, Kuppam, Andhra Pradesh, India B.Tech. (Electrical and Electronics Engineering) [Percentage: 73.8%]
2005-2007 State Board of Intermediate Education, Andhra Pradesh, India 10+2 (Maths-Physics-Chemistry) [Percentage: 84.2%]
2000-2005 Board of Secondary Education, Andhra Pradesh, India
SSC [Percentage: 68.9%]
Career Highlights and Awards
Received best presenter award for the research article presented in IEEE DISCOVER conference at MIT, Manipal
from 11-12, 2019.
Received the registration fee waiver for the conference article presented at IEEE APPEEC2017.
Three times Graduate Aptitude Test in Engineering (GATE) qualified in 2012, 2013, and 2014 respectively with best all India rank of 4457.
Received MHRD scholarship during M. Tech (2012) and PhD (2016)
Received Institute Gold Medal from Mr N. Chandrababu Naidu as a department topper in KEC at UG Level.
OTHER Activities
Succeed in web designing and admin of website named EEENOTES2U for motivating electrical students towards GATE, Software, and Govt. Sector Exams with the help of E-Notes and PPT’s. (CLICK HERE TO VIEW)
Admin of website SCIENCE SIMULATIONS WORLD, as a goal as made online labs for Physics, chemistry, mathematics, and brain-teasing games with HTML and JAVA codes.
Maintaining one blogger SPOTTURNS, four websites EEENOTES2U, SCIENCE SIMULATIONS WORLD, ELECTRICALPROJECTS4U, YOUNG INDIA to provide technical awareness to peoples, and approved by Google AdSense.
Organizer and Admin of NGO named YESTNP (Youth Educational Society of Thellaneellapalli) to help the poor children in nearby villages, and it is successfully going on Towards Growth. (CLICK HERE TO VIEW)
TECHNICAL EXPERTISE
5+ years of experience working with Control Systems Applications in Power Electronics Group in National Institute of Technology, Karnataka.
6+ years of Strong knowledge and experience on MATLAB/Simulink, PLECS, PSIM, PSCAD, Orcad, and Lab view tools.
Experience in modelling and designing the design of high power converters (DC-DC and DC-AC) using the appropriate PCB circuit, hardware troubleshooting, switch rating selection, a driver design, snubber selection, sensor circuit and filter design for Grid-connected PV applications.
Experience in small-signal modelling, power losses and reliability estimation, and worst component failure predictions for the designed power converters.
Knowledge in battery modelling, SOH estimation, SOC and cell balancing techniques.
Expertise in digital control implementation using FPGA (VHDL and Verilog codes) and other controllers STM32, Myrio.
Simulation software: MATLAB/Simulink, PLECS, PSIM, PSCAD, Orcad, SaberRD (basics), LabView, Quanser.
Programming Languages: C, Embedded C, Verilog, and VHDL.
Expertise in coding platforms: Matlab, Quartus-II, Xilinx ISE, and Keil µVision3.
Hardware Platforms: Altera Cyclone-IV FPGA, MyRio, STM32 microcontroller, Basys2 Board, and Aurdino.
Hardware equipment handled: Solar Array Simulator, Programmable DC source, Programmable AC/DC Load, 4-channel isolated/non-isolated DSOs, LCR meter, Frequency Response Analyzer, and Cube servo-2.
EXPERIENCE
April 2015 to July 2016 Sri Venkateshwara College of Engineering, Bengaluru.
Designation: Assistant Professor (only Under Graduates ) (Click here to see)
Subjects Handled: Power electronics, network analysis, industrial drives and applications, power system analysis, and stability.
Laboratories Handled: Power electronics lab, microcontroller lab, analogue electronics lab, measurements, and instrumentation Lab.
Other roles:
R&D coordinator from EEE Dept., Handling one Project in Solar Inverter in SVCE Rooftop.
My research article ‘Unexplained ancient achievements-anti gravity: an ideology desirable to stent hen the modern
technology’’ is selected and appeared in college magazine AURORA-2K16.
Website designer and promoter of National Conference NCRDPE-15, FDP RIETPE-16.
