Fifteen-phase asynchronous motor rotor broken bar number high-precision diagnosis method based on ESPRIT-PSA and LGBM

Abstract

The invention relates to a Fifteen-phase asynchronous motor rotor broken bar number high-precision diagnosis method based on ESPRIT-PSA and LGBM. According to the method, for an instantaneous reactive power signal sampled in a short time (only 2 seconds), an accurate amplitude Aq of a characteristic component in the instantaneous reactive power signal is obtained by using an ESPRIT (Rotation Invariant Signal Parameter Estimation Technology) and a PSA (Pattern Search Algorithm); corresponding 71 characteristics such as voltage amplitude, current amplitude, average active power P and average reactive power Q are obtained; the method then includes determining Aq and the first five features, namely Aq, P and Q, a first phase voltage amplitude Um and a first phase current amplitude Im, in the 71 features according to an LGBM (Light Gradient Elevator) so as to form a data set, wherein the first five features include Aq, P and Q, and the first phase voltage amplitude Um and the first phase current amplitude Im; and then training and storing an LGBM model and carrying out high-precision diagnosis on the number of broken bars of the rotor (the training precision and the test precision are both 100%, and the five-fold cross validation accuracy is 99.38%).

Description

technical field [0001] The invention relates to a method capable of diagnosing the number of broken bars of a fifteen-phase asynchronous motor rotor, which belongs to the technical field of fault diagnosis. Background technique [0002] Because of its high reliability, fault-tolerant operation and many other advantages, fifteen-phase asynchronous motors have been used in special fields such as ships and submarines. Broken rotor bar is a typical failure mode of fifteen-phase asynchronous motor, so the fault diagnosis of broken rotor bar plays an important role in improving the reliability of fifteen-phase asynchronous motor operation. [0003] When a fifteen-phase asynchronous motor has broken rotor bars, it will appear in its stator current with a frequency of (1±2s)f 1 (s is the slip rate, f 1 is the side frequency component of the power supply frequency). The method for diagnosing the broken rotor bar by examining the side frequency component is called the motor stator ...

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Problems solved by technology

[0006] At present, the analysis method of the instantaneous reactive power signal of the motor has provided a diagnostic formula for the number of broken bars of the rotor, but in practical applications, there is a large deviation between the diagnostic results and the actual number of broken bars of the rotor.

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