Faculty Publications
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Publications by NITK Faculty
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Item A novel technique for photovoltaic maximum power pointtracking system(2005) Shantharama Rai, C.; Udaya Kumar, R.Y.; Naik, R.L.Maximum power point tracking (MPPT),used in photovoltaic(PV) systems to maximize the photovoltaic array output power, irrespective of the temperature and irradiation conditions and of the load characteristics. In this paper a new MPPT system has been proposed consists of newly developed flyback type converter of a flyback transformer for high frequency linkage and synchronous switches for the connection to the AC utility grid and a maximum power point tracking (MPPT) controller without a current sensor. In this project the generated power of the PV array can be calculated by the equation using the voltage of PV array. The proposed PV power system which consists of two or more inverters, can get large power than the conventional one, when the PV array is partially shaded by some constructions.Item Regulating frequency of supply voltage using matrix converter and comparative evaluation with double end converter(Institute of Electrical and Electronics Engineers Inc., 2017) Kundu, A.; Vittal, K.P.This paper attempts to present the devising of the Matrix converter and an AC-DC-AC converter along with their working principle and control mechanisms. Both of these converters are AC-AC converters and are primarily used in cases where frequency of the out-put AC signal needs to be regulated with respect to the input. The principle of superposition is used by the matrix converter and is deployed to provide a bidirectional power flow. This also aims to eliminate the need for large DC link capacitors. Subsequently, the control algorithm is more complex. An AC-DC-AC converter on the other hand engages switched mode power conversion to first convert the input AC power to DC and then convert it back to AC using a PWM inverter. We also aim at understanding the applications of both the converters with respect to their performance under various conditions. © 2016 IEEE.Item Architectural framework of on-board integrator: An interface for grid connected EV(Institute of Electrical and Electronics Engineers Inc., 2017) Hampannavar, S.; Likassa, K.; Ayenew, E.; Sandeep, N.; Yaragatti, U.R.Vehicle to Grid (V2G) is the concept of connecting a group of electric vehicles (EV) to the grid for power transaction. EVs can be connected to the grid through the home interface or through the chargers available at charging stations. In this paper, a single phase on-board charger with low complexity control scheme is proposed for EV power transaction. The power flow from and to the grid is processed using two stage cascaded converters consisting of a bidirectional DC-DC and DC-AC converters. The LCL filter is used as an interface between DC-AC converter and the grid to attenuate the grid current harmonics. A proportional resonant (PR) controller is employed for the control of grid current and to enable the unity power factor operation of the DC-AC converter. The setbacks associated with the conventional proportional-integral (PI) controller for single phase system is elevated by employing PR controller. Filter design guidelines and the control strategy developed for the proposed system is numerically simulated and verified with extensive simulation carried using MATLAB/SIMULINK. The results demonstrating the feasibility and viability of the proposed system are presented. © 2017 IEEE.Item Design of a New Single-Phase 15-Level Inverter with Minimized Components(Institute of Electrical and Electronics Engineers Inc., 2023) Nageswar Rao, B.N.; Yellasiri, Y.; Shiva Naik, B.S.; Aditya, K.; Karunakaran, E.; Kumar, M.V.Multilevel inverters (MLI) provide a number of challenges, the most significant of which is the requirement for a high number of power semiconductors and separate dc supplies to assimilate renewable energy into a grid successfully. Because of this, reducing the number of components used in these kinds of inverters is quite important. Because transformer-based multilevel inverters (TBMIs) have become more commonplace, the use of many dc supplies in the cascaded inverter is no longer necessary for the device to function. Based on the outcomes of this study, a new transformer-based MLI with fifteen levels (15L) and eight switches can be built with only one dc source required. The suggested MLI consists of three isolated transformers. The suggested MLI structure has many unique benefits, including the use of fewer switching components and the availability of self-galvanic isolation. The MATLAB simulation results are carried out to evaluate the effectiveness of the suggested TBMLI. In addition, a comparison of the suggested structure to other recent configurations is presented. © 