Expert system approach to fault diagnosis of HVDC systems

Abstract

This paper describes a new approach to fault diagnosis of high-voltage direct current (HYDc) systems and Important features in developing a fault diagnosis expert system (FDES). The logical behaviour exhibited by the converter under normal and abnormal conditions forms the basis of the expert system. The logical behaviour of the converter represented in tenus of the valve conduction pattern is used to detect and diagnose faults in the converter. Logical analysis of the converter behaviour provides a set of relations which are listed for fault diagnosis. The FOES is implemented in TURBO-PROLOG for various faults on the converter.