Faculty Publications
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Publications by NITK Faculty
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Item Advanced control approach for shunt active power filter interfacing wind- solar hybrid renewable system to distribution grid(Engineering and Scientific Research Groups 82 Rue Baudricourt 75013 Paris, 2018) Jayasankar, V.N.; Vinatha Urundady, U.Renewable energy systems utilize the locally available energy resources and generate green energy to meet the increasing load demand. Grid integration of renewable energy systems using power electronic interfaces is the latest trend in this area of research. The non-linear loads at load centers inject current harmonics to the distribution grid at the point of common coupling and pollute the grid. The mitigation of current harmonics in the distribution grid along with the integration of renewable energy systems to the grid is the main focus of discussion in this paper. The interconnection of a hybrid solar-wind renewable energy system with the grid at the distribution level, using a voltage source inverter is presented in this paper. The inverter is controlled using the synchronous reference frame theory based control algorithm, by which the grid interfacing inverter gets additional responsibilities of shunt active power filter. Grid interfacing system consists of a 3-phase, 4-leg voltage source inverter, a dc-link capacitor and a hysteresis current controller. A self-tuning filter is designed and used in the control system for effective elimination of current harmonics. Simulation results are presented with variation in the renewable energy generation and variation in load for validating the practical application of the proposed system. All simulations are done in MATLAB-Simulink platform. The performance of 4-leg inverter in exchanging real power from renewable sources to grid along with compensating current harmonics, under balanced and unbalanced grid voltage conditions are analyzed. © JES 2018.Item A Novel Single-Switch High-Gain DC-DC Converter With Active Switched Inductor(Institute of Electrical and Electronics Engineers Inc., 2024) Diwakar Naik, M.; Vinatha Urundady, U.This brief presents a non-isolated, novel single-switch high-gain DC-DC converter with an active switched inductor (NSSHG-ASI) designed for fuel-cell and photovoltaic (PV) powered systems. It features a quadratic boost converter structure at the front end, followed by an active switched inductor that aids in boosting the voltage levels. This brief covers the steady-state analysis and dynamic modeling of the proposed converter. Furthermore, an effective control strategy has been developed, leveraging the K-factor method, to operate the converter in voltage control mode. This ensures stability, even in the event of significant variations in input voltage. To validate the efficacy of the proposed converter and controller, a practical 110W prototype was meticulously constructed and rigorously tested within a controlled laboratory environment. © 2004-2012 IEEE.Item Investigation and Performance Evaluation of Novel Single-Switch High-Gain DC-DC Converters for DC Microgrid Applications(Institute of Electrical and Electronics Engineers Inc., 2025) Diwakar Naik, M.; Vinatha Urundady, U.; Naik, M.; Bonthagorla, P.K.This paper introduces a novel single-switch, non-isolated high-gain DC-DC converter for solar photovoltaic (PV) and fuel-cell (FC) applications. These energy sources typically provide a continuous supply of current, necessitating a high-gain DC-DC converter that operates in continuous conduction mode (CCM). This converter draws a continuous input current from the supply and delivers a continuous output current to the load. The performance of the converter is thoroughly analyzed through the development of a state-space model and the derivation of the small signal transfer function, which helps in understanding the converter’s dynamic behavior. Detailed comparisons with existing converters are also presented. Furthermore, an output voltage controller is designed using the k-factor method to effectively regulate the output voltage without requiring a current sensor, even in the presence of input voltage variations. To validate the effectiveness of the converter and its controller, a 150 W prototype was constructed and experimentally verified in a laboratory setting. © 2013 IEEE.Item Single-Switch Continuous Current High-Gain DC-DC Converter with Common Ground for Vehicular Applications(Institute of Electrical and Electronics Engineers Inc., 2025) Shetty, S.; Prahllada, A.M.; Vinatha Urundady, U.Efficient power conversion is essential for integrating fuel cells into hybrid vehicles, where high voltage gain, minimal switching devices, high efficiency, and low input current ripple are critical for performance. This paper presents a high-gain quadratic boost DC-DC converter tailored for fuel cell hybrid vehicles, utilizing a switched inductor-capacitor technique with a clamping circuit to reduce voltage stress while maintaining a common ground structure. The converter’s operation, component design, and controller development are analyzed in detail, with comparisons to existing high-gain topologies. A 400V, 200W prototype was constructed and tested under varying supply and load conditions, achieving a maximum efficiency of 93.5% with a gain of 13.33 at 58% of rated power. To validate its performance, a 20% step change in the input voltage was tested, demonstrating a robust transient response. This aligns with practical fuel cell systems, where reactant partial pressure regulation typically keeps input voltage variations within 20%. Experimental results confirm the converter’s scalability for fuel cell vehicle applications, underscoring its potential to advance sustainable automotive technologies. © 2013 IEEE.