Abstract:

As a common disaster on transmission lines， ice disaster affects the safe operation of the power system seriously. A digital twin system for ice shedding of overhead transmission lines was designed and implemented to meet the precise mapping and real-time communication and visualization presentation requirements of de-icing vibrations of actual transmission lines. Firstly， the idea of real-time mapping of physical information was introduced， and the overall framework of the transmission line de-icing digital twin system was built based on the Unity3D platform. Then， an analytical solution based iterative model during any time period was established and solved， and the iterative model was combined with the measured time-varying parameters for segmented iterative correction， so as to complete modeling of the digital twin model. At the same time， the calculated twin data were displayed on the twin interaction platform for transmission line de-icing vibrations. Finally， this system was applied to simulate successive three levels of conductor ice shedding to verify the effectiveness of the model. Experimental results show that the results calculated by the twin model are highly consistent with the actual measurements， and the Mean Absolute Percentage Error （MAPE） of the twin model system is within 0.5%. It can be seen that the proposed method can establish an accurate model that reflects the operating status of the transmission lines.

Key words: transmission line, ice shedding, digital twin model, time series segmentation, analytical solution, successive three levels of line, simulation analysis

摘要：

冰灾作为输电线路常见灾害，会严重影响电力系统的安全运行。针对实际线路脱冰振荡对精准映射、实时通信和可视化呈现的需求，设计并实现了一个架空输电线路脱冰数字孪生系统。首先，引入物理信息实时映射的思想，并依托Unity3D平台搭建线路脱冰数字孪生系统整体框架。其次，建立并求解基于解析解的任意时间段内的迭代模型，并将迭代模型与测量得到的时变参数结合进行分段迭代修正，从而完成数字孪生模型的建模；同时，将计算出的孪生数据在线路脱冰振荡孪生交互平台上进行展示。最后，将该系统应用在连续三档导线脱冰模拟上以验证模型的有效性。实验结果表明：通过孪生模型计算的结果和真实测量值吻合度较高，孪生模型的平均绝对百分比误差（MAPE）在0.5%以内。可见，该方法可以建立准确反映线路运行状态的模型。

关键词: 输电线路, 脱冰, 数字孪生模型, 时间序列分段, 解析解, 连续三档线路, 仿真分析