Accuracy evaluation of delivered measurements to HMI in a real SCADA automation system

2011 2nd International Conference on Instrumentation Control and Automation Pub Date : 2011-11-01 DOI:10.1109/ICA.2011.6130172

H. Khazaei Targhi, H. Sheisi, H. Moradmand

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引用次数: 4

Abstract

Data transmission between RTUs (Remote Terminal Unit) and HMI at control center in SCADA (Supervisory Control And Data Acquisition) automation system is accompanying with delays due to several reasons such as: limitation in data transmission rate, distance between RTU and control center, traffic of communication network and the time needed for data modulation and processing. These delays can cause errors in delivered measurements to the HMI at control center. This paper evaluates how these communication delays can affect the accuracy of transmitted measurements as viewed by HMI in automation system of a real power distribution network. Experimental measuring has been performed to obtain the time delays in data exchange between RTU and HMI. A stochastic model, based on the obtained experimental results, is then employed to model the data transmission delay for that real automation system of power network. It will be shown how the accuracy of delivered measurements to HMI will change depending on the change rate in power network conditions when there are delays in data transmission network of the SCADA automation system.

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在实际SCADA自动化系统中对HMI交付测量的精度评价

在SCADA (Supervisory control and Data Acquisition)自动化系统中，由于数据传输速率的限制、RTU与控制中心之间的距离、通信网络的流量以及数据调制和处理所需的时间等原因，RTU与控制中心HMI之间的数据传输存在一定的延迟。这些延迟可能导致在向控制中心的HMI交付测量结果时出现错误。本文评估了在实际配电网自动化系统中，这些通信延迟对HMI传输测量精度的影响。实验测量了RTU和HMI之间数据交换的时延。在实验结果的基础上，采用随机模型对实际电网自动化系统的数据传输时延进行建模。当SCADA自动化系统的数据传输网络存在延迟时，交付给HMI的测量结果的准确性将如何根据电网条件的变化率而变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2011 2nd International Conference on Instrumentation Control and Automation

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