Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item FPGA based control model with derivative filter for converter(2010) Veeranna, S.B.; Yaragatti, U.R.; Beig, A.R.In this paper, the control model for a digitally controlled DC-DC converter is presented along with derivative filter. The digital implementation of this model gives the detailed description about the gain and phase responses of each block in the digital controller loop. Key problems such as quantization resolution of digital pulse width modulator (DPWM), steady state limit cycle oscillations and loop delay of the controller are discussed and solutions are presented. The controller is implemented in an altera Quartus II 9.0 tool and simulated with an inbuilt simulator. It is observed that the controller utilizes less resource and consumes less power, means that the controller cost can be reduced. ©2010 IEEE.Item Performance study of grid connected fuel cell based distributed generation system with ultracapacitor(2011) Kumar, A.S.; Gaonkar, D.N.; Nayak, S.K.Fuel cell based power generation is becoming one of the promising distributed generation system Fuel cell system can generate power as long as fuel is supplied However fuel cells cannot respond quickly to sudden load change due to slow dynamic response. Hence energy storage system is required during transient period In this paper a grid connected fuel cell system performance is studied considering the ultracapacitor as energy storage device. To interface ultracapacitor with fuel cell bidirectional converter is used Simulation results presented here show that the bidirectional converter effectively controls power flow from ultracapacitor. The dynamic responses of the fuel cell system under different load conditions are presented The results presented in this paper demonstrate the load transient mitigation capability of ultracapcitor. © 2011 IEEE.Item Single inductor dual output buck converter for low power applications and its stability analysis(IEEE Computer Society help@computer.org, 2018) Sankaranarayanan, S.; Vinod, K.C.; Sreekumar, A.; Laxminidhi, L.; Singhal, V.; Chauhan, R.The applications like sensor nodes and wearables, which run on coin/button cell and/or harvested energy source need small form factor and very low power consumption. A single inductor multiple output (SIMO) converter provides saving on inductor count and hence becomes a right choice for such applications. This paper presents a single inductor dual output (SIDO) buck converter targeting light load applications. The architecture uses discontinuous conduction mode (DCM) with pulse frequency modulation (PFM) control and the switching scheme ensures almost zero cross-regulation. The proposed converter is simulated in 180 nm CMOS technology showing zero cross-regulation. An efficiency of above 88% is achieved considering inductor and package losses in load range of micro-Amperes to a few milli-Amperes. This paper also presents a detailed stability analysis and model for the selected SIMO architecture along with some interesting observations and inferences derived from this analysis. © 2018 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 Differential Mode Y-Source DC-DC Converter for Better Performance with Loosely Coupled Inductors(Institute of Electrical and Electronics Engineers Inc., 2018) Reddivari, R.; Jena, D.; Goutham, T.N.Magnetically coupled inductor based impedance source dc-dc boost converters are capable of producing high voltage boost with reduced components and low shoot-through duty ratios (STDR). A Y-source converter (YSC) is one of the prominent topologies in the family of magnetically coupled impedance networks, which offers the highest degree (three degrees) of freedom to the controller to maintain constant output voltage compared to the former magnetically coupled Z-source topologies. However, YSC requires tight coupling (nearly unity) among three coupled windings to generate high voltage boosting. But, the continuation of tight coupling is quite difficult in the design of offline YSC when it involves high switching frequency operations. The leakage inductances are common in the design of any magnetically coupled topologies under high operational frequencies. High voltage overshoots, voltage boost degradations are the consequences of the leakage inductance with loosely coupled inductors. This paper attempts to analyse the effect of leakage inductances mathematically with detailed circuit representation of coupled inductors. In addition, a differential mode Y-source converter (DYSC) is proposed which is derived from the former Y-source network by changing the winding orientation. The performance of the proposed DYSC is analyzed using Matlab/SimulationsTM and also compared with YSC. The hardware results are presented to validate the theoretical simulations of both YSC and DYSC topologies. © 2018 IEEE.Item Comparative Study of PI, PID controller for Buck-Boost Converter tuned by Bio-Inspired Optimization Techniques(Institute of Electrical and Electronics