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Method and system for soft fault diagnosis of power electronic equipment based on conversion efficiency

A conversion efficiency and power electronics technology, which is applied in the field of soft fault diagnosis of power electronic equipment based on conversion efficiency, can solve problems such as the change of conversion efficiency of power electronic equipment and affect fault diagnosis of power electronic equipment, and achieve the effect of accurate fault diagnosis results.

Active Publication Date: 2021-07-23
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the temperature of the working environment is different, the working characteristics of the power electronic components will also change accordingly, which will lead to changes in the conversion efficiency of the entire power electronic device, thereby affecting the fault diagnosis of the power electronic device

Method used

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  • Method and system for soft fault diagnosis of power electronic equipment based on conversion efficiency
  • Method and system for soft fault diagnosis of power electronic equipment based on conversion efficiency

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Embodiment 1

[0041] like figure 1 Shown is a flow chart of a method for diagnosing soft faults of power electronic equipment based on conversion efficiency provided by an embodiment of the present invention, and the diagnosing method includes:

[0042] Step S101, acquiring electrical signals of the power electronic equipment, the electrical signals including: input power and output power.

[0043] In the embodiment of the present invention, to determine whether the power electronic equipment is working normally, it is necessary to obtain the electrical signal of the equipment when it is working. The electrical signal includes but is not limited to: input power, output power, where the input power P in Through the input voltage U in multiplied by the input current I in get, that is, P in =U in *I in , output power P out Through the output voltage U out Multiplied by the output current I out get, that is, P out =U out *I out , it should be noted that the output voltage U out The ...

Embodiment 2

[0062] like figure 2 Shown is a structural diagram of a soft fault diagnosis system for power electronic equipment based on conversion efficiency provided by an embodiment of the present invention. The diagnosis system includes:

[0063] The electrical signal acquisition module 201 is configured to acquire electrical signals of power electronic equipment, where the electrical signals include: input power and output power.

[0064] In the embodiment of the present invention, to determine whether the power electronic equipment is working normally, it is necessary to obtain the electrical signal of the equipment when it is working. The electrical signal includes but is not limited to: input power, output power, where the input power P in Through the input voltage U in multiplied by the input current I in get, that is, P in =U in *I in , output power P out Through the output voltage U out Multiplied by the output current I out get, that is, P out =U out *I out , it sho...

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Abstract

The present application provides a method and system for diagnosing soft faults of power electronic equipment based on conversion efficiency. The method includes: acquiring an electrical signal of a power electronic device, the electrical signal including: input power, output power; acquiring the actual conversion efficiency of the power electronic device according to the electrical signal, and acquiring the actual conversion efficiency of the power electronic device according to the ambient temperature and the output power The predicted conversion efficiency of the power electronic device; judging whether the difference between the predicted conversion efficiency and the actual conversion efficiency is greater than a first threshold, and marking according to the result of the judgment; acquiring the marking for multiple consecutive times, according to the Obtaining a sliding average value through multiple markings, judging whether the sliding average value is greater than a second threshold, and diagnosing that the power electronic device is faulty if it is greater than the second threshold. The fault diagnosis of the power electronic equipment in this application is related to the ambient temperature, and the result of the fault diagnosis is more accurate.

Description

technical field [0001] The present application belongs to the field of power electronics, and in particular relates to a method and system for diagnosing soft faults of power electronic equipment based on conversion efficiency. Background technique [0002] Power electronic devices play an important role in promoting the development of modern science and technology. It plays a vital role in transforming traditional industries and developing new high-tech industries. It is also one of the keys to efficient use of energy. Therefore, whether power electronic devices can Normal operation is even more important. The application fields of power electronic devices almost involve all industrial sectors of the national economy, and the application occasions are more complex and changeable, especially reflected in the change of temperature, from the deep sea with a negative altitude to the plateau with an altitude of several thousand meters, from the north and south poles to the equat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R21/00
CPCG01R21/00G01R31/00
Inventor 林琼斌曾锦雄苏先进蔡逢煌柴琴琴
Owner FUZHOU UNIV
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