Fig .6 Simulation of the current fault component waveform when an
internal fault occurs
From Fig. 6, it can be seen that when an internal fault occurs on the DC
line the fault components of the positive current at 4 and 5 of the
converter stations on both sides are both positive, and the fault
components of the negative current are both negative. The fault current
waveforms collected by the corresponding poles are positively
correlated, with high similarity and small waveform distance.