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Method of designing small fault diagnosis system used for high speed railway traction system inverter

A fault diagnosis system and design method technology, applied in the direction of instruments, measuring electrical variables, testing electrical devices in transportation, etc., to achieve the effects of micro fault sensitivity, micro fault diagnosis ability advantages, effective detection and diagnosis

Active Publication Date: 2017-07-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

It is impossible to accurately establish its mathematical model only if there are uncertain interference and external noise inside the system.

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  • Method of designing small fault diagnosis system used for high speed railway traction system inverter
  • Method of designing small fault diagnosis system used for high speed railway traction system inverter
  • Method of designing small fault diagnosis system used for high speed railway traction system inverter

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] The patent of the present invention is a design method for a micro-fault diagnosis system for high-speed rail inverters. This implementation case includes the following steps:

[0043] 1) Firstly, according to the sensors of the traction system, the data of the three-phase current offline normal operation is collected and stored. The collected data set is denoted as X abc ;

[0044] 2) The collected data set X abc Perform preprocessing, specifically including two processes: 1. According to the idea of ​​Charke and Park coordinate transformation, the data set X abc Transform into a rotated dataset X n ; 2. Standardize the rotated data set X, transform it into data with an expectation of 0 and a variance of 1, and record it as

[0045] 3) yes Feature extraction is carried out according to the idea of ​​PCA, and the eigenvalue matrix Λ, load matrix P and s...

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Abstract

The invention discloses a method of designing a small fault diagnosis system used for a high speed railway traction system inverter. The method comprises steps that 1) according to a sensor of a traction system, off-line data of three-phase current is acquired and stored; 2) the acquired data set is preprocessed; 3) characteristic extraction is carried out according to idea of PCA, and a characteristic value matrix, a load matrix, and a score matrix are acquired; 4) a distance between score vectors is measured by adopting KL divergences in pivotal element space and residual space; 5) according to the distribution and hypothesis testing method of the KL divergences of the score vectors, the detection threshold value of the pivotal element space and the threshold value of the residual space are determined; 6) data in an actual system is acquired and preprocessed; 7) KL divergences of pivotal element score vectors and KL divergences of off-line score vectors are acquired by calculation, and are compared with the threshold values for fault decision. The small fault diagnosis system of the high speed railway traction system is advantageous in that realizability and algorithm superiority are improved and optimized from application perspective.

Description

technical field [0001] The invention relates to the field of high-speed rail fault diagnosis, in particular to the diagnosis of small faults of high-speed rail inverters. Background technique [0002] With the rapid development of transportation technology and extensive market demand, high-speed rail technology at home and abroad has become an important means of transportation for people to travel. Whether it is Western high-speed rail technology or China's high-speed rail technology, there are still deficiencies, such as safety issues. Therefore, in the past five years, the safety of high-speed rail has attracted more and more attention from domestic scholars. The research on micro-faults of high-speed rail is still blank at present, and there is no substantive research result, which is mainly caused by the characteristics of micro-faults. When a small fault occurs, the impact on the system is very weak, and this deterioration characteristic is easily covered by the fluct...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/007
Inventor 陈宏田姜斌陆宁云
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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