Study On The Influence Of Traction Reflux In The Traction Power Supply System Of High Speed Railway For The Signal System

The high-speed railway traction power supply system and signal system are the indispensable systems of railway operation,which together support the operation of high-speed railway.But there is a conflict between them^[1].The strong current in the traction power supply system and the strong magnetic field caused by the strong current pose a fatal threat to the safe and reliable operation of the signal system.In order to solve this threat,we need to balance and signal equipment operation mechanism of traction current in-depth analysis,in order to obtain solutions,and to strengthen the protection of traction power supply and signal system.Firstly,this paper introduces the composition and development of high-speed railway.Then the paper introduces the various components of the traction power supply system,the main power supply mode of catenary and the working principle of electric locomotive,and puts forward the reason of the harmonics of the power supply system.Then introduces the principle and structure of high-speed railway signaling systems,and puts forward some characteristics of the power disturbance.Then the influence of traction power supply on signaling system in high-speed railway is studied by two aspects:?1?The research on the principle of unbalanced traction reflux in steady state environment,the harmonic generation mechanism of traction power supply system is analyzed,and the main harmonic disturbance sources in traction power supply system are given.The harmonic content and amplitude of the disturbing current in the ZPW-2000A orbit are measured,and the variation regularity of the disturbing current amplitude is given by sorting the data,and the attenuation of harmonic interference current is analyzed.Based on the theory of orbit four-end network,the mathematic model of unbalanced traction reflux is established on the basis of ZPW-2000A-free shift-frequency track circuit.By using the intermediate injection method of the current in the model,the impedance of different frequencies is computed according to the mathematic model,and the harmonic component is studied in the vicinity of the track circuit frequency,the attenuation of current in different bed,different frequencies and the interference voltage and current in the receiving end of the orbit circuit.The limit value of anti-interference of the integrated track circuit equipment is used to determine the harmonic disturbance,so as to gain the interference of the harmonic caused by the traction reflux itself.In unsteady environment?impulse current disturbance of traction reflux?simulation equivalent circuit in traction reflux,the principle of impulse current disturbance is analyzed.Finally,through the analysis and research of these two aspects,this paper gives the protective measures to weaken or reduce the influence of traction power supply system on the signal systems.