177 / 2023-10-20 14:27:42

A Novel Transient Bus Protection Algorithm Based on HHT

Transient busbar protection; Hilbert–Huang transform; Instantaneous amplitude; Transition resistance; Initial fault phase angle

3.Power system and automation > (2) Power system fault simulation and risk assessment

Basing on Hilbert-Huang transform, this study proposed a unique bus transient protection method. The algorithm decomposed the fault traveling wave currents of two lines connected to the bus into inherent mode function (IMFs) and integrated the instantaneous amplitudes of the IMFs and calculated their differences. The two instantaneous amplitudes and their differences were normalized, basing on the transient resistance and initial fault phase angle. The normalized two instantaneous amplitudes and their differences served as the joint fault feature. Therefore, under various fault conditions, the fault characteristics of the bus fault are very different from the out-of-area fault. Influence of the initial fault phase angle and transition resistance was minimized by normalizing the fault feature variables; thus, protection reliability was improved. By modelling several failure types of failures in a 500 kV power system in ATP-Draw, the viability of the presented algorithm was demonstrated