A Study on Adaptive Protection System of Distribution Network Based on Passive Protection Terminal of Ring Network Cabinet

For the distribution network with high permeability distributed energy access, distribution network fault current distribution network operation mode, the influence of the distributed power control strategy, and the existing in ring network cabinet configuration does not meet the high sensitivity and high reliability requirements of the active power of fuse protection, in this paper, an adaptive protection system for active distribution network is proposed by using the passive protection terminal installed in the ring network cabinet and the protection host configured at the dispatching end. The protection host receives SCADA data of distribution network scheduling to obtain the topology of active distribution network, uses distributed power supply voltage and grid voltage to adaptively calculate the passive protection setting value, and sends the setting value to the passive protection terminal through communication to realize the adaptive protection function of active distribution network. Finally, the simulation model is established, and the fuse protection of active distribution network and the adaptive protection system with passive protection terminals are compared, and the sensitivity and reliability of the adaptive protection scheme are verified.