基于PI的合并单元同步校准实用技术

智能变电站合并单元的同步性直接关系到所采集的电气量实时数据的时间一致性。高效的合并单元同步校准系统保证了合并单元数据的一致性。研究了合并单元的同步源和同步误差产生的原因,讨论了常见的时钟同步方法。提出了基于移相法和频率微调法的合并单元校准系统,并引入比例积分调节器对合并单元校准系统进行了同步控制。实际测试结果表明:采用所提方法后,同步偏差的波动范围从原先的600 ns至900 ns区间下降到40 ns左右,证明了所提方法的有效性。

Practical technology of synchronization calibration based on PI for merging unit

The synchronization of the intelligent substation merging unit is directly related to the time consistency of the collected real-time data. The efficient merge unit synchronization calibration system ensures the data consistency of merging unit. This paper studies the reasons of the synchronization source and synchronization error of the merging unit, and discusses the common clock synchronization method. A merging unit calibration system based on phase shift method and frequency fine adjustment method is proposed, and the proportional integral regulator is introduced to synchronize the control system of the merging unit calibration system. It introduces the implementation process of PI-based merging unit synchronization calibration system. The actual test results show that the range of the synchronization deviation fluctuates from the original 600 ns to 900 ns interval to about 40 ns after using this method, which proves the effectiveness of the method. This work is supported by Science and Technology Project of State Grid Fujian Electric Power Company Ltd. (No. 521304150043).