特高压直流输电线路电磁环境的预测研究

发布时间：2018-01-06 14:32

本文关键词：特高压直流输电线路电磁环境的预测研究　出处：《郑州大学》2015年硕士论文　论文类型：学位论文

【摘要】：特高压直流(Ultra High Voltage Direct Current,UHVDC)输电线路以其独特的优点在建设特高压电网战略中发挥着日益重要的作用。然而它带来的电磁环境问题已经成为制约其发展的重要因素。评估UHVDC电磁环境的参数有:合成电场、离子流密度、无线电干扰及可听噪声。在计算单极输电线路的电磁环境时,本文主要计算了合成电场和离子流密度。其中合成电场与导线表面电场和标称电场相关,因此首先需要计算导线表面电场和标称电场。本文选用模拟电荷法,首次提出导线表面最大电场相对误差的判断依据,在此基础上对传统模拟电荷法中模拟电荷的位置和个数进行优化。本文采用优化后的模拟电荷法详细分析了分裂导线数、子导线分裂间距、子导线横截面积及导线对地高度等因素对导线表面电场和标称电场的影响,得出通过合理调整导线结构参数可以有效减小二者大小。在计算单极线路的合成电场和离子流密度方面,本文采用解析法详细分析了子导线分裂间距、子导线横截面积及导线对地高度等参数的影响,并给出指导工程实践的有效结论。在计算双极输电线路的电磁环境时,主要计算了双极形式下的合成电场、离子流密度、无线电干扰及可听噪声。首先对双极形式下的表面电场和标称电场采用优化后的模拟电荷法进行了研究分析。在计算双极线路的合成电场和离子流密度方面,本文采用解析法详细分析了子导线分裂间距、子导线横截面积、导线对地高度及极导线间距等参数的影响,并对输电线路的选取和架设提出了合理的参考依据。在计算无线电干扰和可听噪声方面,本文采用EPRI推荐公式进行计算仿真,描述了二者的衰减特性,得出减小电磁环境影响的措施。为了验证预测方法的正确性和合理性,本文将预测结果与±800k V哈密-郑州输电工程的实测数据进行比较,并对二者误差进行合理分析。在以上研究基础上,本文采用Visual Studio与MATLAB相结合的方式编制了UHVDC电磁环境预测软件,以便对UHVDC输电线路的电磁环境进行较为直观的预测和分析,为今后的环评工作提供有力的软件和理论支撑。
[Abstract]:Ultra High Voltage Direct Current. UHVDC). Transmission line plays an increasingly important role in the strategy of building UHV power network with its unique advantages. However, the electromagnetic environmental problems it brings have become an important factor restricting its development. The evaluation of UHVDC electromagnetic loop has become an important factor in its development. The parameters of the boundary are:. Synthetic electric field. Ion current density, radio interference and audible noise. In calculating the electromagnetic environment of a unipolar transmission line. In this paper, the synthetic electric field and ion current density are mainly calculated. The synthetic electric field is related to the surface electric field and the nominal electric field, so it is necessary to calculate the surface electric field and the nominal electric field. In this paper, the simulated charge method is used. The relative error of the maximum electric field on the surface of the conductor is judged for the first time. On this basis, the position and number of simulated charges in the traditional analog charge method are optimized. The number of split conductors and the splitting distance between sub-conductors are analyzed in detail by the optimized simulated charge method. The influence of sub-conductor cross section area and wire height on surface electric field and nominal electric field of conductor. It is concluded that reasonable adjustment of traverse structure parameters can effectively reduce the size of the two. In calculating the synthetic electric field and ion current density of unipolar lines, the splitting distance of sub-conductors is analyzed in detail by analytical method. The influence of the cross-sectional area of the sub-conductor and the conductor on the ground height is given, and the effective conclusions guiding the engineering practice are given. In the calculation of the electromagnetic environment of the bipolar transmission line, the synthetic electric field in the bipolar form is mainly calculated. Ion current density. Radio interference and audible noise. Firstly, the surface electric field and nominal electric field in bipolar form are studied and analyzed by the optimized simulated charge method. The synthetic electric field and ion current density of bipolar circuit are calculated. In this paper, the effect of splitting distance, cross sectional area, wire on ground height and polar wire spacing is analyzed in detail by analytical method. In the aspect of calculating radio interference and audible noise, the EPRI formula is used to calculate and simulate, and the attenuation characteristics of the two methods are described. In order to verify the correctness and rationality of the prediction method, the prediction results are compared with the measured data of 卤800kV Hami Zhengzhou transmission project. On the basis of the above research, this paper uses Visual Studio and MATLAB to compile the UHVDC electromagnetic environment prediction software. In order to predict and analyze the electromagnetic environment of UHVDC transmission line intuitively, it can provide powerful software and theory support for the future EIA work.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM75;TM721.1

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