Faculty Publications

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Publications by NITK Faculty

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Author: search.filters.author.Ahmad, Md.W.Has files: No

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    Enhanced electric vehicle battery management system employing bat algorithm with chaotic diversification strategies
    (John Wiley and Sons Inc, 2024) Vani, B.V.; Kishan, D.; Ahmad, Md.W.; Reddy, C.R.P.
    As the demand for electric vehicles (EV) continues to increase, the need for effective charging and switching of battery systems becomes more important. This article presents a method using the Bat Algorithm (BA) improved by chaotic diversification as well as social education to optimize the power source replacement and the electric vehicle charging procedure. The plan is intended to solve the issues of payment delay and battery management failure. The algorithm searches for better positions by combining chaotic diversity, while social learning supports the coordination of battery stations. Thanks to extensive simulation and real-world testing, our approach shows significant improvements in optimization and a reduced payback period. The results show that the suggested approach outperforms the current algorithms in terms of rotation speed and good solution. This research supports the development of efficient transportation by providing practical solutions to increase the efficiency of electric vehicle transfer and payment and ultimately encourage greater effort. © 2024 The Author(s). IET Power Electronics published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.
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    A Noninvasive Sliding Mode Observer Based Approach for Detecting Open-Circuit Faults in HERIC Inverters
    (Elsevier Ltd, 2024) Muhammed Ramees, M.K.P.M.; Ahmad, Md.W.
    This article presents a new technique for detecting and localizing the open-circuit (OC) faults in the semiconductor switches of the Highly Efficient and Reliable Inverter Concept (HERIC) converter. It is a transformerless Photovoltaic (PV) inverter based on the full-bridge topology, with two extra switches on the AC side called ac bypass switches. The proposed method uses a sliding mode observer (SMO) to detect faults in the AC bypass switch and main switches of the full bridge inverter. To diagnose OC faults in the AC bypass leg, two parallel SMOs are created based on the converter's state space model. Similarly, two SMOs are designed for the main switches. A residual is generated by combining the observed and measured grid currents to accurately locate the OC fault within the inverter system. To localize the faulty main switch, once the fault is detected the inverter is reconfigured and based on the grid current the faulty switch is identified. A major benefit of this method is that it does not rely on additional sensors for fault diagnosis, making the system more robust. The effectiveness and reliability of this approach are demonstrated through simulation studies. In addition, a laboratory prototype is developed to validate the practical applicability of the method. © 2024 The Author(s)
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    A Reduced Capacitance H-9 Five-Level Switched Boost Capacitor Transformerless Inverter
    (Institute of Electrical and Electronics Engineers Inc., 2025) Ahmed, Md.S.; Raushan, R.; Ahmad, Md.W.
    Transformerless switched capacitor-based multi-level inverters are well-known for their applications in industrial and renewable energy systems. The primary features of a switched capacitor-based transformerless inverter should be minimizing leakage current for safety and minimizing ripple current for efficiency and reliability. This brief proposes a new single-stage, single-phase, five-level H-9-based transformerless inverter for standalone PV systems. This H-9 inverter, utilizes nine switches to produce the desired output voltage levels. It achieves boost functionalities by combining the switched capacitor (SC) unit with the switched boost (SB) unit in a single design. This topology effectively mitigates the leakage current by virtually grounding the load terminal through the filter capacitor. Furthermore, the ripple current of the capacitors in the switched-capacitor unit is minimized, and it is inherently balanced. To this end, the feasibility of utilizing the modulation technique for control is demonstrated, and the relevant results are experimentally validated using a laboratory prototype of the proposed converter. © 2004-2012 IEEE.