Switching characteristic-based converter IGBT module fault pre-diagnosis method

Abstract

The invention relates to a switching characteristic-based converter IGBT module fault pre-diagnosis method. The method includes the following steps that: a converter is operated, the turn-on characteristic curve and turn-off characteristic curve of each IGBT tube in an IGBT module to be pre-diagnosed, as well as IGBT module meter case temperature are obtained; the turn-on characteristic curve and turn-off characteristic curve of each IGBT tube in a health IGBT module of which the model is the same as the model of the IGBT module to be pre-diagnosed under the same meter case temperature are obtained; and the turn-on characteristic curves and the turn-off characteristic curves of corresponding IGBT tubes in the IGBT module to be pre-diagnosed are compared with the turn-on characteristic curves and the turn-off characteristic curves of corresponding IGBT tubes in the health IGBT module, so that whether the characteristic curves of the IGBT tubes are abnormal can be judged, if the characteristic curves of at least one IGBT tube are abnormal, the IGBT module to be pre-diagnosed malfunctions. Compared with the prior art, the method has the advantages of simplicity, convenience, high diagnostic accuracy and high applicability.

Description

technical field [0001] The invention relates to a fault pre-diagnosis method for an IGBT module of a converter, in particular to a fault pre-diagnosis method for an IGBT module of a converter based on switching characteristics. Background technique [0002] A converter is a power conversion device that is widely used in new energy power generation, electric vehicles, rail transit, aerospace, and metallurgy. The IGBT module is the core device of the converter, so the failure of the IGBT module will directly affect the operating reliability of the converter. Taking common packaging faults as an example, due to the differences in the thermal expansion coefficients of the materials in each layer, faults such as aging of the solder layer and breakage of the leads may occur during the long-term operation of the IGBT module. [0003] Fault pre-diagnosis technology can provide timely warning of faults before IGBT modules fail, which can prevent catastrophic accidents and provide su...

AI Technical Summary

Problems solved by technology

To sum up, the above documents and patents monitor the converter system variables (such as high-frequency oscillation, output harmonics and case temperature, etc.) The hardware device and the fault diagnosis result are easily interfered by external signals

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