母线分流效应对中压电力线载波通信网络架构的影响

基于中压配电母线典型拓扑结构,分析推导母线分流效应对电力线载波通信(PLC)信道特性的影响,在此基础上提出一种自适应频点选择算法及2种中压配电网PLC网络架构。基于输入电抗的频点选择算法,可在保证信道质量的前提下提高选频速度,结合中压配电网实际结构,建议以近母线侧节点作为频点测试发起者。PLC子网主节点设置于配电线路出口处的网络架构与设置于线路中部的网络架构相比较,后者可减弱母线分流效应带来的不利影响,提高PLC网络的经济性与可靠性。仿真结果与现场测试验证了理论分析及所提第2种网络架构的合理性。

Influence of Busbar Shunting Effect on Network Structure of Medium-voltage Power Line Communication

The influence of busbar shunting effect on power line communication(PLC)channel characteristics is analyzed based on the typical topology of medium-voltage distribution busbar. And then an adaptive frequency selection algorithm and two kinds of PLC network structure used in medium-voltage distribution network are proposed. The frequency point selection algorithm based on input reactance can improve the selection speed under the premise of guaranteeing the quality of the channel. Combined with the actual structure of medium-voltage distribution network, it is suggested taking the busbar-side PLC node as the initiator of frequency point test. Compared the network structure with the main node of the PLC subnet at the line exit, that one in the middle of the line can reduce the adverse influences caused by busbar shunting effect and improve the economy and reliability of PLC network. The simulation results and field test verify the rationality of the theoretical analysis and the proposed second network structure.