With comprehensive application of modern electrical power system, various systems and automation devices require a strict clock synchronization.Currently, the time synchronization technology used in electrical power system of China is mainly based on the satellite timing of the American Global Positioning System (GPS).Considering the security and stability of the electrical power system, we studies the electrical power system clock synchronization technology which is based on the Bei-dou and GPS dual-mode timing, and designed a time synchronization system which adapt to the adaptation technologies of Multi-Sync Source, Bei-dou, GPS, and local high-stability ovencontrolled crystal oscillator (OCXO) hot spare of each other.The time synchronization accuracy of the system is improved up to ±0.1μs and punctual accuracy is better than 1μs/min.The device satisfies the technical requirements for electrical power system time synchronization,which has practical application value.%现代电力系统覆盖范围广,各种系统和自动化装置都要求严格的时钟同步;目前应用于我国电网中的时间同步技术主要是基于美国全球定位系统(GPS)的卫星授时;从电网的安全性和稳定性出发,对基于北斗/GPS双模授时的时间同步技术进行了研究,设计了采用多同步源自适应同步技术,北斗、GPS和本地高稳恒温晶体振荡器(OCXO)互为热备的时间同步系统;该系统时间同步精度优于±0.1μs,守时精度优于1 μs/min,符合电网时间同步系统技术要求,具有一定的实用价值和推广应用价值.
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