变电站信号分流对中压配网电力线载波通信的影响

中压配电网不允许沿线装设阻波器,电力线载波通信(power line communication,PLC)信号会通过变电站配电母线分流进入各条线路。首先给出变电站信号分流现场实测数据,然后建模分析信号分流对信道特性的影响,发现在变电站信号分流影响下功率传输特性比电压传输特性更能准确反映信道质量。最后在载波节点通信距离受信号分流影响而变化的条件下,结合分层搜索组网算法仿真分析主节点位置对PLC网络结构的影响。仿真结果表明PLC主节点选择在线路中段可增大其通信范围,减小网络层数,从而减弱变电站信号分流产生的不良影响。

The influence of substation signal shunting on power line communication in medium voltage distribution network

Wave trapper is not allowed to install in medium voltage distribution network, so the signal of power line communication (PLC) will be distributed through the substation bus into various lines. Firstly, the measured data of substation signal shunt is given. Then the model of PLC network is builded, and the influence of signal distribution on the channel characteristics is analyzed. It is found that power transmission characteristics can reflect PLC channel quality more accurately than voltage transmission characteristics under the influence of substation signal shunting. Finally, under the condition that the communication distance is affected by signal shunting, the influence of the main node position on PLC network structure is simulated and analyzed based on the hierarchical search networking algorithm. The simulation results show that setting the main node of the PLC network on the middle of the line can increase the communication range and reduce the number of network layers, so as to weaken the negative influence of the substation signal shunting.