Research of Beidou system in Electric Power System Time Service

Time service with the satellite time transfer has the benefits of high precision, anti-disturbance, around-the-clock broadcasting and so on. In virtue of these profits it will be widely used and fine foreground in research of timing service and application domain. For the moment, the most extensive used in research of timing service and application domain is GPS (Global Position System), but it is faulty in application that depending on GPS time service only. One of the problems is that being only a means in application is insecure. On the other hand, our country has no independence control power on GPS. According to above-mentioned reasons, our country has begun to research and actualize The Beidou navigation positioning system since 80's, and successfully complete set up of this navigation positioning system by launching the satellite 'Beidou No. 1' in 2003. On the basis of the brief introduction of the Beidou satellite time service system, This thesis analyses the necessity and feasibility which the Beidou time synchronization system applied to our country's electric power system.. In this thesis, theoretics and realization of electric power system time service signal - 1PPS (one pulses per second) which integrate the two characteristics of both Beidou satellite system time signal and OCXO (Oven Controlled Crystal Oscillators) are introduced, and the hardware of the Beidou satellite synchronous clock equipment based on the SCM and Beidou satellite OEM chip is designed. This Beidou satellite synchronous clock equipment make up of Beidou OEM receptor central proceeding unit and output connectors. Using the standard time signals supplied by Beidou OEM receptors, the central proceeding unit could deal with the data and domesticate OCXO, the output unit can export 1PPS which is provided with good characters of short and long term stability. It could make all clock in the power net synchronous by use of the output 1PPS standard time signals, thus, all clock in the power net could retain running highly synchronously. This new synchronous clock equipment has many advantages, such as simple, high precision, wide extension, no confine of geography and weather environment and so on. It is the ideal way to synchronize the clock. The item to collate the clock of the protection system together with the fault recorder momentarily and unified by the Beidou satellite synchronous clock within all the plants and substations in a scope can be very important for raising the level of power system automatization, especially for the development of fault analyzing, fault locating, stabilization judging and controlling technology.