Faculty Publications
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Publications by NITK Faculty
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Item Review of developments in BLDC motor controllers along with study of four-quadrant operation and active Power Factor correction(Institute of Electrical and Electronics Engineers Inc., 2016) Krishnan, T.V.; Samskrit; I Vittal, K.P.This paper presents a review on recent developments in BLDC motor controllers and studies on four quadrant operation of BLDC drive along with active PFC. The main areas reviewed include Sensor-less control, Direct Torque Control (DTC), Fuzzy logic control, controller for four quadrant operation and active Power Factor Corrected (PFC) converter fed BLDC motor drive. A comprehensive study has been done on four quadrant operation and active PFC converter fed BLDC motor drive with simulation in MATLAB/SIMULINK. The proposed control algorithm for four quadrant operation detects the speed reversal requirement and changes the quadrant of operation accordingly. In PFC converter fed BLDC motor drive, a Boost converter working in continuous current mode is designed to improve the supply power factor. © 2015 IEEE.Item Remote Triggered Laboratory for Boost Converter Using LabVIEW(Springer Science and Business Media Deutschland GmbH, 2021) Ansal, V.; Remya, V.K.; Jagadeesh, V.K.; Krishnan, K.This paper aims to provide remote access to laboratories in power electronics to all levels from under graduate to research. The platform is focused on learning aspect as much as performing the experiments. Remote triggered power electronics laboratory for boost converter experiments has been developed using National Instruments(NI) data acquisition device myRIO and LabVIEW software package which has an extensive support for interfacing devices and instruments. LabVIEW software is used to access the data using myRIO which has both the processor and Field Programmable Gate Array (FPGA). Through Graphical User Interface (GUI), a user in remote location is able to vary parameter pertaining to boost converter circuit which is transmitted to laboratory PC that has NI LabVIEW installed in it. The input is further fed to circuit, and then, output is fed back to LabVIEW through NI myRIO which ultimately is returned to user’s PC using web-publishing tool and can be viewed through GUI. Remote Triggered (RT) power electronics laboratories can be effectively used to give laboratory demonstrations to large number of learners. © 2021, Springer Nature Singapore Pte Ltd.Item Loss Analysis of Conventional and Three Level Boost DC-DC Converters employed for MPPT in PV Systems(Institute of Electrical and Electronics Engineers Inc., 2022) P, P.R.; Vignesh Kumar, V.K.; Balasubramanian, B.Photovoltaic (PV) systems are often exposed to nonuniform insolation due to shading. Under these conditions, there exists multiple peaks in their power-voltage (P-V) characteristics and among which there is one global maximum power point (GMPP). Several GMPP tracking methods employed in the literature have focused mainly on the tracking efficiency. But, the PV system output has to include the DC-DC converter losses also to get the actual estimate of the power extracted. Hence, this paper attempts to analyze the losses incurred in the DCDC converters namely conventional boost converter (CBC) and three-level boost converter (TLBC) connected to a PV array. It is observed that the efficiency of converters depends on the location of GMPP in the (P-V) curve. Further, the impact of switching frequency on the losses of aforementioned two topologies is discussed. A detailed comparison of the loss analysis performed with simulation results obtained from MATLAB/Simulink is provided. © 2022 IEEE.Item Power control of PV/fuel cell/supercapacitor hybrid system for stand-alone applications(International Journal of Renewable Energy Research, 2016) Sabhahit, N.S.; Gaonkar, D.N.; Nempu, P.B.This paper presents modeling and control of photovoltaic/fuel cell/supercapacitor hybrid power system for stand-alone applications. The hybrid power system uses solar photovoltaic array and fuel cell as the main sources. These sources share their power effectively to meet the load demand. The supercapacitor bank is used to supply or absorb the power during load transients. The main control system comprises of controller for maximum power tracking from photovoltaic system, a DC-DC boost converter with controller for fuel cell system for power management and inverter controller to regulate voltage and frequency. The stand-alone hybrid system aims to provide quality power supply to the consumers with a constant voltage and frequency along with proper power management using simple control techniques. The modeling and control strategies of the hybrid system are realized in MATLAB/Simulink.Item Design and implementation of single phase inverter based on Cuk converter for PV system(International Journal of Renewable Energy Research, 2017) Sabhahit, N.S.; Gaonkar, D.N.; Anandh, N.; Kumar, N.S.In this paper, analysis and hardware implementation of a single phase inverter based on Cuk converter for PV system is presented. The buck-boost characteristic of such a converter promotes flexibility for both grid tied as well as standalone connections where the ac voltage is either higher than or lesser than the dc input voltage. Further Cuk based topologies have the better efficiency and voltage regulation, which is a lacking feature in a basic boost or a buck configuration. The proposed system not only offers continuous input and output current but also controlled voltage over a wider range. Hence this topology can serve as an expedient alternative converter stage for photovoltaic applications. In the proposed bidirectional two-switch Cuk converter, DSPIC30F2010 controller is used for controlling the duty ratio of switching pulses. Also, this controller generates PWM signals for the switches of single phase H-bridge inverter. The hardware results for the developed prototype of a Cuk converter based single phase inverter are