Motor train unit inverter IGBT (insulated gate bipolar translator) single-tube open-circuit fault diagnosis method

A technology of open circuit fault and diagnosis method, which is applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of EMUs losing power, unable to pay attention to the characteristics of signal phase quantities, etc., and achieve high accuracy and precise analysis.

Active Publication Date: 2017-05-17
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0002] At present, when the EMU train fails, the drivers and passengers can only realize the fault removal by closing the module circuit. This processing method directly causes the EMU to lose part of the power and cannot run at the rated speed; in view of this situation, the current converter In the fault diagnosis technology, the method based on signal processing is to use the signal model to directly analyze various characteristic information (frequency, amplitude and phase, etc.) in the signal, which can be divided into spectrum analysis method, wavelet tran

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  • Motor train unit inverter IGBT (insulated gate bipolar translator) single-tube open-circuit fault diagnosis method
  • Motor train unit inverter IGBT (insulated gate bipolar translator) single-tube open-circuit fault diagnosis method
  • Motor train unit inverter IGBT (insulated gate bipolar translator) single-tube open-circuit fault diagnosis method

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Embodiment Construction

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

[0042] A method for diagnosing a circuit breaker failure of an IGBT single-tube inverter of an EMU, comprising the following steps:

[0043] According to the three-phase output current under the single-tube fault mode, the orthogonal compact support complex wavelet is constructed;

[0044] According to the real part and imaginary part of the constructed complex wavelet transform, the amplitude and phase distribution characteristics of the three-phase output current are obtained;

[0045] According to the amplitude and phase distribution characteristics of the three-phase output current, the phase difference characteristic quantity of each layer of the complex wavelet decomposition coefficient is calculated;

[0046] Using the maximum mutual function to calculate the correlation between the phase difference feature quantities;

[0047] Accordi...

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Abstract

The invention discloses a motor train unit inverter IGBT (insulated gate bipolar translator) single-tube open-circuit fault diagnosis method. The method includes: constructing orthogonal compact-support complex wavelet according to three-phase output current under single-tube fault mode; acquiring amplitude and phase distribution characteristics of the three-phase output current according to real and imaginary parts of conversion of the constructed complex wavelet; calculating characteristic quantity of mean values of phase difference of all layers of decomposition coefficient of the complex wavelet according to the amplitude and phase distribution characteristics of the three-phase output current; calculating correlation among the mean values of the phase difference by the aid of maximum reciprocal function; performing inverter single-tube open-circuit fault diagnosis according to comparison validation of characteristic quantity and correlation among the mean values of the phase difference of the layers. Quantitative solving is performed through the correlation among the mean values of the phase difference, and accuracy in fault diagnosis is higher as compared with the characteristic quantity of the mean values of the phase difference.

Description

technical field [0001] The invention relates to the field of fault diagnosis of a converter for a train set, in particular to a fault diagnosis method for an IGBT single-tube open circuit of an inverter for a train set. Background technique [0002] At present, when the EMU train fails, the drivers and passengers can only realize the fault removal by closing the module circuit. This processing method directly causes the EMU to lose part of the power and cannot run at the rated speed; in view of this situation, the current converter In the fault diagnosis technology, the method based on signal processing is to use the signal model to directly analyze various characteristic information (frequency, amplitude and phase, etc.) in the signal, which can be divided into spectrum analysis method, wavelet transform method, principal component transform method, etc. ; Based on data-driven methods, there are neural network diagnostic methods, fault tree diagnostic methods, particle swar...

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 刘志刚张桂南
Owner SOUTHWEST JIAOTONG UNIV
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