Develop discipline plans and work closely with at-risk students.
Identify and organize field trips to enhance the curriculum.
RESEARCH EXPERIENCE
1. Publications: International Journals: 3, International Conferences: 2, National Conferences: 4
International Journals:
Reddivari, R., & Jena, D . A Correlative Investigation of Impedance Source Networks: A Comprehensive Review. IETE Technical Review, 1-34. (IETE Technical Review.: SCIE Indexed )
Reddivari, R., Jena, D., & Goutham T.N. (2020). Analysis, Design, and Performance Evaluation of Differential Mode Y-Source Converters for Voltage Spikes Mitigation. IEEE Transactions on Industrial Applications, 56(6), 6701-6710. (IEEE Trans.: SCI Indexed )
Reddivari, R., & Jena, D. (2020). Analysis of RCD Snubber Based Non-Ideal Z-source Inverter Using Average Modelling Approaches. International Journal of Electronics, 107(5), pp. 755-777. (Taylor & Francis: SCI Indexed )
Reddivari, R., & Jena, D. (2019). A Negative Embedded Differential Mode Γ-Source Inverter with Reduced Switching Spikes. IEEE Transactions on Circuits and Systems II: Express Briefs, 67(10), pp.2009-2013. (IEEE Trans.: SCI Indexed )
Reddivari, R., & Jena, D. (2019). Novel active clamped Y-source network for improved voltage boosting. IET Power Electronics, 12(8), 2005-2014. (IET: SCIE Indexed )
Kumar, K. V., Reddivari, R., & Jena, D. (2019). A Comparative Study of Different Capacitor Voltage Control Design Strategies for Z-Source Inverter. IETE Journal of Research, 1-11. (Taylor & Francis: SCIE Indexed )
Reddivari, R., & Jena, D. (2018). A critical analysis of Z-source converters considering the effects of internal resistances. International Journal of Electronics, 105(10), 1785-1803. (Taylor & Francis: SCI Indexed )
Goutham T.N., Reddivari, R., Jena, D. (2021). A Cost-Effective Single-Phase Semi Flipped Gamma Type Magnetically Coupled Impedance Source Inverters. International Journal of Circuit Theory and Applications, 47(4), pp. 1078-1102. (Wiley: SCI Indexed )
Reddivari, R. P., & Nandyal, K. S. (2014). Comparative analysis of magnetically coupled Z-source inverters. International Journal of Engineering Research, 3(7), 2278-0181. (CLICK HERE VIEW)
C., Reddy, L. Sagar, & Reddivari, R.P. (2015). A Simulation overview of magnetically coupled Z-source inverters. International Journal of Advanced Research in Electrical and Electronics and Instrumentation Engineering (IJAREEIE), 4(8), 7286-7296.
International Conferences:
Sitara, K., Josh, P., Reddivari, R., &Jena, D. (2020). Component Level Reliability Evaluation of Boost Converter, Z-Source, and Improved Gamma Type Y-Source Inverters. In 2020 IEEE PES POWERCON, Bangalore. (pp. 1-6). IEEE
Goutham, T. N., Reddivari, R., &Jena, D. (2019, October). Design Implementation of High Boost Embedded Semi Quasi-ZSI for Photovoltaic System Applications. In 2019 IEEE Global Conference for Advancement in Technology (GCAT) (pp. 1-6). IEEE.
Gowrishankar, K., Jena, D., & Reddivari, R. (2019, August). Comparative Overview of Proportional-Integral, State Feedback Integral, and Sliding Mode Controllers for Buck Converter. In 2019 IEEE International Conference on Distributed Computing, VLSI, Electrical Circuits and Robotics (DISCOVER) (pp. 1-6). IEEE.
Reddivari, R., Jena, D., & Goutham, T. N. (2018, December). Differential Mode Y-Source DC-DC Converter for Better Performance with Loosely Coupled Inductors. In 2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES) (pp. 1-6). IEEE.
