Research on Interactive Harmonic Impedance Measurement and Control Technology for Traction Network Based on Embedded System
摘要
The railway traction power supply system has the problem of harmonic resonance in a wide frequency band. The resonance will not only affect the power quality of the power supply system, but also cause serious harmonic resonance accidents. The impedance frequency characteristic of traction network is the key factor of harmonic resonance phenomenon, which has certain research value, but it is difficult to obtain it accurately through simulation calculation. Therefore, it is particularly important to obtain the impedance-frequency characteristics of traction network in broadband by testing, which is of great significance to the treatment of harmonic resonance problems of existing lines and the prediction and evaluation of harmonic resonance problems of new lines. Based on the existing harmonic impedance testing device, this paper studies a measurement and control technology of traction network harmonic impedance based on embedded system interaction, introduces its interface principle, software and hardware architecture, main functions of supporting software, etc., and proposes a harmonic impedance testing algorithm based on inter-harmonic interpolation and improved fluctuation method.