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A method for igbt open-circuit fault diagnosis of a four-quadrant pulse rectifier for an EMU

A technology of pulse rectification and diagnosis method, which is applied in the field of traction transmission, can solve problems such as inability to distinguish diagonal IGBT faults, and achieve the effect of preventing further expansion of faults

Inactive Publication Date: 2019-07-12
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The present invention provides a method for diagnosing IGBT open-circuit faults of four-quadrant pulse rectifiers of EMUs. The method can not only quickly and accurately detect and locate any IGBT faults, but also solves the problem that the model-based method cannot distinguish diagonal IGBT faults in this field. problems, so that fault-tolerant control strategies can be adopted in time to prevent further expansion of faults

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  • A method for igbt open-circuit fault diagnosis of a four-quadrant pulse rectifier for an EMU
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  • A method for igbt open-circuit fault diagnosis of a four-quadrant pulse rectifier for an EMU

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Embodiment Construction

[0033] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0034] The method of the present invention is a model-based fault diagnosis method. Firstly, a model that can reflect the working state of a two-level pulse rectifier is established—switching system model, and four corresponding fault currents are established for the four types of faults in which IGBTs (T1~T4) are opened. The observer compares the fault current observed by each observer with the actual current collected from the system. If the residual between the actual current and a certain observed current is less than the set threshold, it is determined that the corresponding fault has occurred.

[0035] The present invention is composed of two parts: the modeling of the switching system of the pulse rectifier and the fault identification vector and diagnosis. The details are as follows:

[0036] 1) Modeling of switching system of four-quadrant pulse r...

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Abstract

The invention provides a method for diagnosing the IGBT open-circuit fault of a four-quadrant pulse rectifier of an EMU, comprising the following steps: establishing a switching system model of a four-quadrant pulse rectifier; The fault current observer; each observed fault current and the actual current are compared to get four residuals to form a fault identification vector; if any element in the fault vector is less than the threshold value, it means that the actual current is consistent with the corresponding fault current, A corresponding failure occurs in the system. The method of the invention can quickly and accurately detect and locate the fault when any IGBT fails, and solves the problem that the model-based method cannot distinguish diagonal IGBT faults in this field, so that fault-tolerant control strategies can be adopted in time to prevent further expansion of faults .

Description

Technical field [0001] The invention relates to the field of traction transmission, in particular to a method for diagnosing the open circuit fault of an IGBT of a four-quadrant pulse rectifier of an EMU. Background technique [0002] Compared with the DC drive system, the AC drive system has the advantages of large traction, good adhesion utilization, superior braking performance and small maintenance. Therefore, my country's high-speed EMUs are basically AC drive locomotives. In the AC drive system, the power device IGBT (InsulatedGate Bipolar Transistor, insulated gate bipolar transistor) is the most vulnerable link. If the IGBT in the rectifier has an open circuit fault, the grid-side current will be distorted, the power factor will drop, the DC-side voltage amplitude will decrease and the pulsation will increase, which will seriously affect the safety of the entire system. Therefore, it is extremely important to study the online diagnosis of IGBT open-circuit faults of four...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50H02M7/217
CPCG06F30/20H02M7/217
Inventor 刘志刚林双双
Owner SOUTHWEST JIAOTONG UNIV