Study On Cable Traction Power Supply Of Electrified Railway In Plateau Region

China’s plateau is a vast territory, but there is permafrost, alpine hypoxia, ecologically fragile harsh natural environment.So the economic of plateau develops slowly. In order to improve the economic development of plateau region, reduce the imbalance degree of economic development between eastern and western China, set up the convenient transport channel between eastern and western China, it is very necessary to build electrified railway. Cable traction power supply has excellent characteristics that, network impedance is small, the distance of power supply is long, power supply adaptability is external, rail voltage is low and so on. So that it could be selected to use in the electrified railway of plateau region.The paper analyzes the network structure of cable traction power supply, derived the equivalent circuit model of the traction network. Calculate the theoretical formula of single and double-track traction network short-circuit impedance and voltage loss.The paper researchs the traction network further more, derived the electrical parameters of current distribution of network, distribution coefficient of cable’s current, rail voltage and current, establish the system theory of cable traction power supply preliminarily.The paper establishes the simulation model of cable traction power supply using the principle of parallel multi-conductor transmission line and MATLAB/SIMULINK software.Using the simulation model to verify the correctness of the derivation of equivation circuit, and simulation study on the electrical parameters of distribution coefficient of cable’s current, voltage distribution of no-load and load of traction network, rail voltage and current.The paper also comparative analysises the direct power supply with return line, AT power supply and cable traction power supply. Reference the way of establishing simulation model of cable traction power supply, establish the simulation of AT power supply and direct power supply with return line, and conducts a technical and economic comparison such as network short-circuit impedance, voltage loss, rail voltage, quality of power supply, adaptability of external power supply, construction investment, operation and maintenace costs.Finally, analyzes the feasibility of cable traction power supply using the electrified railway in plateau region.