Sliding DFT-Based Fault Location Scheme for DC Microgrid

Nowadays, the dc microgrid is getting much more attention due to its numerous advantages. However, accurate and timely detection of a fault and its location is still challenging. This article proposes a fast and effective fault identification and localization scheme for dc microgrids. This article implements the dc component concept to detect and locate the fault. The sliding discrete Fourier transform technique is used for the computation of dc components. At the first stage, the fault is identified by noticing the change in the direction of both the end current signals. In the second stage, the fault point resistance is estimated. Finally, in the third stage, the location of the fault is determined. The proposed methodology is implemented in real-time on the LabVIEW platform. The testing is performed for different types of faults at various fault locations considering distant topologies of the dc microgrid.