变电站内空间电磁场对无线通信单元耦合机理分析

Analysis of Coupling Mechanism of Space Electromagnetic Field to Wireless Communication Unit in Substation

随着无线通讯设备在智能变电站内的普及,位于感知层的无线通信单元常安装在一次设备附近,电磁环境恶劣,无线通信单元的电磁兼容问题突出。统筹变电站内骚扰源特性、230 MHz无线通信单元结构特征,分析无线通信单元受扰主要路径、研究无线通信单元受扰机理;通过建模仿真分析,获得在既定骚扰作用下,无线通信单元天线及PCB板上产生的骚扰感应电压;通过对比前门耦合、后门耦合产生的骚扰感应电压,明确变电站空间电磁骚扰极易通过无线通信单元天线系统对设备产生干扰,提出变电站稳态电磁骚扰阈值与无线通信单元在变电站内布设的抗扰度改进措施。

Wireless communication equipment is popular in intelligent substation.The wireless communication unit located in the sensing layer is installed near the primary equipment.With the bad electromagnetic environment,the electromagnetic compatibility problem of the unit is prominent.In this paper,we integrated the characteristics of disturbance sources in substation and the structure of 230 MHz wireless communication unit to analyze the main disturbed paths and the disturbed mechanism of wireless communication unit.Through modeling and simulation analysis,we obtained the disturbance induced voltage generated on the antenna and PCB of wireless communication unit under the given disturbance.By comparing the disturbance induced voltage of front door coupling with that of back door coupling,it is clear that the electromagnetic disturbance is easy to interfere with the equipment through the antenna system.Based on this,we proposed improvement measures of the steady-state electromagnetic disturbance threshold and the immunity of the wireless communication unit in the substation.