Harmonic Content-Based Protection Method for Microgrids via 1-Dimensional Recursive Median Filtering Algorithm

Microgrids (MGs) offers grid-connected (GC) and islanded (ID) operational modes. However, these dynamic modes of operation pose different microgrid protection challenges. This paper presents a new method for MGs based on discrete one-dimensional recursive Median filter (1-DRMF). In the first step, 1-DRMF is applied measured current signal every single phase individually targeted feature extraction. Then, median deviation (MFD) selected harmonic distortion (SHD) are computed from signals all phases independently. second upsurges in MFD SHD cross-checked with pre-established threshold value 0.3 to identify categorize fault incidents. Finally, directional properties three-phase (3-p) reactive energy employed order pinpoint faulty line section (LS). Many simulations were executed MATLAB/Simulink validate sustainable performance established method. Results prove that scheme can detect, classify, locate solid high impedance faults (HIF) GC as well ID under radial meshed scenarios.