本文選題：交直流同塔線路 + 地面混合電場�。� 參考：《電網(wǎng)技術(shù)》2017年01期

【摘要】：交直流同塔線路混合電場是決定導(dǎo)線對地高度和走廊寬度從而進(jìn)行線路優(yōu)化設(shè)計的重要因素。由于其地面橫向分布是交流分量和直流分量共同作用的結(jié)果,因此其分布特性與兩者的疊加和分布特點有著密切的聯(lián)系。以兩回330 k V、750 k V交流線路分別與單回?1100 k V直流線路同塔架設(shè)為例,分析了交流線路在不同布置方式與相序排列方式下地面混合電場的分布特性與規(guī)律,并據(jù)此計算了導(dǎo)線對地最小高度和走廊寬度。結(jié)果表明,根據(jù)混合電場交、直分量的橫向衰減特性,從走廊中心向外,地面混合電場可分為交流分量占主導(dǎo)的"交流區(qū)",交、直流分量比例相當(dāng)?shù)?混合過渡區(qū)"以及直流分量占主導(dǎo)的"直流區(qū)",為保證地面交、直流分量"錯峰"布置,兩回交流線路應(yīng)采用垂直或倒三角排布方式,此時導(dǎo)線最小對地高度按照交流線路單獨運行時的情況設(shè)計即可。當(dāng)交流為750 kV線路時,走廊寬度主要由交流電場控制;交流為330 kV線路時,走廊寬度則由交直流電場分量共同控制。最終推薦采用垂直排布的相序6和倒三角排布的相序4兩種布置方式。
[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.
【作者單位】： 國網(wǎng)北京經(jīng)濟(jì)技術(shù)研究院;電力系統(tǒng)及發(fā)電設(shè)備控制和仿真國家重點實驗室(清華大學(xué)電機(jī)系);
【基金】：國家電網(wǎng)公司科技項目(SGTJ0000KXJS1 400081)~~
【分類號】：TM75
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本文編號：2036391