Pantograph-catenary off-line arc modeling simulation method with high-frequency characteristic

Abstract

The invention discloses a modeling simulation method for an off-line arc of a pantograph catenary with a high-frequency characteristic, and the method fully considers the physical processes of high-frequency impedance changes in different arc stages, such as separation arcing, zero-break arc quenching, zero-crossing reignition and the like when the pantograph catenary is off line, and simulates and calculates the discharge current of the pantograph catenary with high-frequency oscillation and low-frequency zero-break characteristics. The simulation result can more truly reflect the current characteristics of the pantograph-catenary off-line discharge, the simulation model has high accuracy, and the deficiency of high-frequency current characteristics in a traditional pantograph-catenary off-line discharge model is made up. Effective data of the discharge current can be obtained by using the model in a simulation calculation mode, a discharge experiment under high-voltage and large-current conditions does not need to be carried out, and by changing conditions such as pantograph-catenary separation step signals, load impedance and line parameters which are difficult to control in the experiment, the discharge current can be obtained. And a large amount of effective data with variable conditions are provided for research on the off-line discharge electromagnetic interference of the pantograph net.

Description

technical field [0001] The invention relates to the technical field of electromagnetic compatibility of rail transit, in particular to an off-line arc modeling and simulation method of pantograph and catenary with high frequency characteristics. Background technique [0002] In recent years, the traction power and automation degree of my country's railway system have been comprehensively improved, and the scale and quantity of on-board and trackside power electronic equipment have reached an unprecedented level, and the electromagnetic environment safety and adaptability of railway systems have become increasingly prominent. A large number of studies have pointed out that the mechanical separation of the pantograph and the contact wire when the train is running will cause the discharge phenomenon between the pantograph carbon slide and the catenary wire, that is, the offline arc of the pantograph. Arc discharge will produce pulse-type transient electromagnetic disturbance wi...

AI Technical Summary

Problems solved by technology

It is precisely because of the lack of physical description of the air breakdown in the existing AC arc models that these models cannot explain the cause of the high-frequency characteristics of the current

On the other hand, the existing AC arc model does not consider the key factors of the pantograph-catenary offline movement such as separation time and gap distance, nor is it calculated in the equivalent circuit of the railway traction power supply system, so the research results cannot accurately describe the arc. The change of the discharge current of the pantograph-catenary network with time, the obtained model cannot be directly applied to the simulation and calculation of the offline discharge current of the pantograph-catenary system

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