Three-level inverter switching tube open-circuit fault diagnosis method

A technology of three-level inverter and three-level inverter, which is applied in the direction of measuring electrical variables, instruments, measuring electricity, etc., can solve the problems of low reliability, achieve high reliability, simple logic diagnosis idea, and diagnosis speed fast effect

Active Publication Date: 2016-11-23
彭秀琼
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  • Abstract
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  • Application Information

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Problems solved by technology

However, these methods only consider the failure mode of a single device open circuit and are less reliable

Method used

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  • Three-level inverter switching tube open-circuit fault diagnosis method
  • Three-level inverter switching tube open-circuit fault diagnosis method
  • Three-level inverter switching tube open-circuit fault diagnosis method

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] by figure 1 Take the A-phase bridge arm of the NPC three-level inverter circuit shown as an example to analyze the working conditions of the NPC three-level inverter circuit. P state (QA1QA2 on, QA3QA4 off): such as figure 1 As shown in (a), when the load phase current is positive (the direction of the solid line in the figure), the current flows through QA1 and QA2 (neglecting the tube voltage drop), at this time U AO =+1 / 2U d ; When the load phase current is negative (the direction of the dotted line in the figure), the current flows through the freewheeling diodes D1 and D2 connected in parallel with QA1 and QA2, similarly U AO =+1 / 2U d ; O state (QA2QA3 is turned on, QA1QA4 is turned off): if figure 1 As shown in (b), when the load phase current is positive, the current flows through D5 and QA2, at this time U AO =0; when the load phase current is nega...

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Abstract

The invention discloses a three-level inverter switching tube open-circuit fault diagnosis method. According to the diagnosis method, the switching state, the polarity of load phase current and the bridge arm phase voltage are taken as fault characteristics, open-circuit fault characteristic analysis is made under different switching states based on a current flow path method to get fault diagnosis rules, and thus, switching tube open-circuit fault diagnosis of a diode neutral point clamped (NPC) three-level inverter is realized. Through the diagnosis method, a single-tube fault can be diagnosed, and a double-tube fault can be identified effectively. Moreover, the diagnosis method has the advantages of quick diagnosis, high reliability, and the like.

Description

technical field [0001] The invention relates to fault diagnosis technology of power electronic devices, in particular to an open-circuit fault diagnosis method of a multilevel inverter. Background technique [0002] Compared with the traditional two-level inverter, the three-level inverter represented by the diode neutral point clamp (NPC) structure has low harmonic content in the output voltage waveform, low electromagnetic interference, high voltage capacity, and low voltage jump. Low rate of change, has been widely used in traction drive systems. However, the number of switching devices in the NPC three-level inverter circuit is large, resulting in a high failure rate and low reliability. Any device failure may cause the entire circuit to stop working, resulting in immeasurable economic losses. Therefore, how to quickly realize circuit fault diagnosis is of great significance for improving the working reliability of NPC three-level inverter. [0003] At present, many me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 沈艳霞苗贝贝
Owner 彭秀琼
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