中压配电网电力线载波通信系统自适应频点选择算法

摘要

在电力线载波通信中应用正交频分复用(Orthogonal Frequency Division Multiplexing, OFDM)技术需要进行频点的优选.在分析信道输入阻抗对电压传输特性影响的基础上,提出一种基于在线测量信道输入电抗的频点优选算法.首先在默认频点下完成通信节点的入网,然后通过在线监测信道输入电抗筛选出部分频点,在这些频点处测试上、下行信号强度,通过简单计算优选频点作为子载波通道.以保定市实际中压配网为例进行仿真验证.仿真结果表明所提算法在保证通信质量前提下,可以筛选掉大量不可用频点,提高了频点优化速度.%Optimization of frequency points is needed for the application of Orthogonal Frequency Division Multiplexing (OFDM) technology in power line carrier communication. Based on the analysis of the influence of channel input impedance on voltage transmission characteristics, a frequency selection algorithm based on on-line measurement of channel input reactance is proposed. First, the communication node network is completed under the default frequency, then partial frequency points are selected by online monitoring the channel input reactance, testing the uplink and downlink signal strength at these frequency points. Sub carrier channel frequency points are optimized after simple calculation. The simulation of the actual medium voltage distribution network in Baoding is taken as an example. The simulation results show that the proposed algorithm can filter out a large number of unavailable frequency points under the premise of guaranteeing the communication quality. Thus the frequency optimization speed is improved.