Power quality issues have been a source of major concern in recent years due to extensive use of power electronic devices and non-linear loads in electrical power system and consequently sensitive detection and accurate classification of power disturbances have become very much necessary.
S-transform provides frequency dependent resolution that simultaneously localizes the real and imaginary spectra. The S-Transform is similar to wavelet transform but with a phase correction. This property is used to obtain useful features of the nonstationary signals that make the pattern recognition much simpler in comparison to the wavelet analysis. Features obtained from S-transform are distinct and understandable. According to rule based decision tree, five disturbance and two complex power disturbances are well recognized and classified.
S-Transform to Monitor Project Report