Switch magnetic resistance motor power converter short-circuit fault bus current diagnosis method

Abstract

Provided is a switch magnetic resistance motor power converter short-circuit fault bus current diagnosis method. A bus current instantaneous value of a switch magnetic resistance motor power converter is detected so that a mean value delta of maximum values of a wavelet transformation coefficient corresponding to bus current under different scale parameters is calculated and acts as fault characteristic quantity. A main switch short-circuit fault on the position of the switch magnetic resistance motor power converter is diagnosed by using a mean value delta curve of the maximum values of the wavelet transformation coefficient corresponding to the bus current of the switch magnetic resistance motor power converter under different scale parameters within the whole speed range. The diagnosis method is applicable to diagnosis of the main switch short-circuit fault on the position of the switch magnetic resistance motor power converter with various topological structures and various phases, accurate in short-circuit fault diagnosis and great in engineering application value.

Description

technical field [0001] The invention relates to a method for diagnosing the bus current of a short-circuit fault of a main switch at a position of a power converter of a switched reluctance motor, especially a short-circuit fault of the main switch at the position of a power converter of a switched reluctance motor suitable for various phase numbers and various topological structures. Diagnostic methods for bus currents. Background technique [0002] The switched reluctance motor system has a power supply mode of non-sinusoidal current and non-sinusoidal voltage, and operates on the principle of minimum reluctance, but the fault diagnosis method of the traditional motor power converter cannot be directly applied to the switched reluctance motor power converter. At present, most of the fault diagnosis methods for switched reluctance motor power converters are aimed at the short-circuit fault of the main switch of double-switch power converters. The public switching power con...

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Problems solved by technology

[0002] The switched reluctance motor system has a power supply mode of non-sinusoidal current and non-sinusoidal voltage, and operates on the principle of minimum reluctance, but the fault diagnosis method of the traditional motor power converter cannot be directly applied to the switched reluctance motor power converter

At present, most of the fault diagnosis methods for switched reluctance motor power converters are aimed at the short-circuit fault of the main switch of double-switch power converters.

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