模块化多电平换流器型柔性直流输电海缆过电压特性
发布时间：2018-10-20 14:15
【摘要】：作为柔性直流输电工程的连接单元,直流海底电缆的绝缘水平关系着输电工程的安全运行。以舟山多端柔性直流输电工程中定海换流站至岱山换流站的海底柔性直流电缆为研究对象,采用统计法仿真计算了模块化多电平换流器型柔性直流输电海缆过电压分布规律,得出柔性直流海缆的绝缘水平。通过仿真计算,得出了直流电缆的故障过电压最大值,即导体对铅套、铅套对铠装和铠装对地的最大过电压分别为403.44 k V、6.72 k V和0.39k V;选取30%的绝缘裕度,确定了直流电缆的绝缘水平,即导体对铅套为525 k V、铅套对铠装为9 k V和铠装对地为0.6 k V。计算结果可为柔性直流电缆的选型及试验提供重要参考。
[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.
【作者单位】： 国网电力科学研究院;国网舟山供电公司;国网黄石供电公司;
【基金】：国家电网公司科技项目(海底电缆运行特性及运维规程研究)~~
【分类号】：TM721.1
[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.
【作者单位】： 国网电力科学研究院;国网舟山供电公司;国网黄石供电公司;
【基金】：国家电网公司科技项目(海底电缆运行特性及运维规程研究)~~
【分类号】：TM721.1
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