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Table 3 Protection results under grounding fault with fault impedance

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

Fault impedance Ω/distanceCorrelation coefficient (positive/negative)Fault sectionFault poleOperate or not (Y/N)
0.01/150−0.903/0.931internalpositiveY
50/150−0.801/0.928internalpositiveY
100/150−0.731/0.916internalpositiveY
300/150−0.633/0.902   
0.01/250−0.923/0.919internalpositiveY
50/250−0.836/0.917internalpositiveY
100/250−0.766/0.913internalpositiveY
300/250−0/612/0.901   
0.01/f20.942/0.918external/N
50/ f20.937/0.922external/N
100/ f20.926/0.911external/N
0.01/f30.954/0.947external/N
50/ f30.946/0.932external/N
100/ f30.928/0.915external/N
  1. From the simulation results, it can be seen that the model identification pilot protection based on active detection using the capacitance model to identify the fault section has strong anti-fault impedance capability in principle