Faculty Publications
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Publications by NITK Faculty
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Item Design methodology and sensorless control of electric propulsion system using DTC-SVM(Institute of Electrical and Electronics Engineers Inc., 2017) Parthiban, P.; Ronanki, D.Electric propulsion system (EPS) employing Induction Motors (IM) have gained acceptance due to their robust structure, reliability, technological advancement and low cost. This paper presents the technical considerations and design methodology of EPS for urban cars. Direct torque control (DTC) is a prominent technique in controlling the IM due to its easy configuration and fast performance. Nevertheless, it generates high torque ripple coupled with variable switching frequency. To get sophisticated results like ripple free torque and constant switching frequency, IM can be controlled by DTC scheme using the space-vector modulation (SVM) technique. The speed of the motor is estimated in limp-home mode operation of the vehicle by rotor flux based model reference adaptive system (MRAS). The performance of IM in limp-home mode of electric vehicle using DTC and DTC-SVM techniques considering the drive cycle are presented. © 2017 IEEE.Item Geometrical pole shape optimization of an outer rotor synchronous reluctance motor for output torque enhancement(Institute of Electrical and Electronics Engineers Inc., 2024) Chauhan, V.K.S.; Koorata, P.K.This article explores optimizing design for Permanent magnet (PM) free outer rotor synchronous reluctance machines to be used as in-wheel motors for electric vehicles. The primary objective is enhancing torque output by systematically analyzing various rotor pole shapes and parameters such as pole depth, arc angles, rib thickness, channel width, and fillet radii. These parameters were studied on four different types of pole shapes. Using ANSYS Maxwell software, the analysis is performed on an outer rotor motor with a diameter of 190 mm and a rated speed of 1200 RPM. The results indicate that outer rotor machines with configurations such as an inner arc angle of 9 degrees and an outer arc angle of 24 degrees exhibit optimal torque output for pole shape 1. Moreover, the study reveals that an increase in pole depth (SB) corresponds to an increase in torque output, while rib thickness reduces torque output. Additionally, the research explores the impact of fillet radii on torque performance. This study provides the effects of essential features of critical design parameters on reluctance torque for maximizing average torque in outer rotor motors utilized in EV applications. © 2024 IEEE.Item Single Inductor Dual-Input Boost DC-DC Converter for Electrical Vehicle Applications(Institute of Electrical and Electronics Engineers Inc., 2024) Shetty, L.G.; Naik, S.; Moger, T.; Jena, D.The implementation of single inductor dual input boost dc-dc converter is discussed in this paper which is useful in Electric Vehicle(EV) applications. The circuit is compact and have a limited number of components. The proposed converter has potential to be advantageous due to its simple form, good voltage amplification ratio, and comparatively greater efficiency. The steady-state analysis is studied in detailed. The required transfer functions were generated from a thorough dynamic study of the converter based on the converters small signal model. The simulations are done using the MATLAB/Simulink environment. The results are validated with the Hardware in Loop (Opal-RT). © 2024 IEEE.Item Comparative Analysis of Multi-Port DC-DC Converters for Electric Vehicle Applications(Institute of Electrical and Electronics Engineers Inc., 2024) Naik, S.; Shetty, L.G.; Jena, D.; Moger, T.To provide an adequate energy infrastructure for electric vehicles. Multi-port converters offer superior design and execution capabilities than single-port converters, making them particularly advantageous for Electric Vehicles(EVs), The non isolated multi-port dc-dc converter(MPC) topologies are employed in regulating the power distribution across various modules, including photovoltaic (PV) systems, fuel cells (FC), batteries, energy storage systems (ESS), and loads. In this paper few topologies, Multiinput Multioutput (MIMO) boost converter, Dualinput Dualoutput (DIDO) converter, Dualinput hybrid step-up converter(DIHDC), and Four-port converter(FPC), are studied. This will give a thorough analysis of each topology and a detailed performance comparison to aid in the complete under-standing of the benefits and downsides. This study compares a number of components, modes of operation, direction of power flow capability, and design aspects. The simulations study are carried out in MATLAB/Simulink, and are validated with OPAL-RT. © 2024 IEEE.Item Renewable Power Integration for Electric Vehicle Charging System: A Review(Institute of Electrical and Electronics Engineers Inc., 2025) Nirala, P.K.; Barik, A.K.; Bhushan, R.; Jagtap, K.M.; Raushan, R.This review paper accentuates on the conceivable integration of renewable based generations to the charging stations of Electric Vehicles (EVs) towards restraining the carbon emissions. The intensifying global demand for EVs in recent days puts stress on conventional grid with existing infrastructure, which could be relaxed by integration of renewable based power generations with ecological balance. The importance and feasibility of renewable integrations to charge the EVs are reviewed in this paper and suitable applications are reported to develop charging infrastructures for EVs. The importance of vehicle to grid (V2G) concept is also reviewed to facilitate ancillary support to future grid integrated with renewables. © 2025 IEEE.Item Quadratic Switched Inductor-Capacitor Multi-Port Converter for DC Microgrid Application(Institute of Electrical and Electronics Engineers Inc., 2025) Naik, S.; Jena, D.; Moger, T.This article presents a Multi-Port Quadratic Switched Inductor-Capacitor DC-DC converter topology tailored for DC-microgrid applications. A Non-isolated Quadratic Switched Inductor-Capacitor Multi-Port Converter (QSICMPC) is proposed, and designed to integrate hybrid energy sources efficiently to generate the constant load voltage for DC-Microgrid. The cross-connected capacitors with output side inductor in the converter function as voltage doubler circuit, providing an