Rahul Raj Kar

@iith.ac.in

Department of Electrical Engineering
Indian Institute of Technology Hyderabad

Rahul Raj Kar


                     Download Compact PDF  
https://researchid.co/karrahulraj

RESEARCH, TEACHING, or OTHER INTERESTS

Electrical and Electronic Engineering, Toxicology
10

Scopus Publications

43

Scholar Citations

4

Scholar h-index

2

Scholar i10-index

Scopus Publications

  • A Direct Power Synchronization Based Control of Grid-Connected Converter for EV Charging Station With Hybrid Energy Source Under Non-Ideal Grid
    Rahul Raj Kar, Rupesh Wandhare
    IEEE Transactions on Industry Applications, 2026
  • Enhanced Stability and Control of Voltage Source Converters With LCL Filter in Weak Grid
    Rahul Raj Kar, Rupesh Wandhare
    IEEE Journal of Emerging and Selected Topics in Industrial Electronics, 2025
  • Sinusoidal Amplitude Integrator-based Harmonic Extraction for Active Harmonic Filter
    Praveen Vankadari, V.M.V.N. Sai Kishore, Rahul Raj Kar, Rupesh Ganpatrao Wandhare
    Proceedings of the International Conference on Power Electronics Drives and Energy Systems for Industrial Growth Pedes, 2024
    The substantial increase in demand has also posed a threat to utilities due to nonlinear loads. A recent example is the cluster of EV charging stations with a front-stage rectifier unit followed by passive LC filtering to generate the DC link. These practices lead to power quality issues in the grid because of the nonlinear current extraction. To address these challenges, this paper proposes an Active Harmonic Filter (AHF) incorporating a Sinusoidal Amplitude Integrator (SAI) for harmonic extraction. AHF injects the high-harmonic current components into the Point of Common Coupling (PCC). Thus, the source current is drawn to be of acceptable quality. Traditionally, in synchronous reference frame control techniques, harmonic currents in the grid current are extracted through a low-pass filter. Unbalances in the voltages can lead to synchronization issues and potentially slow down the detection of harmonic currents. Fast and precise harmonic detection can be achieved using SAl-based harmonic detection. The instantaneous power theory-based Phase-Locked Loop (PLL) is implemented to achieve seamless and reliable synchronization. Simulations and experiments are carried out to verify the proposed control.
  • Hybrid Model-Based and Heuristic Optimal Parameter Estimation for a PV-Fed DC-DC Converter with Maximum Power Extraction
    Akshay Chabukswar, Praveen Vankadari, Akurathi Sai Sarath Chandra, Avinash Naramu, Rahul Raj Kar, et al.
    Proceedings of the International Conference on Power Electronics Drives and Energy Systems for Industrial Growth Pedes, 2024
    Precise estimation of photovoltaic (PV) parameters is crucial for extracting the Maximum Power Point (MPP). Heuristic MPP extraction methods suffer from the power oscillations phenomenon, whereas the model-based MPP results in convergence issues due to errors in estimated or measured parameters. In this article, a hybrid model-based and heuristic MPP extraction technique is proposed, where the heuristic approach for MPP extraction compensates for a reduced sensor estimation errors and oscillations in the model-based MPP extraction. The proposed methodology implements an iterative model-based PV parameter estimation to mitigate the above-mentioned drawback. The proposed algorithm estimates the PV equivalent circuit parameters at STC using the iterative technique with an initial guess. It is followed by estimation of irradiance and temperature and updating PV parameters. PV MPP voltage and current extraction is done using model-based iterative Guass-Seidel analysis and a dual-loop boost converter PI control loop. Higher-order polynomial approximation of the transcendental I-V equation is done for plotting PV curves using the estimated values and PV MPP voltage. Heuristric PV curves-based MPP extraction is aided with model-based MPP extraction to compensate for the errors. Simulation-based analysis is carried out for a PV module with a boost MPP converter, and the results for MPP extraction with sensorless estimation is provided for different loading conditions. Further, a prototype of 200 W boost converter is developed and validated for various irradiance and temperature profiles. Simulation and experiment results show the efficacy of the proposed technique for a Boost MPP converter.
  • Hybrid Electric Charging Station with Energy Management under a Weak Grid Scenario
    Rahul Raj Kar, Rupesh Ganpatrao Wandhare
    2023 IEEE 3rd International Conference on Smart Technologies for Power Energy and Control Stpec 2023, 2023
    The paper focuses on an energy management system designed for electric vehicle charging stations incorporating photovoltaic integration, particularly in weak power grids. This study aims to develop a hybrid charging facility for electric vehicles in a weak grid. The proposed approach involves integrating both photovoltaic (PV) and grid power sources to optimize energy utilization in different operational scenarios. The charging station employs a Maximum Power Point Tracking methodology to charge the electric vehicle using PV power when it is available. Without PV power, the system automatically adjusts its operation modes accordingly. The power flow among the PV panels, EV charging station, and grid is decisive based on the power availability and demand conditions. In scenarios where the grid is weak, the performance of the power converters in terms of power injection or absorption is significantly affected. To address these challenges, the study focuses on modelling and designing controllers for the various power electronics converters employed in the system.
  • Energy Management System for Electric Vehicle Charging Stations with Photovoltaic Integration in Weak Grids
    Rahul Raj Kar, Rupesh Ganpatrao Wandhare
    2023 IEEE 20th India Council International Conference Indicon 2023, 2023
