适用于有高差线路的覆冰输电导线ANSYS找形方法

摘要

Ice covering on the transmission line has great impact on power system security.Form-finding of transmission line is the basis for mechanical analysis of iced transmission line by ANSYS.Current form-finding methods end with the convergence of sag or the horizontal stress, which is hard to obtain in transmission lines with height difference while the maximum sag isn`t in the center position.Therefore, this paper presented a form-finding method of transmission lines consulting the lowest point.The method obtained the lowest point by analytic method first, then modified the elastic modulus for coming near the lowest point, and repeated the iteration until the line reaches the lowest point after changing the elastic modulus back to actual value.Simulation results show the effectiveness of the proposed method for different types of transmission lines.%输电线路覆冰会对电网运行产生严重影响,输电导线找形是基于ANSYS对覆冰输电线路进行力学分析的基础.现有ANSYS找形方法主要以跨中弧垂或导线水平应力收敛作为结束条件.对于有高差的输电线路,水平应力和最大弧垂并非在一档中间位置,跨中弧垂或水平应力的确定较为复杂.为此,文中提出基于最低点位置的输电导线找形方法.首先基于解析法求解导线最低点位置,对最低点不在档内的情况需要虚拟出最低点,再通过修改弹性模量的方式使导线位于接近最低点,然后将弹性模量修改为实际值,重复迭代直至导线到达最低点.仿真结果验证了文中方法对不同类型输电导线的有效性.