【作者】 胡白雪；

【导师】 周浩；

【作者基本信息】 浙江大学 ， 电力系统及其自动化， 2006， 硕士

【摘要】 目前我国的电网结构,已经不能满足我国国民经济快速发展所需要的电力供应,另外我国能源资源和负荷分布的特点也决定了我国势必要建设远距离、大容量的特高压输电系统。根据国网建设有限公司的规划,近几年内将建设1000kV特高压输电线路。随着全球经济的不断发展和民众环境意识的增强,输电工程的电磁环境问题越来越受到人们的关注。同时,电压等级发展到了特高压阶段,电磁环境已经成为决定输电线路结构、影响建设费用等的重要因素。本文就交流超高压及特高压输电线路电磁环境问题进行了研究。 输电线路的电磁环境参数主要包括工频电场、工频磁场、无线电干扰和可听噪声四个方面。本文利用加拿大SES公司出品的CDEGS软件包对交流超高压以及特高压输电线路就这四个方面进行了详细的仿真研究。针对每个电磁环境参数,分别介绍了其理论计算方法、主要影响因素、降低措施以及相关标准等,并对工频电磁场的生态效应进行了阐述。本文着重研究了特高压输电线路的工频电磁场降低措施,并提出了在特高压输电线路下方架设屏蔽线和架设低压输电线路来降低输电线路下方工频电磁场的方法,并对其进行了详尽的仿真。仿真结果表明:在相导线与地面之间安装几根屏蔽线可以明显减小输电线路下方的电磁场。而在特高压输电线路下方架设低压线路如220kV线路也可以大大减小输电线路下方的工频电磁场,甚至比前一种方法效果更好,这种方法可以节省输电走廊、节约土地。对于无线电干扰和可听噪声,目前国内外通过特高压线路试验所得结果都小于限值,并认为和已有的超高压输电线路水平相当。分裂根数和子导线截面积对无线电干扰和可听噪声的影响较大,可以通过增多分裂根数和加大子导线截面积来进一步减小特高压无线电干扰和可听噪声水平。更多还原

【Abstract】 Nowadays, the power system structure of our country cannot supply enough power for our country’s economic development, and the distribution of energy resource and load determine that we have to construct long distance, great capability UHV transmission line. With the global economic development and people’s increasing environment awareness, the electromagnetic environmental problem caused by power transmission is paid more and more attention. At the same time, as the voltage rating turn into UHV level, electromagnetic environment has become the critical factor which determines the power transmission line’s structure and the constructing cost. This paper focuses on the electromagnetic environmental problem of AC EHV and UHV transmission lines.The electromagnetic parameter of power transmission include: power frequency electrical field, power frequency magnetic field, radio inference (RI) and audible noise (AN). With Canadian SES’s CDEGS software, this paper makes detail simulation research on the four electromagnetic parameter of AC EHV and UHV transmission line. This paper introduces theoretical calculation method, main affected factor, mitigation technology and their standards for each electromagnetic environment parameter, and the ecology effect of the power frequency electromagnetic field is also discussed. This paper emphasizes on the mitigation method of the power frequency electromagnetic field of UHV transmission line, and put forward that installing shield wires or lower voltage transmission lines under the phase lines to reduce the power frequency electromagnetic field of UHV transmission line, and then make the simulation of it. The result of simulation shows that, installing several shield wires under the phase lines can obviously reduce the power frequency electromagnetic filed of transmission line. And installing lower voltage transmission lines, such as 220kV lines, beneath the phase lines can also reduce the power frequency electromagnetic filed greatly, and it is even better than the first one, this method can save the transmission corridor and land resource.As to the radio inference (RI) and audible noise (AN) of UHV transmission lines, the experimental results done at home and abroad show that the level of RI and AN is comparable with that of EHV. The number of split conductors and the section ofsubconductor have a influence on the RI and AN of UHV transmission line, and increasing the number of subconductors and select larger section conductor can both reduce the level of RI and AN.更多还原