presented. The developed scheme can easily be scalable to a much larger rating of the PV system.Item Five-Level Switched Capacitor Inverter for Photovoltaic Applications(Taylor and Francis Ltd., 2022) Singh, A.K.; Mandal, R.K.; Raushan, R.; Anand, R.This paper proposes a switched-capacitor based single-phase five-level inverter configuration that operates under boost operation and generates a voltage that is more than the DC source voltage. The proposed five-level inverter uses a capacitor and boots the output voltage. In this proposed inverter, capacitor gets charged in parallel while it discharges in series connections so that output voltage may attain higher magnitude than the DC source voltage. Sinusoidal Pulse Width Modulation-based techniques are considered to produce the required gate pulses for operating the switching devices of the inverter. The five-level switched-capacitor inverter is combined with the PV system via DC–DC boost converters to extract the maximum power using MPPT algorithm. To verify its capability, the PV-based system is further integrated to the utility grid. The operation and performance of the suggested switched-capacitor inverter coupled with the grid-connected PV system are also analyzed by developing its model in MATLAB/Simulink environment. © 2022 IETE.Item Non-Isolated Power Factor Corrected AC/DC Converter with High Step-Down Voltage Ratio for Low-Power Applications(Hindawi Limited, 2022) Annambhotla, L.T.S.; Parthiban, P.This paper proposes a high step-down ratio AC-DC converter employing a quadratic buck converter with power factor correction. Conventional active power factor correction topologies employ boost-based correction schemes for unity power factor operation. This will require a steeper step-down ratio and higher switch voltage stress apart from complexity in the control scheme with sensors. The structure of the proposed topology is developed by combining the power factor correction stage with a high step-down stage. The passive input filter is split up into two for the purpose of reducing the thermal heating apart from offering a higher power factor. A single switch operation reduces the complexity of the control scheme. In addition, the number of conducting devices during the current path is also the same as the conventional buck converter due to cascading and hence offers lower conduction losses. The need for the converter to operate at an extremely low duty cycle is reduced due to the quadratic stage structure. The proposed converter operates at a moderate duty cycle, offering higher step-down voltage apart from reducing filtering requirements. MATLAB R2020b is used for carrying out simulation studies. Xilinx FPGA-based controller using system generator is implemented for the generation of pulses of appropriate duty cycle. Simulation and experimental results for a 150 W prototype are presented. An investigation and comparative evaluation of the conventional bridgeless buck system with the quadratic buck converter are carried out. The proposed structure offers the benefit of a higher step-down voltage ratio incorporating an inherent power factor correction stage along with the AC/DC stage. © 2022 Lalitha T. S. Annambhotla and P. Parthiban.Item A Two-Stage Module Based Cell-to-Cell Active Balancing Circuit for Series Connected Lithium-Ion Battery Packs(Institute of Electrical and Electronics Engineers Inc., 2023) Manjunath, K.; Kalpana, R.; Singh, B.; Kiran, R.This article addresses a two-stage module based cell-to-cell active equalization topology based on a modified buck-boost converter for series connected Lithium-ion battery packs. In the proposed topology, initially module based equalizing currents are controlled. Subsequently, cell-based equalizers are controlled in parallel within each battery module. The proposed topology significantly reduces the balancing time by transferring higher balancing current from a strong cell to the weakest cell in a module directly. With the proposed topology's modularized design, reduces voltage stress on long strings of switches, resulting in improved performance with fewer components. The operating principle, control strategy and design constraints are analyzed in detail. The MATLAB/Simulink platform is utilized to demonstrate the feasibility of the proposed technique for balancing the energy in series connected battery cells. To reduce the complexity of the control approach, the digital control is implemented using an FPGA control board. Further, a laboratory prototype is developed to show the feasibility and operability of the proposed topology. © 1986-2012 IEEE.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 Single-Phase Six-Switch Four-Port Boost Inverter With Active Power Decoupling(Institute of Electrical and Electronics Engineers Inc., 2024) Ramanarayana Reddy, M.; Dastagiri Reddy, B.; Prabhakaran, P.; Kishan, D.This letter proposes a novel single-phase six-switch four-port boost inverter with active power decoupling (6S4PwA). The four ports are two dc ports, an ac port, and a ripple port that acts as an active power decoupling (APD) circuit. A novel hybrid modified sinusoidal pulsewidth modulation (HMSPWM) scheme is proposed to operate the 6S4PwA. The proposed topology along with the HMSPWM scheme achieves high voltage gains at both the dc and ac ports and also eliminates the double-frequency ripple at dc ports. The ac film capacitor employed at the ripple port absorbs the 2ω ripple component, thereby eliminating dc-link voltage and inductor current ripples at two dc ports. Hence, the size of the dc-link capacitor and inductor at dc ports is reduced significantly. Overall, the proposed topology employs fewer components for four ports and reduces the size of passive elements, resulting in improved power density and reduced cost. To evaluate the performance of the proposed topology, a 500-W prototype is fabricated and tested. The experimental results show that the converter attains boost, inverter, and APD operations in a single stage and also improves power quality at the ac port. © 1986-2012 IEEE.