Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Intelligent approach for efficient operation of electrical distribution automation systems(2003) Manjunatha Sharma, K.; Sreedhar, P.N.The distribution systems play a vital role in making efficient service in terms of power quality, reliability, and economy. The distribution network reconfiguration can be used for planning as well as real time control. This paper presents an efficient approach for network reconfiguration approach based on artificial neural networks. A package "DISTFLOW" is developed adopting the proposed technique. The off-line simulation results and daily load curve data are used for training of the neural network. Further the distribution system operation is optimized by selecting optimum compensation level computed by Genetic Algorithms (G.A). The proposed integrated approach is applied to 140 bus practical system of Surathkal city subdivision, of the power utility Mangalore electricity supply company (MESCOM).Item Investigations on Combined Operation of Industrial Distribution System and utility in Distributed Generation Environment(2006) Manjunatha Sharma, K.; Vittal, K.P.; Nagaraja Rao, T.K.The deregulation regime has given lot of scope for independent power producers to feed power to the utility nearest to the load center. This feature provides opportunities for lot of improvements in distribution system operation. In this paper investigations have been done for integrated operation of the practical MRPL industrial distribution plant having its own captive generation to act as distributed generation source serving neighboring utility loads. The performance of the system is simulated in both cases of industry acting as source and sink depending on the load cycle. The simulation results will serve as useful tool for decision making in power trading during ABT regime. ©2006 IEEE.Item Harmonic current compensation improvement at point of common coupling using hybrid natural green sources(Institute of Electrical and Electronics Engineers Inc., 2017) Nagaraj, C.; Manjunatha Sharma, K.Ideally, distribution utilities are responsible to provide good power at a fixed rated frequency to the consumer end at unity power factor. Due to the bulk usage of non-linear power electronic loads, distribution system network (DSN) suffers large current distortion. Further, the intermittent hybrid natural green sources (HNGS) like PV and PMSG wind grid connected using hysteresis current controller (HCC) through 3-phase VSI effects more distortion of current which contaminates the power quality at the consumer end. Thus power quality is a vital issue which needs to be presented well in this paper. This paper adopts the shunt active filter (SHAF) using real and reactive current (id-iq) control strategy to analyze the case studies with presence and absence of HNGS under unbalanced nonlinear load condition for the reduction in current distortion at distribution utility side. The MATLAB/Simulink examined to validate the performance of id-iq control strategy. © 2017 IEEE.Item Performance analysis of three leg DSTATCOM under distributed generation and fault scenario(Institute of Electrical and Electronics Engineers Inc., 2017) Saralaya, S.; Manjunatha Sharma, K.In modern power distribution system, use of nonlinear loads has increased drastically. Due to these nonlinear loads, power quality of the system is decreasing. Hence there is necessity of improving power quality of the system. Distribution Static Compensator (DSTATCOM) is a shunt connected custom power device, used in distribution system for performance improvement. DSTATCOM will maintain constant voltage at load terminals and maintains the shape of current and voltage by reducing the distortions. This paper presents a case study on investigation of performance of DSTATCOM at different operating scenarios. IEEE 13 bus industrial system is used to study the performance of three leg DSTATCOM. Voltage control mode with PI control is used to control RMS voltage at point of common coupling (PCC). © 2017 IEEE.Item Performance Analysis of Adaptive Speed Reference Tracking QFT Robust Controller for Three Phase Grid connected Wind Turbine under Stochastic Wind Speed Conditions(Institute of Electrical and Electronics Engineers Inc., 2021) Gudimindla, H.; Manjunatha Sharma, K.; Sandhya, S.Due to stochastic nature of wind, stator current harmonics arise in PMSG based wind energy conversion system that causes the oscillations in wind turbine shaft. These oscillations shows adverse effect on lifespan of wind turbine. It is desirable to track the speed reference in grid connected variable speed wind system along with the maximum power extraction. In this sense, this paper presents the robust controller design methodology to achieve the reference speed tracking controller with maximum power extraction capability in variable speed PMSG driven wind turbines. Further, A modified fitness function is introduced to design the automated robust controller using Genetic algorithm in quantitative feedback theory framework. MATLAB simulations are performed on 20 kW three phase grid connected wind system to analyse the dynamic performance of proposed robust controller under step variation and stochastic wind speed conditions. It is evident from the simulations that tracking of reference speed is achieved with proposed controller under power injecting to load and power sharing with grid conditions. © 2021 IEEE.Item Optimal Sizing, Placement and Performance Analysis of DSTATCOM with Improved Controller without Current Sensors(Institute of Electrical and Electronics Engineers Inc., 2021) Saralaya, S.; Manjunatha Sharma, K.The performance analysis of Distribution Static Compensator (DSTATCOM), when it is placed in an optimized location with an improved controller without current sensors is presented in this paper. To obtain optimal location, Ant colony optimization technique is used for the placement of DSTATCOM. To incorporate this compensator in load flow analysis, the modelling is done and rating of DSTATCOM is obtained. The performance analysis of improved controller is presented after placing the DSTACOM in optimized location with optimized size. The actual voltage at bus where DSTATCOM is placed and DC voltage of the converter is taken as control parameters. The proposed optimization placement technique is tested for 207 bus practical distribution system using MATLAB. The performance analysis of studied systems with controller for different operating scenarios such as sag, swell are investigated in MATLAB/SIMULINK software environment. © 2021 IEEE.Item Performance analysis of Grid Integrated Hybrid Renewable Energy System configuration application to Residential Buildings(Institute of Electrical and Electronics Engineers Inc., 2021) Gudimindla, H.; Manjunatha Sharma, K.; Sandhya, S.Recent technological advancements and cost reduction drives increasing the penetration of renewable energy sources with grid. Utilisation factor of renewable energy sources is low due to dependency on the environmental conditions. Basically, hybrid energy systems provide constant, high-quality power for the remote communities. The sizing of the hybrid system is significant to meet the load demand of residential buildings. In this paper, A simple optimal sizing algorithm is used to model the Wind turbine and PV system to meet the residential load. Quantitave feedback theory (QFT) based robust controller is implemented for the proposed sub-module integrated PV converter and the PMSG based wind energy conversion system to extract maximum power using simple genetic algorithm. Performance of the QFT controller is analysed through MATLAB simulations under varying irradiance and wind conditions. © 2021 IEEE.