低压载波通信信道阻抗测量与信号建模(英文)

在低压电力线上,阻抗随时间和频率的变化会造成电力载波通信信号的衰减、反射和多径传播,严重影响低压电力线载波通信产品的性能,但由于低压电力线上的阻抗受拓扑结构和所连接的电气负载的影响,具有复杂多变的特征,因此很有必要测量并总结阻抗随时间和频率的变化规律。通过现场测量,采集了部分低压配电网中不同通信节点在100~500-kHz频率之间的阻抗特征数据,并基于这些测量数据,利用阻抗推导法建立了信号衰减模型和基于二端口网络的信号传输模型。仿真结果表明,所建立的信号衰减和传输模型能够有效逼近实际测量结果。

Measurement of Low Voltage Power Line Communication Channel Impedance and Signal Transmission Modeling

The variation of impedance with time and frequency of low voltage power line can affect the performance of low voltage power line communication devices by causing attenuation,reflection and forming multi-path during signal transmission.However,due to the topologies and loads integration,impedances of low voltage power line and loads are various in a complicated manner,which makes it necessary to maintain impedance properties of low voltage distribution network.This paper presented measurements and analysis of the impedance of several electric loads and communication nodes of low voltage residential distribution network at frequencies from 100 kHz to 500 kHz.Benefited from these impedances measurement results,impedance related signal attenuation transmission model and two-port network based signal transmission model were built using impedance deduction method.The simulation results verified that these models can approximate the real measurement result satisfactorily.