2023 IEEE.Item Autonomous Microgrid Using New Perspective on Droop Control in AC Microgrid(Springer Science and Business Media Deutschland GmbH, 2024) Siddaraj, U.; Yaragatti, U.R.; Nagendrappa, H.Providing higher quality power to consumers through the existent microgrid is now a problem for the renewable energy source. Designing a droop controller for the microgrid is a necessity to construct a dependable and effective microgrid. In this paper, a P–F/Q–V droop method is used to connect several VSIs in parallel. Their parallels and differences are amply discussed in this study. A frequency droop control method and a virtual impedance approach are combined in the suggested method, which is coupled to two distributed generation (DG) local controllers and has each unit having a droop control and a voltage-current controller. An islanded system's load flexibility and microgrid reliability can both be enhanced by adding this controller. The microgrid was subjected to this idea without any real-time communication. Simulink/MATLAB was used to simulate this. The results obtained show that the microgrid (MG) model is effective in autonomous operation. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.Item Dynamic voltage restorer (DVR) –areview(River Publishers editor@jgenng.com, 2018) Remya, V.K.; Parthiban, P.; Ansal, V.; Babu, B.Power quality (PQ) is gaining a great deal of importance as more sensitive loads are introduced into the utility grid. The degradation of product quality, damage of equipment and temporary shutdowns are the general issues associated with PQ problems in industries. Any mal-operation or damage of the industrial sensitive loads results in monetary losses disproportionately higher than the severity of the PQ issues. The evolution of power electronics technology replaced the traditional power quality mitigation methods with the introduction of Custom Power System devices (CUPS). The major power electronic controller based CUPS are DSTATCOM, DVR and UPQC. DVR is a pertinent solution for the economic losses caused by the PQ issues in the industries. Among the CUPS, DVR is the most cost-effective one. In the published literature, only a few papers correspond to the review of DVR technology. In this paper, a systematic review of published literature is conducted and a description is given on the design, standards and challenges in the DVR technology. A detailed survey is conducted on the published literature to address the various aspects and issues in the DVR system. This paper arrangement gives the working principle, structure, various topologies, compensation techniques, voltage sag detection methods and control methods of the DVR under different sections. The section “Challenges faced by the DVR” included in the manuscript can be useful for the researchers beginning their work in the domain of DVR. The simulation results using the sim power system tool of MATLAB/Simulink software are provided for analysis and comparison. © 2018 the Author(s). All rights reserved.Item Critical review of PV grid-tied inverters(MDPI AG indexing@mdpi.com Postfach Basel CH-4005, 2019) Kavya Santhoshi, B.K.; Mohanasundaram, K.M.; Padmanaban, S.; Holm-Nielsen, J.B.; Koothu Kesavan, K.K.Solar Photovoltaic (PV) systems have been in use predominantly since the last decade. Inverter fed PV grid topologies are being used prominently to meet power requirements and to insert renewable forms of energy into power grids. At present, coping with growing electricity demands is a major challenge. This paper presents a detailed review of topological advancements in PV-Grid Tied Inverters along with the advantages, disadvantages and main features of each. The different types of inverters used in the literature in this context are presented. Reactive power is one of the ancillary services provided by PV. It is recommended that reactive power from the inverter to grid be injected for reactive power compensation in localized networks. This practice is being implemented in many countries, and researchers have been trying to find an optimal way of injecting reactive power into grids considering grid codes and requirements. Keeping in mind the importance of grid codes and standards, a review of grid integration, the popular configurations available in literature, Synchronization methods and standards is presented, citing the key features of each kind. For successful integration with a grid, coordination between the support devices used for reactive power compensation and their optimal reactive power capacity is important for stability in grid power. Hence, the most important and recommended intelligent algorithms for the optimization and proper coordination are peer reviewed and presented. Thus, an overview of Solar PV energy-fed inverters connected to the grid is presented in this paper, which can serve as a guide for researchers and policymakers. © 2019 