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Vector control motor drive system inverter open-circuit fault diagnosis method

A motor drive system, vector control technology, applied in the direction of measuring electrical variables, measuring electricity, instruments, etc., can solve problems such as complex current characteristics

Inactive Publication Date: 2016-10-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the addition of the current closed-loop regulator, the current characteristics in the vector control drive system are much more complicated than those in the current open-loop control motor drive system

Method used

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  • Vector control motor drive system inverter open-circuit fault diagnosis method
  • Vector control motor drive system inverter open-circuit fault diagnosis method
  • Vector control motor drive system inverter open-circuit fault diagnosis method

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Embodiment Construction

[0035] In order to make the present invention easier to understand, the content of the present invention will be explained more clearly and completely through specific examples below. Apparently, the described embodiments are only some, not all, embodiments of the present invention, and are not limited to its formula form. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0036] Under normal circumstances, the stator current vector trajectory is circular, and when an open-circuit fault occurs in the IGBT tube, the trajectory will change accordingly, as image 3 and Figure 4 shown. The solid line in the figure represents the stator current vector trajectory of the open-loop control system, and the dotted line represents the irregular part of the stator current vector trajectory of the closed-loop control system, and its arc part coincides with the...

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Abstract

The invention discloses an inverter power tube open-circuit fault real-time detection method in a vector control motor drive system, and belongs to the technical field of online detection. The method comprises the following steps: judging whether a fault occurs according to a d shaft voltage value; and positioning the fault according to spatial position of the stator current vector locus entering an arc part, and circumference ratio of the arc part. The method is suitable for realizing open-circuit fault diagnosis of any single tube and any double tube of an inverter in the vector control motor drive system, and has the advantages of low cost, high detection precision, fast speed, high real-time performance, good robustness and high anti-interference capability.

Description

technical field [0001] The invention relates to the technical field of on-line detection, in particular to a method for diagnosing an open circuit fault of an inverter in a vector control motor drive system. Background technique [0002] At present, as a device for converting electrical energy and mechanical energy, AC motors have been widely used in the fields of aerospace, military, industry, locomotive traction systems and ships, showing a trend of completely replacing DC motors. As the core component of the AC motor drive system, the inverter is the weakest link in the drive system that is most likely to fail. Among them, the open-circuit fault caused by the high-frequency turn-on and turn-off of the power tube is particularly significant, which directly affects the normal operation of the motor drive system. . Aiming at the open-circuit fault of the inverter power tube, a real-time and effective detection, location and isolation method are proposed, and real-time and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 赵金黄成光
Owner HUAZHONG UNIV OF SCI & TECH
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