Unsymmetrical fault diagnosis in transmission/distribution networks

In this paper, we design a model-based fault diagnosis scheme capable of real time detection of symmetrical and unsymmetrical faults in the transmission/distribution network of a sample power system comprising a single-machine connected to an infinite bus-bar. A generic state space linear model of the system is first derived, and then a fault diagnosis scheme is designed, based on sliding mode observer (SMO) theory. Accuracy and real-time fault detection capabilities of the proposed fault diagnosis scheme are illustrated through simulation studies.

► New model-based real time fault diagnosis based on the theory of sliding mode observer is presented.
► Symmetrical and unsymmetrical faults in the transmission/distribution network are considered.
► Faults and states are reconstructed in real time in their entirety.