additional voltage boost. Compared to existing converters, the proposed design requires fewer components while achieving a higher voltage gain. Furthermore, it features continuous input current, reduced diode voltage stress, and lower voltage ratings for passive components. The converter offers a wider voltage gain range and reduced voltage stress on power switches. This study highlights its operational modes and detailed steady-state analysis, and comparisons are underscoring the significance of the proposed design. © 2025 IEEE.Item Voltage Multiplier Cells Non-isolated Dual Input DC-DC Converter with Wide Voltage Gain for EV Charging Applications(Institute of Electrical and Electronics Engineers Inc., 2025) Naik, S.; Jena, D.; Moger, T.This paper will give Voltage Multiplier Cells based Non-isolated multi-port(VMC-NIMP) DC-DC converter utilizing a switched capacitor design which integrated with Hybrid energy sources based Photo voltaic (PV) -Fuel cell (FC) to EV charging applications. A non-isolated transformer-less Multi-Port DC-DC Converter is designed with the integration of hybrid energy sources. A voltage multiplier circuit will boost and improve the converter's gain. This design is having lesser ripples when compared to available converters. This has fewer components and a higher gain than the existing converters. This designed converter features a wider voltage enhancement, less voltage stress on the power switches, and a shared ground connection between the input and output terminals. This will gives operational modes, steady-state and comparison analysis to show the converter's importance in EV-Charging applications. © 2025 IEEE.Item Gridable Electric Vehicle (GEV) Aggregation in Distribution Network to Support Grid Requirements: A Communication Approach(Walter de Gruyter GmbH info@degruyter.com, 2017) Hampannavar, S.; Chavhan, S.; Yaragatti, U.R.; Naik, A.Electric Vehicles (EV) can be connected to the grid for power transaction and also serve as distributed resource (DR) or distributed energy storage system (DESS). The concept of connecting group of EVs or gridable EVs (GEV) to the grid is called Vehicle-To-Grid (V2G). V2G is a prominent energy storage system as it is flexible and can be used to support the grid requirements in order to meet the time varying load demand. Optimal placement of GEV aggregation in power distribution network is very challenging and helps in maintaining stability of the power system for a shorter duration of time. In this paper, algorithm is developed for estimating parameters like Ploss, Qloss, Vpu based on past history and wireless access support for Control and Monitoring Unit (CMU) to aggregator agent communication is proposed using Long Term Evolution (LTE) protocol. The load flow studies are carried using MiPOWER software in order to obtain the optimal location for the placement of GEV aggregation in power distribution network. LTE physical layer is modeled using MATLAB/SIMULINK and the performance is analyzed using bit error rate (BER) v/s signal to noise ratio (SNR) curves. © 2017 Walter de Gruyter GmbH, Berlin/Boston 2017.Item DC-link current based position estimation and speed sensorless control of a BLDC motor used for electric vehicle applications(De Gruyter Open Ltd, 2021) Febin, F.D.; Jayan, J.; Srinivasan, M.K.; Prabhakaran, P.Sensors of any kind contribute to extra space and electronics when they are used in any application. Besides, the sensor noise also has the effect of altering the overall gain of the system. This is more prevalent in non-linear systems like motor control. In applications which have strict space constraints like Electric vehicles, the use of sensors must be optimized, which, in turn, gave rise to many sensorless state estimation strategies. This paper proposes a novel sensorless control technique for brushless direct current (BLDC) motor used in electric vehicle applications. The concept of sensorless control in BLDC Motor drive eliminates the hall-effect position sensor, thereby giving better performance and improves the robustness of the overall drive system. The main objective of this work is to estimate the position of the motor at standstill condition using stator saturation effect concerning the rotor, accelerate the motor from standstill so that enough back EMF is generated. This acceleration technique speeds up the motor to a stage where a self-actuating control mechanism is used to generate control signals with back EMF or line voltages. The motor can be started with a load, which is a significant constraint for electric vehicle application. The proposed method will avoid the reverse rotation of the motor. The proposed work is simulated in Matlab/Simulink software, and results obtained show that it works well under dynamic conditions of starting, acceleration and load switching. The hardware setup of the proposed work is developed using the TMS320F2812 DSP processor. Simulation and experimental results validate the effectiveness of the proposed work for electric vehicle application. © 2021 Walter de Gruyter GmbH, Berlin/Boston 2021.Item A novel nine-level boost inverter with a low component count for electric vehicle applications(John Wiley and Sons Ltd, 2021) Shiva Naik, B.S.; Yellasiri, Y.; Aditya, K.; Nageswar Rao, B.N.In electric vehicles (EVs), considerable battery cells are cascaded in series for motor driving to improve the output voltage. The series combination of battery cells causes challenges like isolation of faulty cells, voltage unbalance, and slow charge equalization. Therefore, state-of-charge (SOC) and voltage equalization circuits are often used in industries to protect the battery cells. A nine-level inverter circuit with a double voltage boost is proposed to reduce the above issues based on the switch-capacitor (SC) principle. Unique features like self-balancing, voltage boosting are attained, which cannot be achieved through traditional inverters. The proposed topology can operate at a wide range of modulation indices ((Formula presented.)) to produce different voltage levels. The absence of a back-end H-bridge in the proposed circuit offers low voltage stress across the semiconductors. The operating principle, capacitor sizing, and modulation approach are presented. Further, experimental tests are conducted at different loading conditions to verify the performance of the proposed circuit. © 2021 John Wiley & Sons Ltd.