基于STM32F407的时钟同步系统的实现

Implementation of Precision Clock Synchronization Based on STM32F407

随着电力系统复杂程度的提高,智能化变电站对系统内各节点时钟同步精度的要求越来越高;IEEE1588精确时钟同步协议的应用使得系统内时钟同步精度达到纳秒级别;文章对IEEE1588时钟同步的原理进行了分析,设计了基于STM32F407处理器的时钟同步系统;介绍了本地时钟向量调节与频率调节两种时钟调节方式;最后测试主从时钟同步精度,结果表明同步精度在200ns以内,满足智能变电站对系统内时钟同步精度的要求。

With the increasing complexity of the power system, a higher precision of clock synchronization is demanded in the intelligent substation. Using IEEE1588 precision time protocol, the synchronization accuracy of clocks in a system could reach the nanosecond level. The paper analyses the basic principle of IEEE1588 protocol and an IEEE1588 synchronization clock system based on STM32F407 microprocessor is implemented. It also introduces two local clock synchronization methods., vector adjusting and frequency adjusting. With testing the master--slave clock time synchronization precision, the results show that the high precision clock synchronization below 200ns is realized, which can fulfill the time synchronization requirements of the substation.