Real-Time Measurement of AC Line Parameters Based on Digital Twins

Due to the influence of geographical environment, climatic conditions, and load levels on AC transmission lines, there will inevitably be errors between transmission line parameters and real ones during modeling, which may bring wrong guidance to power flow calculation and reactive voltage control. However, the existing transmission line parameter measurement methods have some limitations, which cannot quickly and accurately measure the actual line parameters under different conditions in real time. In this article, a realtime measuring method of AC line parameters on the basis of digital twin is proposed, an accurate AC line digital twin model is established, the electrical quantity at both ends of the actual line is collected, and the data interaction method with the virtual simulation model is present, which comprehensively improves the rapidity and accuracy of AC transmission line measurement. The simulation result shows that measurement method mentioned above can quickly and reliably measure AC transmission line parameters that vary under different conditions, and the error is controlled within a reasonable range.