Location of fault on UPFC based transmission lines using sparse S-Transform

This paper presents a new fault location algorithm for a transmission line operating with a Unified Power Flow Controller (UPFC). The proposed algorithm is based on a new matrix version of the conventional S-Transform, Sparse S-Transform (SST), using selected frequency components to increase the speed of the computation significantly. A variety of faults are initiated before and after the location of UPFC on the transmission line using MATLAB/SIMULINK platform. The location of fault is estimated using SST with significant accuracies. The computational speed of the SST is almost 30 times faster than the conventional discrete S-Transform which makes it a suitable candidate for real-time application in digital relaying.