Method for diagnosing main circuit fault of power converter of switched reluctance motor

Abstract

The invention discloses a method for diagnosing a main circuit fault of a power converter of a switched reluctance motor. The method comprises the following steps of: detecting a transient value of a direct current bus filter capacitor voltage of a main circuit of the power converter of the switched reluctance motor; calculating the serial variance and the power spectral entropy of the direct current bus filter capacitor voltage, which serve as fault characteristic quantities; and diagnosing an upper tube short-circuit fault, a lower tube short-circuit fault and a single-phase open-circuit fault of the main circuit of the power converter of the switched reluctance motor by adopting a serial variance curve of the direct current bus filter capacitor voltage and a power spectral entropy curve of the direct current bus filter capacitor voltage of the main circuit of the power converter of the switched reluctance motor in an overall rotating speed range. The method has the characteristics of reliable fault diagnosis, obvious effect, reduction of requirement on a sensor, high cost performance, high practicality, good effect and broad application prospect.

Description

technical field [0001] The invention relates to a fault diagnosis method for a main circuit of a switched reluctance motor power converter, in particular to a main circuit fault diagnosis method for a switched reluctance motor power converter suitable for various phase numbers and various topological structures based on DC bus filter capacitor voltage pulsation. Circuit fault diagnosis. Background technique [0002] The power semiconductor components in the main circuit of the switched reluctance motor power converter are the weak link most prone to failure, and the failure is mostly manifested as an open circuit or a direct short circuit of the power tube. The humid and dusty working environment will also increase the failure rate of the main circuit of the converter. Timely and accurate fault diagnosis can prevent the expansion of faults and reduce the losses caused by faults. The traditional fault diagnosis method for the main circuit of the switching converter requires...

AI Technical Summary

Problems solved by technology

The traditional fault diagnosis method for the main circuit of switching converters requires many test nodes, poor anti-interference performance, and increases hardware cost and system complexity

After the AC power supply is rectified by the rectifier bridge, it outputs a pulsating DC voltage, which needs to be filtered by a capacitor into a DC voltage with relatively gentle fluctuations, but the voltage pulsation of the filter capacitor is obvious

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