Faulty phase active power characteristics‐based adaptive single‐phase reclosing schemes for shunt reactors‐compensated wind power outgoing line

Abstract

This paper proposes two novel adaptive single‐phase auto‐reclosing (ASPAR) schemes for shunt reactors‐compensated wind power outgoing (WPO) line. After extinction of a fault on a single phase‐tripped WPO line, due to the existence of shunt reactors and distributed capacitors, a free frequency component will emerge in the tripped faulty phase, which will make faulty phase active power calculated with instantaneous power algorithm have a bigger magnitude and more frequency components. According to these characteristics, transient fault identification (TFI) methods based on active power root mean square (RMS) value and twisty beat frequency were put forward. Subsequently, in view of abovementioned TFI methods, ASPAR schemes for a shunt reactors‐compensated WPO line based on faulty phase active power characteristics were established. Simulation experiments, which were conducted using the software PSCAD/EMTDC, verified that the proposed ASPAR schemes can distinguish transient faults from permanent ones rapidly and reliably. The experiments also proved that the proposed adaptive single‐phase reclosing schemes can minimize the influence of changes in fault location and transition resistance and, thus, are suitable for the inconsistent output power of a wind farm and the complex working condition of an outgoing line.

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 [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. Increasing faulty phase reactive or active power after secondary arc extinction was used to detect arc extinction for shunt compensated transmission lines.…”

Applicability study of single‐phase reclosing in tie line of photovoltaic power plant

“…According to (8), since the negative-sequence equivalent impedance is almost the load impedance, which is generally much larger than the zero-sequence equivalent impedance, the composite-sequence network shown in Figure 4(a) can be simplified to the equivalent circuit shown in Figure 4(b). In Figure 4, V f represents the open-circuit voltage of the fault port, and its value is the difference value between the PVS equivalent voltage source (Z LD ̇Ig1 ) and the power system equivalent potential source ( Ė′ g ) in Figure 3(b).…”

“…At present, most studies on the single-phase reclosing of the renewable energy power plant are about the adaptive reclosing [8,9], whose key point is to correctly judge whether the line fault is transient or permanent, and then decide whether to reclose. Obviously the precondition for realising adaptive reclosing is that when the single-phase of tie line is disconnected, the renewable energy power plant cannot exit operation due to over-voltage or over-current.…”