by the authors.Item A New Single-Source Nine-Level Quadruple Boost Inverter (NQBI) for PV Application(Institute of Electrical and Electronics Engineers Inc., 2022) Singh, A.K.; Raushan, R.; Mandal, R.K.; Ahmad, M.W.Multi-level inverters (MLIs) with switched capacitors are becoming popular due to their utilization in AC high-voltage applications as well as in the field of renewable energy. To achieve the required magnitude of output voltage, the switched capacitor (SC) technique employs a lesser number of DC sources in accordance with the voltage across the capacitor. Designing an efficient high-gain MLI with fewer sources and switches needs a rigorous effort. This paper introduces a prototype of a nine-level quadruple boost inverter (NQBI) topology powered by one solar photo-voltaic source using fewer capacitors, switches, and diodes when compared to the other SC-MLIs topology. The suggested NQB inverter produces nine levels of voltage in its output by efficiently balancing the voltages of the two capacitors. The various SC-MLIs are compared in order to highlight the benefits and drawbacks of the proposed nine-level quadruple boost inverter (NQBI) topology. To validate the efficacy of the proposed solar photovoltaic based NQBI without grid connection, detailed experimental results are presented in a laboratory setting under various test conditions. © 2013 IEEE.Item A Hybrid Islanding Detection Method Based on Lissajous Pattern Having Robust Performance Under Various Power Quality Scenarios(Institute of Electrical and Electronics Engineers Inc., 2023) Mondal, S.; Gayen, P.K.; Gaonkar, D.N.A fast, accurate, robust, and two-staged islanding detection technique (IDT) is proposed. It is the hybridization of second-order general integrator-frequency locked loop (SOGI-FLL), Lissajous pattern (LP), and active power absorption-cum-reactive power injection via dc-bus connected battery unit-based inverter. The LP is used to identify islanding condition on the basis of frequency variation of fundamental voltage. Here, the measured ac voltage signal is preprocessed by SOGI-FLL to obtain fundamental bus voltage under various power quality scenarios. This assures robust islanding detection by removing uncertainty, and thus, reliability is improved. The uncertainty effects due to the partial shading condition of the PV module (source-side disturbance) and weak grid-connected condition are avoided by dc-bus connected battery storage unit. Thus, it removes above-said limitations of the existing scheme. The LP-based detection within the nondetection zone is expedited due to active and reactive powers variation via controlling of the inverter and charging operation of the dc-bus connected battery unit. During the reactive power injection by solar inverter, active power is absorbed by dc-bus connected battery unit. In effect, an active power output of the inverter is reduced. Here, the reactive power injection at the reduced active power output condition of the inverter accelerates frequency variation allowing rapid islanding detection. The real-time experiments are carried out using Typhoon-HIL tools to compare the proposed method with other works reported in the literature. Improved performances under diversified scenarios are found in the proposed case. © 2007-2012 IEEE.Item A Novel Quadruple Boost Inverter With New Optimized Fuzzy-Based Switching Scheme(Institute of Electrical and Electronics Engineers Inc., 2024) Aditya, K.; Yellasiri, Y.; Shiva Naik, B.S.; Nageswar Rao, B.N.; Panda, A.K.This brief proposes a novel quadruple boost nine-level inverter (QB-NLI) and an optimized switching pattern using fuzzy logic controller. The suggested method simplifies the traditional approach by removing the conventional logic gate circuit design. The pulse signal generator and lookup table are both derived using a fuzzy logic pulse generator. Fuzzy logic controller (FLC) and Controlled membership functions (MFs) rules open numerous prospects for generating pulses based on the input as modulation index. The suggested technique is examined on the proposed QB-NLI topology using the selective harmonic elimination PWM method. MFs are created based on averaging Newton Rapson and quantizer firing angles for diverse modulation index (mi) values. The proposed QB-NLI structure comprises ten switches with one dc-voltage source and two capacitors. The proposed structure's circuit description, modes of operation, proper component selection, and a new fuzzy-based switching scheme are presented. Further, a discussion about the comparative analysis of the proposed switching technique with other switching techniques concerning THD and RMS voltages is presented. In addition to the simulation results, experimental tests are conducted under various load conditions on the built-in hardware prototype to evaluate the proposed QB-NLI structure and switching technique. © 2023 IEEE.