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

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....

AI Technical Summary

Problems solved by technology

[0004] At present, a convenient, simple and fast method for diagnosing open circuit faults without modifying the inverter circuit has not been proposed.

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