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Doubly salient motor power converter open-circuit fault diagnosis method based on bus current

A double-salient motor and power converter technology, which is applied in continuity testing and other directions, can solve problems such as the influence of speed changes, and achieve the effect of reducing the cost of fault diagnosis

Active Publication Date: 2021-11-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although this method only needs one current sensor, it is only suitable for fault diagnosis at low speed due to the influence of speed changes

Method used

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  • Doubly salient motor power converter open-circuit fault diagnosis method based on bus current
  • Doubly salient motor power converter open-circuit fault diagnosis method based on bus current
  • Doubly salient motor power converter open-circuit fault diagnosis method based on bus current

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Embodiment Construction

[0048] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0049] This embodiment takes the power converter of an electrically excited doubly salient motor as an example to describe in detail, as figure 1 As shown, the three-phase windings of the electrically excited doubly salient pole motor are connected in star form, and the three-phase windings are A-phase windings, B-phase windings, and C-phase windings, and the power converter is driven by a bridge, including the DC power supply U dc , filter capacitor C 1 , the first to sixth power tubes Q 1 -Q 6 , the first to the sixth diode D 1 -D 6 and current sensors.

[0050] The first to sixth power tubes Q 1 -Q 6 collectors respectively and the corresponding first to sixth diodes D 1 -D 6 The cathodes are connected, the emitters are respectively connected to the corresponding first to sixth diodes D 1 -D 6 connected to the anode.

[0051] ...

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Abstract

The invention discloses a doubly salient motor power converter open-circuit fault diagnosis method based on bus current, and relates to the technical field of motor control, and the method comprises the steps: obtaining a DC bus current absolute value and a position signal of a motor rotor; determining the working state of the power converter according to the position signal; if the absolute value of the direct-current bus current is smaller than the zero current threshold value and the duration time exceeds the time threshold value, determining that the power converter has an open-circuit fault; sequentially turning off the power tubes with high-level driving signals in the current working state, and sequentially comparing whether the absolute value of the current of the direct-current bus is still smaller than a zero-current threshold value or not; if not, determining that the other power tube is in an open circuit when the power tube is turned off; and if the two comparison results are yes, conducting the power tube to be driven in the previous working state, and observing the current change of the direct current bus in combination with the next working state to assist in positioning the fault position. The method is low in fault diagnosis cost, shortens the fault diagnosis time, and is not influenced by rotation speed and load changes.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for diagnosing an open-circuit fault of a doubly salient motor power converter based on bus current. Background technique [0002] The power converter is a weak link with a high failure rate in the electrically excited doubly salient motor drive system, and the fault diagnosis of the power converter is the key to improving the reliability of the system. Power device faults are mainly divided into short-circuit faults and open-circuit faults. Among them, open-circuit faults will reduce the output of the motor and generate torque ripples, which will seriously cause secondary faults; short-circuit faults respond quickly and usually cause bridge arms to pass through. It is processed by converting it into an open-circuit fault through a hardware circuit, so the diagnosis of an open-circuit fault in a power converter is a hot research topic at present. At present, many ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54
CPCG01R31/54
Inventor 张义军周波房文静叶赛
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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