Reddivari, R., & Jena, D. (2018, January). A detailed model of Z-source converter considering parasitic parameters. In 2018 International Conference on Power, Instrumentation, Control and Computing (PICC) (pp. 1-6). IEEE.
Reddivari, R., & Jena, D. (2018, January). Practical limitations of embedded Z-source DC-DC converters in PV applications. In 2018 International Conference on Power, Instrumentation, Control and Computing (PICC) (pp. 1-6). IEEE.
Reddivari, R., & Jena, D. (2017, November). Differential mode gamma source inverter with reduced switching stresses. In 2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) (pp. 1-6). IEEE.
Reddivari, R., Pruthviraj, B. G., Bharat, M., & GB, A. K. (2016, January). Modified gamma source inverter for fuel cell-battery hybrid electric vehicles. In 2016 Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy (PESTSE) (pp. 1-6). IEEE.
National Conferences:
“Ground Leakage current reduction methodology in transformer-less grid connected converters for solar power plants”, is presented in National Conference on Recent Developments in Power Engineering (NCRDPE-15), SVCE, Bengaluru, proc.pg:112-120.
“Power Quality Improvements in Induction Generator Based Wind Power Systems”, is presented in National Conference on Recent Developments in Power Engineering (NCRDPE-15), SVCE, Bengaluru, proc.pg:57-63.
“A Control Technique for Grid Connected Renewable Energy System for Power Quality Improvement with Battery Storage System”, is presented in National Conference on Recent Developments in Power Engineering (NCRDPE-15), SVCE, Bengaluru, proc.pg:219-228.
“DC to DC converters with multi phasing techniques”, is presented in National Conference on Recent Developments in Power Engineering (NCRDPE-15), SVCE, Bengaluru, proc.pg:203-206.
2. Patents: 01 (Indian Patent)
3. Affiliations to Professional Organizations:
IEEE Student Member from the year of 2017- current.
IEEE Industry Applications Society Member from the year of 2019- current.
IEEE Power Electronics Society Member from the year of 2019- current.
IEEE Power & Energy Society Member in the year 2018.
Member of International Association of Engineers (IAENG) in Industrial, Electrical Engineering Societies from the year of 2014- current.
WORKSHOPS& SEMINARS
1. Technical Talks Delivered:
Demonstrated Lab session using MATLAB on Sliding mode control and its applications to wind turbine in short term GAIN course on Design and analysis of offshore floating wind turbine held during 3-7 September 2019 at NITK, Surathkal. Click here
Delivered a lecture on Department Level Hands-on Workshop on MATLAB/Simulink for Engineering Applications organized by EEE Department, SVCE Bangalore, during 11-13 February 2016. Click here
Delivered a lecture in a one-day online workshop on Applications of Mathematics in Engineering and Sciences organized by H&S Department, AITS Anantapur, during 23rd May 2020.
2. Faculty Development Programs:
Participated in Five days Faculty Development Programme on Advances in HVAC, HVDC & FACTS Controllers organized by Department of EEE, MSRIT, Bengaluru from 13th to 17th July 2015.
Participated in Five days Faculty Development Programme on Recent Issues and Emerging Trends in Power Engineering organized by the Department of EEE, SVCE, Bengaluru from 21st and 22nd January 2016.
3. Workshops/Technical Talks Attended:
Participated in one week short-term course on Power Electronic Converters and Drives: Fundamentals, Implementation and Applications organized by EEE Department, SVNIT Surath from 03-07, October-2020.
Participated in Five days short-term course on Real-time simulation of electrical systems organized by EEE Department, NITK from 14-18, November-2018.
Participated in TEQIP-III Sponsored 5-Days workshop on Recent Trends in Power Systems Operation and Control organized by EEE Department, NITK, during 11-15 June 2018.
Participated in Sun grow Solar Technical Training for Mission Clean Power for All organized by EEE, NITK, Surathkal.
Participated in two days’ workshop on Mi-Power Software for Simulation of Electrical Systems conducted by Kuppam Engineering College during 12&13 Aug 2013.
Participated in “National level symposium” in Project-Expo and Poster Design events on 20th March 2010 in KEC, Kuppam.
