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Early fault diagnosis method for inverter circuit and motor of high-speed train

An inverter circuit and early failure technology, which is applied in the field of fault diagnosis of high-speed train electric traction system, can solve problems such as complex process, failure to detect early failure, and inability to determine the type of failure

Active Publication Date: 2021-11-12
JIANGSU UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

This method needs to know the specific system structure in order to establish a mathematical model, and the whole process is relatively complicated; on the other hand, although this method can detect faults, it cannot detect early faults, and at the same time, it cannot determine the type of fault.

Method used

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  • Early fault diagnosis method for inverter circuit and motor of high-speed train
  • Early fault diagnosis method for inverter circuit and motor of high-speed train
  • Early fault diagnosis method for inverter circuit and motor of high-speed train

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Embodiment Construction

[0078] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0079] The present invention designs an early fault diagnosis method for high-speed train inverter circuits and motors, such as figure 1 As shown, the steps are as follows:

[0080] Step 1. According to the six working states of the inverter circuit and the motor, use the kernel density estimation function to build six working modes for it, and obtain the cluster center of each mode, as shown in image 3 As shown, the steps are as follows:

[0081] Step 1. If figure 2 As shown, sensors are installed in the output port of the converter and the motor to obtain the current signal i a , i b , i c , train speed Sp, motor speed Rs, electromagnetic torque data Te. Randomly choose a set of data x=[i a ,i b ,i c ,Sp,Rs,Te] T , as the cluster center of a class of data, namely x i,j , i=1,2,3...6. Then take the next set of data, as x new,j .

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Abstract

The invention discloses an early fault diagnosis method for an inverter circuit and a motor of a high-speed train, and mainly aims at an inverter circuit and a three-phase squirrel-cage asynchronous motor in a CRH train, the method comprises the following main steps: (1) establishing six working modes for the inverter circuit and the motor by using a kernel density estimation function; (2) in each mode, processing sensor data by using a new statistical analysis method, and judging whether a fault occurs or not according to a certain decision criterion; and (3) after a fault is found, extracting fault features to form a fault feature matrix, and performing fault positioning. According to the method, statistics are more sensitive to faults, and early faults can be found in time; and a new matrix distance criterion is adopted, so that the accuracy of the positioning result is improved.

Description

technical field [0001] The invention discloses an early fault diagnosis method for an inverter circuit and a motor of a high-speed train, and belongs to the technical field of fault diagnosis of a high-speed train electric traction system. Background technique [0002] Today, my country's high-speed railway operation mileage ranks first in the world. The safe and stable operation of high-speed trains is not only closely related to the safety of passengers, but also has an important impact on the development of the national economy. Every year, the loss caused by failure to detect high-speed rail failures in time is very huge. Therefore, in the process of train operation, early detection and treatment of faults has become a research hotspot. [0003] Electric traction system is one of the core systems of high-speed trains, and its reliability is an important guarantee for the safe and stable operation of high-speed trains. As an important part of energy conversion in the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R31/28G01R31/34
CPCG01R31/008G01R31/343G01R31/2848G01R31/282G01R31/2843
Inventor 吴云凯刘向前周扬朱志宇
Owner JIANGSU UNIV OF SCI & TECH
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