舟山柔性直流输电工程的直流电缆操作过电压计算与分析

发布时间：2018-03-23 03:27

本文选题：高压电力电缆　切入点：柔性直流　出处：《高电压技术》2017年11期 　论文类型：期刊论文

【摘要】：高压电力电缆在柔性直流输电工程中扮演中输送稳定电能的重要角色,其过电压故障会对电网安全运行造成严重的影响,而国内关于高压电缆操作过电压机理以及计算的研究较少。为此,依托舟山柔性直流输电工程,在PSCAD/EMTDC平台上,分析了同轴高压直流电缆的等效阻抗和导纳参数,并分别计算了不同故障条件下的直流电缆操作过电压。基于统计分析方法,采用线路分段技术研究了直流海底电缆的操作过电压沿线分布规律。研究结果表明:直流电缆沿线接地故障过电压值呈伞形分布,中部最大,两侧递减;导体-铅套操作过电压最大值为400.2 kV,发生在直流电缆沿线接地故障的条件下;铅套-铠装和铠装-大地操作过电压最大值分别为7.27 kV和0.45 kV,发生在交流相地和相间故障的条件下;导体-铅套、铅套-铠装和铠装-大地操作冲击绝缘水平分别为460.23 kV、8.36 kV和0.52 kV。该研究结果可以为高压电力电缆线路的绝缘配合提供重要的依据。
[Abstract]:High voltage power cable plays an important role in the transmission of stable electric energy in the flexible DC transmission project, and its overvoltage fault will seriously affect the safe operation of the power network. However, there are few studies on overvoltage mechanism and calculation of HV cable in China. Based on Zhoushan flexible DC transmission project, the equivalent impedance and admittance parameters of coaxial HVDC cable are analyzed on PSCAD/EMTDC platform. The operating overvoltages of DC cable under different fault conditions are calculated respectively. The distribution law of the operating overvoltage along the DC submarine cable is studied by using the line segmentation technique. The results show that the overvoltage of the grounding fault along the DC cable is umbrella distribution with the largest in the middle and the decrease in both sides. The maximum operating overvoltage of conductor and lead sleeve is 400.2 kV, which occurs under the condition of grounding fault along DC cable. The maximum values of overvoltage of lead sheath-sheathed and sheath-geodetic operation are 7.27 kV and 0.45 kV, respectively, which occur in the condition of alternating current and interphase faults. The insulation levels of lead sheath-armored and sheath-earth operation impact insulation are 460.23 kV and 0.52 kV respectively. The results can provide important basis for insulation coordination of HV power cable lines.
【作者单位】：南瑞集团公司(国网电力科学研究院);国网电力科学研究院武汉南瑞有限责任公司;国网浙江省电力公司舟山供电公司;
【基金】：国家电网公司科技项目(2014320001510110)~~
【分类号】：TM721.1

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