摘要
从时域和频域两个方面总结了应用矩量法计算阀厅内金属导体结构产生的电磁骚扰水平的方法。直接时域方法以电流为激励源进行计算,考虑因素少,计算简单;而直接频域方法由于可以同时考虑线路、金属架构等多种复杂结构的影响,模型更为准确,但是计算速度慢,建模复杂。考虑到常用的矩量法计算软件如NEC、FEKO等,不适合建立大量电流源模型,因此以电压源、导线、金属板和负载为基本元件的直接频域法就非常适合借助于成熟的软件进行工程计算。首先将±500 kV阀塔的元器件、金属导线和金属框架分别用阻抗、线天线和面天线模型进行等效。对一±500 kV换流站阀厅建立了电磁计算模型,研究了换流站在正常工作情况下由阀厅内金属导体结构产生的电磁骚扰特性,主要讨论阀厅墙体附近的辐射电磁场,阀厅外的无线电干扰水平。通过与测试结果和其它相关报告的结果对比验证了该计算方法和模型的有效性和正确性。应用该方法分析了±800 kV换流站阀厅内金属导体结构产生的电磁骚扰水平,并结合相关标准提出了阀厅墙体应具备的屏蔽效能。该研究既可以用来预测换流站内的电磁场分布,也可为阀厅的屏蔽设计提供依据。
The electromagnetic disturbance from valve hall was analyzed,and the electromagnetic disturbance generated by the metal conductor structure in the valve hall of a ±500 kV converter station under normal state,especially the radiation electromagnetic field in the vicinity of the valve wall and the radio interference outside the valve hall were investigated.The electromagnetic model of the ±500 kV converter station valve hall was established by taking the element component of valve tower,metal conductor line and metal structure equalized as impedance,wire antenna and surface antenna,respectively.The comparison of testing results and other published results indicates that the proposed method is effective and accurate.By using the presented method the electromagnetic disturbance resulted from the metal conductor structure in the valve hall of ±800 kV converter station is analyzed.Combined with associated standard,the required shield efficiency of the valve wall is proposed.The research can be used both to evaluate the distribution of the electromagnetic field in converter station and for the shielding design of valve hall.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第3期643-648,共6页
High Voltage Engineering
基金
国家"十一五"科技支撑计划(2006BAA02A20)~~
关键词
高压直流
换流站
阀厅
矩量法
电磁骚扰
频域
时域
HVDC
convert station
valve hall
method of moment
EMD
frequency domain
time domain
