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An asymmetric six-phase pmsm model predictive flux linkage control method considering duty cycle optimization

A model prediction and control method technology, applied in control systems, generator control, vector control systems, etc., can solve the problems of difficult adjustment of weight coefficients, poor steady-state performance, and unfixed switching frequency, etc., to achieve superior dynamic performance and improve Steady-state performance effects

Active Publication Date: 2022-03-04
NANTONG UNIVERSITY
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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.

Method used

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  • An asymmetric six-phase pmsm model predictive flux linkage control method considering duty cycle optimization
  • An asymmetric six-phase pmsm model predictive flux linkage control method considering duty cycle optimization
  • An asymmetric six-phase pmsm model predictive flux linkage control method considering duty cycle optimization

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Embodiment Construction

[0058] The present invention will be further explained below in conjunction with the accompanying drawings.

[0059] like figure 1 As shown, an asymmetric six-phase PMSM model predictive flux linkage control method considering duty cycle optimization includes the following steps:

[0060] Step 1: Sampling the DC bus voltage u of the main circuit 1 dc , rotational speed n, rotor angle θ, six-phase stator current i abc with i uvw .

[0061] Step 2: Use the coordinate transformation module 2 to calculate the stator current i in the dq coordinate system d with i q . Specifically, first use the vector space decoupling matrix T αβ Find the fundamental sub-plane current i α with i β , harmonic sub-plane current i x with i y ,as follows

[0062]

[0063] In the formula, i o1 with i o2 The zero-sequence sub-plane component, for the dual-neutral asymmetric six-phase PMSM involved in the present invention, i o1 with i o2 Both are 0. Then, use the Park transformation m...

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Abstract

The invention discloses an asymmetrical six-phase PMSM model prediction flux linkage control method considering duty cycle optimization. First, 12 active virtual voltage vectors and 1 zero virtual voltage vector are constructed by using the principle of vector synthesis to reduce the number of vectors to be evaluated and at the same time realize harmonic current suppression in the harmonic sub-plane; secondly, construct a value function involving only the stator flux linkage , to eliminate the weight coefficient adjustment problem caused by the traditional model predictive torque control; again, use the value function to evaluate the 13 virtual voltage vectors, and calculate the corresponding value function value; finally, determine the optimal action vector set, and calculate the value of the vector in the set Duty cycle, output the corresponding PWM pulse to act on the inverter. The method of the invention can not only reduce the calculation burden of the system, suppress the harmonic current of the harmonic sub-plane, improve the steady-state performance of the system, fix the switching frequency of the inverter, but also retain the advantage of fast dynamic response of the traditional model predictive control.

Description

technical field [0001] The invention relates to an asymmetric six-phase PMSM model prediction flux linkage control method considering duty cycle optimization, and belongs to the field of motor drive and control. Background technique [0002] With the development of power electronic 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 ratings, which are very suitable for high-power application scenarios, such as Electric vehicles, marine propulsion, etc. Among various multi-phase motor topologies, since the asymmetric six-phase PMSM eliminates the sixth harmonic and the torque ripple caused by it, this topology has become a research hotspot of scholars at home and abroad. [0003] Model predictive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/12H02P21/00H02P27/08
CPCH02P21/141H02P21/12H02P21/0017H02P27/08
Inventor 於锋刘兴胡德林葛天天
Owner NANTONG UNIVERSITY
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