变电站自动化系统中的时间同步问题

2011 IEEE International Workshop on Applied Measurements for Power Systems (AMPS) Pub Date : 2011-12-01 DOI:10.1109/AMPS.2011.6090431

P. Ferrari, A. Flammini, S. Rinaldi, G. Prytz

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引用次数: 6

摘要

在同一变电站自动化系统中混用新旧IEC 61850设备的主要问题之一是基于网络的时间同步问题。IEC61850定义了两种不同的协议用于在站和进程总线上分配时间:SNTP和IEEE1588 PTP。这两种协议具有几乎不同的时间表示和同步方案。当使用SNTP的旧IEC61850设备必须集成到具有ptp兼容网络基础设施的新变电站中时，可能需要时间网关。讨论了典型变电站自动化系统中的时间同步问题，分析了一种紧凑型时间网关的性能;它是一种透明的双端口设备，插在交换机和终端设备之间的最后一条网络链路上。通过基于FPGA的嵌入式样机进行了测试。实验结果表明了时间网关概念的适用性，为同步精度和设备复杂性之间的权衡提供了有用的提示。

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Time synchronization concerns in substation automation system

One of the main problems in mixing old and new IEC 61850 devices in the same substation automation system is related to the network-based time synchronization. The IEC61850 defines two different protocols for distributing time in Station and Process Bus: SNTP and IEEE1588 PTP. The two protocols have almost different time representations and synchronization schemes. When an old IEC61850 device with SNTP has to be integrated into new substations with PTP-compliant network infrastructure, time gateways may be required. The paper discusses the time synchronization concerns in a typical Substation Automation System and analyzes the performance of a compact Time Gateway; it is a transparent, two-ports, device which is inserted in the last network link between the switch and the end device. The tests have been carried out by means of an embedded prototype based on FPGA. The experimental results show the applicability of the Time Gateway concepts, giving useful hints on the trade off between synchronization accuracy and device complexity.

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2011 IEEE International Workshop on Applied Measurements for Power Systems (AMPS)

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