±800kV云广特高压直流线路合成电场仿真计算与测试分析

Simulative calculation and measurement analysis of total electric field for ± 800kV Yunnan-Guangzhou UHVDC transmission lines

为研究实际运行特高压直流输电线路复杂环境的合成电场特性及环境影响,开展±800 kV云广直流线路合成电场测量与分析。建立了特高压直流输电线路合成电场计算模型及算法流程,阐述了特高压直流输电线路合成电场的测量仪器、环境、位置、数据记录和处理方法。不同运行方式下的测试结果表明:正极半压和负极全压下测量值与理论值的误差小于负极全压运行下的误差,但大于双极全压运行下测量值与理论值的误差;因测试点的海拔高度、导线对地高度、温/湿度、风速、风向等因素影响,负极半压、正极半压和负极全压、负极全压运行的合成电场值上下浮动于不同月份的双极全压测量值;不同测试点的合成电场的80%值和95%值对应的测量位置基本相同,同时所有测量结果满足合成电场环境限值且有足够的裕度。云广直流工程的电磁环境设计合理性得到了验证。

The total electric field of ± 800 kV Yunnan-Guangzhou DC lines is measured and analyzed for studying the total electric field characteristics and environmental effect of UHVDC lines. The calculation model of UHVDC total electric field and its algorithm are proposed. The measuring instruments,environment and location,as well as the data record and its processing method,are introduced. The data measured in different operating modes show that,the difference between the theoretical value and the value measured in the mode of half positive pole voltage full negative pole voltage is less than that in the mode of full negative pole voltage but greater than that in the mode of full positive pole voltage full negative pole;with the influences of altitude,line-ground height,temperature,humidity,wind speed,wind direction,etc.,the total electric field measured in the mode of half negative pole voltage,in the mode of half positive pole voltage full negative pole voltage or in the mode full negative pole voltage is different from the value measured in the mode of full positive pole voltage full negative pole for different months;the measuring location of 80 % value and that of 95 % value are nearly same for all test points,and all the measured data meet,with sufficient margin,the environmental limits relating to the total electric field. The rationality of electromagnetic environment design for Yunnan-Guangzhou DC project is verified.