Expert system for classification of measured three-phase unbalanced voltage dips

This paper presents a new ANN-based expert system to classify voltage sags using measured three-phase voltages. The results of the proposed system is compared to those of previously proposed works such as symmetrical component (SC), six-phase (6P), three-phase three-angle (TPTA) algorithms developed to identify voltage sags of types C and D. Numerical examples and recorded voltages are used to validate the expert system.