Traction network comprehensive capacitance calculation method with return line direct power supply mode based on multi-conductor transmission line system loop method

Abstract

A traction network comprehensive capacitance calculation method with a return line direct power supply mode based on a multi-conductor transmission line system loop method is disclosed, the calculation process is clear and definite, and the calculation process conforms to the actual situation. The calculation method comprises the following steps: (1) classifying conductors in a traction network with a return line direct power supply mode according to transmission and return functions, taking a contact line and a carrier cable as transmission conductors, taking two steel rails connected in parallel, a return line, a through ground wire and the ground as return conductors, forming a loop by the conductors participating in transmission and return in pairs, and converting the system into a loop system with multiple transmission conductors and multiple return conductors; (2) deriving a self-potential coefficient in a loop and a mutual potential coefficient between loops, further constructing a potential coefficient matrix, and solving an inverse matrix of the potential coefficient matrix to obtain a unit length capacitance matrix of each loop; and (3) finally obtaining the unit length comprehensive capacitance of the traction network with the return line direct power supply mode according to the relationship between the unit length capacitance matrix and each loop charge and each loop voltage of the generated charge.

Description

technical field [0001] The invention relates to an electrified railway traction power supply system, in particular to a method for calculating the comprehensive capacitance of a traction network in a direct power supply mode with return flow lines based on a loop method of a multi-conductor transmission line system. Background technique [0002] With the development of my country's electrified railways and the implementation of the "high-speed rail going global" strategy, the demand for basic theory and refined research on electrified railway traction power supply systems is becoming more and more urgent. The calculation of the comprehensive capacitance of the traction network is to achieve an accurate mathematical description of the traction network, and then to carry out traction. It is the basis for the research of network resonance, traction network overvoltage, traction network arc, etc. In the electrified railway traction network, the direct power supply method with ret...

AI Technical Summary

Problems solved by technology

In the past mathematical models of traction networks based on multi-conductor transmission line theory, the ground was usually regarded as the reference conductor, which was easily misunderstood as the return channel of all conductors

In fact, steel rails, return lines, and through-ground wires can all be used as return channels. Therefore, as a traction network of a complex multi-conductor transmission line system, if the earth is regarded as a reference conductor, and the electromagnetic space description research on it will bring many restrictions

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