面对电力系统对同步时钟的迫切需求,如何保证同步时钟的精度和可靠性成为重要问题.基于GPS和IEEE-1588协议,主要利用FPGA技术研制了一种时钟同步装置.该装置可同时进行IEEE-1588同步和接收GPS、IRIG-B码同步源发送的秒同步信号,可供选择的同步方式保证了同步的可靠性;在以太网物理层和MAC层之间的MII处检测和标记1588报文是实现高精度同步的关键方法,且1588校正本地时钟时实现了平滑修正.测试结果显示1588同步误差小于500 ns,该装置具有同步精度高、可靠性好的特点,将其应用于同步相量测量单元(PMU)中,可以满足电力系统广域测量对同步时钟的要求.%The accuracy and reliability of synchronous clock become important issues for the urgent need of power system. A clock synchronization device based on GPS and IEEE-1588 protocol is developed by using FPGA technology. It can process IEEE-1588 protocol and receive the second synchronous signals of GPS and IRIG-B code at the same time. The optional way of synchronization ensures its reliability. A detecting and time-stamping strategy for 1588 messages in Mil between physical layer of Ethernet and MAC layer is a key way to achieve high-precision synchronization, and the local clock is corrected smoothly. The test results show that 1588 synchronization error is less than 500 ns. It has the characteristics of high synchronization precision and good reliability. And when applied to the Phase Measurement Unit(PMU), it meets the precision request of clock synchronization of WAMS.This work is supported by National Natural Science Foundation of China (No. 50977007).
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