配电网载波通信信道的分析和建模

为实现可靠和高速的10kV电力线载波通信,有必要对配电网载波信道的传输特性进行研究。基于二端口网络和传输线理论,建立了配电网载波信道的转移矩阵模型。该模型的参数容易计算和测量,能够分析网络中任意2个节点之间的信号传播规律。基于该模型给出了线路整体工作衰减的计算方法,揭示了线路产生频率选择性衰落的原因。针对配电网中大量存在的阻抗不匹配环节,分析了配电网中部分线路的工作衰减。结果表明,该衰减值与线路其他部分有关,传统简单估算的结果误差较大。基于PSpice建立了一个10kV线路的信道模型,验证了理论方法的正确性,并据此提出了对通信系统设计的建议。

Analysis and modeling of distribution line carrier communication channel

The characteristics of 10 kV power line carrier communication channel are studied to achieve the reliable and high-speed communication. Based on the theory of two-port network and transmission line,the A BCD-parameter matrix channel model is established. It is easy to calculate and measure the parameters of model and analyze the propagation law of signal transmission between any two nodes. Based on the model, the method of line attenuation calculation is given and the causes of frequency selective fading are revealed. For the impedance mismatch in distribution network ,the partial line attenuation is analyzed,which shows that,it is related to the other parts and the traditional simple estimation may lead to a serious error. A 10 kV power line carrier communication channel model is built with PSpice to verify the correctness of the theoretical method and some proposals are put forward for the planning of communication system.This work is supported by the Youth Foundation of North China Electric Power University.