Track Circuit Interference Data Processing Based On Main Character Group Extraction Method

Electrified railway transportation has gradually become an important pillar of railway transportation in the world.China’s development direction for the future high-speed rail is to reach a faster pace,the development of intelligent high-speed rail and the construction of green high-speed rail.These three aspects complement each other and also need to advance simultaneously.China’s railway transportation industry will occupy an extremely important position in the national economy.This poses higher challenges to the requirements of electrified railway technology,and the emergence of problems of electrification interference is not uncommon.Due to the increasing demand for speed and the requirement for high-power traction in heavy-duty railways,the traction current provided by the traction power supply system is increasing.Research on protection of traction current interference is of great significance.In this context,this thesis analyzes the characteristics of track circuits and traction current harmonics in high-speed railway.Based on the principle of electromagnetic disturbance,the thesis thoroughly studies the interference of traction current harmonics on the track circuit.Focused on the principal component analysis method a harmonic group constructed for traction power supply system is put forward.Then the thesis gets the harmonic characteristics of the interference signal system and the basis for the reliability of interference prevention measures for the generation of disturbing harmonic characteristics.The main work of this thesis includes:First,based on the analysis of the working principle of the traction power supply system and the electric locomotive,the traction current harmonic interference source,the coupling path,and the working principle of the disturbed equipment which namely the track circuit,are clearly defined.It provides a theoretical basis for constructing a traction current harmonic disturbance test system.Secondly,a harmonic current analysis platform has been developed,including locomotive traction current,track circuit current acquisition and analysis,and the use of Lab VIEW software develops for harmonic current data processing software,multi-dimensional analysis of field test data.Finally,using the principal component analysis(PCA)in statistics,a screening method for harmonic dominant feature groups based on field test data analysis results is designed.Through the correlation coefficient,the thesis calculates the index of the harmonic characteristic group,makes a model validation on the interference fault phenomena,and provides a reliable basis for the control of the harmonic interference of the traction current in the electrified railway.