Locating Natural Frequency Faults in HVDC Transmission Systems Based on the Rotation-Invariant Technology Signal Parameter Estimation Algorithm and the Total Least Squares Method

Table 6

Comparison of TLS-ESPRIT algorithm and FFT algorithm.

Actual point of failure (km)	TLS-ESPRIT (Hz)	Calculated ranging point (km)	FFT (Hz)	Calculated ranging point (km)	Increased accuracy (%)
20	3737	20.17	3877	19.34	+24.50
50	1506	50.04	1388	54.03	+79.80
75	1011	74.55	899	84.52	+132.93
100	752	100.23	733	102.32	+27.50
125	604	124.79	577	129.98	+41.52
150	502	150.15	480	156.25	+40.67