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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 sectionFault poleOperate or not (Y/N)
30(single-pole)−0.873/0.945internalpositiveY
100(single-pole)−0.923/0.937internalpositiveY
150(single-pole)−0.895/0.916internalpositiveY
250(single-pole)−0.832/0.907internalpositiveY
f2(pole-to-pole)0.941/0.932external/N
30(pole-to-pole)−0.824/−0.865internalpole-to-poleY
100(pole-to-pole)−0.866/− 0.897internalpole-to-poleY
150(pole-to-pole)−0.813/− 0.821internalpole-to-poleY
250(pole-to-pole)−0.842/− 0.851internalpole-to-poleY
f3(pole-to-pole)0.913/0.922external/N
  1. From the simulation results, it can be seen that the protection principle has strong anti-interference capability