中压配电网PLC信道正反向传输特性分析  

Forward and backward transmission characteristics Analysis of PLC channel in medium voltage distribution networks

作　　者：王艳[1] 薛晨[1] 焦彦军[1] WANG Yan;XUE Chen;JIAO Yanjun(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《电力科学与技术学报》2020年第3期127-134,共8页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(51807063);中央高校基本科研业务费专项资金(2016MS90)。

摘　　要：中压配网电力线载波通信信道的电压传输特性具有不对称性,在中压配网上进行PLC装置实测时发现,这种不对称性影响了建立连接的效率。自此背景下,首先使用局部反射理论建立PLC信道模型,并在此基础上分析了典型中压配网拓扑结构下的正、反向电压传输特性规律。分析表明均一主干信道或者架空—电缆—架空主干信道条件下,信道特性可只分析正、反向中任意一个方向,架空—电缆主干信道条件下,可只分析由架空线到电缆的信道特性;主干信道外侧网络对PLC信号具有分流效应,由分流效应较强的一端向另一端传输时信道质量较差;PLC装置通过在线检测信道输入阻抗的电抗分量,可选择较优的通信频点。Voltage transmission characteristics of power line communication(PLC)channel are asymmetric in medium voltage distribution networks.It is found that the asymmetry reduces the efficiency of establishing connection when the PLC device is tested at the medium voltage distribution network.In this paper,a PLC channel model is established based on the partial reflection theory.Then the forward and backward voltage transmission characteristics are analyzed in typical topologies of medium voltage distribution networks.The results show that under the condition of homogeneous trunk channel or overhead-cable-overhead trunk channel,channel characteristics can be only analyzed in either direction of forward or backward.And for the condition of overhead-cable trunk channel,only the channel characteristic of overhead to cable needs to be analyzed.The lateral network among trunk channels has a shunt effect on PLC signals.The channel quality is poorer when the signal is transferred from the terminal with a stronger shunt effect.In addition,the PLC device can select a better communication frequency by detecting the reactance component of the on-line input impedance.

关 键 词：电力线载波通信 中压配网 信道特性 频率选择 

分 类 号：TM71[电气工程—电力系统及自动化]