Classification of event and variation occurred in distribution system using S-transform

Recently, by increasing of devices which are sensitive to power quality, the deterioration of power quality has been accelerated. For this reason, the social and economic losses are increased also. So not only correct measurement and evaluation, but also countermeasure for improvement of power quality is surely necessary for both electric power supplier and customer. In this paper, the classification of events and variations occurred in distribution systems using S-transform is proposed. Firstly, we review for events and variations occurred in distribution system. Next, IEEE 13 Node Test is modeled for simulation of events and variations on various conditions using ElectroMagnetic Transient Program - Restructured Version (EMTP-RV). Finally, simulation results are analyzed by using S-transform.