Pilot protection of hybrid MMC DC grid based on active detection

Protection and Control of Modern Power Systems

Table 4 Protection results with different sampling rates

Sampling rates (kHz)	Correlation coefficient (positive/negative)	Fault section	Fault pole	Operate or not (Y/N)
2	−0.833/0.905	internal	positive	Y
5	−0.825/0.917	internal	positive	Y
10	−0.819/0.913	internal	positive	Y
15	−0.896/0.924	internal	positive	Y
20	−0.931/0.911	internal	positive	Y

From the simulation results, it can be seen that the correlation coefficient is largely not affected by the sampling rate, ensuring the correct operation of the protection in case of internal faults