交直流同塔多回输电线路导线布置方式与走廊宽度研究

发布时间：2018-06-18 18:02

  本文选题：交直流同塔线路 + 地面混合电场　； 参考：《电网技术》2017年01期

【摘要】：交直流同塔线路混合电场是决定导线对地高度和走廊宽度从而进行线路优化设计的重要因素。由于其地面横向分布是交流分量和直流分量共同作用的结果,因此其分布特性与两者的叠加和分布特点有着密切的联系。以两回330 k V、750 k V交流线路分别与单回?1100 k V直流线路同塔架设为例,分析了交流线路在不同布置方式与相序排列方式下地面混合电场的分布特性与规律,并据此计算了导线对地最小高度和走廊宽度。结果表明,根据混合电场交、直分量的横向衰减特性,从走廊中心向外,地面混合电场可分为交流分量占主导的"交流区",交、直流分量比例相当的"混合过渡区"以及直流分量占主导的"直流区",为保证地面交、直流分量"错峰"布置,两回交流线路应采用垂直或倒三角排布方式,此时导线最小对地高度按照交流线路单独运行时的情况设计即可。当交流为750 kV线路时,走廊宽度主要由交流电场控制;交流为330 kV线路时,走廊宽度则由交直流电场分量共同控制。最终推荐采用垂直排布的相序6和倒三角排布的相序4两种布置方式。
[Abstract]:The hybrid electric field of AC / DC transmission line is an important factor to determine the height of the conductor to the ground and the width of the corridor so as to optimize the design of the line. Because the lateral distribution of the ground is the result of the interaction of the AC component and the DC component, its distribution characteristics are closely related to the superposition and the distribution characteristics of the two components. Taking two AC lines of 330kV or 750kV as an example, the distribution characteristics and rules of ground mixed electric field under different arrangement and phase sequence arrangement of AC lines are analyzed, respectively, with the same tower of 1100kV DC lines of a single circuit. The minimum height of the conductor to the ground and the width of the corridor are calculated accordingly. The results show that according to the transverse attenuation characteristics of the direct component and the intersection of the mixed electric field, the ground mixed electric field can be divided into "AC region" dominated by AC component from the center of the corridor. The "mixed transition zone" with the same DC component ratio and the "DC area" dominated by the DC component should be arranged vertically or inversely in order to ensure the ground AC and the "staggered peak" arrangement of the DC component. At this point, the minimum height of the wire to the ground can be designed according to the case of the AC line running alone. When AC is 750 kV, the width of corridor is mainly controlled by AC field, and when AC is at 330 kV, the width of corridor is controlled by AC-DC electric field. Finally, the vertical arrangement of phase sequence 6 and the inverted triangle arrangement of phase sequence 4 are recommended.
【作者单位】： 国网北京经济技术研究院;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);
【基金】：国家电网公司科技项目(SGTJ0000KXJS1 400081)~~
【分类号】：TM75
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本文编号：2036391