Research On Overhead Transmission Line Project Cost Control Based On Principal Component Regression

As an important energy transmission channel in power system,the construction and maintenance of overhead transmission lines are very important for the development of power industry.Due to the characteristics of complex construction environment,long project cycle and high investment cost of overhead transmission line project,the project cost control is easily affected by multiple factors such as natural conditions and technical level,and the cost control of electric power project has become the primary issue concerned by many electric power construction units.In the past,people have solved this problem by using cost control methods and tools,such as traditional cost estimation methods,sensitivity analysis and regression models.However,these methods are often too simplified or not accurate enough to fully take into account the impact of various complex factors on project costs,resulting in poor cost control.Based on the in-depth analysis of the case of overhead transmission lines in Jiangxi Province,this paper establishes a cost influencing factor system of overhead transmission lines,and obtains a cost control index system covering 17 indicators according to the installation list of transmission lines.In addition,the principal component analysis method is used to reduce the dimension of the index,extract the two principal components of project tensioning tower and project tensioning ratio as the key indicators of cost control,establish the regression equation between each factor index and the project cost,and explore the relationship between each factor index and the project cost.Through the previous research,it is found that the seventeen indicators selected in this paper can be perfectly expressed by the two main components of "engineering tensioning tower" and "engineering tensioning ratio".Among the nine important indexes of the principal component,the double-loop linear tower and the path length have the greatest impact on the cost of the project.When formulating the project cost policy,we make the main countermeasures and suggestions from reducing the consumption of the two factors of the double-loop linear tower and the path length,which can effectively reduce the cost of the project.The two components of principal component two,"project tensile ratio",are negatively correlated with the project cost,which indicates that reasonable tensioning tower and tensioning ratio ratio in engineering projects will optimize the project cost to a certain extent.Finally,based on the previous research results,combined with the effect gradient of a number of indicators on project cost,this paper proposes countermeasures and suggestions for optimizing the project cost of overhead transmission lines from the perspective of specific project implementation measures,enterprises and policies.The results of this paper show that principal component regression can effectively explore the cost factors of overhead transmission line engineering projects,and provide a new idea and method for project management.