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Fault-tolerant control method for short-circuit fault of power converter in switched reluctance motor

A technology of switched reluctance motors and power converters, which is applied in motor control, AC motor control, and control systems, and can solve problems such as increased system failure rates, poor fault-tolerant control effects, and easy program crashes

Active Publication Date: 2019-08-16
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The use of complex algorithm control can obtain better fault-tolerant effects, but the implementation is complex, which cannot meet the real-time requirements of the system, and the program is prone to crash
[0008] 2. Using a simple control algorithm, the effect of fault-tolerant control is poor
[0009] 3. Using hardware topology fault-tolerant control, adding more power devices can achieve better fault-tolerant control effect, and the system cost will increase significantly. At the same time, the increase of power devices will also increase the system failure rate

Method used

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  • Fault-tolerant control method for short-circuit fault of power converter in switched reluctance motor
  • Fault-tolerant control method for short-circuit fault of power converter in switched reluctance motor
  • Fault-tolerant control method for short-circuit fault of power converter in switched reluctance motor

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Embodiment Construction

[0081] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0082] figure 1 It is the relationship diagram of the phase inductance and the rotor position angle of the switched reluctance motor of the present invention. The torque output of the switched reluctance motor is closely related to the phase inductance and phase current, and the phase inductance changes periodically with the rotor position. When conduction is performed in the phase inductance rising region, the conduction phase provides positive torque for the switched reluctance motor system; when conduction is performed in the phase inductance decline region, the conduction phase provides negative torque for the switched reluctance motor system. Therefore, when a short-circuit fault occurs in the power converter in the switched reluctance motor system, the conduction interval of the fault phase is adjusted in combination with the characteristics of the pha...

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Abstract

The invention discloses a fault-tolerant control method for the short-circuit fault of a power converter in a switched reluctance motor. For the short-circuit fault of a power switch tube in a three-phase asymmetric half-bridge structure, current soft chopper control is used as a basic control algorithm, and the de-rating factor is selected according to different fault conditions. The current overshoot of a faulty phase is restrained by shortening the conduction angle, and the waveform and amplitude of the phase current of a healthy phase are changed in real time to compensate for the adverseeffect of the current of the faulty phase on the output torque. Finally, the voltage across the two ends of the circuit of the conducting phase is locally adjusted by adjusting the duty cycle of the power switch tube in the three-phase circuit, so that the fault torque ripple of the switched reluctance motor system under service in de-rated capacity can be further optimized. The hardware cost is not increased. The control algorithm is simple and feasible, achieves a good fault torque ripple suppressing effect and has good engineering application value.

Description

technical field [0001] The invention belongs to the technical field of switched reluctance motors, and in particular relates to a fault-tolerant control method for a short-circuit fault of a power converter of a switched reluctance motor. Background technique [0002] Switched Reluctance Motor (SRM) is a new type of motor developed in the 1980s. The motor has the advantages of simple structure, solid body, high reliability, many controllable parameters, wide speed range, etc. It is favored in industrial applications and has been used in electric vehicles, household appliances, general industry, aviation and other fields. Different degrees of application and development. [0003] The power converter used in the switched reluctance motor drive (Switched Reluctance Motor Drive, SRD) is generally an asymmetrical half-bridge power converter structure, and its phase circuits are independent of each other, with strong stability and good fault tolerance, which makes the SRM phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/092H02P25/098H02P29/028
CPCH02P29/028H02P25/092H02P25/098
Inventor 马铭遥王瑞杨淑英李飞杨晴晴
Owner HEFEI UNIV OF TECH
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