4. Volunteered Experience:
Volunteered in the IEEE 1st International Conference on Power Electronics Applications and Technology in Present Energy Scenario (PETPES 2019), held at Dept. of E&EE, NITK during 29-31, August-2019.
Volunteered in the National Conference in Recent Developments in Power Engineering (NCRDPE-15) organized by Dept. of E&EE, SVCE, Bengaluru on August 5th
ACADEMIC PROJECTS
PhD- “Investigation and Control of Magnetically Coupled Impedance Source Inverters for PV Applications”.
Simulation software: MATLAB/Simulink, PLECS, PSIM, PSCAD, Orcad, PowerFactory-DigSilent, SaberRD, LabView, Quanser.
Programming Languages: C, Embedded C, Verilog, and VHDL.
Expertise in coding platforms: Matlab, Quartus-II, Xilinx ISE, and Keil µVision3.
Hardware Platforms: Altera Cyclone-IV FPGA, MyRio, STM32 microcontroller, Basys2 Board, and Aurdino.
Hardware equipment handled: Solar Array Simulator, Programmable DC source, Programmable AC/DC Load, 4-channel isolated/non-isolated DSOs, LCR meter, Frequency Response Analyzer, and Cube servo-2.
Supervisor – Prof. Debashisha Jena, NITK Surathkal.
Problem Statement: An MPP voltage range, wake-up voltage, and operating voltage range of the grid-connected inverter are the main parameters that decide the superiority of converter performance in PV applications. The two-stage grid-connected PV inverters are limited to narrow range MPP voltage, which requires higher starting or wake-up voltages to start the inverters. The micro-inverter with a narrow MPP voltage range converges to local peak power, though the MPPT algorithm is capable of tracking global maxima. In the shading conditions, the micro-inverter may fail to maintain the required DC-bus voltage (wake-up voltage), and the inverter decides to shut down and stop working. A shutdown inverter must now undergo a start-up process during cloud clearing, at which it must monitor both grid voltage and frequency before going online. In the afternoon time, solar irradiation is very high compared to early mornings and late evenings. However, the inverters stop functioning due to momentary partial shadings made by cloud cover, and it will take 3-5 minutes to bring it online. Also, in the late evening and early mornings, the inverter could not extract the power from PV due to their insufficient or lower PV module voltages than the wake-up voltage.
Solution: Various single-stage magnetically impedance source inverters are proposed as an alternative to conventional two-stage inverter systems. The proposed inverter re-utilises the energy stored in leakage inductance to enhance voltage gain. In addition, the continuous input current, low capacitor, and switching stresses with the lowest possible components are significant advantages.
Small-signal Studies: Analysed the transient response of the proposed converter with detailed modelling using state-space average modelling, circuit averaging, and canonical circuit modelling approaches. It gives information about the critical limitations of converter stability and steady-state error in the voltage gain, capacitor voltage expressions.
Loss Estimations: The losses are being estimated for the developed prototypes to show the efficiency claims. The losses are further validated using PLECS tools.
Reliability Studies: To prove the reliability of the developed prototypes, a component-level design for the reliability algorithm has been developed. The critical components have been identified using the proposed algorithm and been validated using PLECS tools.
Project Contributions and Outcomes:
Topology Contributions: Active Clamped YSI, Differential Mode Gamma Source Inverter and its Negative Embedded Inverter, and Family of differential mode Y-source Inverters
Control Contributions: Closed-loop PI and IP control.
Coupled Inductor Design: Verified the performance of various cores like ferrite, high-flux, cool Mu, MPP with different winding orientations to reduce leakage inductance and stray capacitance of winding.
Outcomes: ONE Indian Patent, 17 Publications.
M.Tech- “Closed-loop control of Hybrid Gamma source inverter fed induction motor” –MATLAB7.
Description: The increase in petroleum and diesel product prices in the country seeks alternative energies that drive a vehicle. As part of it, this project proposes a hybrid magnetically coupled Z-source inverter with voltage boosting and inverting ability for electrical vehicular application. This project also ensures motor maximum efficiency condition (constant losses=variable losses), Fuel cell, battery SOC (state of charge) MPPT condition conditions by controlling load current.
