Pilot Protection for Multi-Terminal Flexible DC Distribution Network Based on Current Mode Component Characteristics
The multi-terminal flexible DC distribution net-work has drawn a lot of attention due to its major advantages in terms of power delivery dependability.However,the rapid and accurate detection of faults in DC line protection has become one of the key issues that need to be addressed in its rapid de-velopment.For that reason,a DC line pilot protection method utilizing the characteristics of current mode components was designed.This method uses the direction of the positive current aerial mode component during a fault to distinguish between in-ternal and external faults,constructs the protection criteria,which distinguish the type of fault,and forms a protection strategy based on the difference in the average value of the pos-itive current zero-mode component at the fault point under dif-ferent fault conditions.Finally,a multi-terminal flexible DC distribution network model was built on PSCAD/EMTDC4.5,and simulation analysis was conducted on the protection criter-ia and key influencing factors.The results show that this protec-tion method can selectively,quickly,and reliably identify faults and fault types inside and outside the zone,and has good resist-ance to transition resistance and noise.
DC distribution networkaerial mode compon-entzero-mode componentfault identificationline pilot protection
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