Research on Differential Protection and Power Recover Technology of Distribution Network Based on 5G

This paper proposes a method for differential protection and rapid power supply restoration of the distribution network, which is based on 5G communication. Two types of differential protection sampling synchronization methods are introduced in detail: the sampling sequence synchronization method that depends on the external synchronization clock and the fault time synchronization method that does not rely on the synchronization clock. The protection terminals share protection action signals through the 5G communication network. After confirming that the fault has been isolated, the open-loop point switch is quickly closed to restore the power supply to the non-faulty area. A 5G test environment was set up in the laboratory, and the test results showed that the rapid protection and power restoration scheme proposed in this article can isolate the fault in 0.1s and restore the power supply in 0.2s. This method can solve the problem of selectivity and rapidity of current distribution network protection.