Main switch fault detection method for asymmetric half-bridge-type power converter of switched reluctance motor

A technology for switched reluctance motors and power converters, applied in the field of speed-regulated motors, can solve the problems of limited diagnostic content and scope of application, fault feature quantities, increased system cost and complexity, etc., and achieves a simple, convenient and low-cost detection method. , the effect of a wide range of practical engineering application value

Pending Publication Date: 2017-06-27
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods usually obtain relevant information by adding additional sensors to obtain fault feature quantities, which increases the cost and complexity of the system, and limits the diagnostic content and scope of application.

Method used

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  • Main switch fault detection method for asymmetric half-bridge-type power converter of switched reluctance motor
  • Main switch fault detection method for asymmetric half-bridge-type power converter of switched reluctance motor
  • Main switch fault detection method for asymmetric half-bridge-type power converter of switched reluctance motor

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: When the switched reluctance motor is running at high speed with load, the open circuit fault detection of the normally closed main switch is performed.

[0036] Such as figure 1 As shown, it is a three-phase switched reluctance motor asymmetrical half-bridge power converter topology. Winding A, winding B, and winding C are three-phase windings of switched reluctance motor. Each phase winding is composed of two main switches QU, QL is connected to two freewheeling diodes VD1 and VD2, and US is the DC power supply voltage. In practice, the single-tube chopping method is often used. During the conduction period of the A-phase winding, the upper main switch QUa is always closed, which is called a "normally closed" main switch, and the lower main switch QLa implements chopping control, which is called a "chopping" main switch. . The power supplies power to the winding. When the lower main switch is closed, the voltage at both ends of the conducting phase win...

Embodiment 2

[0069] Embodiment 2: When the switched reluctance motor is running at low speed with load, open-circuit fault detection of the chopper main switch.

[0070] The main circuit topology and detection process of the three-phase asymmetrical half-bridge power converter are the same as those in the first embodiment. When the three-phase switched reluctance motor is running, when the speed n=550r / min, the load T L=5N·m, the actual fault detection results are as follows Figure 4 shown. 285ms ago, element E AB =E AC =E BC =0, after this moment, I C down to zero, I A with I B but remain the same. After another 0.7ms, |E AC |=|E BC |=0.2>0.05, |E AB |=0AC >p o ,E BC >p o , belongs to the situation ③ in Table 1, then it can be diagnosed that the main switch fault type is open circuit, and the fault phase is C phase.

Embodiment 3

[0071] Embodiment 3: When the switched reluctance motor is running at high speed with load, the normally closed main switch short-circuit fault detection.

[0072] The main circuit topology and detection process of the three-phase asymmetrical half-bridge power converter are the same as those in the first embodiment. When the three-phase switched reluctance motor is running, when the speed n=2000r / min, the load T L =5N·m, the actual fault detection results are as follows Figure 5 shown. 725ms ago, element E AB =E AC =E BC =0, after this moment, I B down to zero, I A with I C but remain the same. After another 0.4ms, |E AB |=|E BC |=0.2>0.05, |E AC |=0BC >p s ,E AB s , belongs to the situation ⑤ in Table 1, then it can be diagnosed that the main switch fault type is short circuit, and the fault phase is B phase.

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Abstract

The invention discloses a main switch fault detection method for an asymmetric half-bridge-type power converter of a switched reluctance motor. The method comprises the following steps: detecting the instantaneous value of each phase current of the switched reluctance motor power converter, calculating the difference between the two of the normalized current averages, and treating each difference as an element to construct the fault feature quantity set Ek; determining the condition which the element in the set belongs to in the fault diagnosis table by comparing the relationship between the elements in the set and the diagnostic threshold; detecting the fault occurrence, the fault type and the fault phase according to condition details in the table; if the fault type is open, identifying the fault element by calculating the demagnetization time of the fault phase current; and if the fault type is short circuit, identifying the faulty element by judging the main switch on and off state. The method can precisely and rapidly detect the fault details, is suitable for a variety of phases of switched reluctance motor power converters without adding any additional sensors, and is high in versatility, high in reliability and good in implementation effect.

Description

technical field [0001] The invention relates to the field of speed-regulating motors, more specifically, an on-line detection method for main switch faults of asymmetrical half-bridge power converters of switched reluctance motors, which is applicable to asymmetrical half-bridges of switched reluctance motors with various phase numbers type power converter without adding any additional sensors. Background technique [0002] Switched reluctance motor is a new type of speed-regulating motor with simple structure, low cost, good robustness and high reliability. It has been widely used in aerospace, new energy vehicles, household appliances and many other fields. Inherent fault tolerance is one of the outstanding advantages of the switched reluctance motor speed control system, but better fault tolerance does not mean that the entire system is free from faults. The power converter, as the energy provider for the operation of the switched reluctance motor, is one of the importan...

Claims

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Application Information

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IPC IPC(8): G01R31/34
CPCG01R31/34
Inventor 肖丽潘旭华陈雷姜书浩苏晓勤申芳
Owner TIANJIN UNIV OF COMMERCE
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