Analyzing Worst-Case Delay Performance of IEC 61850-9-2 Process Bus Networks Using Measurements and Network Calculus
Analyzing Worst-Case Delay Performance of IEC 61850-9-2 Process Bus Networks Using Measurements and Network Calculus
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使用测量和网络演算分析 IEC 61850-9-2 过程总线网络的最坏情况延迟性能
DOI：
10.1145/3077839.3077856
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Xiaoguang Ma
中科院分区：
文献类型：
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作者：
Huan Yang;Liang Cheng;Xiaoguang Ma
在基于 IEC 61850 的变电站自动化系统 (SAS) 中，传统的硬连线过程连接正在被交换以太网取代。为了确保系统的可靠性和响应能力，保护和控制任务所需的关键信息的传输必须始终满足硬延迟约束。因此，在SAS项目的设计阶段应考虑延迟性能一致性。在本文中，我们建议通过测量和基于网络演算的分析相结合来研究 IEC 61850-9-2 过程总线网络的最坏情况延迟性能，该网络通常承载非前馈流量模式。由于以太网交换机支持其多个接口之间的专用互连，因此我们提出的方法通过为其各个输出接口引入服务模型，而不是使用单个服务模型对其进行整体建模，将非前馈网络转换为前馈网络。为了得出可以根据测量结果进行验证的实际延迟界限，我们的方法不仅根据过程总线网络和交换以太网的特性构建流量模型，而且还通过测量建立网络设备的服务模型。我们对前馈和非前馈过程总线网络的案例研究结果表明，所提出的网络演算和基于测量的建模的组合为基于以太网的变电站通信网络（SCN）生成了准确的延迟界限。因此，设计人员和架构师可以采用所提出的方法来分析评估 SAS 设计的各个阶段的最坏情况延迟性能。
In power substation automation systems (SASs) based on IEC 61850, conventional hardwired process connections are being replaced by switched Ethernet. To ensure system reliability and responsiveness, transmission of critical information required by protection and control tasks must satisfy hard delay constraints at all times. Therefore, delay performance conformance should be taken into consideration during the design phase of an SAS project. In this paper, we propose to study the worst-case delay performance of IEC 61850-9-2 process bus networks, which generally carry non-feedforward traffic patterns, through the combination of measurements and network-calculus-based analysis. As an Ethernet switch supports dedicated interconnections between its multiple interfaces, our proposed approach converts a non-feedforward network into feedforward ones by introducing service models for its individual output interfaces instead of modeling it in its entirety with a single service model. To derive practical delay bounds that can be validated against measurement results, our approach not only constructs traffic models based on the idiosyncrasies of process bus network and switched Ethernet, but also establishes service models of networking devices by taking measurements. Results from our case studies of both feedforward and non-feedforward process bus networks show that the proposed combination of network calculus and measurement-based modeling generates accurate delay bounds for Ethernet-based substation communication networks (SCNs). The proposed approach can thus be adopted by designers and architects to analytically evaluate worst-case delay performance at miscellaneous stages of SAS design.