冰冻灾害条件下集电线路塔架稳定性数值模拟研究

Numerical Simulation Study on Stability of Transmission LineTower Under Freezing Disaster Condition

我国陆上风电场大部分在华北和西北地区,冬季雨雪等恶劣天气较多,集电线路会出现覆冰现象,导致集电线路塔受力增大,可能发生倒塌。因此,研究线路覆冰条件下塔架稳定性对陆上风场的正常运营有着重要意义。本文依托内蒙古锡林浩特市某陆上风电项目,建立集电线路塔架ABAQUS数值模型,开展电缆覆冰荷载对集电线路塔架稳定性数值模拟研究,得到如下结论:(1)在仅受到输电导线自重时,塔架水平位移最大为22.9 mm;塔架与输电导线连接点处向下位移为6.53 mm。(2)极端覆冰荷载条件下,5号节点为最危险点,计算轴应力为46.24 MPa,相较于无覆冰荷载分别增大了66.7%。(3)极端覆冰荷载条件下,塔架水平位移最大为46.2 mm,相较于无覆冰荷载增大了101.7%。

Most of China's onshore wind farms are located in North China and Northwest China.In winter,there are many bad weather such as rain and snow,so the collecting line will be covered with ice,which will increase the force of the collecting line tower and may collapse.Therefore,it is of great significance to study the stability of the tower under the ice-covered condition for the normal operation of the onshore wind farm.Based on a land wind power project in Xilin Hot,Inner Mongolia,the ABAQUS numerical model of transmission line tower was established,and the numerical simulation of cable ice load on the stability of transmission line tower was carried out.The following conclusions were obtained:(1)The maximum horizontal displacement of the tower is 22.9 mm when only the dead weight of the transmission wire is affected.The downward displacement at the connection point between the tower and the transmission wire is 6.53 mm.(2)Under extreme ice loading,node No.5 is the most dangerous point,and the calculated axial stress is 46.24 MPa,respectively increasing by 66.7%compared with the non-ice loading.(3)Under extreme ice loading,the maximum horizontal displacement of the tower is 46.2 mm,which increases by 101.7%compared with that without ice loading.