Faculty Publications
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Item Multiport Converters to Integrate Multiple Sources and Loads - A Review of Topologies(Institute of Electrical and Electronics Engineers Inc., 2018) Adarsh, S.; Nagendrappa, N.With the increase in penetration of variety of renewable energy resources in the grid, energy storage systems are needed to balance power flow and improve the reliability of the system. A compact multiport converter supporting bidirectional power flow is a suitable candidate to interface multiple sources and loads. This paper reviews various multiport converter topologies in the literature. The multiport converters can be classified as isolated, partially isolated and non isolated converters. The converter topologies in each category are identified and reviewed. Their benefits and drawbacks are highlighted. © 2018 IEEE.Item Analysis and Experimental Investigation of Double Switching Active Vector Sequences in Dodecagonal Space Vector Structure(IEEE Computer Society, 2020) Arumalla, R.T.; Figarado, S.; Nagendrappa, N.The PWM technique used in the inverter influence the harmonic content of the inverter output and the switching losses in the inverter. The dodecagonal space vector based PWM schemes are amongst the popular harmonic elimination schemes for an open-end winding induction motor drive. These techniques give a better harmonic profile by eliminating the dominant lower-order harmonics (fifth and seventh) from the output voltage of an inverter in the entire modulation range. In this paper, double switching active vector sequence based bus-clamping PWM schemes are developed for dodecagonal SV structure, wherein one of the active vectors in a sector is switched twice in every sub-cycle period. These techniques are named as dodecagonal space vector based advanced bus-clamping PWM (ABC12PWM) techniques. The proposed PWM techniques give a better harmonic profile at higher modulation indices as compared to the dodecagonal conventional space vector PWM (C12SVPWM) and dodecagonal bus-clamping PWM techniques (BC12PWM) techniques. The analysis of total RMS harmonic distortion and switching losses are done for the proposed schemes, and the obtained results are compared with C12SVPWM and BC12PWM techniques. The implementation of proposed PWM schemes is done on a laboratory scale induction motor drive. © 2020 IEEE.Item Magnetic Coupling Characteristics of Spiral Square - Circular Coupled Coils for Wireless EV Battery Charging System(Institute of Electrical and Electronics Engineers Inc., 2020) Kishan, D.; Vinod, M.; Nagendrappa, N.Electric Vehicles (EVs) are gaining continuous interest due to higher efficiency than internal combustion engine vehicles, and environmentally friendly nature. Nowadays, most of the EV uses the conductive charging method to charge the battery. Besides that, wireless inductive charging technology for EV has recently received a great attention because of the advantages such as increased user convenience and safety. In this method of charging mutual inductance between the wireless inductive coils is the crucial factor. Hence, this paper describes the mutual inductance characteristics of the transmitter with spiral square - receiver with circular (i.e., interoperability spiral square and spiral circular of coils) at various vertical distances using FEM simulations. © 2020 IEEE.Item Current Source Isolated Bidirectional Series Resonant DC-DC Converter for Solar Power/Fuel Cell and Energy Storage Application(IEEE Computer Society, 2021) Bathala, K.; Kishan, D.; Nagendrappa, N.This paper presents the performance analysis of a current source isolated bidirectional DC-DC converter (CSIBDC) for PV and Fuel Cell (FC) applications. The proposed CSIBDC converter has been chosen to integrate solar power with energy storage systems. Since the solar power is intermittent in nature and it has no dispatch ability on its own, the proposed converter can enable small voltages available from PV to step up by operating in the boost conversion mode. The current source dual active bridge (DAB) converter topology is a good choice for battery charging and discharging applications due to its bidirectional power transfer capability. To achieve high power density with ZVS transition, the proposed dual active bridge converter is operated with phase shift control technique. In order to evaluate the performance of the proposed DAB converter the simulations are carried out using PSIM software. © 2021 IEEE.Item A 10 kW ZVS integrated boost dual three-phase bridge DC–DC resonant converter for a linear generator-based wave-energy system: Design and simulation(MDPI AG indexing@mdpi.com, 2019) Nagendrappa, N.; Bhat, A.K.S.The design and performance analysis of a 10 kW three-phase DC–DC LCL-type resonant converter having a built-in boost function were carried out. This high-power converter is proposed for its application in grid-interfacing a linear generator (LG)-based wave-energy system. Fixed-frequency control is used, and the converter was designed to operate with a lagging power factor. It is shown that all switches turn on with zero-voltage switching (ZVS) for wide input voltage and load variations. This results in reduced switching losses and stresses, which is very important in large-power applications. The performance of the converter was studied through PSIM simulation software. Theoretical and simulation results are presented for comparison. Power-loss break-down analysis of the designed converter was carried out and the summary of results is presented. