Faculty Publications
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Publications by NITK Faculty
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Item A control strategy for power management in a PV-battery hybrid system with MPPT(Institute of Electrical and Electronics Engineers Inc., 2017) Sabhahit, J.N.; Gaonkar, D.N.; Adarsh, S.; Sunil, S.The paper presents a control strategy which manages the power flow between a Photovoltaic (PV) module, battery and the load. Since PV system provides an unregulated voltage output, it is regulated to a desired voltage level and then given to the charge controller, which distributes the power between battery and load. To extract acme power from PV system, a Maximum Power Point Tracking (MPPT) scheme is employed. The excess energy left, after meeting the load demand, is stored in the battery. The stored energy is utilized to meet the future load demands, when there is a power deficit from the PV system. Hence power requirement of the load is managed. Also a comparison between the three commonly used MPPT techniques: Perturb & Observe (P&O) algorithm, Incremental Conductance (IC) algorithm and Fractional Open Circuit Voltage (FOCV) algorithms is done and the most suitable technique is employed for the hybrid system. When the battery is fully charged, the excess power is absorbed by the dump load, which is also managed by the charge controller. The entire hybrid system is simulated and verified in the MATLAB/Simulink platform. © 2016 IEEE.Item Multiport Converters to Integrate Multiple Sources and Loads - A Review of Topologies(Institute of Electrical and Electronics Engineers Inc., 2018) Adarsh, S.; Nagendrappa, N.With the increase in penetration of variety of renewable energy resources in the grid, energy storage systems are needed to balance power flow and improve the reliability of the system. A compact multiport converter supporting bidirectional power flow is a suitable candidate to interface multiple sources and loads. This paper reviews various multiport converter topologies in the literature. The multiport converters can be classified as isolated, partially isolated and non isolated converters. The converter topologies in each category are identified and reviewed. Their benefits and drawbacks are highlighted. © 2018 IEEE.Item A Novel Dual Transformer Triple Active Bridge to Interface Renewable Energy Storage and Load(Institute of Electrical and Electronics Engineers Inc., 2023) Adarsh, S.; Nagendrappa, H.A novel topology of dual transformer triple active bridge is proposed for interfacing renewable energy storage system with the load. This topology uses series connection of dual transformers to reduce the circulating current and the number of semiconductor devices. Phase shift and duty ratio control are used to control the bidirectional power flow and regulate the load voltage. Duty ratio control also results in zero-voltage switching (ZVS) of all the converter switches for the entire input voltage and load range. The converter is designed to reduce switch stress. The simulation of a 1 kW converter is done to verify its performance for a variable load, supply voltage, and bi-directional power flow. From the results, it is found that the topology regulates the output voltage for variations both in supply voltage and load. In the duty ratio controlled topology, all switches turn on with ZVS for all operating cases. © 2023 IEEE.Item Duty ratio control ofthree port isolated bidirectional asymmetrical triple active bridge DC-DC converter(Institute of Advanced Engineering and Science, 2021) Adarsh, S.; Nagendrappa, N.Multiport converters are used in interfacing of distributed energy sources with grid/load. Isolated converters are needed in applications where converter gain is high and there is a requirement of isolation. Dual transformer asymmetric triple active bridge offers the advantage of reduced circulating current. However, the operating range is low for variation in load and source voltage. In this paper duty ratio modulation technique is proposed to regulate the load voltage and control the power flow in both the directions. As a result of the new gating scheme, the converter switches operate with ZVS, irrespective of variations in load power and source voltage. The converter is designed to ensure high switch utilization. The control technique is validatedthrough simulation of a 1kW three port DC-DC converter. It was observerd that the load voltage was regulated for wide range of variation in load power and source port voltages. The single input dual output mode was also verified. © 2021, Institute of Advanced Engineering and Science. All rights reserved.