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

A permanent magnet synchronous motor and control system technology, which is applied in electrical testing/monitoring, complex mathematical operations, continuity testing, etc., and can solve the problems of slow detection speed, inapplicability, and narrow scope of application.

Active Publication Date: 2020-11-06
BEIHANG UNIV
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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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  • Fault Diagnosis Method of Inverter Power Tube Open Circuit in Permanent Magnet Synchronous Motor Control System
  • Fault Diagnosis Method of Inverter Power Tube Open Circuit in Permanent Magnet Synchronous Motor Control System
  • Fault Diagnosis Method of Inverter Power Tube Open Circuit in Permanent Magnet Synchronous Motor Control System

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Embodiment Construction

[0119] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0120] Figure 4 It is a structural diagram of the present invention, wherein 1 represents the coordinate inverse transformation module, 2 represents the voltage command correction module, 3 represents the counter electromotive force calculation module, 4 represents the differential current observer module, 5 represents the current differential operation module, and 6 represents the low Pass filtering module, 7 represents the residual amplitude and direction calculation module, 8 represents the fault detection and location module. These eight modules work together to

[0121] Algorithm flow chart of the present invention is as Figure 5 shown, where each step corresponds to Figure 4 One or more modules in:

[0122] After the system boots, the whole algorithm starts:

[0123] ①Assign the initial value. In this step, all variables involved...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/54G05B23/02G06F17/11G06F17/15
CPCG06F17/11G06F17/15
Inventor 周新秀孙军韩邦成郑世强李海涛
Owner BEIHANG UNIV
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