一种实现合并单元同步采样的方案

Strategy of Implementing Synchronous Sampling for Merging Unit

合并单元(MU)是实现对电子互感器信息采集的一个重要部件。为了实现合并单元的同步采样功能,保护现场设备的安全,根据IEC 61850协议,提出了一种采用FPGA实现同步采样功能的方案。利用全球定位系统(GPS)和高精度晶振,实现同步信号的产生。由于晶振本身存在误差,在同步脉冲丢失以后,提出一种误差消除策略。经过软件分析和试验论证,该方案大大提高了合并单元的同步精度。

Merging unit （MU} is an important part for achieving information collection for electronic current transformer { ECT）. In order to implement synchronous sampling function of MU, and protect field devices, in accordance with IEC 61850 protocol, the scheme of implementing synchronous sampling function by using FPGA is proposed, and the synchronous signals are generated by adopting global position system （GPS} and high precision crystal oscillation. Due to error exists in crystal oscillator itself, the error elimination strategy is proposed for situation of losing synchronous pulse. The software analysis and test verification show that this scheme largely enhances the synchronization accuracy of MU.