Fault Tolerant Control Method for Switched Reluctance Motor Power Converter Short Circuit Fault

Abstract

The invention discloses a fault-tolerant control method for a short-circuit fault of a switched reluctance motor power converter. This method aims at the short-circuit fault of the power switch tube in the three-phase asymmetrical half-bridge structure, uses the current soft chopping control as the basic control algorithm, and selects the derating factor according to different fault conditions. For the fault phase, the method of shortening the conduction angle is used to suppress the overshoot of the fault phase current. For the healthy phase, the waveform and amplitude of the phase current are changed in real time to compensate for the adverse effect of the fault phase current on the output torque. Finally, by adjusting the three The duty cycle of the power switch tube in the phase circuit can locally adjust the voltage at both ends of the conduction phase circuit, so that the fault torque ripple of the switched reluctance motor system under derating operation can be further optimized. The invention does not increase the cost of hardware, the control algorithm is simple and easy to implement, and a better effect of suppressing fault torque ripple is obtained, which 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 ...

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

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