This paper studies the precise clock management technology for the power consumption information collection system which demands precise requirements of the electric power meter clock. The causes of the clock deviation of the collection system and the problems caused by the clock deviation are analysed first; Then the key technologies for achieving accurate time synchronization are explained; Next, the master station and terminal time synchronization algorithm is designed. Only two NLP synchronizations are required to obtain a high accuracy time deviation, and the accuracy of the algorithm is demonstrated through a test of an example. Finally, the electric power meter time adjustment scheme using a combination of broadcast time adjustment and ESAM point-to-point time adjustment is designed to achieve high accuracy and low error, which has high reliability and practicality.

针对用电信息采集系统对电表时钟提出的精确要求，本文研究了精确时钟管理技术。首先分析了采集系统时钟偏差的原因以及时钟偏差引起的问题；然后阐述了实现精确时间同步的关键技术；接下来设计主站和终端时间同步算法。只需要两次NLP同步即可获得高精度的时间偏差，并通过算例测试证明了算法的准确性。最后设计了采用广播校时与ESAM点对点校时相结合的电表校时方案，实现高精度、低误差，