Algorithm for adaptive single‐phase reclosure on shunt‐reactor compensated extra high voltage transmission lines considering beat frequency oscillation

Adaptive Overhead Transmission Lines Auto-Reclosing Based on Hilbert–Huang Transform

“…The energy trapped in the reactor and shunt capacitor of the transmission line oscillates until complete damping, and this energy oscillation between the transmission line and the parallel compensation creates a sub-synchronous component in the isolated phase voltage. In the literature, the created resonance after fault clearance has been used to diagnose secondary arc extinction [15,18,[24][25][26][27][28][29]. There is no sub-frequency component during fault, however, after the secondary arc extinguishing in the frequency range of 0 to 60 Hz, a sub-synchronous component appears in the faulty phase voltage for compensated transmission lines.…”

“…Shunt reactors are widely used in high voltage transmission lines to improve power system stability and line voltage profile regulation [23]. The methods presented in [24][25][26][27][28][29][30] are effective for shunt compensation transmission lines. In these methods, the beat frequency generated after the quenching of the secondary arc was used to detect the quenching of the secondary arc.…”

“…In [25], mode currents of shunt reactors were calculated, then the presence and number of natural frequencies were used to distinguish the fault nature. In [26], the differences of faulty phase terminal voltage between the two fault states after arc extinction was utilized as a criterion to detect fault nature and clearance. In [27,28], the instantaneous power algorithm was utilized to compute faulty phase reactive and active power, respectively, using local voltage and current measurements.…”

Improving the stability of power transmission lines based on an adaptive single pole auto‐reclosure using a two‐step strategy

“…The proposed technique uses an adaptive threshold value as well. The authors in [23], analyse the features of faulty phase terminal voltage considering the neutral small reactance voltage as a base value. Then, the ratio of faulty phase terminal voltage to neutral small reactance voltage for the measured and calculated values is achieved and the difference between them is used as a threshold for fault type recognition.…”

Hardware implementation of a real‐time adaptive single‐phase auto‐reclosure for power transmission lines

“…Otherwise, the fault is permanent and though, two healthy phases should be tripped as well. In Ning et al, an adaptive SPAR for TLs with shunt reactors based on the transient beat frequency oscillations after the secondary arc extinguishing is proposed. Luo et al use the fact that the number of oscillating frequencies of faulted phase currents of shunt reactors is different before the fault extinction after that and propose a three‐phase adaptive reclosing scheme for TLs with shunt reactors.…”