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
CN106019044BActive Publication Date: 2019-01-25SOUTHWEST JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEST JIAOTONG UNIV
Publication Date
2019-01-25

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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.
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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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