Abstract
Abstract To solve the problems of the rapid deterioration of the three-stage overcurrent protection performance after the extensive access of inverter distributed generators, the deterioration of the traditional longitudinal protection performance, and the problems of 0/0 calculation results and insufficient waveform difference measurement of the existing similarity protection algorithms, a longitudinal protection scheme based on M_T comprehensive similarity was proposed. Firstly, the transmission communication delay of the 5G core network is analyzed, and the mini-slot technology is proposed to effectively reduce the communication delay. Secondly, the M-K mutation initiation algorithm adapted to the characteristics of inverter DG faults was used to replace the traditional phase current mutation detection algorithm. The fault self-synchronization with higher precision was realized. Finally, M_T comprehensive similarity is constructed to describe the difference between the short-circuit current waveform of the system side and the inverter-distributed generator side. The changes in the similarity coefficient of faults in and out of the area are analyzed. A new principle of longitudinal protection based on the comprehensive similarity of M_T is formed. The simulation results show that the proposed new protection principle can reliably identify faults in and out of the area, will not have the anomaly of 0/0 of Pearson coefficient and cosine similarity calculation results, and has better anti-transition resistance ability than the Tanimoto similarity algorithm, which is fully suitable for distribution networks with distributed generators.
Published Version
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