Engineers Inc., 2021) Vittal K, K.; Bhanja, S.; Keshri, A.In this paper the Buck-Boost converter was modelled using state-space averaging approach and simulated in MATLAB/Simulink. Buck-Boost converter with closed loop control, operated with PI and also with PID controller for good voltage regulation. Bio-inspired optimization techniques e.g. GreyWolves optimization Technique (GWO), Genetic Algorithm(GA), Particle Swarm optimization (PSO), Ant-Lion optimization (ALO), Whale optimization Algorithm (WOA) were used for tuning PI and also PID controller based Buck-Boost Converter. In order to find out the performances of PI and PID in the Buck-Boost converter, comparison between optimal values of PI parameters $(\text{K}-{\text{p}},\ \text{K}-{\text{i}})$ and PID parameters $(\text{K}-{\text{p}},\ \text{K}-{\text{i}},\ \text{K}-{\text{d}})$ obtained by all the above mentioned optimization techniques were performed. The transient behaviour for each optimal values of PI and PID controller was investigated when the system subjected to a load disturbance. Also, for each optimal PI and PID controller error performance indices e.g. Integral Squared Error and Integral Absolute Error were evaluated. The comparison proved that the PID is most suitable controller for Buck-Boost Converter as it is damping out the oscillations caused due to load disturbance 87.56% faster than PI controller. Moreover, based on the evaluated values of error performance indices and dynamic behaviour, it has also been proven that GA is best optimization technique among others for tuning PID in a Buck-Boost Converter. © 2021 IEEE.Item Control of CLLC Resonant Converter in Grid Connected Electric Bus charging station(Institute of Electrical and Electronics Engineers Inc., 2022) Bhanja, S.; Joshua, A.M.; Vittal K, K.Battery Energy Storage System(BESS) is essential for a resilient microgrid. Electric vehicle charging stations operating in vehicle to grid(V2G) can act as a portable power source in the microgrid. To regulate the power flow for both BESS and electric vehicle charging stations, a bi-directional converter is necessary. This paper presents a test case where the BESS system and electric bus(EB) charging station are connected in parallel with the utility grid and loads. The Capacitor- Inductor-Capacitor (CLLC) converter is utilized as a bi-directional DC-DC converter. The CLLC converter is widely used due to its simple symmetrical design and ability to achieve soft switching. A novel dual hysteresis band logic along with variable frequency control method has been implemented for the CLLC converter. The DC link voltage, battery current, ZVS, and ZCS operations have all been examined in MATLAB/SIMULINK environment with an appropriate controller. Findings show that the BESS and EB charging station works satisfactorily in both forward and reverse modes. © 2022 IEEE.Item Improved Power Quality of Single Phase On-Board Charger with Wide Voltage Conversion Range(Institute of Electrical and Electronics Engineers Inc., 2023) Vinusha, B.; Kalpana, R.; Kishan, D.For electric vehicle applications, there is a persistent need for on-board chargers that are dependable, effective, compact, and lightweight. In this paper, a non-isolated two-switch buck boost (TSBB) topology is presented for a single-phase on-board charger, which can offer significantly improved performance over single-switch buck-boost converters as SEPIC, CUK, or fly back topologies or other two-switch buck-boost converters. The advantage of this on-board charger is that it can perform high input power quality over a wide output voltage conversion range. This paper presents an analysis of the various modes of the converter and small signal analysis of the converter to design the controller. To validate the effectiveness of the converter simulations results are presented with the help of MATLAB-Simulink. © 2023 IEEE.Item Four-Phase Interleaved Bidirectional DC-DC Converter for Battery Energy Storage System(Institute of Electrical and Electronics Engineers Inc., 2023) Kumar, V.; Nagendrappa, H.This paper presents the operation of a DC-DC converter for bidirectional power transfer with battery energy storage system. The converter topology under study resolves the existing disadvantages of conventional buck - boost bidirectional converter and provides benefits in terms of reduced size with higher efficiency and lower input source ripple current. The performance of non-isolated 4-phase interleaved buck-boost bidirectional converter has been studied using MATLAB simulations. In order to get a better insight, this paper proposes a control method that takes the interaction of 4phase currents into account. In boost mode operation, battery is getting discharged while it maintains the DC bus voltage. In buck mode operation, battery is getting charged at constant current. The design of non-isolated four-phase interleaved bidirectional converter of 150 kW with simulation results are presented to validate the design and performance of the converter. © 2023 IEEE.