Analysis of radio interference influencing factors of high altitude HVDC transmission lines based on variable selection

The electromagnetic environment of transmission lines has an important influence on the HVDC transmission project. In high altitude environment, the problem of electromagnetic environment is more serious because the line corona discharge is more intense. In the traditional research, the electromagnetic environment test of DC line generally does not get a lot of long-term test data. On the other hand, previous methods for predicting the electromagnetic environment of HVDC transmission lines are not sophisticated enough to comprehensively consider the influence of various factors on the electromagnetic environment. Based on the long-term measurement data of DC test lines in high altitude environment, this article uses the method of variable selection to evaluate the influence of different factors on radio interference characteristics, and selects the factors with significant influence, and obtains the influence of different factors on radio interference characteristics through statistical analysis. The results show that the radio interference increases with the increase of equivalent wind speed and decreases with the increase of relative humidity.