| The safety of overhead transmission lines is always an important factor to test the safety of power grids.Especially after the ultra high voltage transmission lines have realized the interconnection of large power grids,the safety of overhead transmission lines has risen to the height of national energy security.However,the distribution of overhead transmission lines presents a specific point with multiple areas and a complex geographical environment.In addition,in recent years,State Grid has implemented the management strategies of reducing cost and increasing efficiency,which leading an obvious shortage of front-line operators.In this case,it is difficult to realize lean management of overhead transmission lines.Meanwhile,the application of laser point cloud data in surveying and mapping field is on the way to maturity,which provides a new idea to solve the difficult problems of transmission lines.In order to solve the difficulties in actual operation and maintenance accordingly,the author focuses on the research on mining and application of laser-point cloud data for transmission lines,of which the key point is the method and effect of data processing which is more actual in the field of transmission lines.The main research work includes the following three points:(1)A method based on smooth segmentation of point cloud data processing for transmission lines is proposed.Firstly,point cloud data should be preprocessed,then the improved triangular network progressive encryption filtering algorithm based on smooth segmentation is applied to complete the point cloud filtering and realize the classification of ground and non-ground point data,finally,point cloud data of elements above ground are classified,attention in data classification of settlement places and mountains are raised based on experience,The data processing effect was tested in the point cloud data processing experiment of power transmission lines in Jinan.we get a good effect,especially the land and vegetation data effect is better than Terrasolid.(2)A modeling method of transmission line based on point cloud data is proposed.Firstly,the VFH feature description factor of point cloud data is used to construct the database of point cloud model by establishing kd-tree structure,then,the transmission tower and line are modeled through model-driven method,finally in the modeling experiment of transmission lines in Jinan,the modeling accuracy is verified.The error is proved less than 3%.(3)Research on two applications of point cloud data in transmission lines are proposed,which are automatic inspection and crossover survey.Firstly,route planning is realized by laser SLAM method,the best dilution ratio of data is for automatic inspection,the shooting specification is specified,the typical operation mode is put forward,as well as the safety distance standard.The precision of automatic inspection was inspected in Jinan.Secondly,a segmentation approximation method based on point cloud data is proposed in crossover survey,and the accuracy is tested and analyzed. |
