Impedance Calculation Method of Tunnel Traction Network with Return Line Direct Power Supply

Abstract

The invention discloses a method for calculating the impedance of a tunnel traction network in a direct power supply mode with a return line, which is applied to a traction power supply system in a direct power supply mode with a return line in an electrified railway tunnel, considering all the participation of the traction power supply system in the tunnel including the ground The conductors of transmission and return, after the conductors in the traction network system are classified according to the functions of transmission and return, loops are constructed by two different conductors participating in transmission and return. The distance parameter is derived to calculate the self-impedance of each loop and the mutual impedance between different loops, solve the impedance matrix to obtain the current distribution coefficient of each loop to obtain the comprehensive impedance of the system, and finally obtain the impedance parameter of the direct power supply mode with return line; Based on the actual loop of the system, it avoids the complex situation of the traditional model constructed with the earth as the reference conductor, reduces the complexity of calculation, and can obtain the current distribution coefficient of each loop of the traction network.

Description

technical field [0001] The invention relates to a calculation method of electrical parameters of a traction network in an electrified railway tunnel and a traction power supply system adopting a direct power supply mode with return lines, in particular to a calculation method of impedance. Background technique [0002] With the development of my country's electrified railway, it is more urgent and necessary to carry out basic theoretical research on electrified railway. Among them, the accurate description of the mathematical model of electrified railway traction network and the accurate grasp of electrical parameters are the prerequisites for the development of traction power supply system research. The complex traction power supply system, such as the direct power supply method with return lines, including contact lines, catenary cables, return lines and steel rails, forms a complex electromagnetic field structure and relationship; while direct power supply with return line...

AI Technical Summary

Problems solved by technology

Since the traction power supply system is a complex multi-conductor transmission system composed of the contact wire and the catenary cable as the transmission conductor, and the return line, steel rail, and the earth as the return conductor, the model constructed with the earth as the reference conductor increases the computational complexity. Complexity

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