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Study on Short Circuit DC1500V Traction Power Supply System for Urban Rail Transit

Author: HuangWeiJun
Tutor: WangZuo
School: Southwest Jiaotong University
Course: Power Electronics and Power Drives
Keywords: Urban Rail Transit 12 pulse rectifier Steady - state short-circuit current Transient short-circuit current Transient electrical parameters
CLC: TM922.3
Type: Master's thesis
Year: 2010
Downloads: 230
Quote: 11
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Abstract


Urban rail transit analysis and calculation of short-circuit fault is to improve the traction power supply system safe operation capability and protection and control technology on the basis of . First calculate the short-circuit at various points in the calculation of the steady-state short-circuit current , the establishment of the steady-state short-circuit current model of the DC traction power supply system , the rectifier unit is equivalent to a voltage source with internal resistance , the use of the external characteristics of the rectifier unit . Rectifier unit at the outlet of a short-circuit fault , the faster the rate of rise of the short-circuit current , short-circuit current transient impact of the phenomenon is more obvious , is of great significance to study the short-circuit fault of the exit . Through the establishment of a mathematical model of the 12 - pulse rectifier traction power supply system , derived at the outlet of the short-circuit current approximate expression , and modeling and simulation to verify the accuracy of the calculation method . Track transient changes of the electrical parameters must be taken into account when calculating the distal short-circuit fault current . Permeability and size of the tracks , rails transient resistance and internal inductance extremely vulnerable to the impact of the skin effect , the entire short - circuit the process with the change in frequency change . Equivalent cylindrical conductor model calculation of the tracks transient impedance . Outer inductance of the track reflects the effect of the magnetic field around the track , is the inductance of the the track outside space magnetic field and the current cross-linking , determine the the traction network track pitch , and the external installation environment , the outside of the track inductance determined on the basic . The remote short , the DC-side impedance limits the fault current rate of rise and the fault current peak short-circuit current exponentially changes with the increase in peak fault current of the short-circuit distance disappear . Rectifier unit remote short-circuit fault , not detailed AC-DC calculation model , this paper using a simple DC voltage source model equivalent calculated the distal short circuit fault current .

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electric traction > Traction power supply system
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