Fault Detection in DC Microgrids Using Short-Time Fourier Transform

Ivan Grcić, Hrvoje Pandžić and Damir Novosel
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Ivan Grcić: Faculty of Electrical Engineering and Computing, University of Zagreb, 10000 Zagreb, Croatia
Hrvoje Pandžić: Faculty of Electrical Engineering and Computing, University of Zagreb, 10000 Zagreb, Croatia
Damir Novosel: Quanta Technology, Raleigh, NC 27607, USA

Energies, 2021, vol. 14, issue 2, 1-14

Abstract: Fault detection in microgrids presents a strong technical challenge due to the dynamic operating conditions. Changing the power generation and load impacts the current magnitude and direction, which has an adverse effect on the microgrid protection scheme. To address this problem, this paper addresses a field-transform-based fault detection method immune to the microgrid conditions. The faults are simulated via a Matlab/Simulink model of the grid-connected photovoltaics-based DC microgrid with battery energy storage. Short-time Fourier transform is applied to the fault time signal to obtain a frequency spectrum. Selected spectrum features are then provided to a number of intelligent classifiers. The classifiers’ scores were evaluated using the F1-score metric. Most classifiers proved to be reliable as their performance score was above 90%.

Keywords: short-time Fourier transform; intelligent classifiers; microgrid; fault detection; machine learning (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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