Abstract
The use of distributed resources in the electric power system at the distribution level has opened new possibilities; among others, the overwhelming use of the DC microgrid in rural areas, electric vehicles, and ships. Most challenges associated with the DC microgrid in the protection system are related to ground fault. While low impedance ground fault can be detected through a high current surge, high impedance ground fault remains difficult due to a small current fault and a small reduction of the DC link voltage. The purpose of this project is to design a DC microgrid protection system capable of detecting and isolating ground faults impedance, both for a ring and radial bus configuration. To accomplish this goal, a new method has been developed for a DC ring bus while artificial neural network has been used for a DC radial bus configuration. Throughout the length of this document, their algorithms and performance will be discussed.