一种不依赖MU同步的采样值网络传输方案  

The Network Transmission Scheme of Sampling Values Not Relied on MU Synchronization

作　　者：朱明[1] 瞿萍[1] 

机构地区：[1]国电南京自动化股份有限公司,南京210003

出　　处：《电气技术》2014年第11期62-65,69,共5页Electrical Engineering

摘　　要：IEC 61850标准的组网采样值传输方案由于依赖统一同步网络,降低了数字化站可靠性。点对点采样值传输方案虽然解决了对同步源的依赖问题,但因二次接线复杂且损失了数据共享优势,降低了数字化站可维护性。本文采用不依赖MU同步的网络传输方案,通过特殊交换机记录网络传输延时并将延时反映在报文的特定字段中,实现了采样值的同步计算。经测试,该方案时间同步精度误差为ns级别,满足采样精度要求的同时具备了与传统组网方案相当的实时性。该方案不仅解决了跨间隔采样对同步源依赖的问题,提高了智能数字化系统的总体可靠性,并兼顾了数字化变电站运行维护方便的特征,因此在智能电网和数字化变电站的实际应用中具有很好的应用前景。The IEC 61850 standard network transmission scheme of sampling-values（SV） completely depends on the synchronous network, which reduces the reliability of digital substations. Although the point to point transmission scheme of SV eliminates the synchronous source dependence, it makes the secondary wiring complex, loses the data sharing advantages, and reduces the maintainability of digital substations.This paper uses a new network transmission scheme which doesn’t rely on the synchronized merging units’（MU） SV. In this scheme, the network transmission delays are recorded by special switches and filled in the specific field of the data packet, then the SV Synchronization calculations implement. After testing, this scheme’s networking real-time is quite similar to traditional scheme, while its time synchronous accuracy error, under ns level, meets the accuracy requirement of sampling. This scheme eliminates the synchronous source dependency of cross-interval sampling, improves the overall reliability of intelligent digital systems, and also considers the digital substation’s maintainability. So it has good prospects in practical application of smart grids and digital substations.

关 键 词：IEC 61850 采样值 延迟记录 采样同步 网络传输 

分 类 号：TM76[电气工程—电力系统及自动化]