Faculty Publications
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Item 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.Item Fault-Tolerant Operation of Switched Reluctance Motor Using Cascaded Current and PWM Control With Effect of Commutation Angle Variation(Institute of Electrical and Electronics Engineers Inc., 2024) Reddy, J.S.; Parthiban, P.This paper presents a proposed fault-tolerant control strategy for Switched Reluctance Motor (SRM) drives, utilizing cascaded current and pulse width modulation (PWM) control mechanisms with commutation angle variation. The study systematically evaluates the mechanical performance of SRM drives by regulating voltage and current to achieve robust dynamic response under various fault conditions. Optimal commutation angles are identified to enhance operational efficiency and balance performance under fault scenarios. The comprehensive simulations use a 4 kW, 4 φ, 8/6 SRM model in MATLAB/Simulink; further, real-time experiments are conducted using FPGA-based modelling with a Controller Hardware-in-Loop (CHIL), setup on the OPAL-RT 4510 platform. The proposed control technique demonstrates high fault tolerance and reliable mechanical performance, making it suitable for variable-speed drive applications. The findings underscore the potential of the proposed control strategy to ensure the robust operation of SRM drives in practical implementations, highlighting its significance for enhancing the reliability and efficiency of electric drive systems. © 1972-2012 IEEE.Item Analyzing the Performance of Fault-Tolerant Switched Reluctance Motor Control Strategies With Novel Commutation Angle Variation(Institute of Electrical and Electronics Engineers Inc., 2024) Santhosh Reddy, J.; Parthiban, P.This paper analyzes control techniques using a novel commutation angle variation for fault-tolerant operation in Switched Reluctance Motor (SRM) drives. It explores the use of hard chopping hysteresis current control (HCC) and pulse width modulation (PWM), and proposes a cascaded current and PWM technique for fault-tolerant SRM drive operation. The HCC method is most effective for low-speed operations with higher external loads, while the PWM method is suitable for medium to high-speed operations but it can't control current effectively at high external loads. The proposed control technique approach is developed to address the limitations of HCC and PWM methods, by combining current and PWM methods with optimized commutation angle control. This approach effectively controls current and variable speed operations even under fault conditions. This paper evaluates control strategies by varying commutation angles to determine the optimized angles that ensure balanced performance and better operation under fault conditions. This paper assesses the mechanical performance under light and high external loading conditions at optimized commutation angles during open circuit fault conditions. Simulation studies are conducted using a 4 kW, 4-phase, 8/6 SRM configuration on the MATLAB/Simulink platform. Additionally, real-time FPGA-based modelling experiments are performed using a Controller Hardware-in-Loop (CHIL) setup on the OPAL-RT 4510 platform. The performance analysis highlights the importance of identifying the best control techniques to ensure high fault tolerance and reliable mechanical performance, making this approach promising for variable-speed drive systems. The findings of this study significantly advance fault-tolerant SRM control techniques, enhancing their suitability for various industrial applications. © 2013 IEEE.