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Method for diagnosing IGBT open-circuit fault of single-phase cascaded NPC rectifier

A technology of open circuit fault and diagnosis method, applied in the direction of continuity test, can solve the problem of secondary fault of the device, achieve the effect of fast diagnosis speed, accurate diagnosis result and optimization of open circuit fault method

Active Publication Date: 2020-06-19
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, most of the existing fault diagnosis methods for cascaded three-level NPC rectifiers are signal-based and knowledge-based methods, which need to analyze a large amount of data before fault location and identification, which may cause secondary faults to other devices.

Method used

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  • Method for diagnosing IGBT open-circuit fault of single-phase cascaded NPC rectifier
  • Method for diagnosing IGBT open-circuit fault of single-phase cascaded NPC rectifier
  • Method for diagnosing IGBT open-circuit fault of single-phase cascaded NPC rectifier

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Embodiment Construction

[0037] The present invention will be described in detail below with reference to the drawings and embodiments.

[0038] The electrical parameter acquisition model of the single-phase cascaded NPC rectifier based on the fault setting of the present invention sets the programming environment as MATLAB / Simulink, and the programming language as the C language of MATLAB / Simulink itself. The programming environment of faulty unit location and faulty IGBT identification algorithm based on fault model analysis is CCS, and the programming language is C language.

[0039] The embodiment takes the double-module cascaded single-phase cascaded NPC cascaded rectifier used for the vehicle-mounted power electronic transformer system as an example, such as figure 1 It is the AC-DC-AC type power electronic transformer topology diagram, figure 2 It is the topological diagram of single-phase cascaded NPC rectifier. The IGBT open-circuit fault diagnosis method of the single-phase cascaded NPC cas...

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Abstract

The invention discloses a method for diagnosing an IGBT open-circuit fault of a single-phase cascaded NPC rectifier. A hybrid logic dynamic model of a single-phase NPC ripple rectifier is establishedthrough a current direction and an IGBT control signal; an input voltage and an input current of an initial alternating current side are estimated through the model; and a fault unit is found out through voltage residual error positioning, and a fault IGBT is identified through a current residual error change. The method considers the influence of high-voltage, high-power and strong electromagnetic environment on the power electronic transformer, and has the characteristics of high diagnosis speed, more accurate diagnosis result, no need of more data and the like.

Description

technical field [0001] The invention belongs to the technical field of reliability of power electronic devices, and relates to a fault estimation model of a multi-level NPC rectifier cascaded at the AC end of a power electronic transformer, the influence of control transitions and condition transitions on the estimation model, and the input current residual change rate when occurring The law of change after a fault specifically relates to a diagnostic method for an IGBT open circuit fault of a single-phase cascaded NPC rectifier. Background technique [0002] Compared with traditional industrial frequency transformers, power electronic transformers have many advantages, such as small size, light weight, and stable and controllable output voltage. However, as a multilevel converter at the AC end of a power electronic transformer, single-phase cascaded NPC rectifiers have more semiconductor power devices and operate in complex environments such as high voltage, high power, and...

Claims

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Application Information

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IPC IPC(8): G01R31/54
Inventor 葛兴来晋明波
Owner SOUTHWEST JIAOTONG UNIV
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