有屏蔽线时特高压直流输电线路地面电场与离子流场计算与分析

发布时间：2018-01-20 07:57

本文关键词： 直流输电线路地面合成电场离子流场屏蔽线电晕区域分解法　出处：《电网技术》2017年07期 　论文类型：期刊论文

【摘要】：安装屏蔽线是限制特高压直流线路地面电场与离子流的一种有效措施。由于空间电荷的存在,屏蔽线的表面电场强度会被明显增强,因此需要通过合成电场而非标称电场判断屏蔽线的电晕情况。采用区域分解法对屏蔽线的屏蔽效果进行定量分析,在计算迭代过程中判断屏蔽线电晕的变化情况,考虑了屏蔽线电晕对于离子流场的影响。分别采用通量线法、不考虑电晕的有限元法和文中方法对地面电场与离子流进行预测,与实验缩尺模型测量结果进行对比,并对不同方法的计算差异进行比较分析。结果表明,屏蔽线电晕产生的异极性电荷会与极导线产生的离子流发生复合,且产生的地面场强方向与原电场方向相反,从而增强其对地面电场的屏蔽效果,计算方法中应当考虑屏蔽线的电晕效应。之后,针对一条典型的?800 k V特高压直流线路,分析了屏蔽线的布置方式对屏蔽效果的影响。
[Abstract]:The installation of shielding wire is an effective measure to limit the surface electric field and ion current of UHV DC transmission line. Due to the existence of space charge, the surface electric field intensity of shield wire will be obviously enhanced. Therefore, it is necessary to judge the corona of shielding line by synthetic electric field instead of nominal electric field. The shielding effect of shielding line is quantitatively analyzed by using domain decomposition method. The effect of shielding line corona on ion flow field is considered. Flux line method is used to determine the variation of shielding line corona. The surface electric field and ion current are predicted by the finite element method and the method in this paper, and compared with the measured results of the experimental scale model, and the difference of calculation between the different methods is compared and analyzed. The results show that the two methods can be used to predict the surface electric field and ion current. The heteropolar charge generated by the shielding line corona will compound with the ion current produced by the polar conductor, and the direction of the ground field intensity will be opposite to the original electric field direction, thus enhancing its shielding effect on the ground electric field. The corona effect of the shielding line should be taken into account in the calculation method. The influence of the layout of the shield line on the shielding effect is analyzed for 800 kV UHV DC line.
【作者单位】：电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系);甘肃省电力公司;北京电力经济技术研究院;东北电力大学电气工程学院;
【基金】：国家电网公司科技项目(SGTJ0000KXJS1 400081)~~
【分类号】：TM75
【正文快照】： 断屏蔽线的电晕情况。采用区域分解法对屏蔽线的屏蔽效果进行定量分析,在计算迭代过程中判断屏蔽线电晕的变化情况,考虑了屏蔽线电晕对于离子流场的影响。分别采用通量线法、不考虑电晕的有限元法和文中方法对地面电场与离子流进行预测,与实验缩尺模型测量结果进行对比,并对不

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