基于OFDM技术的配电系统载波通信网络研究

发布时间：2018-06-04 15:39

本文选题：配电系统 + 载波通信　；参考：《华北电力大学》2017年硕士论文

【摘要】：智能配电网作为智能电网的重要组成部分,是坚强智能电网的基石。中压配电网电力线载波通信的实现,对于完善更灵活、更简洁的智能配电网具有重要的实际应用价值。本文基于OFDM技术开展配电系统载波通信网络应用研究,内容如下:(1)设计了一套基于OFDM技术的中压电力线载波通信装置,包括硬件电路设计、程序设计以及配套软件开发。在实际测试应用过程中,根据测试中发现的问题,对硬件装置进行了3次改进,完善了装置性能。(2)通过对中压电力线载波信道的分析以及实际现场测试,得出提升中压电力线载波通信装置性能的两条有效途径:减小载波信号衰减、规避载波信道频率选择性衰落凹点。在实际应用中,实现耦合装置与载波通信装置的阻抗匹配对减小载波信号衰减具有重要作用。在载波装置中端接一精密数字可调电阻,根据实际耦合装置参数,通过MCU控制单元调节精密数字可调电阻的数值,实现阻抗匹配,减少了信号衰减。同时,为有效规避载波信道频率选择性衰落凹点,提出了中压电力线载波通信自适应最优子信道选择算法,动态调整载波子信道,实现最优分配,并将算法程序嵌入到载波通信装置,实测效果良好。(3)针对实际中压配电线路通信节点众多,配电网络复杂,且对通信网络后期扩展性要求较高等问题,提出了先组建星型载波通信网,进而构建树形载波通信网,逐级扩展,最终实现通信节点全覆盖的灵活组网方式。最终用自主设计的中压电力线载波通信装置在实际配电线路上挂网测试,通信效果较为理想。
[Abstract]:As an important part of smart grid, smart distribution network is the cornerstone of strong smart grid. The realization of power line carrier communication in medium voltage distribution network has important practical application value for perfecting more flexible and succinct intelligent distribution network. In this paper, the carrier communication network application of distribution system based on OFDM technology is studied. The contents are as follows: 1) A set of medium voltage power line carrier communication device based on OFDM technology is designed, including hardware circuit design, program design and supporting software development. In the course of practical testing and application, according to the problems found in the test, the hardware device has been improved three times, and the performance of the device has been improved by the analysis of the medium voltage power line carrier channel and the actual field test. Two effective ways to improve the performance of medium voltage power line carrier communication device are obtained: reducing the attenuation of carrier signal and avoiding the frequency selective fading concave of carrier channel. In practical applications, the impedance matching between the coupling device and the carrier communication device plays an important role in reducing the attenuation of the carrier signal. A precise digital adjustable resistor is connected in the carrier device. According to the actual coupling device parameters, the numerical value of the precision digital adjustable resistance is adjusted by the MCU control unit to achieve impedance matching and reduce the signal attenuation. At the same time, in order to avoid frequency selective fading concave of carrier channel effectively, an adaptive optimal subchannel selection algorithm for medium voltage power line carrier communication is proposed to dynamically adjust the carrier subchannel to achieve optimal allocation. The algorithm program is embedded into the carrier communication device, and the measured results are good. Aiming at the problems such as the number of communication nodes in the actual medium voltage distribution line, the complexity of the distribution network, and the high demand for the later expansibility of the communication network, etc. First, the star carrier communication network is constructed, and then the tree-shaped carrier communication network is constructed, which can be extended step by step, and finally, the flexible network with full coverage of communication nodes is realized. Finally, the medium voltage power line carrier communication device designed by ourselves is used to test the actual distribution line, and the communication effect is satisfactory.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM73;TN913.6

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