Faculty Publications
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Publications by NITK Faculty
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Item A Global Maximum Power Point Tracking Technique of Partially Shaded Photovoltaic Systems for Constant Voltage Applications(Institute of Electrical and Electronics Engineers Inc., 2019) Goud, J.S.; Kalpana, R.; Singh, B.; Kumar, S.The P-V characteristics of photovoltaic (PV) array exhibit several maximum power points (MPP) during non-uniform insolation (i.e., during partial shading) conditions; there exists only one global MPP (GMPP), whereas others are referred to local MPP. This paper presents a technique to track the GMPP for the constant voltage or battery loads during partial shading conditions using a single sensor connected to the battery terminals. The proposed method introduces fast and efficient scanning based method, i.e., scanning Ibatt-D curve of power electronic interface at selective duty cycles to recognize the kind of the solar shading pattern (i.e., kind of P-V curve) on PV array and to find the GMPP neighborhood. Moreover, the proposed method overcomes the drawbacks of existing methods such as low convergence speed, increased number of sensors, and heavy computational complexity. The proposed GMPPT method is simulated in MATLAB/Simulink and validated through test results on a prototype for various non-uniform insolation conditions. The results have shown that this paper tracks the GMPP with best tracking efficiency and fast tracking speed. Further, the proposed method is compared with two P-V curve scanning based GMPPT methods and one global optimization based artificial bee colony method. © 2018 IEEE.Item Optimal configuration for improved system performance of droop-controlled DC microgrid with distributed energy resources and storage(Elsevier Ltd, 2024) Mathew, D.; Prabhakaran, P.The placement of sources and loads in DC microgrids (DCMGs) influences the system's voltage regulation, span, and losses. In order to minimize losses and enhance voltage regulation, a unique algorithm for configuring a radial DCMG under droop control in an optimal way is presented in this paper. The suggested approach solves the optimal design problem by applying the power flow analysis technique. The genetic algorithm (GA), a heuristic method, is used to determine the ideal configuration because of the complexity of the optimization problem. An improved particle swarm optimization (IPSO)-based technique is also proposed for resolving the optimization issue to improve the convergence rate and computing efficiency. Appropriate modifications are proposed to yield an optimal configuration that results in the maximum achievable span for the radial, droop-controlled DCMG. To limit the bus voltage variations within the bounds, the objective functions of the optimization problem are appropriately formulated. In addition, the proposed algorithm is used to find the best position and power rating of a new distributed energy resource (DER) or load in the DCMG, in order to reduce system losses. A 5-bus, 500 W, radial, droop-controlled DCMG system's comprehensive numerical and simulation results are presented to validate the effectiveness of the proposed approaches. The findings are significant and useful for DCMG consumers as well as system designers. © 2024 Elsevier LtdItem Field analysis of directionality measurement with inverter based resources in India(John Wiley and Sons Inc, 2025) Shyamaprasad, A.; Vittal, K.P.; Praveen, A.N.; Naidu, O.D.Renewable energy sources are getting integrated into the electrical power network since many years. The characteristics of these sources are completely different from traditional synchronous generators. This is posing challenges for power engineers from system protection and control perspective. Cases of maloperations of protective relays have been a focus of research across industries and universities. India has been growing in deploying distributed energy resources. Most of the maloperations reported relate to transmission line protection. Studies on maloperation of directional element are not duly addressed from Indian grid perspective. Few cases from India have been chosen for research. Fault data from Type-4 and Type-3 wind plant and solar park has been analysed and compared with literature reports. The objective of this paper is to document the behaviour of directional elements for a distributed energy resource connected system in India. In addition, aim is to understand the gaps from existing research to the behaviours of the current directional protections. This would help in identifying mechanisms to ascertain directionality for similar systems in the future. The conclusion from the paper is that the detection of fault direction must be completed before the time inverter control kicks in to operation in any algorithm. © 2025 The Author(s). IET Generation, Transmission & Distribution published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.