Electric train and high-resistance fault position discrimination algorithm for direct-supply traction network

Abstract

The invention discloses an electric train and high-resistance fault position discrimination algorithm for a direct-supply traction network, and relates to the technical field of electrified railway traction power supply. The algorithm comprises the steps: measuring a head-end voltage phasor, a head-end current phasor, a tail-end voltage phasor and a tail-end current phasor of a segmented contact line of the direct-supply traction network synchronously, limiting a circuit equation, and solving the position of an electric train and a high-resistance fault position x; dividing current extractionin a normal range where the voltage across two ends of a load line is located into two types: electric train (traction load) and high-resistance fault; determining a current extraction position x as the position of the electric train if the voltage across two ends of the load line is within the normal range and the current extraction position x, calculated through a formula, is in monotone increasing or decreasing, uploading the current extraction position x to an integrated automation substation and an electronic speed controller of a power substation; determining the current extraction position x as the high-resistance fault if the current extraction position x does not change with time and the period when the current extraction position x does not change with time exceed a parking timeperiod, uploading the position to the integrated automation substation of the power substation, giving an alarm, or sending a releasing command.

Description

technical field [0001] The invention relates to the technical field of electric railway traction power supply. Background technique [0002] my country's railway construction has attracted worldwide attention and achieved remarkable results. As of 2017, the operating mileage of my country's railways has reached 127,000 km, of which the operating mileage of high-speed railways has increased to 25,000 km. High-speed railways generally use AT (Auto Transformer, autotransformer) power supply mode, but a large number of normal-speed railways and freight lines still use DT (direct power supply) mode, and the safety and good operation of traction power supply systems must be highly valued. [0003] The structure of the traction network is complex. Although it is very difficult to identify the position of the train, it is very meaningful. It can provide technical means for the safe operation and intelligent management of the traction network. [0004] In addition, the traction net...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of direct-supply traction network electric train and high-resistance fault location discrimination algorithm, which can effectively solve the problem of real-time monitoring of the operation of the electric train and the direct-supply traction network power supply state, and effectively solve the existing problems. The technical problem that the relay protection cannot normally detect the high-resistance fault and act correctly

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