基于IEC 61850标准的数字化电能表丢帧误差分析

发布时间：2018-02-22 22:06

本文关键词： 数字化电能表 IEC 丢帧误差数字化电能表误差数字化电能计量系统　出处：《电测与仪表》2016年24期 　论文类型：期刊论文

【摘要】：数字化电能表做为数字化电能计量系统中关键设备,其误差大小直接决定了数字化电能计量系统的准确度,数字化电能表在信号输入形式上与传统电能表存在很大的差异,传统电能表的输入信号为三相模拟电压/电流,而数字化电能表的输入信号为遵循IEC 61850协议的数据帧,因此数字化电能表相对传统电能表而言存在一个重要的误差来源—丢帧误差。针对数字化电能表的丢帧误差从理论上进行分析,同时对确定等级的数字化电能表允许最大丢帧率进行了推导,并通过实验仿真验证,发现数字化电能表的丢帧误差在丢帧率一定的情况下随着丢帧序号的变化呈现出正弦变化的规律,且最大丢帧误差与采样频率无关。分析得出要忽略丢帧对数字化电能计量系统造成的误差时,数字化电能表允许的最大丢帧率应该在数字化电能表的准确度等级5%以下,且建立相关的丢帧测试项目对数字化电能表入网运行前进行检测具有重要意义。
[Abstract]:Digital watt-hour meter is the key equipment in digital electric energy metering system. Its error directly determines the accuracy of digital power metering system. There is a great difference between digital watt-hour meter and traditional watt-hour meter in the form of signal input. The input signal of the traditional watt-hour meter is three-phase analog voltage / current, while the input signal of the digital watt-hour meter is the data frame following the IEC 61850 protocol. Therefore, there is an important error source in digital watt-hour meter compared with traditional watt-hour meter-frame loss error. At the same time, the allowable maximum frame loss rate of the digital watt-hour meter with certain grade is deduced, and verified by experiment and simulation. It is found that the frame loss error of the digital watt-hour meter is sinusoidal with the change of the sequence number of the lost frame at a certain frame loss rate. And the maximum frame loss error has nothing to do with the sampling frequency. It is concluded that the maximum frame loss rate allowed by the digital watt-hour meter should be below 5% when the error caused by the frame loss to the digital electric energy metering system should be ignored. It is of great significance to establish the relevant frame loss test items for the detection of digital watt-hour meters before they are put into the network.
【作者单位】：贵州电网有限责任公司电力科学研究院;华中科技大学;
【基金】：中国南方电网公司科技项目(K-GZ2014-096)
【分类号】：TM933.4

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