Method for diagnosing standard deviation of detail coefficients of faults of power converter of switched reluctance motor

Abstract

The invention discloses a method for diagnosing standard deviation of detail coefficients of faults of a power converter of a switched reluctance motor. The standard deviation sigma of the detail coefficients is calculated by detecting the phase current transient values of the power converter of the switched reluctance motor, the standard deviation sigma is used as fault characteristic quantity, and master switch short-current faults of the power converter of the switched reluctance motor are diagnosed by adopting a curve of the standard deviation sigma of the detail coefficients of the phase currents of the power converter of the switched reluctance motor in a whole rotating speed range or a whole turning moment range. The method for diagnosing the standard deviation of the detail coefficients of the faults of the power converter of the switched reluctance motor is suitable for switched reluctance motor power converters of multiple phases and multiple topological structures, accurate in diagnosis for short-current faults, and good in engineering application value.

Description

technical field [0001] The invention relates to a method for diagnosing the standard deviation of short-circuit fault detail coefficients, in particular to a method for diagnosing the standard deviation of short-circuit fault detail coefficients of power converters suitable for switched reluctance motors with various phases. Background technique [0002] Although the research on fault detection and diagnosis technology for switched reluctance motor system has gradually attracted extensive attention of researchers at home and abroad, it started late and achieved few results. Most researches on fault diagnosis of switched reluctance motor systems are based on qualitative theoretical analysis or comparative analysis of system fault state and normal state performance. The power converter is an important part of the switched reluctance motor system, and it is a place where failures occur frequently. Most of the fault protection measures for power converters stay at the level of ...

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Problems solved by technology

Most of the fault protection measures for power converters stay at the level of overcurrent, overvoltage, and overheating protection for power devices. This is only effective when the fault develops to a certain extent and affects the characteristics of external measurable variables. Due to the system structure and The difference in parameters can only roughly set the fault protection threshold, and cannot make a judgment on the type of fault

The severe nonlinear characteristics of the switched reluctance motor system itself and the unique control method also bring great difficulty to the research of system fault diagnosis. The traditional power converter fault diagnosis method cannot be directly applied to the switched reluctance motor power converter. middle

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