Conference Papers
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Item Improvement of harmonic current compensation for grid integrated PV and wind hybrid renewable energy system(Institute of Electrical and Electronics Engineers Inc., 2016) Nagaraj, C.; Manjunatha Sharma, K.M.Ideally, electric utilities are required to supply sinusoidal voltage at constant rated frequency while end users need to receive a sinusoidal current with good power factor. Electrical power distribution systems are already experiencing distortion of the current due to the usage of non-linear power electronic loads in industrial and commercial applications. Further, the integration of intermittent hybrid renewable sources like solar and wind to the utility grid through 4-leg 3-phase 4-wire current controlled voltage source inverter (VSI) leads to cause still more current distortion which pollutes the quality of electric power at the end users. Thus power quality is a critical issue to be addressed effectively. The active power filter (APF) is advantageous over passive filter due to its capability for better harmonic compensation features. This paper presents analysis of shunt active filter (SHAF) using a PI controller with and without the incorporation of intermittent hybrid renewable sources under different grid conditions. An instantaneous real and reactive current (id-iq) control scheme for SHAF is proposed for reduction in harmonic levels. The MATLAB/Simulink simulation studies validates the performance of id-iq control method. © 2016 IEEE.Item Performance analysis of robust and nonlinear MPPT controllers for autonomous wind power system(Institute of Electrical and Electronics Engineers Inc., 2017) Gudimindla, G.; Manjunatha Sharma, K.M.This paper presents the performance analysis of nonlinear and robust control strategies for the maximum power extraction from permanent magnet synchronous generator (PMSG) based autonomous wind energy conversion system (WECS) under varying wind speed. The Nonlinear control strategy aims to achieve improvement in speed tracking performance by using feedback linearization method used to select the optimal control input by compensating nonlinearities in the WECS directly driven by PMSG. In order to design the Robust Quantitative Feedback Theory (QFT) based controller and multi model QFT controller for the WECS based on PMSG, the nonlinear system is represented by a series of linear time invariant transfer functions around different operating points. Robust controllers are designed for proper selection of optimal control input to extract maximum power for every wind speed. Performance analysis is done from the MATLAB simulation results among the controllers for the PMSG based WECS. Multi model QFT controller is recommended for their enhanced performance. © 2016 IEEE.Item Investigation of performance of DSTATCOM with improved current sensorless controller(Institute of Electrical and Electronics Engineers Inc., 2018) Saralaya, S.; Manjunatha Sharma, K.M.The performance analysis of Distribution static compensator with a modified current sensorless controller which is designed for unbalanced load condition is presented in this paper. The investigation of the controller is performed with the presence of voltage sag and swell. To control terminal voltage and dc link, the proportional integral controller is used. The DSTATCOM is placed in IEEE 13 industrial system. The analysis is done in PSCAD/EMTDC package. © 2018 IEEE.Item Integration of hybrid solar-wind energy sources with utility grid for improving power quality(Institute of Electrical and Electronics Engineers Inc., 2018) Nagaraj, C.; Manjunatha Sharma, K.M.Most of the utilities are suffering to provide continues and clean power at the end users due to grid current distortion in the distribution system because of non-linear low power electronics loads. In addition to this, freely available inherent hybrid solar-wind energy sources are leads to cause some more grid current distortion. Adverting to the above major issue over long decade, this paper presents an efficient controller for 3-phase 4-leg interfacing voltage source inverter to perform not only current harmonic reduction but also optimal real power transfer, neutral current compensation and power factor correction simultaneously. These multiple functions can be achieved efficiently by using id-iq control based shunt active power filter. The hysteresis comparator control is used to compare the obtained reference currents from id-iq control with actual sensed actual currents to generate the error signal. This error signal decides the working of the inverter switches. The simulation is carried out by using MATLAB/SIMULINK tool under different grid and load conditions and the corresponding simulated results are encouraged. © 2018 IEEE.Item Performance analysis of automated quantitative feedback theory based robust controller for photovoltaic converter(Institute of Electrical and Electronics Engineers Inc., 2018) Gudimindla, H.; Manjunatha Sharma, K.M.Robust controller design for photovoltaicconverters (PVC) has received considerable critical attention due to solar panels operated under uncertain environmental circumstances. This paper presents automated loop-shaping based robust controller design for PVC voltage regulation with the aid of quantitative feedback theory (QFT) using Genetic algorithm. The step by step design guidelines for the automated QFT (AQFT) robust controller is deliberated in detail. The proposed AQFT controller exhibits decreasing modular plot, descending phase response and nearer to the universal bound to replicate the controller ideal