Abstract:

A method of short duration power quality disturbance based on S-transform has been proposed. The data which has been extracted from the result of the S-transform, the S-complex matrix as well as the S-mode matrix, are used to analysis the amplitude of the voltage of the three-phase short-circuit fault dips, the phase transition duration and harmonic content. By analyzing simulation results, this method shows a good detection quality of the characteristics of three-phase short-circuit fault voltage dips.

Key words: power quality, short-term disturbance detection, three-phase short-circuit fault, voltage sag, S transform