Prediction torque control system and method of three-phase switch reluctance motor

Abstract

The invention discloses a prediction torque control system and method of a three-phase switch reluctance motor. The system comprises a power supply power source, a power converter, a signal collector, a rotating speed controller and a prediction torque controller. According to the system states (rotating speed, position, current and bus voltage) at the current moment, the corresponding system state at the next moment is predicted on line in a mode of traversing all possible switch vectors of a current sector; the optimum switch vector of a minimum evaluation function is selected to be used as a control signal to be output; a good inhibition effect is achieved on the torque pulsation; the torque inverse characteristic calculation is avoided; and the making of a complicated hysteresis control rule is not needed. A plurality of performance indexes such as torque pulsation, copper loss, power converter switch frequency and the like are comprehensively considered through regulating weight factors in the evaluation function; the system efficiency can be improved; and the switch loss can be reduced, and the service life of a switch tube can be prolonged, so that good flexibility and expansibility are realized.

Description

technical field [0001] The invention relates to a three-phase switched reluctance motor torque control technology, in particular to a three-phase switched reluctance motor predictive torque control system and method. Background technique [0002] Three-phase switched reluctance motor (Switched Reluctance Motor, SRM) has the advantages of simple structure, large starting torque, wide speed range, high reliability and high efficiency. The field has broad application prospects. However, the doubly salient pole structure and the pulse power supply mode of the three-phase switched reluctance motor lead to a large instantaneous torque ripple. Torque ripple will increase motor noise and directly cause speed fluctuations, especially at low speeds, which greatly limits the application of three-phase switched reluctance motors in high-performance applications. [0003] Existing control methods for suppressing torque ripple of three-phase switched reluctance motors can be mainly divi...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the switching frequency is too high and a complex hysteresis control rule needs to be formulated

Images