Detection of transmission line faults in the presence of solar PV generation using discrete wavelet

The relaying is an important aspect for the protection of transmission lines, generators, bus-bars, and transformers for reliable power system operation. The issue of protection has become critical due to increased grid integration of distributed energy sources. The relaying systems continuously monitor the voltage and currents in the power system and generate commands to isolate the faulty part of the network during the events of power system faults. These faults are common and more frequent in transmission and distribution systems. This paper presents an algorithm based on discrete wavelet transform (DWT) for the detection of power system faults in the presence of solar PV power generation system. The power system faults such as line to ground (LG), double line (LL), double line to ground (LLG) and three phase fault involving ground (LLLG) has been investigated. The current supplied by the solar PV system has been found to be key feature for the detection of power system faults. The study has been performed using a test system and results have been validated in MATLAB/Simulink environment.