高海拔地区±500 kV直流线路电磁环境试验研究及导线选型  

Experimental Research and Conductor Selection on Electromagnetic Environment of ±500 kV DC Transmission Line at High Altitude

作　　者：赵录兴 小布穷 王炳强 岳嵩 高磊 ZHAO Luxing;XIAO Buqiong;WANG Bingqiang;YUE Song;GAO Lei(China Electric Power Research Institute,Haidian District,Beijing 100192,China;Electric Power Research Institute of State Grid Tibet Electric Power Co.,Ltd.,Lhasa 850010,Tibet Autonomous Region,China;Economic and Technology Research Institute of State Grid Tibet Electric Power Co.,Ltd.,Lhasa 850004,Tibet Autonomous Region,China)

机构地区：[1]中国电力科学研究院有限公司,北京市海淀区100192 [2]国网西藏电力有限公司电力科学研究院,西藏自治区拉萨市850010 [3]国网西藏电力有限公司经济技术研究院,西藏自治区拉萨市850004

出　　处：《电网技术》2021年第2期794-801,共8页Power System Technology

基　　金：国家电网公司科技项目“高海拔±800kV直流输电线路电磁环境预控技术研究”(GYB17201600148)。

摘　　要：直流输电线路电磁环境与环境保护和工程投资密切相关,尤其在高海拔地区,电磁环境已成为决定导线型式和线路结构参数的关键技术问题。文章利用位于海拔4300 m的西藏羊八井高海拔试验线段,对±500 kV直流输电线路采用6×300和4×500 mm^(2)导线时的地面合成电场、可听噪声与无线电干扰开展了长期试验研究。通过统计分析,获得高海拔地区±500 kV直流线路电磁环境水平及分布规律。通过与低海拔计算结果的对比分析,获得±500 kV直流线路电磁环境的海拔修正量,并讨论了美国EPRI推荐的电磁环境海拔修正方法的适用性。试验结果表明,±500 kV直流线路在海拔4300 m地区采用6×300和4×500 mm^(2)导线,电磁环境均可满足标准限值要求,其中4×500mm^(2)导线水平荷载更小,有利于降低杆塔重量;从海拔0到4300 m,±500 kV直流线路可听噪声和无线电干扰增加量约为3.4 dB和10~13 dB,分别为按美国EPRI推荐方法得到的修正量的24%和70%~90%。The electromagnetic environment of HVDC transmission lines keeps a close relationship with the environment protection and the project cost, especially at high altitude area, it has become a key technical factor which decides conductor types and transmission line parameters. In this paper, a long-term experimental study is carried out on the ground total electric field, the audible noise and the radio interference of ±500 kV DC transmission line with 6× 300 mm^(2) and 4× 500 mm^(2) conductors by using the test line at altitude 4300 m in Yangbajing area, Tibet. The statistical analysis provides us with the electromagnetic environment level and the distribution of ±500 kV DC transmission line at the altitude 4300 m. Compared with the results of the low altitude calculation, the electromagnetic environment altitude correction of ±500 kV transmission line is obtained, and the applicability of the altitude correction method recommended by EPRI is also discussed. The test results show that when the ±500 kV DC transmission line adopts 6× 300 mm^(2) and 4× 500 mm^(2) conductors, the electromagnetic environment meets well the standard requirement limits: of which the horizontal load with 4× 500 mm^(2) conductors is smaller and helpful in reducing the weight of towers. The incensement of the audible noise and the radio interference of ±500 kV DC transmission line are 3.4 dB and 10-13 dB respectively, which are only about 24% and 70-90% of the values recommended by EPRI.

关 键 词：±500 kV 直流输电线路 电磁环境 合成电场 可听噪声 无线电干扰 高海拔 

分 类 号：TM721[电气工程—电力系统及自动化]