    Electric vehicles are becoming popular due to their eco-friendly, sustainable, and cost-effective nature, addressing fuel depletion, environmental collapse, and challenges. The proposed work aims to design and develop a hybrid charging station for electric vehicles in a weak grid, utilizing both photovoltaic (PV) and grid power sources. The proposed strategy aims to enhance grid energy utilization in diverse operating conditions, ensuring optimal performance. The system uses Maximum Power Point Tracking (MPPT) to charge the electric vehicle (EV) directly with solar energy whenever available. The system automatically adjusts its operational modes when solar energy is not accessible. Power availability and demand scenarios determine the power flow between the PV panels, charging station, and the grid. When there is a weak grid, the converter’s power injection or absorption performance suffers significantly. The paper describes the modelling and controller design of the system’s different power electronics converters.
  • PV-Grid Interface Hybrid Energy Management System for EV Charging Station without PLL
    Rahul Raj Kar, Rupesh Ganpatrao Wandhare
    Proceedings of the 11th International Conference on Innovative Smart Grid Technologies Asia Isgt Asia 2022, 2022
    Electric vehicles are gaining popularity as an environmentally benign, long-term, and cost-effective alternative to internal combustion engines based automobiles. It deals with depleting fuel, climate crisis, and pollution. The proposed work focuses on designing a PV grid interface hybrid energy management system for EV-charging stations without using a PLL synchronizing unit. The above methodology ensures that the system functions to optimize grid energy utilisation. The power from PV is extracted via Maximum Power Point Tracking (MPPT). Various operating modes are observed depending on the amount of power available at the PV and the power demand at the charging station. The power may flow from PV to charging station and utility or from PV and grid to charging station depending upon the power availability and demand scenario. The power injection or absorption capability of the converter is significantly affected in presence of a weak grid. The paper provides the details regarding the power electronics-based converter model and their respective controller design that are used in the system.
  • Design of DC Fast Charging Station with Energy Management
    Shubham Sonawadekar, Rahul Raj Kar, Rupesh Wandhare
    Indicon 2022 2022 IEEE 19th India Council International Conference, 2022
    The batteries in electric vehicles (EV) have the potential to serve as a power source in the microgrid. EV batteries can be charged through the grid during the grid to the vehicle mode (G2V) of operation. Further, they can support the grid during peak load demand when EV is in standstill condition i.e. vehicle to grid mode (V2G) of operation. The proposed EV charging station topology integrates solar Photovoltaic (PV), supercapacitor, and grid for fast charging and achieving energy management in microgrids. Supercapacitor+Battery combination acts as a backup for EV charging under peak load conditions which has the ability to charge and discharge at a higher rate. This paper presents the design of a DC fast charging station with grid supply and Solar PV as sources. The system can operate either in grid-supportive mode or DC fast charging mode, depending on available power at various sources. The proposed system overcomes the issues in existing EV charging stations of limited charging rates and unidirectional power flow. The detailed modelling and analysis of the proposed system with their respective controller design are provided in this paper.
  • Energy Management System for Photovoltaic Fed Hybrid Electric Vehicle Charging Stations
    Rahul Raj Kar, Rupesh Ganpatrao Wandhare
    Conference Record of the IEEE Photovoltaic Specialists Conference, 2021
    Recently, Electric Vehicles are attracting significant attention as an environmental friendly, sustainable and economical substitute for vehicles with a conventional engine. It addresses the concerns associated with petroleum fuels, global climate change, and pollution control. In this paper, the design and development of a Photovoltaic (PV) and grid fed Hybrid charging station for electric vehicles is discussed, and the new control strategy is proposed for energy management under different operating conditions. The proposed control ensures the system working in an integrated manner to optimize the energy use from the grid. The system shares power between PV and grid, and directly charge the EV when solar energy is available using Maximum Power Point Tracking (MPPT) and automatically changes modes of operation when solar energy is not available. In addition, the system also delivers the solar power to the grid when solar power is available, but the station is not charging the EV. Reverse power feeding provision is also adapted for the futuristic smart-EV-grid concept where EV shares the grid load. The proposed control strategy can be easily adapted to even for the conventional EV charging stations. This paper provides the detailed modelling and controller design of various power electronics converter used in the system and under varying ambient condition.
  • Design and Modeling of High Power DC-DC Boost Converter for Solar Photovoltaic System
    Rahul Raj Kar, Md. Aftab Alam
    Icsns 2018 Proceedings of IEEE International Conference on Soft Computing and Network Security, 2018
    Integration of renewable energy sources with main power grid has become centre of research activities around the globe. Almost all of the proposed techniques for the purpose of renewable energy source integration incorporates application of DC-DC converters. Therefore, this paper embarks on issue of modeling and validation of DC-DC converter including parasitic elements. The effect of parasitic elements on voltage and current profile as well as reliability of entire system is of paramount importance. State-space based model of DC-DC boost converter has been developed in ideal case and in presence of parasitic elements.

