【作者】 杨小玲；

【导师】 唐立军； 彭继文；

【作者基本信息】 长沙理工大学 ， 电子科学与技术， 2015， 硕士

【摘要】 随着高压、特高直流输电工程建设越来越多,不可避免会出现线路并行及交叉跨越的情况。并行高压/特高压直流输电线路合成场强分布规律对于高压、特高直流输电工程建设和电磁环境评价有重要意义,但目前这方面的研究很少,现场试验数据缺乏。本文着重探索并行高压/特高压直流输电线路地面合成场强分布规律,为工程应用和电磁环境评估提供一定的参考。本文详细介绍了基于Deutsch假设分析直流输电线路合成场强的解析计算方法,推导了适用于并行直流输电线路合成场强计算的解析公式,编写了适用于任意回路直流线路合成场强计算的matlab通用计算程序。利用所编制的matlab计算程序对某实际并行特高压直流输电线路地面合成场强进行了模拟计算,并对该并行线路的地面合成场强进行了现场实测,实测结果与模拟结果相符,验证了算法与程序的实用性和准确性。利用所编制的matlab程序进一步分析了不同极导线排列模式、不同线路间距、不同线路高度、不同电压等级、不同运行方式等条件下特高压、并行双回特高压直流输电线路下地面合成场强的分布特性,模拟结果表明,双回直流线路并行时,由于空间正负离子流的相互影响作用,其场强分布与导线排列方式有较大关系,两回路线路内侧极性相同时,并行线路之间区域合成场强较单回增加,内侧极性相反时,并行线路之间区域场强较单回减小;同时,随着两回线路之间距离的减小,或线路高度的增加,与单回路相比,线路中间区域合成场强增加或减小幅度增大,但两回路线路外侧合成场强与单回线路基本相同;不同电压等级并行线路与相同电压等级并行线路地面合成场的分布主要在对称性上有所差异,但总体规律基本不变。更多还原

【Abstract】 With the construction of ultra-high direct current power transmission, more and more unavoidable situation of parallel and cross-cutting line will appear. For now, the field strength distribution of single-circuit HVDC lines, at home and abroad have been carried out more research, but few studies on these issues, and the lack of data to support field trials. Therefore,the existing conclusions can not accurately evaluate the parallel high / ultra-high voltage direct current transmission line field strength to provide technical guidance has use value engineering.This paper investigates the analytic calculation method for the synthesis field strength of DC transmission line based on Deutsch assumption, analytical formula calculation of field intensity suitable for DC transmission lines in parallel is deduced, general computing programs are composed using matlab which applied to any circuit DC circuit synthesis field strength calculation. The calculation of the synthesis field intensity of a practical parallel UHV DC transmission lines is simulated based on the programs mentioned above, and the synthesis field intensity of ground under the parallel line is measured on site. Based on the works above, the measured results are found in conformity with the simulation results which verify the practicability and accuracy of the algorithm and programs. Analysis of parallel high/ ultra-high voltage direct current transmission line synthesis field with different poles arranged mode, different lines spacing, different lines heights, different voltage levels and different ways to run. The results showed that due to the mutual influence of positive and negative ions flow space, the field distribution of two paralleled HVDC lines has a larger relationship with the conductor arrangement. When the two-circuit lines have the same polarity, the regional field strength between the parallel increase over a single return line, the inside of the opposite polarity, the area between the parallel lines back to reduce the field strength than single. Meanwhile, with decreasing distance between the two back lines, or line height increases, compared with single-circuit line in the middle region of the resultant field strength increases or decreases the magnitude of the increase, but the two lines outside of the loop field strength and single back line is basically the same. Different voltage levels parallel lines parallel lines with the same voltage level ground synthetic field distribution mainly differ in symmetry, but the overall law basically unchanged. And in the vicinity of the existing DC line corridor when the new addition of a DC line, The minimum height of the line on the ground should be "+o-o" on the ground synthetic field accounting which to meet the currentstandard field strength limits.更多还原