Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Kumar, A.S.

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    Combined model of fuel cell and microturbine based distributed generation system
    (2011) Nayak, S.K.; Gaonkar, D.N.; Kumar, A.S.
    Distributed Generation (DG) play an active role in the distribution network due to its minimum loss, maximum efficiency and environmental impact. Moreover DG can supply base load power which improves the system stability, reliability and power quality. Among the different combined DG systems like solar with wind, tidal with geothermal and others, fuel cell with microturbine is the most economical due to fuel flexibility and inner relation between each other. The hybrid system can utilize exhaust fuel and heat from fuel cell to increase the system efficiency. This paper investigates combined model solid oxide fuel cell/microturbine generator (SOFC/MTG) hybrid system, in which the anode exhaust of SOFC contains reminder of fuel. The exhaust hot gas and waste fuel are mixed with fresh fuel and compressed air is burned inside the burner. The pressurized hot gas from the combustor is expanded through turbine driving the Permanent Magnet Synchronous Machine (PMSM). The governing schemes of combined SOFC/MTG (Fuel & air flow) are controlled by the DC link voltage and current. The generated power of MTG is converted to AC/DC/AC to combine with fuel cell and frequency conversion. The hybrid model of SOFC/MTG with power converter is developed in MATLAB/Simulink library and simulation result shows transient response of hybrid SOFC/MTG DG system. © 2011 IEEE.
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    Performance study of grid connected fuel cell based distributed generation system with ultracapacitor
    (2011) Kumar, A.S.; Gaonkar, D.N.; Nayak, S.K.
    Fuel cell based power generation is becoming one of the promising distributed generation system Fuel cell system can generate power as long as fuel is supplied However fuel cells cannot respond quickly to sudden load change due to slow dynamic response. Hence energy storage system is required during transient period In this paper a grid connected fuel cell system performance is studied considering the ultracapacitor as energy storage device. To interface ultracapacitor with fuel cell bidirectional converter is used Simulation results presented here show that the bidirectional converter effectively controls power flow from ultracapacitor. The dynamic responses of the fuel cell system under different load conditions are presented The results presented in this paper demonstrate the load transient mitigation capability of ultracapcitor. © 2011 IEEE.
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    Performance analysis of variable speed wind energy conversion system in grid connected mode
    (2012) Kumar, A.S.; Gaonkar, D.N.
    This paper represents the modeling and simulation of wind energy based grid connected distributed generation system. A control scheme is presented to control the power flow of the inverter. The controller is able to restore the pre fault condition very quickly. The grid side controller is able to manage the constant dc-link voltage while maintaining the power injection according to the wind speed variations. The performance of the system for wide range of wind speed is presented. The battery is considered for energy storage and is directly connected to the dc-link. The results for variation in load and fault conditions are shown. © 2012 IEEE.
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    Performance of wind system with battery-UC in grid connected mode
    (Institute of Electrical and Electronics Engineers Inc., 2017) Kumar, A.S.; Gaonkar, D.N.
    In this paper the performance analysis of wind system connected to grid along with battery and Ultracapacitor (UC) is presented. The variation in battery discharge rate for varying wind speed has been shown. The battery-UC combination is used to smooth wind power output and to control battery discharge rate. The control schemes are employed for controlling and operating the wind based power generation system with storage in grid connected mode. The system performance for different wind speeds, load change is given. The charging of battery and ultracapacitor using wind power is presented. The dispatchable ability of wind system with storage is shown in this work. The power sharing between grid and inverter is also shown with simulation results. © 2016 IEEE.
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    Implementation of Enhanced Parallel port interface for Frequency analysis in a configurable Ring Oscillator PUF circuits on Xilinx Spartan 3E architecture
    (Institute of Electrical and Electronics Engineers Inc., 2019) Jeeru, D.R.; Vittal, K.P.; Anikethan, H.V.U.; Kumar, A.S.
    Hardware security has evolved from physical one-way functions to Physically Unclonable Functions (PUFs). A PUF produces a response for a given challenge by performing a functional operation. This paper demonstrates the Configurable Ring Oscillator (CRO) based PUF circuit with frequency meter. Frequencies are read through Enhanced Parallel Port (EPP) interface to enable efficient communication between the host and the Field Programmable Gate Array (FPGA) device. As a part of the work, 128 CROs are implemented on 128 Configurable Logic Blocks (CLBs) of the Spartan 3E FPGA device and frequencies are measured for every configuration of the CRO to generate the Challenge Response Pair (CRP) for each device. This experimental setup is carried out on 4 different FPGA devices and specific methodologies are used to generate responses which are consistent with time for every reading analyzed and different for different FPGA devices. The process involves selecting the optimum unit time pulse window to measure the frequencies of CROs and optimum number of CROs grouped as hard macro to enhance inter and intra Hamming Distance (HD) consequently improving uniqueness, reliability and uniformity metrics. © 2019 IEEE.