Current based open-circuit fault detection method for three-phase inverter

A three-phase inverter, open-circuit fault technology, applied in the direction of measuring electrical variables, instruments, measuring electricity, etc., can solve the problems of excessive calculation, increased calculation amount, slow detection, etc., to achieve small overall calculation amount, fast speed, avoidance of The effect of false alarms

Inactive Publication Date: 2015-05-06
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] (1) It can only detect and locate the open-circuit fault of a single switching tube of the inverter, but cannot detect the open-circuit fault of multiple switching tubes at the same time. To detect multi-tube open-circuit faults, additional detection variab

Method used

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  • Current based open-circuit fault detection method for three-phase inverter
  • Current based open-circuit fault detection method for three-phase inverter
  • Current based open-circuit fault detection method for three-phase inverter

Examples

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Example Embodiment

[0043] Example

[0044] figure 2 It is a flowchart of the current-based three-phase inverter open-circuit fault detection method of the present invention.

[0045] In this embodiment, as figure 2 As shown, the current-based three-phase inverter open-circuit fault detection method of the present invention includes the following steps:

[0046] (1) Get the motor three-phase current i from the motor drive control system n (n=a, b, c);

[0047] (2) According to the three-phase current of the motor i n Calculate each phase detection variable d n (n=a, b, c)

[0048] d n = 3 ( | i n | > - 2 i n > ) | i a | > + | i b | > + | i c | >

[0049] among them,

[0050] i n > = w 2 π ∫ 0 2 π w i n dt

[0051] | i n | > = w 2 π ∫ 0 2 π w | i n | dt

[0052] among them, n > Is the three-phase current ...

Example Embodiment

[0062] Instance

[0063] In this embodiment, it is assumed that the three-phase AC asynchronous motor has a rated power of 1.1kW, a rated speed of 1390rpm, a rated torque of 7.6Nm, a rated current of 2.89A, and the detection variable threshold k 1 = -0.3, k 2 = 0.3, k 3 = 1.8, k 4 = 3.3.

[0064] image 3 Is the motor three-phase current and the detection variable d n Waveform graph.

[0065] In this embodiment, as image 3 As shown, when the motor is at rated speed and 50% rated load, at time t=2s, T1 has an open circuit fault; at t=2.2s, T1 and T2 both have open circuit faults; at t=2.4s, T1 T2 and T3 have open circuit faults at the same time; the details are as follows:

[0066] When t=1.8~2s:

[0067] Such as image 3 (a) shows that the motor phase current i a Is a symmetrical sine wave, then d a ≈1, fault indication D a =0; such as image 3 (b) shows that the motor phase current i b Is a symmetrical sine wave, then d b ≈1, fault indication D b =0; such as image 3 (c) shows that t...

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Abstract

The invention discloses a current based open-circuit fault detection method for a three-phase inverter. The method comprises the steps of acquiring motor three-phase current in through a motor driving control system; performing weight processing for the cycle average value of the three-phase current and the cycle average value of an absolute value; normalizing to obtain a detection variable dn; comparing the detection variable dn with the preset threshold ki to obtain a fault indicator Dn of the three-phase inverter; positioning an inverter switching tube suffering from open-circuit fault from a fault positioning table according to the fault indicator Dn. The method is simple and easy to be carried out, and is suitably integrated to the control system.

Description

technical field [0001] The invention belongs to the technical field of three-phase inverter fault detection, and more specifically relates to a current-based three-phase inverter open-circuit fault detection method. Background technique [0002] With the widespread use of motor speed control systems in industrial applications, the safety of speed control systems has increasingly become the focus of attention. As an important part of the speed control system, the motor drive system's reliability is crucial to the safe operation of the speed control system. However, the reliability of the motor drive system is mainly affected by the power devices of the three-phase inverter. In order to improve the safety of the speed control system, the fault of the three-phase inverter is detected and located effectively in real time, and the corresponding fault-tolerant control is applied. appear indispensable. [0003] The power device failures of three-phase inverters can be attributed ...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 凡时财徐安平邹见效徐红兵
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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