Stochastic Estimation of Balanced and Unbalanced Voltage Sags in Large System

This paper presents an analytical method for stochastic prediction of magnitude and number of voltage sags caused by short-circuit fault in power systems. The method represents the expression of voltage sag magnitude as a continuous function of distance to the fault. The mathematical formulation of the proposed method has been applied to the IEEE 30-bus Reliability Test System to illustrate its application.