数字化变电站过程层采样值时间同步性分析及应用  

Synchronized sampling of process layer in digital substation

作　　者：王立辉[1,2] 许扬[1,2] 陆于平[1] 袁宇波[2] 孙健[2] 

机构地区：[1]东南大学电气工程学院,江苏南京210096 [2]江苏省电力试验研究院,江苏南京210036

出　　处：《电力自动化设备》2010年第8期37-40,44,共5页Electric Power Automation Equipment

基　　金：中国博士后科学基金资助项目(20100471357)~~

摘　　要：提出由合并单元(MU)发出统一的采样同步脉冲至同一间隔中的电子式电流/电压互感器,在电子式电流/电压互感器信号处理系统中对本地时钟信号进行分频或倍频处理后与采样同步信号锁相,发送A/D采样时序,确保同一间隔中所有电子式电流/电压互感器采样值时间同步。设计了基于IEEE1588的多基准源时间同步方案,并对站与站之间、站内终端设备之间、电子式电流/电压互感器中A/D采样信号同步特性以及网络交流流量对时间同步的影响等进行了测试和评估;要求在变电站内配置时间综合测量仪,对同步性能在线监测。It is proposed to issue the unified sampling sync pulse by MU（Merging Unit） to ensure the synchronized sampling of all ECT/EVT（Electric Current Transducers and Electric Voltage Transducers） in one cell.The signal processing system of ECT/EVT divides or multiplies locks the frequency of local clock signal to lock its phase according to the sync pulse and sends the sampling time sequence to every A/D converter.The synchronization scheme of multi-reference clock is designed based on IEEE1588.The performance of synchronization system and the influence of network flow on it are tested and evaluated for clock synchronization between substations,between MUs within substation and between A/D sampling signals in ECT/EVT.It is also proposed to equip the synthetic time meter to online monitor the synchronization performance.

关 键 词：数字化变电站 合并单元 时间同步 同步误差 对时协议 

分 类 号：TP764[自动化与计算机技术—检测技术与自动化装置]