基于上流有限元法的同走廊两回±800kV直流线路地面合成电场计算  

Calculation of Total Electric Field at the Ground Level Under Double-Circuit ±800 kV DC Transmission Lines Arranged on Same Corridor With Upstream FEM Method

作　　者：杨扬[1] 陆家榆[2] 杨勇[2] 

机构地区：[1]宁波电业局 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2012年第4期22-27,共6页Power System Technology

基　　金：国家自然科学基金项目(50907062;51037001)~~

摘　　要：为提高单位走廊输电能力,我国向家坝—上海与锦屏—苏南两回±800 kV直流线路采用同走廊架设。两回±800 kV直流线路同走廊架设在世界上无工程应用先例,需要对其地面合成电场进行研究,以满足工程设计和环境保护需求。文中提出了一种基于上流有限元法的同走廊两回直流线路地面合成电场计算方法,模拟试验线段试验结果验证了计算方法的有效性。计算和试验结果都表明:不同的极导线布置方案不会显著影响地面最大合成电场的大小,但会影响其分布位置;同走廊两回直流线路地面最大合成电场的绝对值与单回直流线路的差别不大。最后对向家坝—上海与锦屏—苏南同走廊两回±800 kV直流线路的地面合成电场进行计算分析。To increase power transmission capability of unit corridor, the double-circuit ±800 kV DC transmission lines, one of which is from Xiangjiaba to Shanghai and the other of which is from Jinping to Sunan, are arranged on the same corridor. There is not the precedent of engineering application of such a project in the world, so the ground total electric field under the transmission lines is to be researched to meet the demand from both engineering design and environmental protection. An upper stream finite element method （FEM） based method to calculate the ground total electric field strength under the double-circuit ±800 kV DC transmission lines arranged on the same corridor is proposed and the effectiveness of the proposed calculation method is verified by the test results of the analogue testing line. Both results from calculation and tests show that different arrange schemes of polar conductors of the double circuit DC transmission lines arranged on the same corridor do not evidently influence on the magnitude of ground total electric field strength, however the distribution of the ground total electric field is influenced; there is not obvious difference between the absolute value of the maximum ground total electric field strength of the double circuit transmission lines arranged on the same corridor and that of the single circuit transmission line. Finally, the ground total electric field strengths of the double-circuit ±800 kV DC transmission lines arranged on the same corridor are calculated and analyzed.

关 键 词：特高压直流输电 同走廊 两回直流线路 上流有限元 模拟试验 合成场强 

分 类 号：TM15[电气工程—电工理论与新技术]