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Inverter open-circuit fault online diagnosis method for motor control

A technology of open-circuit fault and diagnosis method, which is applied in the field of fault diagnosis, can solve problems such as delay, and achieve the effects of avoiding delay, ensuring accuracy, and reducing the amount of calculation

Active Publication Date: 2021-08-10
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method still uses the current cycle mean value method to realize the open circuit fault location. For the variable frequency current signal, the fault location result has a delay of one fundamental wave cycle.

Method used

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  • Inverter open-circuit fault online diagnosis method for motor control
  • Inverter open-circuit fault online diagnosis method for motor control
  • Inverter open-circuit fault online diagnosis method for motor control

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Embodiment Construction

[0082] The technical solutions of the present invention will be further described below with reference to the drawings.

[0083] figure 2 For the topology map of the inverter for motor control, the circuit topology, a circuit topology, an inverter, and a motor thereof include a DC power source, an inverter, and a motor.

[0084] The inverter is a voltage source type two-level inverter, including the same three-phase bridge arm, which is described as a U-phase bridge arm, V-phase bridge arm and W-phase bridge arm, u-phase bridge arm, V phase The bridge arm and W-phase bridge arm are connected in parallel with DC power. In the three-phase bridge arm, each phase bridge arm includes two switched tubes in reverse parallel diode, i.e., three-phase bridge arms comprise 6 switched tubes with reverse parallel diode, and 6 strip-to-parallel diodes The switch tube is recorded as switch tube g, respectively. e , E means the serial number of the switch, E = 1, 2, 3, 4, 5, 6, where g 1 , G 3 ,...

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Abstract

The invention provides an inverter open-circuit fault online diagnosis method for motor control, and relates to the technical field of fault diagnosis. The method comprises the steps of: collecting the three-phase output current of a motor, obtaining Park vectors under different phase sequences through phase sequence transformation, calculating a normalized Park vector, estimating the instantaneous amplitude of the normalized Park vector through a waveform continuation-Hilbert transformation method, and obtaining the open-circuit fault characteristics of a switching tube through calculation; obtaining a three-phase output current commutation mark; and according to the open-circuit fault characteristics of the switching tube obtained by calculating the instantaneous amplitudes of the normalized Park vector under different phase sequences, comparing the three-phase output current commutation sign with a set fault threshold to judge the fault type and category. According to the technology, the real-time performance of fault feature extraction can be well improved, and open-circuit fault diagnosis of the inverter power switching tube based on the three-phase output current is realized.

Description

Technical field [0001] The present invention relates to the field of fault diagnosis, and more particularly to an inverter opening fault online diagnosis method for motor control. Background technique [0002] Based on the inverter-driven AC motor frequency conversion speed control system, has the advantages of large energy density, high energy efficiency, and has been widely used in motor motion control. The inverter failure in the AC motor frequency conversion speed control is a typical fault of the AC motor speed control system, which has a probability of up to 38%. With the continuous improvement of the performance requirements of industrial production links, the reliability and safety requirements of the AC motor frequency conversion speed control system are also more stringent. Therefore, monitoring the online diagnosis of the inverter failure is particularly important to realize the online diagnosis of the inverter failure. [0003] Inverter failures typically include a sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54
CPCG01R31/54Y04S10/52
Inventor 许水清何启航陶松兵戴浩松王巨兴王健
Owner HEFEI UNIV OF TECH
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