Faculty Publications
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Publications by NITK Faculty
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Item Implementation of Single-Phase Two-Switch Midpoint Unidirectional Multilevel Converter System(Walter de Gruyter GmbH, 2018) Roy, P.R.; Parthiban, P.; Babu, B.This paper deals with implementation of a single-phase three level converter system under low voltage condition. The frequency of the switches is made constant and involves change in $-t-on}}$ton and $-t-off}}$toff duration. For this condition the pulse width modulation control scheme for a single phase three level rectifier is developed to improve the power quality. The hysteresis current control technique is adopted to bring forth three-level PWM on the dc side of the bridge rectifier and to achieve high power factor and low harmonic distortion. Based on the proposed control scheme, the line current is driven to follow the sinusoidal current command which is in phase with the supply voltage. By using three-level voltage pattern the blocking voltage of each power device is clamped to half of the dc link voltage. The simulation and experimental results of 20W converter under low input voltage condition are shown to verify the circuit performance. Open loop simulation and hardware tests are implemented by applying a low voltage of 15 V(rms) on the input side. © 2018 Walter de Gruyter GmbH, Berlin/Boston 2018.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.