±500kV同塔三回柔性直流输电线路的电磁环境  

Study on Electromagnetic Environment of ±500 kV Triple-circuit Flexible DC Transmission Line on Same Tower

作　　者：马晓倩 何堃 谢莉 陆家榆 鞠勇 MA Xiaoqian;HE Kun;XIE Li;LU Jiayu;JU Yong(China Electric Power Research Institute,Haidian District,Beijing 100192,China;Department of Electrical Engineering,Tsinghua University,Haidian District,Beijing 100084,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]清华大学电机工程与应用电子技术系,北京市海淀区100084

出　　处：《电网技术》2020年第5期1978-1984,共7页Power System Technology

基　　金：国家电网公司科技项目(GY71-18-047):“500kV柔性直流线路同塔三回或与交流线路同塔双回设计应用研究”。

摘　　要：根据柔性直流电网多端友好接入和网络化的特点,以及走廊资源日趋紧张的现状,±500 kV同塔三回柔性直流线路需求日益迫切。在线路设计时,需要合理选择±500 kV同塔三回柔性直流输电线路的极导线排列方式和线路参数,以使线路的电磁环境满足环境保护要求。分别采用基于EPRI经验公式、CISPR经验公式以及叠加原理的可听噪声和无线电干扰计算方法,研究了同塔三回直流输电线路采用不同型号导线时的可听噪声和无线电干扰水平,确定了不同极导线排列方式下满足可听噪声和无线电干扰限值要求的最小导线。采用基于上流有限元法的合成电场数值算法计算分析了采用不同导线时同塔三回直流输电线路的地面合成电场,确定了不同极导线排列方式下满足地面合成电场限值要求的导线最小高度。针对在已有单回或双回直流线路上方增设双极直流线路使之变成同塔三回直流线路的工程需求,研究分析了增设前后直流线路电磁环境的变化规律,结果表明,选择合适的极导线排列方式,可使增设后形成的同塔三回直流线路的电磁环境满足限值要求。According to the characteristics of multi-terminal friendly access and networking of flexible DC power grid, and considering current situation of increasingly scarce corridor resources, it is urgent to construct ±500 kV flexible DC triple-circuit line on the same tower. To meet the requirements of environmental protection, it is necessary to reasonably select the operation mode and line parameters of ±500 kV flexible DC triple-circuit transmission lines on the same tower. By using EPRI and CISPR empirical formulas and superposition principle, the audible noise(AN) and radio interference(RI) for different conductor modes are studied, and then the minimum size conductor meeting the AN and RI limit requirements under different pole-conductor bundle arrangements are determined. The total electric field of ±500 kV flexible DC triple-circuit line on the same tower with different conductor arrangements are calculated and analyzed with the numerical algorithm based on upstream finite element method. Then, under different arrangement of polar conductors, the minimum line-to-ground distances satisfying the limits of total electric field are given. In view of the engineering requirement of adding the bipolar DC line to existing single or double-circuit DC line to make it a triple-circuit DC line on the same tower, the electromagnetic environment parameters before and after line addition is analyzed. It is found out that, under appropriate arrangement of pole-conductor bundles, the electromagnetic environment parameters of the new line can meet the requirements of environmental protection.

关 键 词：同塔三回直流输电线路 电磁环境 合成电场 可听噪声 无线电干扰 导线选型 导线最小高度 

分 类 号：TM14[电气工程—电工理论与新技术]