Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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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 Analysis and design of a high frequency isolated full bridge CLL resonant DC-DC converter for renewable energy applications(Institute of Electrical and Electronics Engineers Inc., 2018) Patil, U.; Nagendrappa, H.In this paper, a new PWM gating scheme is proposed for fixed frequency full-bridge DC-DC CLL resonant converter with capacitive output filter. An approximate complex ac circuit approach is used for the steady state analysis of the converter. The optimum design of the converter is described with the help of design curves for a sample converter of rating 200 W, 40-80 V DC input and output DC voltage of 200 V. By applying the proposed gating scheme, higher conversion efficiency is obtained due to zero-voltage-switching of the converter switches for wide variations in input voltage and the load. PSIM simulations are performed to verify theoretical predictions about the performance of the converter for variations in load and input voltage. The theoretical and simulation results are given and discussed. © 2018 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 Challenges in Developing Hardware-In-Loop Model of Cage Induction Motor with Eccentricity Fault(IEEE Computer Society help@computer.org, 2018) Ilamparithi, T.; Rangachar, B.; Rangineedi, T.; Nagendrappa, H.In this paper, an attempt is made to develop a MATLAB based Hardware-In-Loop compatible model of a three phase cage induction motor with a provision to accommodate eccentricity fault. The major benefits of the attempted work include compatibility with commercially available real-time simulators, facilitation of testing motor control units of electric vehicles when the motor is subjected to eccentricity fault, and ability to simulate in real-time varying severities of eccentricity fault. Modeling of the eccentricity fault is made by using the widely adopted modified winding function approach. Real-time simulation of the developed model is attempted by building a MATLAB model that utilizes pre-computed inductances for real-time execution. Finally, the major challenges encountered in this attempt are presented and discussed to pave way for further research. © 2018 IEEE.Item Design of Spiral Square Inductive Power Pads with Misalignment for Wireless Power Transfer System(Institute of Electrical and Electronics Engineers Inc., 2021) Vinod, M.; Kishan, D.; Nagendrappa, H.; Kannan, R.Wireless power transfer (WPT) can find the potential applications reaching from power transfer to low power appliances to high power electric vehicle battery charging and industrial systems applications. Inductive power pads are the key components for magnetic induction based WPT systems. Hence, this paper labels the analysis of magnetic coupling characteristics of spiral square inductive pads with various misalignments. In this process the inductive power pads are designed in FEM simulation. The modelling approach is presented to calculate the coupling coefficient, self and mutual inductance of spiral square inductive pads of WPT system and also presented the power and efficiency analysis of the system. © 2021 IEEE.Item Comparative Analysis of Symmetrical and Asymmetrical Phase Shift Control Strategy for Resonant Wireless Inductive Charging System(Institute of Electrical and Electronics Engineers Inc., 2021) Vinod, M.; Kishan, D.; Nagendrappa, H.; Dastagiri Reddy, B.D.This paper describes the operation and performance analysis of series/series resonant wireless inductive charging system with symmetrical phase shift (SPS) and asymmetrical phase shift (APS) control strategies. The H-bridge inverter switches of the resonant wireless inductive charging system (RWICS) are designed to operate with zero voltage switching. The comparison of the SPS, APS switching strategies are discussed in regulation of output voltage for different loading conditions and step change in the reference voltages. It is found that the system efficiency is higher with APS control strategy. Also, the variation in pulse-width angle required for controlling the output voltage is small for various loading conditions in APS compared to the SPS. The MATLAB/Simulink Simulation results confirmed that APS control strategy provides superior performance than SPS control for different loading and different output desired conditions. © 2021 IEEE.Item Analysis and Design of a Three Phase Interleaved CLL Resonant Converter with Fixed Frequency Modified PWM Control(Institute of Electrical and Electronics Engineers Inc., 2021) Patil, U.; Nagendrappa, H.A Three-phase interleaved CLL resonant DC-DC converter with fixed frequency modified PWM gating pattern is presented in this paper. The main benefit of the interleaving technique of the converter is to achieve higher power level, while reducing the size of filters due to lower ripples. Three identical single-phase full bridge inverter circuits with CLL resonant tank are allied in parallel on the primary of the high-frequency (HF) transformer. The operating modes of the converter for different intervals are explained with the aid of key operating waveforms. The fundamental harmonic approximation (FHA) approach is used to carry out the steady-state analysis of the converter. A 600W converter is designed and the design method is explained. PSIM simulations are done to substantiate the calculated predictions of the converter for distinct operating conditions. © 2021 IEEE.Item Fuzzy Logic Based Totem pole- PFC Converter(Institute of Electrical and Electronics Engineers Inc., 2023) Khaza, M.F.; Thakur, S.; Nagendrappa, H.; Balasubramanian, B.Power quality is always a major threat to grid-connected systems. Different topologies can be used in EV chargers. However, due to several limitations in the active Power Factor Correction (PFC) and proportional-integral (PI) based PFC has led to exploring advanced schemes. This paper presents novelty by introducing fuzzy logic with totem pole power factor correction. An attempt has been made to use this PFC for Electric Vehicle (EV) chargers. Totem pole topology offers high efficiency, low conduction loss, and high speed. The proposed scheme uses two loops with an inner loop having a current error amplifier to control the input line current and the outer loop involving fuzzy logic controller (FLC), to control the output voltage. This makes the input current be shaped in phase with input voltage accordingly with reference parameters. The proposed system is verified using extensive simulations in MATLAB/Simulink and the results are compared with PI-based PFC. Results show that the proposed scheme improves the performance significantly with total harmonic distortion (THD) limited to IEEE standards limit having nearly unity power factor. © 2023 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.