Open-circuit fault diagnosis method for doubly salient motor power converter 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: 2022-04-26
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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  • Open-circuit fault diagnosis method for doubly salient motor power converter based on bus current
  • Open-circuit fault diagnosis method for doubly salient motor power converter based on bus current
  • Open-circuit fault diagnosis method for doubly salient motor power converter 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 method for diagnosing an open-circuit fault of a doubly salient motor power converter based on bus current, and relates to the technical field of motor control. The method includes: acquiring the absolute value of the DC bus current and the position signal of the motor rotor; determining the power converter according to the position signal If the absolute value of the DC bus current is less than the zero current threshold and the duration exceeds the time threshold, it is determined that the power converter has an open-circuit fault; turn off the power tubes whose drive signals are high in the current working state in turn, and compare them in turn Whether the absolute value of the DC bus current is still less than the zero current threshold; if not, determine that the other power tube is open when it is turned off; if the results of the two comparisons are both yes, then turn on the power tube to be driven in the previous working state , Combined with the next working state, observe the change of the DC bus current to assist in locating the fault location. The fault diagnosis cost of this method is low, the fault diagnosis time is shortened, and it is not affected by changes in rotational speed and load.

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 Patents(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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