Abstract

Contrary to conventional AC systems, protection has been challenging for DC systems. In this paper, a novel fault detection method using a fuzzy logic is proposed for Low-Voltage DC (LVDC) microgrid. A fuzzy system makes the best and most appropriate decision on the basis of a number of specific rules and conditions for any state of the grid. The aim of this paper is fast fault detection in microgrids, regardless of the faults type and current magnitude as well as power supply's feeding capacity, by instantaneous current monitoring that faulted segment is isolated and the remaining system stays online. To do so, an LVDC ringbus microgrid is proposed that utilizes solid-state bidirectional switches with master and slave controllers.

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