输电塔-线体系舞动仿真及控制研究

Simulation and control for galloping of a transmission tower-line system

舞动是输电线高频低幅的自激振动,基于ANSYS建立了输电塔-导地线-绝缘串的塔线耦合体系非线性有限元模型,提出了采用重启动技术进行覆冰导线的水平、竖向、扭转三方向舞动分析,并通过经典算例验证了此新方法的可行性;进行不同风速工况下输电塔-线耦合体系的舞动仿真,得到了体系舞动振幅和输电塔动力响应。同时针对典型工况,进行了相间间隔棒及多点压重防舞措施的舞动控制分析,并对不同布置方案的舞动控制效果进行了比较,确定了有效舞动控制方案。

Galloping of overhead transmission conductors is a low-frequency, high-amplitude self-induced vibration. A coupled transmission tower-cable-insulator system model was established based on ANSYS finite element soft-ware here. The vertical, horizontal and torsional gallopings of the transmission conductors were analyzed in detail using the restarting technology and the feasibility of the restarting technology was verified with a typical example. Under the condition of different wind velocities, the galloping analysis was performed and the galloping amplitudes of the tower-cable coupled system and the dynamic responses of the towers were obtained. Different galloping control measures including inter-spacers and multi-point loading were employed. Various layout projects of the galloping control measures were compared it was shown that adding loading is a good measure for galloping control, the multi-point loading is better than the single point loading, and increment of loading in an appropriate range is conducive to anti-galloping.