特高压直流输电线路电磁环境及研究.pdf

华北水利水电学院硕士学位论文特高压直流输电线路电磁环境研究摘要特高压直流输电工程具有电压等级高、导线截面大、单条线路走廊宽等特点,其电磁环境与高压直流输电工程有一定差别,由此带来的环境影响受到各方关注,必须采取措施加以限制,使其满足环境保护的要求。特高压直流输电线路的电磁环境是特高压直流输电工程设计、建设及运行中必须考虑的重大技术问题之一。本文主要研究特高压直流输电线路的电磁环境问题,其主要参数包括合成电场、离子流密度、磁场、可听噪声和无线电干扰。本文首先比较了特高压直流输电线路电磁环境计算方法,以向家坝一上海特高压直流输电工程为基础,参考极导线水平布置的双极±800kV直流输电线路模型,利用 MATLAB软件对特高压直流输电线路电磁环境进行了仿真研究。然后,计算了极导线水平布置的±800kV特高压直流输电线路电磁环境的总体水平,进一步详细讨论了线路结构参数(导线分裂数、子导线截面、导线分裂间距、极导线对地高度和极导线间距)对特高压直流输电线路电磁环境的影响。最后,提出了减少特高压直流输电线路电磁环境影响的措施。关键词:特高压直流输电线路;电磁环境;合成电场:离子流密度;直流磁场;可听噪声;无线电干扰;线路结构参数 IC ENVIRONMENT l之ESEARCH OF UHV DCTRANSMISSION LINE ABSTRACT UHVDC(U1tra Hi曲V01tage t)trallsmissionprojeCt haSsome typical charact耐stics,including hi曲Voltage,la略e wirecross·section,widesin百e dor etc. Theelec缸Dma弘eticenViroment ofUHVDC仃ansmission project isdi脑-ent舶m HVDC 仃ansmissionprojeCt,aJld thee疏Ct totheenViro衄锄t shouldbeConcemed,some necessary measures mustbetaken tomake meetmerequir锄ents ofeIⅣiromnemal protection Theelec仃oma印etic饥Viro砌ent ofUHVDC缸硼smission project is a11 important teclulical issue indesi印ing,cons仃ucting a11dmIlIling tlleUHVDC仃a11smission present p印er studiesmesubject ic t inUHVDC佃aIlsmission projeCt,tlle mainpar锄eters are synthetic electricfield, ic field,audiblenoise,radio interference. First,me method ofme elec怕ma弘etic enVironment ofUHVDC仃ansmission toShan曲ai ect as a11exaI】1ple,baSed on themodel ofpole horizontalbip01ar±800kV direct Currentt眦smission line,the simulation oftlleelectrom艇皿etic enVironment of UHVDC transmission isstudiedbyusing MATLAB. Then,t11e levelofthatmodel iscalculated,f啪1er more,me e虢ct ofstmctural par锄eters(number ofConduCtorbuIldle、cross-sectional area ofsub—Conductor、split spacing of conductorbundle、hei曲t-to-groulld ofp01ar conduCtor a11dspacing ofpolarconductor)to me elec仃0ma鲈etic enViroIlIIlentofUHVDC打aIlsmission isdiscussed. Finally'me meaSures ofreducing也e e舵ct ic肌Vironment of UHVDC transmission arepmposed. KEY WORDS:UHVDC t舢smission line