RECENT SCHOLAR PUBLICATIONS

  • A Direct Power Synchronization Based Control of Grid-Connected Converter for EV Charging Station With Hybrid Energy Source under Non-Ideal Grid
    RR Kar, R Wandhare
    IEEE Transactions on Industry Applications , 2025
    2025
  • Sinusoidal Amplitude Integrator-based Harmonic Extraction for Active Harmonic Filter
    P Vankadari, VS Kishore, RR Kar, RG Wandhare
    2024 IEEE International Conference on Power Electronics, Drives and Energy … , 2024
    2024
    Citations: 2
  • Hybrid Model-Based and Heuristic Optimal Parameter Estimation for a PV-Fed DC-DC Converter with Maximum Power Extraction
    A Chabukswar, P Vankadari, ASS Chandra, A Naramu, RR Kar, ...
    2024 IEEE International Conference on Power Electronics, Drives and Energy … , 2024
    2024
    Citations: 1
  • Enhanced stability and control of voltage source converters with lcl filter in weak grid
    RR Kar, R Wandhare
    IEEE Journal of Emerging and Selected Topics in Industrial Electronics 6 (1 … , 2024
    2024
    Citations: 10
  • Passivity principle-based active damper design to enhance stability of a voltage source converter for weak grid scenario
    RR Kar, R Wandhare
    IEEE Journal of Emerging and Selected Topics in Power Electronics 12 (5 … , 2024
    2024
    Citations: 10
  • Energy Management System for Electric Vehicle Charging Stations with Photovoltaic Integration in Weak Grids
    RR Kar, RG Wandhare
    2023 IEEE 20th India Council International Conference (INDICON), 398-402 , 2023
    2023
    Citations: 2
  • Hybrid Electric Charging Station with Energy Management under a Weak Grid Scenario
    RR Kar, RG Wandhare
    2023 IEEE 3rd International Conference on Smart Technologies for Power … , 2023
    2023
    Citations: 2
  • Design of DC Fast Charging Station with Energy Management
    S Sonawadekar, RR Kar, R Wandhare
    2022 IEEE 19th India Council International Conference (INDICON), 1-6 , 2022
    2022
    Citations: 2
  • Pv-grid interface hybrid energy management system for ev charging station without pll
    RR Kar, RG Wandhare
    2022 IEEE PES Innovative Smart Grid Technologies-Asia (ISGT Asia), 145-149 , 2022
    2022
    Citations: 2
  • Energy management system for photovoltaic fed hybrid electric vehicle charging stations
    RR Kar, RG Wandhare
    2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), 2478-2485 , 2021
    2021
    Citations: 7
  • Design and modeling of high power DC-DC boost converter for solar photovoltaic system
    RR Kar, MA Alam
    2018 International Conference on Soft-computing and Network Security (ICSNS … , 2018
    2018
    Citations: 5

