基于锁相环技术的智能变电站时钟同步方案

A Clock Synchronization Scheme in Smart Substation Based on Phase-Locked-Loop Technology

现阶段,北斗卫星接收机输出的1PPS信号通常作为智能变电站时钟同步装置的主要时钟源,但是卫星时钟源通常存在短期稳定性较差的特点,伴随有较大的随机误差。为克服这种影响,文章针对北斗信号对北斗卫星接收机的输出信号进行二次处理,利用卫星时间信号和高精度本地晶振在时间稳定性上的互补,确立了一种采用本地晶振进行替代授时的本地时钟源方案,其中利用锁相环技术对相位误差进行了测量和校正,仿真结果验证了该方案的可行性。

At present,the signal 1PPS which output through Beidou satellite receiver usually work as the main clock source in smart substation.But the short-term stability of satellite clock source is usually poor and follows with a large random error.In order to overcome this effect,this paper carries on secondary design with1 PPS signal in the Beidou satellite receiver,using the fact that satellite clock time signal and local oscillator that has high precision time stability can compensate each other.Finally the scheme that local clock source is replaced by a local oscillator to time is established,which uses the technology of the phase-locked loop to measure and correct the phase error,and simulation results verify the feasibility of the scheme.