Ground Fault Detection Using Hybrid Method in IT System LVDC Microgrid

Kyung-Min Lee and Chul-Won Park
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Kyung-Min Lee: Department of Electrical Engineering, Gangneung-Wonju National University, 150 Namwon Ro, Gangwon, Wonju 26403, Korea
Chul-Won Park: Department of Electrical Engineering, Gangneung-Wonju National University, 150 Namwon Ro, Gangwon, Wonju 26403, Korea

Energies, 2020, vol. 13, issue 10, 1-12

Abstract: Low voltage direct current (LVDC) microgrid systems have many advantages over low voltage alternating current (LVAC) systems. Furthermore, LVDC microgrids are growing in use because they are easy to link to distributed energy resources (DER) and energy storage systems (ESS), etc. Currently, IT system LVDC microgrids are widely used in direct current (DC) railways, hospitals, photovoltaic (PV) systems, and so on. When a ground fault occurs in an IT system LVDC microgrid, the ground fault may not be detected because the fault current is very small and there is no current path. In this paper, ground fault detection is proposed using a hybrid method that comprises pulsation signal generator injection and detailed coefficients of discrete wavelet transform (DWT). The LVDC microgrid was modeled and simulated using power systems computer-aided design (PSCAD). In addition, the proposed hybrid method was implemented using MATLAB’s wave menu, a script m-file, and the PSCAD library. The proper threshold was selected and tested by fault resistance change and load variation. In order to verify the superiority of the proposed hybrid method, a comparative study with the conventional method was performed. The results of various simulations show that the proposed hybrid detection method has normal operation and accurately and rapidly detects ground faults.

Keywords: detailed coefficient; DER; ESS; ground fault detection; hybrid method; LVDC microgrid; IT system; PSCAD (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: 2020
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