同塔双回交流线路改直流线路合成电场分析

发布时间：2018-06-08 13:14

本文选题：交流改直流 + 同塔多回直流线路　；参考：《电网技术》2015年06期

【摘要】：随着用电负荷急速增长,电网输送容量也亟需提升。在一定条件下,将已有交流线路改为直流线路,既可提高线路的输送容量,又可大幅减小建设投资,受到国内外关注。将上流有限元法进行拓展,应用于同塔双回交流线路改直流线路后同塔多回直流线路合成电场的计算,模拟试验线段试验结果验证计算方法的有效性。考虑典型500 k V同塔双回交流线路改为±500 k V直流线路,对不同导线型号和直流线路极导线不同排列方式下的导线表面场强和地面合成电场进行计算,并对其特性进行分析。在此基础上,确定改造后直流线路经过非居民区和居民区时的极导线最小高度和线路走廊宽度。结果表明,对于采用常用导线的500 k V同塔双回交流线路,改为±500 k V直流线路,选择适当的极导线排列方式,可以使地面合成电场满足标准要求。
[Abstract]:With the rapid growth of power load, the transmission capacity of power grid also needs to be improved. Under certain conditions, changing the existing AC lines to DC lines can not only increase the transmission capacity of the lines, but also greatly reduce the construction investment, so it has attracted much attention at home and abroad. The upper-flow finite element method is extended and applied to the calculation of the composite electric field of the same tower multi-circuit DC line after the conversion of the double-circuit AC line of the same tower to the DC line, and the effectiveness of the calculation method is verified by the simulation test results of the line segment test. Considering that the typical 500kV double-circuit AC line with the same tower is changed to 卤500kV DC line, the surface field strength and the ground composite electric field of different wire types and different arrangement modes of DC line pole conductors are calculated, and their characteristics are analyzed. On this basis, the minimum height of the pole conductor and the width of the corridor are determined when the transformed DC line passes through non-residential areas and residential areas. The results show that for the 500kV double-circuit AC transmission line with the same tower which is used in common use, changing to 卤500kV DC line and choosing the proper arrangement of polar conductors, the ground composite electric field can meet the requirements of the standard.
【作者单位】：中国电力科学研究院;
【分类号】：TM751

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