Asymmetric six-phase PMSM model prediction flux linkage control method considering duty ratio optimization

Abstract

The invention discloses an asymmetric six-phase PMSM model prediction flux linkage control method considering duty ratio optimization. The method comprises the following steps: firstly, constructing 12 active virtual voltage vectors and 1 zero virtual voltage vector by utilizing a vector synthesis principle, and realizing the harmonic current suppression of a harmonic sub-plane while reducing a vector to be evaluated; secondly, constructing a value function only involving stator flux linkage and eliminating the problem of weight coefficient adjustment caused by traditional model prediction torque control; thirdly, evaluating 13 virtual voltage vectors by using the value function and calculating a corresponding value function value; and finally, determining an optimal action vector set, calculating the duty ratio of vectors in the set, and outputting a corresponding PWM pulse to act on an inverter. According to the method, the calculation burden of the system can be reduced, the harmonic current of the harmonic sub-plane is suppressed, the steady-state performance of the system is improved, the switching frequency of the inverter is fixed, and the advantage of fast dynamic responseof traditional model prediction control is reserved.

Description

technical field [0001] The invention relates to an asymmetrical six-phase PMSM model prediction flux linkage control method considering duty ratio optimization, which belongs to the field of motor drive and control. Background technique [0002] With the development of power electronics technology and high-performance microprocessors, multi-phase motor drive technology has gradually entered people's field of vision. Compared with three-phase motors, multi-phase motors have many significant advantages, such as high fault tolerance, high power density, low torque ripple, high efficiency, and lower single-phase power rating, etc., and are very suitable for high-power application scenarios, such as Electric vehicles, ship propulsion, etc. Among various multi-phase motor topologies, since the asymmetric six-phase PMSM eliminates the sixth harmonic and the resulting torque ripple, this topology has become a research hotspot among scholars at home and abroad. [0003] Model predi...

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Problems solved by technology

At present, the model predictive control algorithm extended to asymmetric six-phase PMSM still has problems such as poor steady-state performance, unstable switching frequency, and difficult adjustment of weight coefficients.

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