characteristics. Finally, benchmarking of the proposed controller with affine parameterization design method available in the literature is performed through simulations. © 2018 IEEE.Item Design and Development of an Emulator for Distribution Automation Using DCS(Institute of Electrical and Electronics Engineers Inc., 2018) Hanumantha Rao, B.; Chandan Kumar, B.; Manjunatha Sharma, K.M.; Selvan, M.P.The distribution system in the power system network plays vibrant role in the delivery of electrical energy to the consumers. Automation in the field of distribution system empowers more flexible control for the utilities, which is effectively used to enhance the efficiency, power quality and reliability of electrical supply services. Presently, the advanced developments in the information and communication technologies and intelligent electronic devices make the distribution network operations more resilient, efficient, reliable and cost effective. This paper presents brief overview about the design and development of distribution system automation. This involves design of distribution substation model and provision of automation for it. Automation involves isolation of fault and restoration of the service, when a fault occurs in any one of the feeder. Load transfer between the feeders, between incomer and load scheduling, display of energy consumption of each feeder are a few functions of automation. © 2018 IEEE.Item A Novel PWM Technique for MPPT Tracking of PV-Based Cascaded H-bridge Multi-level Inverter(Institute of Electrical and Electronics Engineers Inc., 2023) Maheswari, G.; Manjunatha Sharma, K.M.; Prabhakaran, P.This paper presents a novel Pulse Width Modulation (PWM) technique designed for a Cascaded H-Bridge (CHB) grid-tied multilevel inverter used in Photovoltaic (PV) systems, featuring a single-stage power conversion. Each inverter's output voltage adopts a quasi-square waveform tailored to correspond with the power generated by the respective solar panel. A key highlight of this technique is its simplicity, avoiding complex implementation. By incorporating the proposed PWM technique into the cascaded H-Bridge inverters, it efficiently optimizes the Maximum Power Point Tracking (MPPT) for each PV panel, regardless of whether the irradiation conditions are uniform or non-uniform, while simultaneously achieving DC capacitor voltage balance. Moreover, employing this PWM technique simplifies the implementation process on a DSP, avoiding unnecessary complexity. © 2023 IEEE.Item Implementation of Sorted Stair-Case Modulation and Sorted Phase Disposition PWM for Grid-Tied Multi-Level Inverter(Institute of Electrical and Electronics Engineers Inc., 2023) Maheswari, G.; Manjunatha Sharma, K.M.; Prabhakaran, P.Integrating a multilevel inverter with the grid provides advantages in high-power and high-voltage applications, including reduced harmonic distortion without a transformer. This paper presents the implementation of Sorted stair-case modulation (SSCM) and Sorted Phase disposition (SPD) Pulse Width Modulation (PWM) techniques for a Grid-Tied Cascaded H-Bridge (CHB) multilevel inverter featuring single-stage power conversion. SSCM and SPD PWM techniques are used to track the MPPT of each PV panel under uniform and non-uniform irradiation conditions if the PV panels are connected to the inverter's input terminals. A centralized current controller has been designed for the Grid-tied multilevel inverter system. Furthermore, a simulation has been developed to compare the power quality of the grid current and voltage between SSCM and SPD-PWM. © 2023 IEEE.Item Implementation of a Novel Nine-Level Quadruple Boosting Inverter(Institute of Electrical and Electronics Engineers Inc., 2024) Maheswari, G.; Manjunatha Sharma, K.M.; Prabhakaran, P.This paper proposes a novel nine-level quadruple-boosting multilevel inverter (MLI) that uses a single DC source and requires only ten power switches, one diode, and three capacitors. This design utilizes switched capacitors (SC) with a common ground (CG), achieving a four-fold voltage boost without needing an extra boost converter. The common grounding mitigates leakage current, making the system more efficient. In this proposed topology, the capacitors are self-balanced. The proposed inverter topology offers several advantages compared to existing nine-level inverters, such as significantly reducing leakage current due to common ground configuration, boosting capability, and using fewer components. MATLAB Simulink simulations demonstrate the superior effectiveness of the proposed nine-level quadruple-boosting MLI. © 2024 IEEE.Item A Novel Five-Level Double-Boost Inverter with Reduced Spike Current(Institute of Electrical and Electronics Engineers Inc., 2024) Maheswari, G.; Manjunatha Sharma, K.M.; Prabhakaran, P.This paper proposes a novel five-level double-boosting multi-level inverter (MLI) that uses a single DC source and requires only six power switches, one diode, and one capacitor. This design enables soft charging of the capacitor by integrating a charging inductor, which helps minimize or completely avoid large inrush or spike currents in the charging pathway. In this proposed topology, the capacitor is self-balanced. The proposed inverter topology offers several advantages compared to existing five-level inverters, such as significantly reducing inrush current, boosting capability, lower total standing voltage (TSV), common ground configuration, higher efficiency, and using fewer components. MATLAB Simulink simulations demonstrate the superior effectiveness of the proposed five-level double-boosting MLI in terms of reducing spike current. © 2024 IEEE.