Study On All Parallel Directly Feeding System With Reinforce Wire

At present, all parallel AT power supply is the main style of the high-speed railway in China. The AT power supply system have advantages in high quality of power supply, small impedance of traction and long distance of power supply and so on . But due to the high proportion of bridge and tunnel, the poor transportation, a lot of traction transformers of AT power supply and missive civil engineering, it is more difficult to set up stations and operation maintenance for the electrified railway in mountain area. Therefore, all parallel power supply system with reinforcing wire is used to overcome this difficulty of AT power supply.This thesis analyzes the network structure of direct power supply system with reinforcing wire whose electrical elements can be divided to series elements and parallel elements. Based on classical Carson theory, the paper calculates series impedance matrix and parallel admittance matrix of traction network, merges parallel multi-wire, and constructs the model of traction network by parallel multi-conductor transmission line analysis method.This paper based on the principle and deduces the equivalent model of direct power supply system with reinforcing wire, future to deduce the calculation of the current distribution, voltage level and short circuit impedance in single line way of direct power supply system with reinforcing wire and double lines way of all parallel direct power supply system with reinforcing wire.This paper builds all parallel power supply system with reinforcing wire simulation model via the platform of Matlab/Simulink. By modeling anslysis, the validity of deduced equivalent circuit of all parallel direct power supply system with reinforcing wire is confirmed. At the same time, the short circuit impedance and voltage level of traction electric network are analysed, adding the current distribution and rail potential of direct power supply system with reinforcing wire.In addition, building AT power supply simulation model,this thesis also compares the difference between the ways of AT power supply, all parallel direct power supply system with reinforcing line and direct power supply system with return line, and mainly makes a comparion and anslysis on some indexes such as short circuit impedance, voltage level, current distribution, rain potential in this three power supply ways.