MOST CITED SCHOLAR PUBLICATIONS

  • Enhanced stability and control of voltage source converters with lcl filter in weak grid
    RR Kar, R Wandhare
    IEEE Journal of Emerging and Selected Topics in Industrial Electronics 6 (1 … , 2024
    2024
    Citations: 10
  • Passivity principle-based active damper design to enhance stability of a voltage source converter for weak grid scenario
    RR Kar, R Wandhare
    IEEE Journal of Emerging and Selected Topics in Power Electronics 12 (5 … , 2024
    2024
    Citations: 10
  • Energy management system for photovoltaic fed hybrid electric vehicle charging stations
    RR Kar, RG Wandhare
    2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), 2478-2485 , 2021
    2021
    Citations: 7
  • Design and modeling of high power DC-DC boost converter for solar photovoltaic system
    RR Kar, MA Alam
    2018 International Conference on Soft-computing and Network Security (ICSNS … , 2018
    2018
    Citations: 5
  • Sinusoidal Amplitude Integrator-based Harmonic Extraction for Active Harmonic Filter
    P Vankadari, VS Kishore, RR Kar, RG Wandhare
    2024 IEEE International Conference on Power Electronics, Drives and Energy … , 2024
    2024
    Citations: 2
  • Energy Management System for Electric Vehicle Charging Stations with Photovoltaic Integration in Weak Grids
    RR Kar, RG Wandhare
    2023 IEEE 20th India Council International Conference (INDICON), 398-402 , 2023
    2023
    Citations: 2
  • Hybrid Electric Charging Station with Energy Management under a Weak Grid Scenario
    RR Kar, RG Wandhare
    2023 IEEE 3rd International Conference on Smart Technologies for Power … , 2023
    2023
    Citations: 2
  • Design of DC Fast Charging Station with Energy Management
    S Sonawadekar, RR Kar, R Wandhare
    2022 IEEE 19th India Council International Conference (INDICON), 1-6 , 2022
    2022
    Citations: 2
  • Pv-grid interface hybrid energy management system for ev charging station without pll
    RR Kar, RG Wandhare
    2022 IEEE PES Innovative Smart Grid Technologies-Asia (ISGT Asia), 145-149 , 2022
    2022
    Citations: 2
  • Hybrid Model-Based and Heuristic Optimal Parameter Estimation for a PV-Fed DC-DC Converter with Maximum Power Extraction
    A Chabukswar, P Vankadari, ASS Chandra, A Naramu, RR Kar, ...
    2024 IEEE International Conference on Power Electronics, Drives and Energy … , 2024
    2024
    Citations: 1
  • A Direct Power Synchronization Based Control of Grid-Connected Converter for EV Charging Station With Hybrid Energy Source under Non-Ideal Grid
    RR Kar, R Wandhare
    IEEE Transactions on Industry Applications , 2025
    2025