Detection of Transmission Line Faults in the Presence of Solar PV System Using Stockwell's Transform

Solar PV system is one of the significant electrical power generation source that have been given focus in the electrical industry in recent years. With the solar PV system in distributed and transmission networks of the utility grid, the behaviour of the system is changed and these units have different effects on the system. One of the major impacts of these units is on the distributed power network protection. This paper presents a Stockwell Transform based approach for the detection of the power system faults in the presence of the solar PV power generation source. The fault detection and diagnosis problems are considered with various types of the power system faults. The voltage during the faulty event extracted and decomposed using Stockwell Transform based multi-resolution to detect and discriminate the power system faults such as line to ground (LG), double line (LL), double to ground (LLG) and three-phase fault involving ground (LLLG). The results have been validated in MAT LAB/Simulink environment.