输电线路雷电绕击风险评估多源数据融合可视化方法

Multi-source Data Fusion Visualization Method for Transmission Line Lightning Shielding Failure Risk Evaluation

直观描述超/特高压输电线路的绕击风险分布,展现线路结构、地形地貌、雷电活动等复杂因素的交互关系具有重要的价值,相关研究亟待深化。该文开展了绕击风险评估多源数据融合可视化方法研究。基于输电通道点云数据、EGM模型参数、绕击闪络率等多源数据特征分析,借鉴“以数生智”认知过程,提出了一种数据融合3维可视化框架及关键技术。该方法采用“档距-导线-断面-计算点-暴露弧”层级数据结构,按层级关联整合不同维度表达需求的数据,基于输电通道激光雷达点云空间开展以暴露弧为载体的绕击风险机理可视化,实现绕击闪络率、屏蔽机理、雷电流幅值等多源信息的综合立体展示,通过支持对限定条件的响应,实现了绕击故障分析应用。某500 kV线路档距案例应用结果表明:融合可视化能够发挥3维视图多尺度、多视角的优势,通过暴露弧与点云数据的信息互补,从机理层面揭示避雷线、地面对导线的屏蔽作用,提升数据展示的全面性、直观性。

It is of great value to intuitively describe the distribution of shielding failure risk of extra/ultra high voltage transmission lines,and to demonstrate the interaction relationship between complex factors such as line structure,terrain,lightning activity,etc.Relevant research needs to be deepened urgently.This article conducts research on the visualization method of multi-source data fusion for shielding failure risk assessment.Based on the analysis of multi-source data features such as transmission channel point cloud data,EGM model parameters,and shielding failure flashover rate,and referring to the cognition process of“generating intelligence through data”,a data fusion 3D visualization framework and key technologies are proposed.This method adopts a hierarchical data structure of“span-wire-section-calculation point-exposed arc”,correlates and integrates data with different dimension requirement to express according to a hierarchical structure,and carries out the visualization of shielding failure risk mechanism with exposed arc as the carrier in the point cloud space of the transmission corridor,realize the comprehensive 3D display of multi-source information such as shielding failure flashover rate,shielding mechanism,lightning current peak,etc.By supporting responding to limited conditions,the application of shielding fault analysis is implemented.The application results of one 500 kV line span case show that the fusion visualization can exert the advantages of 3D views including multi-scale and multi-perspective.By complementing the information of exposed arcs and point cloud data,the shielding effect that the conductor receives from the lightning shield conductor and the ground can be revealed from a mechanistic perspective,improving the comprehensiveness and intuitiveness of data visualization.