Diagnosis method for switch tube open circuit fault of two-level single-phase four-quadrant pulse rectifier in electric traction AC drive

A technology of AC transmission and pulse rectification, which is applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve problems affecting the performance of AC and DC systems, achieve good real-time performance, good versatility, and save measurement points

Active Publication Date: 2019-01-25
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

When the switching tubes on different bridge arms of the two-level single-phase four-quadrant pulse rectifier fail, the harmonic content of the current on the AC side will inevitably change, and the corresponding fluctuations on the DC side will also be different, which affects the performance of the entire AC-DC system to a certain extent

Method used

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  • Diagnosis method for switch tube open circuit fault of two-level single-phase four-quadrant pulse rectifier in electric traction AC drive
  • Diagnosis method for switch tube open circuit fault of two-level single-phase four-quadrant pulse rectifier in electric traction AC drive
  • Diagnosis method for switch tube open circuit fault of two-level single-phase four-quadrant pulse rectifier in electric traction AC drive

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Embodiment

[0045] The open-circuit fault diagnosis of the switching tube of the electric traction AC drive two-level single-phase four-quadrant pulse rectifier can be carried out according to the method described in the present invention:

[0046] Step 1: Build a normal working model of a two-level single-phase four-quadrant pulse rectifier on the RT-LAB platform, set the PWM switching frequency to 500Hz, and set the intermediate DC side voltage to 3000V; write the pulse rectifier control program on the DSP to realize two The normal operation of the level single-phase four-quadrant pulse rectifier, the waveform is as image 3 shown;

[0047] Step 2: By controlling the loss of the control pulse of the DSP, the effect of the open circuit failure of the switch tube is realized;

[0048] Step 3: Every other sampling interval, a grid-side current value is obtained by sampling, and added to the grid-side current value queue;

[0049] Step 4: Perform FFT on the grid-side current value queue t...

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Abstract

The invention discloses a method for diagnosing the open circuit fault of a switch tube of a two-level single-phase four-quadrant pulse rectifier for electric traction AC transmission, which is completed based on the working principle of a two-level single-phase four-quadrant pulse rectifier. Harmonic feature extraction of level single-phase four-quadrant pulse rectifier under fault conditions, normalization of harmonic features based on load level and corresponding open circuit fault diagnosis results according to the fault characteristics of different types of open circuit faults. The method can realize the diagnosis of the two-level single-phase four-quadrant pulse rectifier in different switching tube fault states in an online real-time system, and is not affected by the load variation of the rectifier.

Description

technical field [0001] The invention belongs to the technical field of electric traction AC transmission, and relates to a method for diagnosing the open circuit fault of a switching tube of a two-level single-phase four-quadrant pulse rectifier of electric traction AC transmission. Background technique [0002] The electric traction of high-speed trains in my country adopts AC drive system, and the grid-side converter is an important part of the entire train traction system. The grid-side converter widely used in high-speed trains is a two-level single-phase four-quadrant pulse rectifier. Due to the control strategy, the switching tube used in the rectifier is always in a high-frequency switching state, the loss and heat are very serious, and the switching tube is relatively fragile, so open circuit or short circuit faults are basically inevitable, which is very important for the normal operation of the entire transmission system. There is great danger in running. Therefo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 葛兴来田子思熊成林宋文胜冯晓云
Owner SOUTHWEST JIAOTONG UNIV
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