基于时钟状态估计的电力系统广域冗余对时模型

Synchronization redundant model for wide-area power system based on clocks' state estimation

对晶振时钟、全球定位系统(GPS)时钟、网络对时以及原子钟的性能进行了评述,在此基础上,提出了基于时钟状态估计的冗余对时模型。该模型下的时钟装置通过对各时钟的误差状态进行估计,并根据误差状态选择合理的运行模式,产生用于各站点内设备对时的统一时钟。时钟装置的秒脉冲时间精度的测试试验结果表明,在该模型下产生的时钟结合了各种对时时钟的优点,提高了电力系统广域同步的精确性、稳定性以及可靠性。

The clocks generated by crystal oscillator, received via Global Position System（GPS） receiver, rectified by network, and atomic clock are appraised. On this base, A wide-area synchronization redundant model is proposed. The clock equipments work for this model estimate the error of each clock, and choose a appropriate work mode according to the estimated error, to generate a unite clock for the synchronization of devices in the substation. The result of test experimentation for pulses per second（PPS） generated by the clock equipment indicates that the clock generated in this model assembles the strongpoints of each clock, and it will improves the precision, stability and reliability of wide-area synchronization for power system.