Fault Diagnosis Method of Inverter Power Tube Open Circuit in Permanent Magnet Synchronous Motor Control System

Abstract

The invention relates to an inverter power tube open circuit fault diagnosis method in a permanent magnet synchronous motor control system. According to the method, a differential current state observer is designed based on a voltage balance equation to estimate the ideal differential current of the permanent magnet synchronous motor, and the distortion amount of the motor differential current isestimated by combination of the measured value of the differential current; and then a corresponding fault detection and positioning algorithm is designed according to the distortion rule of the motordifferential current caused by faults, so that the rapid and accurate on-line fault diagnosis of the circuit fault of the inverter switch tube is realized. The method has the advantages of being highin anti-jamming capability, strong in robustness, high in detection speed, high in detection accuracy and the like. In addition, the method can also be suitable for motor speed stabilization and speed change stages, and is suitable for two different modulation modes (a spatial voltage pulse width modulation mode or a carrier-based pulse width modulation mode). Therefore, the method is a universalvoltage source type inverter single switch tube open circuit fault diagnosis method.

Description

technical field [0001] The invention relates to a method for diagnosing an open circuit fault of an inverter power tube in a permanent magnet synchronous motor control system, which is used for online real-time detection of an open circuit fault of a switch tube in an inverter and can locate the source of the fault. Background technique [0002] Permanent magnet synchronous motors are widely used in industry, military, aerospace and other fields because of their advantages such as wide speed range, good dynamic response, strong controllability, and high power factor. The open circuit fault of the inverter switching tube is one of the most common faults in the permanent magnet synchronous motor control system. It will greatly reduce the control performance of the motor, increase the power consumption of the motor, and may lead to catastrophic accidents in extreme cases. In order to avoid the above-mentioned unfavorable factors, it is necessary to study the diagnosis method of...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in the traditional inverter switching tube open circuit fault diagnosis method, either additional sensors need to be added to introduce a new fault source, or there is a narrow application range (cannot be applied to the motor speed change stage), Problems such as slow detection speed and poor anti-interference ability

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