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IGBT stuck-open fault diagnosis method for three-phase inverter bridge of frequency converter

A technology of three-phase inverter bridge and open-circuit faults, which is applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve problems such as misdiagnosis, and achieve the effect of avoiding misdiagnosis

Inactive Publication Date: 2011-05-11
HARBIN INST OF TECH
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  • Summary
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Problems solved by technology

[0019] The invention provides a method for diagnosing the open-circuit fault of the IGBT of the three-phase inverter bridge of the frequency converter, which solves the problem of misdiagnosis caused by the sudden increase or decrease of the load by using the Park vector method to judge the open-circuit fault of the IGBT of the inverter bridge

Method used

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  • IGBT stuck-open fault diagnosis method for three-phase inverter bridge of frequency converter
  • IGBT stuck-open fault diagnosis method for three-phase inverter bridge of frequency converter
  • IGBT stuck-open fault diagnosis method for three-phase inverter bridge of frequency converter

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specific Embodiment approach 1

[0043] Specific implementation mode one: the following combination figure 1 and Figure 9 Describe this implementation mode, this implementation mode comprises the following steps:

[0044] Step 1: collecting the three-phase current i of the stator of the motor whose speed is controlled by the frequency converter a ib and i c ;

[0045] Step 2: The three-phase current i is analyzed by discrete Fourier transform a i b and i c Transform to obtain the three-phase current i a i b and i c DC component amplitude and cosine component a of fundamental wave component amplitude j，k and the sine component b j，k , as shown in the following formula:

[0046] a j , k = 1 N Σ n = 0 N - 1 i j ( ...

specific Embodiment approach 2

[0057] Embodiment 2: This embodiment is a further description of Embodiment 1. In the step 4, the DC component is normalized according to the value h j The specific method for judging the faulty phase of the three-phase inverter bridge is as follows:

[0058] when max(|h j |) > 1, set f 2，j = 1, it means that the three-phase inverter bridge has an open-circuit fault; otherwise, f 2，j =0, it means that the three-phase inverter bridge has no fault. Others are the same as the first embodiment.

specific Embodiment approach 3

[0059] Specific implementation mode three: the following combination figure 1 , Figure 6 to Figure 8 This embodiment is described. This embodiment is a further description of Embodiment 2. In the step 5, the specific method for judging the failure of the upper tube and the lower tube of the fault phase is as follows:

[0060] when h j >0, set f 1，j = 1, it means down tube failure, otherwise f 1，j =0, it means the upper tube is faulty. Others are the same as the second embodiment.

[0061] Normalize the value h according to the DC component in step 4 j The specific method of judging the faulty phase of the three-phase inverter bridge can be known. When the absolute value of a certain phase is the largest after normalization and exceeds the threshold value 1, it is determined that the phase of the three-phase inverter bridge has an open circuit fault. Use f 2，j =1 means, use f 2，j =0 indicates that the system has no faults. It can be known by the specific method of dete...

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Abstract

An IGBT (insulated-gate bipolar transistor) stuck-open fault diagnosis method for a three-phase inverter bridge of a frequency converter belongs to the technical field of IGBT fault diagnosis of three-phase inverter bridges and solves problem that misdiagnosis is caused in instant load or instant unload when stuck-open fault of IGBTs of an inverter bridge is determined through the Park vector method. The method comprises the following steps: firstly, three phase currents ia, ib and ic of a motor stator used for speed regulation and controlled by the frequency converter are collected; secondly, the three phase currents ia, ib and ic are transformed through discrete Fourier transform to obtain cosine component aj, k and sine component bj, k of direct current component amplitude and fundamental component amplitude of the three phase currents ia, ib and ic; thirdly, the direct current component amplitude is normalized through the fundamental component amplitude to obtain a direct current component normalization value hj; fourthly, a fault phrase of the three-phase inverter bridge is determined according to the direct current component normalization value hj; and then whether the faultphrase is in an upper transistor or a lower transistor is determined. The invention is suitable for fault diagnosis of three-phase inverter bridges.

Description

technical field [0001] The invention relates to a method for diagnosing an IGBT open-circuit fault of a frequency converter three-phase inverter bridge, and belongs to the technical field of IGBT fault diagnosis of a three-phase inverter bridge. Background technique [0002] The speed control system composed of frequency converter and motor is a complex electronic system, which is easily damaged by the influence of electromagnetic environment. In industrial applications, the continuity of the production process requires that the inverter system cannot be shut down after a fault occurs, otherwise it will cause huge economic losses. Due to the improvement of system automatic maintenance performance requirements, the fault diagnosis and fault-tolerant control of frequency converters have received great attention. Only when the fault point is detected accurately can fault-tolerant control be carried out for this fault. Therefore, fault diagnosis is the basis of fault-tolerant c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 于泳杨荣峰王高林蒋生成
Owner HARBIN INST OF TECH
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