Faculty Publications

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Author: search.filters.author.Gaonkar, D.N.Subject: search.filters.subject.Battery

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    Battery-ultracapacitor storage devices to mitigate power fluctuations for grid connected PV system
    (Institute of Electrical and Electronics Engineers Inc., 2016) Sabhahit, N.S.; Gaonkar, D.N.; Jhunjhunwala, J.V.; Karthik, R.P.
    This paper presents a control strategy based on energy storage systems to minimize the output power fluctuations for a PV system. Solar energy is naturally intermittent with stochastic fluctuations, by virtue of which, stability and power quality of grid operation are affected. This makes grid integration of PV system cumbersome. The aim of this study is to develop a control strategy to deliver smoothened power to the grid, using battery and ultracapacitors for a grid connected hybrid system. The fluctuating power is absorbed by a battery and ultracapacitors during erratic solar power variation, thus being able to mitigate the power fluctuations to the grid. Bidirectional converters are used in tandem with a battery and ultracapacitors to ensure active energy flow between the grid and the storage systems. The inverter control strategy is implemented such that it will maintain a constant DC link voltage. The PV power system is controlled to extract maximum power. Dynamic modeling and simulation study are accomplished using MATLAB/Simulink. © 2015 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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    A Hybrid Islanding Detection Method Based on Lissajous Pattern Having Robust Performance Under Various Power Quality Scenarios
    (Institute of Electrical and Electronics Engineers Inc., 2023) Mondal, S.; Gayen, P.K.; Gaonkar, D.N.
    A fast, accurate, robust, and two-staged islanding detection technique (IDT) is proposed. It is the hybridization of second-order general integrator-frequency locked loop (SOGI-FLL), Lissajous pattern (LP), and active power absorption-cum-reactive power injection via dc-bus connected battery unit-based inverter. The LP is used to identify islanding condition on the basis of frequency variation of fundamental voltage. Here, the measured ac voltage signal is preprocessed by SOGI-FLL to obtain fundamental bus voltage under various power quality scenarios. This assures robust islanding detection by removing uncertainty, and thus, reliability is improved. The uncertainty effects due to the partial shading condition of the PV module (source-side disturbance) and weak grid-connected condition are avoided by dc-bus connected battery storage unit. Thus, it removes above-said limitations of the existing scheme. The LP-based detection within the nondetection zone is expedited due to active and reactive powers variation via controlling of the inverter and charging operation of the dc-bus connected battery unit. During the reactive power injection by solar inverter, active power is absorbed by dc-bus connected battery unit. In effect, an active power output of the inverter is reduced. Here, the reactive power injection at the reduced active power output condition of the inverter accelerates frequency variation allowing rapid islanding detection. The real-time experiments are carried out using Typhoon-HIL tools to compare the proposed method with other works reported in the literature. Improved performances under diversified scenarios are found in the proposed case. © 2007-2012 IEEE.