Satellite common-view technique applied to power grid time synchronization

In view of time synchronization requirement in power grid, it is presented that a remote time transfer based on the satellite common-view (CV) technique, which can realize high precision time synchronization and frequency calibration. It is designed that timing system of power grid. This paper gives the framework of timing system of power grid and the functional division of the important part of the system. It introduces in detail the design and data processing algorithm of the system. A method of GPS/BD redundant configuration is used, which ensures the reliability and stability of time synchronization in electric grid, which can calibrate self-adapting and automatic the frequency of the Rb clock. It can keep time synchronization between primary reference clocks of power grid and local Coordinate Universal Time of National Time Service Center UTC(NTSC) using the Point to Multi-point mode of common-view time transfer. The high precision time synchronization accuracy is achieved in practice that the Root-Mean-Square is better than 5ns using GPS CV method, and it is better than 15ns using BD CV method. With the application of the satellite common-view technique, it will make a technological breakthrough for the stable operation of the power grid system. And it will be realized that the high precision and high stability and highly reliable time unification for the entire grid system in future research.