基于IEEE 1588的变电站过程层采样值同步技术研究

为了提高变电站过程层网络采样值的同步精度,详细分析了基于IEEE 1588精确同步协议的变电站过程层采样值同步技术的原理与实现方式。分析对比了瞬时值差动与矢量差动的采样精度,研究了同步误差对差动保护采样值精度的影响;通过分析IEEE 1588协议同步的实现过程,并与毫秒级别对时协议NTP进行对比,指出了IEEE 1588实现所涉及到的关键技术。通过分析基于IEEE 1588过程层采样值同步在实际工程应用中的实现方式,论证了IEEE 1588协议的采样精度达到亚微秒级别,能够有效减小多端同步采样的精度,对于变电站安全稳定运行具有十分重要的意义。

Analysis of sample value synchronization in process level based on IEEE 1588

To improve the synchronous accuracy of network sampling values of process level, this paper analyzes the principle and realization way of sample value synchronization in process level based on IEEE 1588 in detail. First, the instantaneous value sampling precision and vector sampling precision are compared and influence of synchronization errors on sample value precision is analyzed. Then, synchronization of IEEE 1588 is expatiated by comparing with NTP of which synchronization precision is in millisecond level and essential parts of IEEE 1588 are studied. Last, realization of sample value synchronization in process level in engineering application based on IEEE 1588 is introduced, which proves that IEEE 1588 protocol can achieve sub-microsecond level of sampling accuracy and effectively reduce the multiport synchronous sampling accuracy, which is very significant for the security and stability of the substation.