【摘要】：作為柔性直流輸電工程的連接單元,直流海底電纜的絕緣水平關(guān)系著輸電工程的安全運(yùn)行。以舟山多端柔性直流輸電工程中定海換流站至岱山換流站的海底柔性直流電纜為研究對象,采用統(tǒng)計(jì)法仿真計(jì)算了模塊化多電平換流器型柔性直流輸電海纜過電壓分布規(guī)律,得出柔性直流海纜的絕緣水平。通過仿真計(jì)算,得出了直流電纜的故障過電壓最大值,即導(dǎo)體對鉛套、鉛套對鎧裝和鎧裝對地的最大過電壓分別為403.44 k V、6.72 k V和0.39k V;選取30%的絕緣裕度,確定了直流電纜的絕緣水平,即導(dǎo)體對鉛套為525 k V、鉛套對鎧裝為9 k V和鎧裝對地為0.6 k V。計(jì)算結(jié)果可為柔性直流電纜的選型及試驗(yàn)提供重要參考。
[Abstract]:As the connection unit of the flexible DC transmission project, the insulation level of the HVDC submarine cable is related to the safe operation of the transmission project. Taking the submarine flexible DC cable from Dinghai converter station to Daishan converter station in Zhoushan multi-terminal flexible direct current transmission project as the research object, the over-voltage distribution law of modularized multilevel converter type flexible direct current transmission cable is calculated by statistical simulation. The insulation level of flexible DC cable is obtained. Through simulation calculation, the maximum fault overvoltage of DC cable is obtained, that is, the maximum overvoltage of conductor to lead sleeve, lead sheath to armor and armour to ground are 403.44 kV and 0.39 kV respectively, and the insulation margin of 30% is chosen. The insulation level of DC cable is determined, that is, the conductor pair lead sheath is 525 kV, the lead sheath pair armor is 9 kV and the sheathed ground is 0.6 kV. The results can provide an important reference for the selection and test of flexible DC cable.
【作者單位】： 國網(wǎng)電力科學(xué)研究院;國網(wǎng)舟山供電公司;國網(wǎng)黃石供電公司;
【基金】：國家電網(wǎng)公司科技項(xiàng)目(海底電纜運(yùn)行特性及運(yùn)維規(guī)程研究)~~
【分類號】：TM721.1

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