Research On The Area Power Supply Mode Between AT And Direct Power Supply At High Speed Railway Traction Network

In recent years,the high-speed train running fast and high density,higher demands on the safety performance of traction power supply mode.Traction power supply interruption will directly cause the train outage,traffic interruption caused by railway traffic paralysis,disrupt the normal railway transportation order,so the traction power supply system must ensure uninterrupted power supply under various conditions.When the traction substation electrical related power supply equipment serious due to the fault of the substation is out of operation,or traction network whole supply arm equipment fault in power supply arm is long time blackout and short time unable to provide power,the use of the power supply.The district power supply is one of the rescue measures after the fault occurs,it can better guide the motor car group than the normal operation,there is no parking accident.China’s high speed rail lines and high-speed section mostly used at power supply mode as the mainstream technology,siding and the hub section most of the direct power supply as an assistive technology,so high Tieyue District,the power has following three possible:at section at section more area,at section to direct supply section more area and direct supply section at the section of the district.First case is most simple,not as the main contents of this paper,due to the direct supply section train density,speed is slow,the line is complex,multiple fault section,and at power supply section of the existing power supply mode of different problems,two is more extreme and the power supply is the focus of this paper,In view of the high speed railway traction substation fault in power supply system,need to take short-term method over zone power supply substation for power supply section to implement the rescue of fault traction.The first direct traction substation fault by adjacent AT type traction substation is the power supply of the mathematical modeling,the。main parameters calculation and relay protection configuration;Then the AT type traction substation fault,from close to the direct traction substation is the power supply mathematical modeling and calculation of the main parameters and configuration of relay protection;at the end of the two cases were simulated by using MATLAB simulation software,the simulation waveform shows that the mathematical model of the above two cases to establish the correct parameters,the calculated results obtained by analysis and comparison,check two cases of traction network voltage losses and limit the operation of the vehicle the number of EMU under different conditions,and provide the reference for the fault condition in the practical operation of the electric power dispatching.