Wavelet based on-line disturbance detection for power quality applications

This paper introduces a new on-line voltage disturbance detection approach based on wavelet transform. The proposed approach (1) identifies voltage di sturbances, and (2) discriminates the type of event which has resulted in t he voltage disturbance, e.g, either a fault or a capacitor-switching incide nt. The proposed approach is (1) significantly faster and (2) more precise in discriminating the type of transient event than conventional voltage-bas ed disturbance detection approaches. Feasibility of the proposed disturbanc e detection approach is demonstrated based on digital time-domain simulatio n of a distribution power system using the PSCAD/EMTDC software package.