Method and device for diagnosing open-circuit fault of three-phase inverter, and electronic equipment

A three-phase inverter, open-circuit fault technology, applied in the direction of measuring devices, instruments, measuring electricity, etc., can solve the problem that the open-circuit fault has not been raised

Active Publication Date: 2019-01-08
CENT SOUTH UNIV +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] At present, a convenient, simple and fast method for diagnosing open

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  • Method and device for diagnosing open-circuit fault of three-phase inverter, and electronic equipment
  • Method and device for diagnosing open-circuit fault of three-phase inverter, and electronic equipment
  • Method and device for diagnosing open-circuit fault of three-phase inverter, and electronic equipment

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Embodiment Construction

[0074] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0075] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0076] Embodiments of the present invention provide a method, device and electronic equipment for diagnosing an open-circuit fault of a three-phase inverter. The technical solution of the method provided by the present invention will be further explained in detail belo...

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Abstract

The invention discloses a method for diagnosing an open-circuit fault of a three-phase inverter. The method comprises the steps of obtaining A, B and C three-phase output current data through a current transformer, and listing out a time expression of three-phase output currents; converting the time expression of the three-phase output current into a space track expression under a space rectangular coordinate system; drawing a space track graph according to the space track expression; and performing retrieving in an existing fault space track graph set by using the space track graph, and if aset item in the existing fault space track graph set matched with the space track graph is retrieved, outputting a fault type corresponding to the retrieved set item as a diagnosis result. The methodrealizes the function of performing measurement through the current transformer to obtain the A, B and C three-phase output currents of the inverter and diagnosing the open-circuit fault condition ofthe three-phase inverter by utilizing the three-phase output currents, and has the advantages of no need of performing circuit transformation on the three-phase inverter, convenience, quickness, accuracy and the like.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an open-circuit fault diagnosis method, device and electronic equipment for a three-phase inverter. Background technique [0002] Three-phase inverters are not only widely used in industrial production today, but also play a vital role in the transportation industry. However, due to the sensitivity of its own components and the uncertainty of the working environment, its failure rate has always been high in power electronic systems. In recent years, open-circuit fault diagnosis technologies for power tubes of three-phase inverters have emerged in an endless stream. It can be divided into two types: voltage diagnosis method and current diagnosis method. Although the existing open-circuit fault diagnosis techniques have their own advantages, there are many objective conditions that are difficult to change in the locomotive inverter, which restricts the application of many methods....

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 李凯迪于天剑向超群成庶伍珣刘暾罗屿
Owner CENT SOUTH UNIV
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