高压交流及交直流并行输电线路电磁环境研究

发布时间：2018-06-18 11:16

本文选题：特高压 + 交流　；参考：《中国矿业大学》2017年硕士论文

【摘要】：电磁环境是“存在于给定场所的所有电磁现象的总和”,电磁环境的主要影响因素是电磁辐射,电磁辐射的影响主要表现在:对人健康方面的危害和对电气设备造成电磁干扰。目前,特高压的不断发展以及线路共用走廊、靠近居民区等情况的出现,导致电磁干扰问题越来越严重,所以有必要对特高压输电线路产生的电磁环境进行研究。通过比较MATLAB编程计算和CDEGS仿真的结果,验证CDEGS模型的正确性。本文利用CDEGS的模型,研究在不同线路结构、导线参数、天气条件和海拔高度情况下,地面以上1.5m处电磁场、无线电干扰与可听噪声的变化规律。并在此基础上仿真特高压线路正常运行时对管道的电磁干扰,改变管道与线路的相对位置,如不同水平间距、交叉角度、不对称交叉和小角度变大角度交叉等,以及管道存在多个破损点时,分析管道上感应电压与电流的分布规律。同时,当输电线路发生单相接地故障时,改变杆塔档距和接地电阻,研究杆塔电压和电流及管道电压和电流的分布规律。根据仿真结果,提出适当防护措施。建立了特高压交流与超高压交流输电线路并行模型,研究不同线路布置,如单-单、单-双、双-单、双-双、不同线路间距和输电线路交叉时,电磁环境的变化规律,并在此模型基础上研究线路对管道的电磁影响,分析管线并行与交叉情况下,改变管道与线路的水平间距和交叉角度,管道所受电磁干扰的变化。对比MATLAB理论计算与CDEGS仿真的结果,得出使用CDEGS更接近实际,仿真交直流并行输电线路的电磁环境及对管道的电磁干扰,改变相关参数,例如:交直流线路间距、直流线路极间距、交直流导线参数,研究电磁环境的变化情况。并对交直流并行输电线路的电磁环境进行优化,如交直流并行的不同实现方式、架设耦合地线,通过仿真寻找最优的电磁环境优化方法。
[Abstract]:Electromagnetic environment is the sum of all electromagnetic phenomena existing in a given place. The main influence factor of electromagnetic environment is electromagnetic radiation. The influence of electromagnetic radiation is mainly manifested in: harm to human health and electromagnetic interference to electrical equipment. At present, with the development of UHV and the emergence of common corridor and close to residential area, the problem of EMI is becoming more and more serious, so it is necessary to study the electromagnetic environment of UHV transmission line. The correctness of CDEGS model is verified by comparing the results of MATLAB programming and CDEGS simulation. Using the model of CDEGS, the variation of electromagnetic field, radio interference and audible noise at 1.5 m above ground is studied under different circuit structure, wire parameters, weather conditions and altitude. On this basis, the electromagnetic interference of UHV line to pipeline is simulated, and the relative position of pipeline and line is changed, such as different horizontal spacing, cross angle, asymmetric cross and small angle increasing angle, etc. And the distribution law of inductive voltage and current on pipeline is analyzed when there are many damaged points. At the same time, the distribution of tower voltage and current and pipeline voltage and current are studied by changing tower spacing and grounding resistance when single-phase grounding fault occurs on transmission line. According to the simulation results, the appropriate protective measures are put forward. A parallel model of UHV AC and UHV AC transmission lines is established to study the variation of electromagnetic environment when different lines are arranged, such as single, single double, double single, double, different line spacing and transmission line crossing. On the basis of this model, the electromagnetic effect of pipeline on pipeline is studied, and the variation of electromagnetic interference on pipeline is analyzed by changing the horizontal distance and crossing angle between pipeline and line under the condition of pipeline parallel and crossing. Comparing with the results of MATLAB theory calculation and CDEGS simulation, it is concluded that the use of CDEGS is closer to reality, the electromagnetic environment of AC / DC parallel transmission lines and the electromagnetic interference to pipelines are simulated, and the relevant parameters are changed, such as the distance between AC and DC lines, The distance between the poles of DC lines, the parameters of AC and DC conductors, and the variation of electromagnetic environment are studied. The electromagnetic environment of AC / DC parallel transmission lines is optimized, such as the different realization modes of AC / DC parallelism, the erection of coupled ground wires, and the optimization of electromagnetic environment by simulation.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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