Faculty Publications

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    Phase Current Reconstruction Method With an Improved Direct Torque Control of SRM Drive for Electric Transportation Applications
    (Institute of Electrical and Electronics Engineers Inc., 2022) Ronanki, D.; Pittam, K.R.; Dekka, A.; Parthiban, P.; Beig, A.R.
    Acquisition of the accurate phase currents is indispensable for the control and protection of switched reluctance motor (SRM) drives for electric transportation applications. Existing phase current reconstruction techniques for SRM are implemented under the current control techniques, which generate large torque pulsations. Therefore, the direct torque control (DTC) method can be adopted to minimize torque pulsations and to enhance transient performance in electrified vehicles. However, the existing current estimation methods cannot be applied to DTC strategies due to the simultaneous conduction of all phases at any switching instant. Furthermore, it offers a lower torque per ampere ($T/A$) ratio and draws a high source current. This article addresses the aforementioned concerns by proposing a cost-effective phase current reconstruction method with an improved DTC strategy for a 4-kW four-phase SRM drive. This method employs a 16-sector partition method with a new voltage vector selection by detecting zero-current regions of each phase. As a result, the long-tail currents can be avoided, thereby limiting the simultaneous conduction of all phases. The simulation and test results show that the proposed DTC has minimal torque pulsations, high $T/A$ ratio, low converter losses, and lower source current ripple in comparison to the existing DTC schemes under various operating conditions. Also, the proposed phase current estimation method effectively reconstructs the phase currents under both steady-state and transient operating conditions. © 1972-2012 IEEE.
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    An Integrated Approach for Current Balancing and Open-Circuit Fault Diagnosis for Interleaved Boost Converter
    (Institute of Electrical and Electronics Engineers Inc., 2024) Muhammed Ramees, M.M.K.P.; Ahmad, W.
    Interleaved boost converters (IBCs) are widely used in many applications such as automotive and renewable energy systems due to their high efficiency, reduced input and output ripple currents, and enhanced voltage regulation. Equalizing the current handled by each phase and embedding an open-circuit switch fault detection module will improve the reliability of the converter. This article addresses these challenges by proposing one diode current sensor at the output, thereby avoiding the need for individual current sensors for each phase. The total diode current and input current of the IBC are sensed, from which the individual phase current is reconstructed. The reconstruction strategy involves selecting the proper sampling instant of the diode current and input current depending on the operating duty cycle. The proposed approach is applicable for both the continuous conduction mode and the discontinuous conduction mode of operation of the converter. Using the reconstructed phase current, both the balancing of the phase current and fault detection are performed. A perturbation-based approach is proposed for the balancing of phase current. The faulty phase can be easily detected from the reconstructed phase current. The proposed method is validated on a prototype of a three-phase IBC showing its robustness and effectiveness. © 2024 IEEE.