同塔双回交流线路改直流线路合成电场分析  

Study of Total Electric Field of DC Lines Converted From Double-Circuit AC Lines

作　　者：马晓倩[1] 陆家榆[1] 鞠勇[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2015年第6期1538-1545,共8页Power System Technology

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。As electricity demand increases rapidly, transmission capacity needs to be enhanced. In some cases, converting existing AC transmission lines to DC lines can increase the transmission capacity and reduce the construction investment. The upstream finite element method was expanded to calculate the total electric＂ field of same tower multi-circuit DC lines converted from double-circuit AC lines, and its validity was confirmed by experiments. In case of a DC line converted from a typical 500 kV double-circuit AC line, the surface electric field of bundle conductor and the ground total electric field in different pole conductor bundles arrangements were calculated and analyzed, and the minimum height of pole conductor bundles and corridor width of DC lines in residential and non-residential area were determined. The results indicate that for DC lines converted from common 500 kV double-circuit AC lines, the ground total electric field could meet the requirements of corresponding standard with appropriate pole conductor bundles arrangements.

关 键 词：交流改直流 同塔多回直流线路 极性排列 合成电场 极导线对地高度 走廊宽度 

分 类 号：TM152[电气工程—电工理论与新技术]