±800 kV昆柳龙直流线路感应电特性的仿真研究

Simulation Study on Inductive Characteristics of±800 kV Kunliulong DC Line

当±800 kV新东直流正常运行时,±800 kV昆柳龙线路与其部分线段并行,昆柳龙线路感应电压远远高于其他直流线路感应电压。文中利用有限元仿真软件建立新东直流和昆柳龙直流并行线段的二维仿真计算模型,仿真了新东直流输电线路带电运行情况下昆柳龙直流线路的感应电压特性。结果表明:柳北站—龙门站线路在静电场单独作用下,正极感应电压为6 kV,负极感应电压12 kV;在静电场与离子流场的合成电场作用下,正极感应电压为20.7 kV,负极感应电压30.5 kV,这与实际测量结果最高感应电压为42 kV较为接近,说明离子流场作用是邻近线路产生感应电的主要因素。

±800 kV Kunliulong DC line is parallel to±800 kV Xindong DC line in normal operation,which makes the Kunliulong line have induced voltage when it is not in operation.In this paper,the finite element simulation software is used to establish the two-dimensional simulation calculation model of Xindong DC and kunliulong DC parallel line section,and the induced voltage characteristics of kunliulong DC line under live operation of Xindong DC transmission line are simulated.The induced voltage distributions of the Kunliulong DC line generated by the Xindong DC transmission line were simulated in the cases of the electrostatic field and the combined field of electrostatic field and ion flow field,respectively.The results show that in the electrostatic,the induced voltage on the positive line of the Liubei-Longmen line was 6 kV,and the induced voltage on the other negative line was 12 kV.In the combined field of electrostatic field and ion flow field,the induced voltage on the positive line was 20.7 kV,and the induced voltage on the other negative line was 30.5 kV.The latter simulated result was more closed to the actual measurement results,which shows that the ion flow field is the main factor affecting the induced voltage on the adjacent DC lines.