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Table 2 Protection results under noise interference

From: Pilot protection of hybrid MMC DC grid based on active detection

Distance km / (fault type)

Correlation coefficient (positive/negative)

Fault section

Fault pole

Operate or not (Y/N)

30(single-pole)

−0.873/0.945

internal

positive

Y

100(single-pole)

−0.923/0.937

internal

positive

Y

150(single-pole)

−0.895/0.916

internal

positive

Y

250(single-pole)

−0.832/0.907

internal

positive

Y

f2(pole-to-pole)

0.941/0.932

external

/

N

30(pole-to-pole)

−0.824/−0.865

internal

pole-to-pole

Y

100(pole-to-pole)

−0.866/− 0.897

internal

pole-to-pole

Y

150(pole-to-pole)

−0.813/− 0.821

internal

pole-to-pole

Y

250(pole-to-pole)

−0.842/− 0.851

internal

pole-to-pole

Y

f3(pole-to-pole)

0.913/0.922

external

/

N

  1. From the simulation results, it can be seen that the protection principle has strong anti-interference capability