Protection of DC Microgrids Based on Differential Protection Method by Fuzzy Systems

Abstract

Today, DC microgrids have gained attention due to their performance ability. The advantages of this type of microgrid over AC microgrids are fewer DC/AC and AC/DC conversion steps, easier control, reliability, and higher efficiency. One of the most important challenges that DC microgrids face is such systems protection. In this paper, a protection algorithm based on a differential protection method for a low voltage ring DC microgrid connected to the network is presenting. This protection method ought to able to quickly detect all types of pole-to-pole and pole-to-ground faults for high-impedance and low-impedance faults and prevent complete system shutdown. After detecting and isolating the fault, the fault place was determining using fuzzy logic and using voltage transients.