低压电力载波信道特性测试系统研究

发布时间：2018-03-21 06:10

本文选题：电力载波通信　切入点：信道特性　出处：《昆明理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：进入21世纪,科学技术迅速发展,借助电力线的庞大网络,得益于只要有电线,就能进行数据传输的优势,低压电力载波通信如雨后春笋般迅速发展。虽然电网的规模越来越大,由于用电设备标准不一,管理维护不规范等原因,我国的电力载波发展受到严重阻碍。因此,对低压电力载波基础信道的研究测试显得尤为重要,而噪声特性和阻抗特性是电力线信道的两个基础特性。深入研究噪声特性和阻抗特性使得提高通信质量更有针对性和可行性,对整个通信系统的研究有很重要的意义。本文针对低压电力线通信信道的噪声根据特点划分两大类,并分别建立模型,简单讨论LD算法参数求解,验证模型等相关技术内容。重点研究低压电力载波信道噪声特性和阻抗特性,根据建立的信道噪声模型和设备采集的实际数据,用MATLAB的强大数据处理能力对采集到的噪声和阻抗数据进行处理分析,分析了不同环境下电力线信道的阻抗变化范围和脉冲噪声特性的关系,进而发现低压电力线阻抗变化与脉冲噪声之间存在某种对应关系。从实际噪声数据中分离出脉冲噪声,得到实际背景噪声数据,通过控制实际背景噪声的和模型产生的纯净功率谱的绝对差值,来选择拟合最好的模型参数,并验证模型可靠性。根据模型,在VC6.0平台设计一款可以分析处理信道噪声特征参数的测试系统软件。针对低压电力线载波通信的恶劣环境,通过测试系统可以得到具体的模型参数,以便更好地了解不同环境噪声特性。对复杂环境的信道特性,可以更有针对性的选取适合的通信技术,为提高电力线通信质量创造条件。
[Abstract]:In 21th century, with the rapid development of science and technology, with the help of a huge network of power lines, thanks to the advantage of data transmission as long as there are wires, Although the scale of power grid is getting larger and larger, the development of power carrier in our country is seriously hindered because of the different standards of power equipment and non-standard management and maintenance. It is very important to study and test the basic channel of low voltage power carrier. The noise characteristic and impedance characteristic are two basic characteristics of power line channel. It is very important for the whole communication system to study the noise characteristic and impedance characteristic to improve the communication quality more pertinently and feasible. In this paper, the noise of low-voltage power line communication channel is divided into two categories according to the characteristics, and the models are established, and the LD algorithm parameter solution is discussed briefly. The noise characteristics and impedance characteristics of low-voltage power carrier channel are studied emphatically. According to the established channel noise model and the actual data collected by the equipment, the noise characteristics and impedance characteristics of the low-voltage power carrier channel are studied. Using the powerful data processing ability of MATLAB to process and analyze the collected noise and impedance data, the relationship between the range of impedance variation and impulse noise characteristics of power line channel in different environments is analyzed. It is found that there is a corresponding relationship between the impedance variation of low voltage power line and the impulse noise. The impulse noise is separated from the actual noise data and the actual background noise data is obtained. By controlling the absolute difference between the actual background noise and the pure power spectrum generated by the model, the best fitting parameters are selected and the reliability of the model is verified. A test system software is designed on VC6.0 platform, which can analyze and deal with the characteristic parameters of channel noise. In view of the bad environment of low voltage power line carrier communication, the specific model parameters can be obtained by the test system. In order to better understand the noise characteristics of different environments, the channel characteristics of complex environment can be more targeted to select the appropriate communication technology to create conditions for improving the quality of power line communication.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN913.6

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