Faculty Publications

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    Novel Power Converters for Reconfiguration and Voltage Balancing of Dual Battery Pack Based EV
    (Institute of Electrical and Electronics Engineers Inc., 2022) Kumar, V.; Prabhakaran, P.; Raj, N.
    Battery Electric Vehicles predominantly come with a single battery pack. Reliability and limited driving range are the main obstacles to EV market growth. To overcome these, dual battery pack-based EVs are seen as a promising alternative for the future. This paper presents two novel power converters suitable for dual battery pack-based Electric Vehicles. The proposed converters can configure and connect two battery packs in series or parallel or operate with a single battery pack. The output terminals of the proposed converters can be connected directly to the charger terminal during charging or to the motor drive inverter during traction. When the EV is neither in charging mode nor in traction mode, and if there is a voltage imbalance between the two battery packs, proposed converters can transfer power from the battery pack with a higher terminal voltage to the other one. The converters' transfer function is derived using state-space averaging and small-signal modeling to design the converter's controller in the voltage balancing mode. The controller is designed using the K-factor approach. Detailed MATLAB simulations and hardware experiments are presented to validate the efficacy of proposed converters in different operating modes. © 2022 IEEE.
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    Performance Analysis of Multiphase Interleaved boost converter topologies for FCEV applications
    (Institute of Electrical and Electronics Engineers Inc., 2023) Garg, P.; Vignesh Kumar, V.V.; Kumar, S.
    This paper investigates the performance of multiphase interleaved boost converter topologies for fuel cell electric vehicle (FCEV) system. Fuel cells (FC) have a low voltage and high current characteristics. The output voltage of a fuel cell stack must be increased to approximately 400V ∼ 700V to be suitable for the motor drive system. Therefore, a DC/DC step-up converter is crucial for interfacing fuel cell stack with the DC bus of the vehicle.Owing to the volumetric constraints and other performance requirements, the FC connected DC/DC converter is expected to possess high power density, low weight, high efficiency and good thermal performance. Further, it is of paramount importance to maintain the output current ripple of FC for its enhanced life span. Interleaved boost converter (IBC) topologies are found to satisfy all these requirements of FCEV application. Hence in this paper, a performance comparison of few interleaved topologies appropriate for FCEV drive train is presented. It is observed that six phase IBC is superior to other two variants namely two phase and four phase IBC. The output voltage, input current and losses are analysed for all the three topologies. The design of the closed loop control algorithm is discussed lucidly. The results of extensive simulations carried out in MATLAB environment are presented. © 2023 IEEE.
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    A Four-Port DC-DC Converter for Hybrid Integration of Fuel Cell-Solar PV with Bipolar DC Microgrid
    (Institute of Electrical and Electronics Engineers Inc., 2024) Prasad, S.; Prabhakaran, P.; Arun Dominic, A.D.
    This article describes a novel non-isolated dual-input dual-output DC-DC converter designed for the hybrid integration of Fuel Cell and Solar PV into bipolar DC microgrid systems, enabling single-stage power conversion. Unlike existing non-isolated multiport DC-DC converters, the proposed design offers significant voltage gain with fewer magnetic components. By employing a set of deduced controllers, the proposed converter effectively regulates both inductor current and output voltage, while its symmetrical output structure naturally balances pole voltages. Additionally, the converter can operate as a single-input-dual-output system if either the Fuel Cell or Solar PV source is unavailable. The paper explores various operating modes and presents steady-state simulation results, highlighting the effectiveness of the proposed circuit. © 2024 IEEE.