Abstract:

The fifth generation (5G) wireless network not only provides a low-cost bearing scheme for the differential protection service of distribution network, but also poses a threat of wireless network attacks. Considering the issue of system collapse due to line tripping after external attacks invade the distribution network, a differential fault protection method for medium voltage DC distribution network is proposed. The proposed method can detect the external cyber intrusions on the adjacent lines of the distribution network where the physical fault occurs at the same time.The modal transformation is conducted to obtain the line mode and zero mode voltage of the current limiting reactor deployed by the system. The simulation results show that the proposed method has high sensitivity to high impedance faults and good protection performance, which can effectively improve the security of differential protection services in distribution networks in 5G wireless network environments.

Key words: differential protection, distribution network, 5G, security protection, false data injection