变电站内2.4 GHz无线信道路径损耗建模

doi:10.11959/j.issn.1000-0801.2016195195

摘要/Abstract

摘要：

为了评估变电站内电磁干扰对电力通信系统的干扰，采用频域测量方法对某市110kV变电站、220kV变电站的2.4GHz电磁波路径损耗进行了测量和分析。针对测量数据，分别利用最小均方差和累积法对路径损耗模型中路径损耗指数和标准差相关参数进行估计，并建立了路径损耗模型，仿真结果表明，模型估计结果与测量值相差不大。另外，搭建了ZigBee仿真系统，在信噪比为5dB和10dB的情况下，仿真出误码率随距离的变化关系，为通信设备布置在变电站环境中提供了研究依据。

关键词: 短距离无线通信, ZigBee, 变电站, 路径损耗模型, 最小均方差, 累积法, 信噪比, 误码率

Abstract:

In order to assess the influence of electromagnetic interference in the substation of the electric power communication system,frequency measurement method was adopted to obtain the data of 2.4 GHz electromagnetic wave path loss of the substation of 110 kV and 220 kV in a certain city.By using the method of minimum mean square error (MMSE) and cumulative sum (CUSUM) to estimate the parameters of path loss model such as path loss index and the standard deviation,the path loss model was set up according to measured data,respectively.The simulation results show that the gap between estimation results and the measured values is not big.In addition,a ZigBee simulation system was constructed to simulate the relationship of bit error rate (BER) varies with distance in two cases of the signal to noise ratio (SNR) at 5 dB and 10 dB respectively.A research basis for short distance wireless communication devices decorated in the substation environment was provided.

Key words: short distance wireless communication, ZigBee, substation, path loss model, minimum mean square error, cumulative sum, signal to noise ratio, bit error rate

李强,张洪欣,罗佳祺,陆阳,李建岐,吕英华. 变电站内2.4 GHz无线信道路径损耗建模[J]. 电信科学, 2016, 32(7): 34-39.

Qiang LI,Hongxin ZHANG,Jiaqi LUO,Yang LU,Jianqi LI,Yinghua LV. Modeling of the 2.4 GHz wireless channel path loss in substation[J]. Telecommunications Science, 2016, 32(7): 34-39.

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参考文献 16

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距离/m	110 kV接收功率/dBm	220 kV接收功率/dBm
3	-67.94	-48.56
6	-70.88	-61.17
9	-75.41	-70.38
12	-77.75	-73.56
15	-79.01	-80.09
18	-80.59	-84.95
21	-82.16	-89.09
24	-83.54	-92.12
27	-84.96	-94.56
30	-86.51	-97.12

变电站	估计方法	路径损耗n	标准差σ
110 kV变电站	最小均方差	0.79	1.37
	累积法	0.92	2.08
220 kV变电站	最小均方差	2.23	1.98
	累积法	2.35	2.13

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