Faculty Publications
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Publications by NITK Faculty
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Item A fixed frequency ZVS integrated boost dual three-phase bridge DC-DC LCL-type series resonant converter for large power applications(Institute of Electrical and Electronics Engineers Inc., 2017) Nagendrappa, H.; Bhat, A.K.S.The design of a converter as an example of a high power (>10 kW), fixed frequency controlled three-phase DC-DC LCL-type series resonant converter (SRC) with integrated boost function is described. The specifications of the converter are chosen to match the rating of a linear generator (LG) used in wave energy generation application. The performance of the designed converter has been verified by using PSIM simulation software. The zero-voltage-switching (ZVS) of all the switches is accomplished by designing the converter to operate in the lagging pf mode for a wide input voltage and load variations. Theoretical and simulation results have been compared and presented in the form of a table. Power loss break-down analysis of the designed converter has been done and the summary of results is presented. © 2017 IEEE.Item Fixed frequency control of LCL-T resonant power converter with capacitive output filter(Institute of Electrical and Electronics Engineers Inc., 2017) Reddy, G.V.B.; Nagendrappa, H.In this paper, a fixed-frequency phase shift control is proposed for a 1-phase series-parallel LCL-T resonant converter. Zero-voltage switching (ZVS) of the inverter switches for wide variations in input voltage and load is achieved by designing the converter to operate in above resonance mode. Steady state approximate AC circuit analysis method is used to analyze the converter with fixed-frequency phase shift control. LCL-T converter offers a built-in protection against short-circuiting of the load. LCL-T converter with fixed-frequency control requires a very small change in phase shift to regulate the output voltage for wide variations in input voltage and load. Due to ZVS for the entire input voltage and load variations, the operating efficiency of the converter is high. A 300 W, DC-DC, LCL-T resonant converter is designed for solar energy generation applications. The performance of the converter with the proposed fixed-frequency phase shift control is studied with PSIM simulations. The theoretical and simulation results are compared and presented. © 2017 IEEE.Item Modified Gating Signal Controlled High-Frequency Transformer Isolated LCL-T Type DC-DC Resonant Power Converter(IEEE Computer Society help@computer.org, 2018) Reddy, R.G.; Nagendrappa, H.In this paper, a LCL-T type of resonant power converter using modified gating signals is proposed for PV applications. The fixed-frequency modified gating is adopted to process and control the power flow in the circuit. The converter is designed to operate in lagging pf mode to ensure zero-voltage switching (ZVS) of the inverter switches. Fourier series method is used to analyze the converter in steady-state. The main advantage of LCL-T converter is that it provides protection against load short circuit. It is shown that a small change in pulse width is required to regulate the output voltage for variations in input voltage and load. A 300 W converter is designed and its performance is studied using PSIM simulations. Power loss breakdown analysis is performed. © 2018 IEEE.Item A Novel Dual Transformer Triple Active Bridge to Interface Renewable Energy Storage and Load(Institute of Electrical and Electronics Engineers Inc., 2023) Adarsh, S.; Nagendrappa, H.A novel topology of dual transformer triple active bridge is proposed for interfacing renewable energy storage system with the load. This topology uses series connection of dual transformers to reduce the circulating current and the number of semiconductor devices. Phase shift and duty ratio control are used to control the bidirectional power flow and regulate the load voltage. Duty ratio control also results in zero-voltage switching (ZVS) of all the converter switches for the entire input voltage and load range. The converter is designed to reduce switch stress. The simulation of a 1 kW converter is done to verify its performance for a variable load, supply voltage, and bi-directional power flow. From the results, it is found that the topology regulates the output voltage for variations both in supply voltage and load. In the duty ratio controlled topology, all switches turn on with ZVS for all operating cases. © 2023 IEEE.