Abstract: The operation and maintenance, state monitoring and failure location of all kinds of power grid distribution network service and equipment terminal depend on the precise time synchronization. In view of time division long term evolution (TD-LTE) 4G wireless network communication technology, a TD-LTE frame synchronization mechanism was studied, which uses map absolute time and TD-LTE system synchronization frame structure, and proposes a power grid time synchronization method based on TD-LTE frame synchronization. Meanwhile, a time delay compensation mechanism was designed to revise delay caused by radio propagation multi-path for improving the accuracy of timing system. Finally, the feasibility of the method proposed was verified by simulation and analysis. It is shown that the time synchronization precision of wireless time service system can reach to sub-microsecond level, which can satisfy all kinds of distribution network service demands.

Key words: time division long term evolution, frame synchronization, time synchronization, time delay compensation, time service system