网络参数对低压宽带电力线信道的影响

The Effect of Network Parameters for Low-Voltage Broadband Power Line Channels

在电力线载波信道的研究中，目前有关电网结构对电力线载波性能的影响研究较少，多径效应和频率选择性衰落现象难以从现有模型得到合理解释，也对电力线节点间的通信性能和路径拓扑中继理论支持不足，制约了宽带电力线载波通信性能的提升。针对此，通过使用基于传输线理论的方法对低压电力线通信信道仿真建模，分析了不同网络拓扑结构对频率为2～30MHz的低压宽带电力线信道特性的影响。仿真得到不同电力线长度、分支长度、单节点分支数、分布式分支数和负载阻抗的低压宽带电力线信道频率响应，并通过反傅里叶变换得到对应的信道时域冲激响应。结果表明，电力线信道频率响应中的峰值点和陷波频点的位置和衰减会受到上述网络参数的影响，时域冲激响应也会因此而衰减和失真。本文的研究对于宽带电力线通信技术在能源互联网中的有效应用具有重要意义。

On the broadband power line channel, there is little research nowadays on theinfluence of power grid structure related to power line carrier performance. Multipath effect andfrequency selective fading are difficultly explained from existing models, they have insufficient supportto the communication between power line nodes as well as the relay by network topology, which limitsthe performance improvement for power line carrier communications. For the sake of the aforementionedreasons, this work analyzes the influence of different network topologies on low-voltage broadbandpower line channel (BPLC) characteristics in 2～30MHz frequency range by simulating and modelingthe power line communication channel based on transmission line theory. The frequency responses ofthe low-voltage BPLC are obtained by changing the lengths of the direct and branched lines, number ofconcentrated branches, number of distributed branches and load impedances. The time-domain impulseresponses are also studied by using inverse Fourier transform. The results show that aforementionednetwork parameters affect the positions and attenuation of the notches and peaks in the amplituderesponses. As a result, the time-domain impulse responses will be attenuated and distorted. The resultsin this paper are useful in the applications of broadband power line communication technology toenergy network.