论文部分内容阅读
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。
On the low-voltage power line, the change of impedance with time and frequency will cause the attenuation, reflection and multipath propagation of power line communication signal, seriously affecting the performance of low-voltage power line carrier communication products. However, due to the topology of the impedance and the connected Of the electrical load, with complex and ever-changing features, it is necessary to measure and summarize the impedance with time and frequency changes. Based on the field measurements, the impedance characteristics of different communication nodes in the low-voltage distribution network between 100 kHz and 500 kHz were collected. Based on these measurements, the signal attenuation model and the two-port network Signal transmission model. The simulation results show that the established signal attenuation and transmission model can effectively approximate the actual measurement results.