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.Item Analysis and Design of a High-Frequency Isolated Full-Bridge ZVT CLL Resonant DC-DC Converter(Institute of Electrical and Electronics Engineers Inc., 2019) Patil, U.; Nagendrappa, N.In this paper, a new pulsewidth modulated gating scheme and a zero-voltage transition (ZVT) auxiliary circuit is proposed for a fixed frequency full-bridge CLL dc-dc resonant converter with a 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 200-W power rating operating at a switching frequency of 100 kHz. The converter with applied gating scheme and ZVT auxiliary circuit provides zero-voltage switching to all the switches for the entire variations in loading and input voltage conditions ensuring higher conversion efficiency. PSIM simulations are carried out to verify theoretical predictions about the performance of the converter for various operating conditions. Finally, experimental results are provided to verify the feasibility of the proposed converter. The theoretical, simulation, and experimental results are given and discussed. © 1972-2012 IEEE.Item Performance evaluation of high-frequency CLL resonant DC–DC converter operated with phase-shift and modified PWM gating scheme: Analysis, design and implementation(Institution of Engineering and Technology, 2020) Patil, U.; Nagendrappa, N.Normal phase-shift and modified pulse-width modulation gating schemes are proposed for a full bridge high-frequency capacitor–inductor–inductor (CLL) resonant DC–DC converter, and its performance is analysed in this study. Detailed modelling and the steady-state analysis of the converter are performed by using the fundamental harmonic approximation approach. Various modes of the converter operation with both the gating schemes are described and examined in detail. Zero-voltage switching of all the main switches is achieved by designing the resonant converter to operate in the above resonance mode. The optimum design of the converter is illustrated with the help of a flowchart and design curves. PSIM simulation is carried out and the experimental prototype is built to substantiate theoretical performance predictions. The simulation and experimental results are presented and compared. © The Institution of Engineering and Technology 2020Item Duty ratio control ofthree port isolated bidirectional asymmetrical triple active bridge DC-DC converter(Institute of Advanced Engineering and Science, 2021) Adarsh, S.; Nagendrappa, N.Multiport converters are used in interfacing of distributed energy sources with grid/load. Isolated converters are needed in applications where converter gain is high and there is a requirement of isolation. Dual transformer asymmetric triple active bridge offers the advantage of reduced circulating current. However, the operating range is low for variation in load and source voltage. In this paper duty ratio modulation technique is proposed to regulate the load voltage and control the power flow in both the directions. As a result of the new gating scheme, the converter switches operate with ZVS, irrespective of variations in load power and source voltage. The converter is designed to ensure high switch utilization. The control technique is validatedthrough simulation of a 1kW three port DC-DC converter. It was observerd that the load voltage was regulated for wide range of variation in load power and source port voltages. The single input dual output mode was also verified. © 2021, Institute of Advanced Engineering and Science. All rights reserved.Item Selective Lower Order Harmonic Elimination in DC-AC Converter Using Space Vector Approach(Institute of Electrical and Electronics Engineers Inc., 2021) Arumalla, R.T.; Figarado, S.; Panuganti, K.; Nagendrappa, N.A novel space vector-based approach is introduced in this brief to selectively eliminate the lower order harmonics from the DC-AC converter output waveform by making use of double switching clamping sequences. This technique uses a volt-second balance for control of fundamental voltage while using the dwell time rearrangement of the active vector in a sub-cycle to obtain the elimination of fifth or seventh harmonics. Further, the closed-form expression of the dwell time-division coefficient (DTDC) for the active vector dwell time division rearrangement is expressed. The proposed PWM technique is compared with other space vector-based PWM techniques in terms of voltage weighted total harmonic distortion, switching power loss, and lower order harmonic magnitudes. Further, the experimental results are presented to show the effectiveness of the proposed PWM techniques in terms of harmonic elimination. © 2004-2012 IEEE.Item High frequency isolated bidirectional dual active bridge DC-DC converters and its application to distributed energy systems: an overview(Institute of Advanced Engineering and Science, 2023) Bathala, K.; Kishan, D.; Nagendrappa, N.Among the DC-DC converters, an isolated bidirectional dual active bridge converter is a core circuit for high-frequency power converters in distributed energy system applications. These high-frequency power conversion systems attract academia and industry due to various advantages, such as high-power density, less weight, reduced noise, high efficiency, low cost and high reliability. First, the importance of power electronic converters in modern-day life is introduced. Second, a topological overview of voltage-fed and current-fed isolated bidirectional dual active bridge converters is presented with their importance in integrating hybrid power sources. Third, switching modes of isolated bidirectional DC-DC converters are also presented with a degree of freedom of control. Forth, performance evaluation of voltage-fed and current-fed isolated bidirectional converters has been presented with an example. Their suitability in integrating fuel cells and photovoltaics with energy storage systems in low to medium-power applications is presented. © 2023, Institute of Advanced Engineering and Science. All rights reserved.