B.Tech- “Low-cost wireless sensor network for in-field operation of induction motor using ZIGBEE” –MATLAB7, EMBEDDED C, 8051 MC, Kiel Microvision software.
Description: The single-phase motors are simple in construction, cheap in cost, reliable and easy to repair and maintain. Due to all these advantages, the single-phase motor finds its application in vacuum cleaners, fans, washing machines, centrifugal pumps, blowers, washing machines, etc. This project designed a low-cost model of a single-phase ac-ac converter with a reduced switch count. The remote monitoring and control of these motors are essential in modern days as part of home automation. This project develops two control panels (one at the motor end in a remote field, and another one at the end-user side that is connected to a PC) to control the speed of the induction motor and monitor the same. The 8051 microcontrollers are used as a controller, and to sense the speed and to feed the PWM pulses, Zigbee cards of two numbers are used to convey bi-directional control signals.
OTHER PROJECT HANDLED
Project #1: Comparative analysis of magnetically coupled Z-source inverters
Environment: Windows XP, Windows 7
Technology: Matlab/Simulink (7.9b)
Role: Team leader
Duration: From Aug 2011 - Oct 2011
Brief description of the project: This project is mainly designed for high-efficiency boost inverters with reduced stresses which lead to the reduction of cost and size of overall converters. Here this work deals invention of different converters topologies called magnetically coupled Z-source inverters and verification of results with the help of MATLAB modelling.
Project #2: Application of negative DC bus embedded type Z-source inverters in hybrid electrical vehicles Environment: Windows XP, Windows 7.
Technology: Matlab/Simulink (7.9b)
Simulation Package: User-defined functions (S-function, S-function builder, Level 2 -file S-function, Embedded mat lab function), Sim power, Matlab GUI
Role: Team Leader
Duration: Nov 2011-Jan 2012
Brief description of the project: The electric drive systems used in electric vehicles require higher performance, reliability, variable speed due to their ease of controllability and high efficiency and regenerates energy at the time of breaking. In recent days all hybrid vehicles are showing interest in induction motors due to excellent controlling by the SVPWM method and being rugged in construction. The speed control of a 3-phase induction motor is very crucial in hybrid vehicular applications because inputs sources battery about 12-15 volts &fuel cell about 20-50 volts that to DC. But, the output motor requires 3-phase ac 415 volts. Here project needs a powerful converter that converts dc-ac and also boosts. So, this project designs a negative embedded type Z-source inverter in the place of vehicular applications in the MATLAB platform and designs PWM for controls induction motor.
Project #3: Modified configuration of Gamma (Γ)-Source inverter for Fuel Cell Hybrid-electric Vehicle Environment: Windows XP, Windows 7.
Technology: Matlab (2012a/7.12a)
Simulation Package: User-defined functions (S-function, S-function builder, Level 2 -file S-function, Embedded Matlab function), Matlab GUI
Role: Team Leader
Duration: Feb 2012-July 2012
Brief description of the project: This project aims at the cost reduction scheme in hybrid vehicles by introducing spilt power mode of operation. And the Z-source inverter was redesigned in such a way that the battery requirement to the hybrid vehicles was low. The complete work is carried out by the Simulink platform. Hybrid vehicle runs by taking power from fuel cells and also batteries. Split power operation decides the input source for induction motor load.
Project #4: Ground Leakage current reduction techniques for PV cell- Grid-connected systems (real-time)
Environment: Windows XP, Windows 7.
Technology:Matlab (2012a/7.12a), D-Space.
Simulation Package: User-defined functions (S-function, S-function builder, Level 2 -file S-function, Embedded Matlab function), Matlab GUI
Role: coordinator
Duration: Sept 2015-June 2016
Brief description of the project: This project aims at the cost reduction scheme in PV cell- Grid connection converters. The designing of converters for 40KW PV-cell to 3-phase Grid integration. This project majorly working on real-time problems facing grid integration, right solutions in form of the right inverters with suitable gate pulses.
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