输电线路导线覆冰扭转特性的数值模拟

Numerical Simulation of Torsion Characteristics of Transmission Line Conductor

输电线路导线覆冰是电力系统最严重的自然灾害之一,研究导线覆冰的数值计算方法,建立仿真平台,不仅可以科学地预测导线覆冰增长,并且能大量减少自然覆冰观测工作量。但是已有的数学模型和仿真计算方法都回避了导线覆冰扭转这一自然现象,从而不能有效模拟实际覆冰增长。该文基于导线覆冰形成机理,加入导线覆冰扭转因素,提出导线扭转的数学模型,借助C语言编写仿真模拟程序,实现导线覆冰动态增长的数值模拟过程。仿真结果表明,导线覆冰增长是一个伴随扭转的动态过程,距离杆塔距离、档距、风速、液态水滴直径大小均对扭转角度大小有影响。在重庆大学雪峰山自然覆冰试验基地,验证了该文所提出的数值模拟方法的科学性。

Conductor icing of overhead transmission line is one of the most serious natural disasters in power systems.Studying the numerical simulation method of conductor icing and establishing a simulation platform can not only predict the growth of conductor icing scientifically,but also greatly reduce the work of field observation.However,the existing mathematical models and simulation calculation methods all ignore the torsion of conductor in icing process,so the actual ice accretion process cannot be simulated accurately and effectively.In this paper,based on the formation mechanism of conductor icing,the twisting factor is taken into account,and then the mathematical model of conductor torsion is proposed.Meanwhile,the simulation program is written by C language to realize the numerical simulation process of dynamic conductor icing growth.The simulation results show that the conductor icing growth is a dynamic process with torsion.At the same time,the distance from the tower,the span,the wind speed,and the diameter of the liquid droplets all have great influence on the torsion angle.The numerical simulation method proposed is verified at the Xuefeng-mountain Natural Icing Test Base of Chongqing University.