点云数据温度变化环境下输电线形态模拟

Shape simulation for a transmission line under different temperatures based on point cloud data

气温是影响架空输电线路电气间距和机械强度的主要气象参数之一。针对当前输电线路实时工况运营状态安全监测的需求,基于机载激光点云数据,提出了一种线路环境温度变化下架空输电线空间形态模拟及精度验证方法。首先利用点云数据重建输电线空间模型并提取初始温度下输电线水平应力,然后根据状态方程求解模拟温度下输电线水平应力。最后根据静力平衡原理实现输电线空间形态模拟,并提出了两期激光点云交叉验证方法验证模拟结果的可靠性和准确性。选择具有典型代表性的输电线点云数据进行试验,结果表明:该方法能很好地实现任意温度变化环境下架空输电线空间形态模拟,模拟中误差0.027,平均误差0.066 m,最大误差0.471 m。研究为机载激光雷达电力巡检及高压输电线路设计提供参考价值。

Air temperature is one of the main meteorological parameters that affect the electrical distance and mechanical strength of overhead transmission lines.Given the need for real-time operation state safety monitoring of overhead transmission lines,a method of spatial shape simulation and accuracy verification of the lines under environmental temperature changes is proposed.It is based on airborne LiDAR point cloud.First,the spatial model of a transmission line is constructed using point cloud,and the horizontal stress of the transmission line at the initial temperature is extracted.Then,the horizontal stress of the line under simulated temperatures is solved according to the state equation.Finally,the spatial shape simulation of a transmission line is realized according to the principle of static balance.A two-phase cross validation method of excitation point cloud is proposed to verify the reliability and accuracy of the simulation results.The typical point cloud data of transmission lines are selected for test.The results show that the method can well simulate the spatial shape of overhead transmission lines under any temperature change environment.The simulation error is 0.027,the average error is 0.066 m,and the maximum error is 0.471 m.The research provides reference value for airborne LiDAR power inspection and high voltage transmission line design.