Inverter fault diagnosis method

A fault diagnosis and inverter technology, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve problems such as inability to accurately diagnose the cause of inverter faults, and achieve the effect of improving accuracy and sensitivity and avoiding operation accidents.

Inactive Publication Date: 2016-01-27
XUJI GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and proposes a fault diagnosis method for inverters, which solves the problem of inability to accurately diagnose the causes of inverter faults

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0025] A method for inverter fault diagnosis, the steps are as follows:

[0026] Step (1), the fault category of the inverter includes: external wiring circuit short circuit, inverter main circuit short circuit and inverter control loop abnormality; Utilize the described fault category to establish the identification framework of D-S evidence theory, i.e. Θ={ θ 1 ,θ 2 ,θ 3}, where θ 1 Short circuit for the external wiring loop; θ 2 Short circuit for the main circuit of the inverter; θ 3 The inverter control circuit is abnormal.

[0027] Step (2), taking the fault symptoms of the inverter as the evidence of the identification framework in the D-S evidence theory, and assigning the basic reliability to each piece of evidence; wherein, the fault symptoms of the inverter include: the current increases instantaneously , The grid voltage is ab...

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Abstract

The invention relates to an inverter fault diagnosis method. The types of inverter faults comprise external wire loop short circuit, inverter main loop circuit, and inverter control loop abnormity. A D-S evidence theory recognition frame is built through the fault types, and fault symptoms of the inverter serve as the evidences for the D-S evidence theory recognition frame. Moreover, the method carries out the basic credibility distribution of each evidence. The method achieves the recognition of the fault types of the inerter through a D-S evidence theory integration rule and a decision rule. The method achieves the complete and detailed analysis and reasonable summarization of fault reasons of the inverter, and summarizes the fault reasons of the inverter. Therefore, an operator can carry out accurate maintenance according to a specific fault problem, and avoids a severe operation accident.

Description

technical field [0001] The invention relates to an inverter fault diagnosis method, which belongs to the technical field of inverter faults. Background technique [0002] Inverter fault diagnosis is closely related to its operating state, component structure and other factors. Its fault state and fault mechanism are diverse. Due to the fragility of power electronic devices and the complexity of their control, PWM with modern switching devices IGBT as the core The control module is a fault-prone link. At present, many researchers are committed to the research of inverter fault diagnosis methods. Therefore, how to reduce the downtime loss caused by inverter faults and improve equipment use efficiency has very important application value. However, in the prior art, the analysis of the cause of the inverter failure is not comprehensive. Even if the inverter system produces a failure symptom during operation, the root cause of the failure cannot be accurately and detailedly diagn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 王景丹龚晓伟王留送牛高远赵萌萌刘桂莲万要军屈路军
Owner XUJI GRP
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