A field fault pre-diagnosis method for converter igbt module
A technology of fault diagnosis and converters, which is applied in the direction of instruments, measuring electric variables, single semiconductor device testing, etc., can solve the problems that fault diagnosis results are easily interfered by external signals, etc., so as to save test cost, amplify interference, and shorten test time Effect
Active Publication Date: 2019-05-14
TONGJI UNIV
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To sum up, the documents and patents mentioned in this paragraph monitor the converter system variables (such as high-frequency oscillation, output harmonics and case temperature, etc.) Additional hardware devices need to be added and the fault diagnosis results are easily interfered by external signals
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[0031] Such as figure 2 As shown, a method for on-site fault pre-diagnosis of a converter IGBT module is used for fault diagnosis of a converter IGBT module. The converter includes a DC capacitor and a plurality of IGBTs. The method includes the following steps:
[0032] S1, the electrical system where the converter is located is shut down;
[0033] S2, use the input power to charge the DC capacitor until the voltage is stable;
[0034] S3, disconnect the connection between the input power supply and the converter, and discharge the DC capacitor to the load circuit until its voltage drops to the set value;
[0035] S4, according to the specific position of the IGBT under test, configure the corresponding gate-level trigger pulse to form a through-short-circuit circuit for testing, and record the through-short-circuit current of the IGBT under test;
[0036] S5, compare the peak value of the through-short-circuit current obtained in step S4 with the peak value of the through...
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The invention relates to a current transformer IGBT module field fault pre-diagnosis method comprising the following steps: in step S1, a system is shut down; in step S2, an input power source is used for charging a direct current capacitor till voltage stabilizes; in step S3, connection between the input power source and the current transformer is broken, and the direct current capacitor is discharged till the voltage drops to a set value; in step S4, a pass-through short circuit current of an IGBT being tested is recorded; in step S5, a peak value of the pass-through short circuit current obtained from step S4 is compared with a peak value of a pass-through short circuit current of the IGBT being tested in a healthy state, and whether the IGBT being tested fails is determined; in step S6, the direct current capacitor is completely discharged; in step S7, operation returns to step S2, and a next IGBT being tested is subjected to fault testing operation till all IGBTs are tested; compared with technologies of the prior art, the current transformer IGBT module field fault pre-diagnosis method is advantaged by safety, simplicity, convenience, economical property, accuracy and the like; operation reliability of a current transformer system can be improved.
Description
technical field [0001] The invention relates to a method for on-site fault pre-diagnosis of a converter IGBT module, in particular to a method for on-site fault pre-diagnosis of a converter IGBT module. 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. As the core component of the converter, the failure of the IGBT module directly affects the 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 inside, IGBT modules may experience faults such as chip loss and thermal conductivity degradation during long-term operation. [0003] Fault pre-diagnosis technology can provide timely warning of faults before IGBT modules fail, which can prevent catastrophic accidents and provide support for efficient system operation and maintenance. Ther...
Claims
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IPC IPC(8): G01R31/26
CPCG01R31/2601
Inventor 向大为刘也可符一凡宁晨
Owner TONGJI UNIV