Permanent magnet synchronous motor three-vector model predictive torque control method based on voltage vector screening and optimization

Abstract

A permanent magnet synchronous motor three-vector model predictive torque control method based on voltage vector screening and optimization comprises: firstly, converting control over torque and stator flux linkage amplitude into control over a stator flux linkage vector, constructing a value function based on stator flux linkage vector errors, and therefore the design process of weight coefficients is omitted; secondly, dividing a voltage space vector complex plane into four quadrants according to polarities of a real part and an imaginary part of a stator flux linkage vector error by deriving a relationship between the stator flux linkage vector error and a reference voltage vector, so as to determine the quadrant where the reference voltage vector is located; selecting two groups of voltage vector combinations according to the selected quadrant, wherein each group of voltage vector combinations comprises two non-zero voltage vectors and a zero voltage vector; for each group of voltage vector combination, respectively calculating duty ratios of the three voltage vectors according to the torque error and the flux linkage error, and dividing one control period into three parts; andfinally, obtaining an optimal voltage vector combination by minimizing a value function.

Description

technical field [0001] The invention relates to a three-vector model predictive torque control method for a permanent magnet synchronous motor based on voltage vector screening and optimization, which belongs to the field of motor drive and control. Background technique [0002] Permanent magnet synchronous motors have the advantages of simple structure, low noise, and high power density, and have been widely used in aerospace, railway transportation, numerical control machine tools, electric vehicles, and robot control. The control method of permanent magnet synchronous motor has also become a research hotspot of scholars at home and abroad. In the field of AC speed regulation, in addition to vector control and direct torque control, model predictive torque control has been favored by more and more scholars. [0003] The traditional model predictive torque control needs to traverse 7 basic voltage vectors in one sampling cycle, and one voltage vector is applied in each cont...

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Problems solved by technology

[0004] Technical problem: The present invention aims at the problem that the existing technology cannot solve the problem of large torque ripple and flux linkage ripple, and provides a three-vector model predictive torque control method for permanent magnet synchronous motors based on voltage vector screening and optimization, so as to improve the permanent magnet synchronous motor. Steady-state performance of synchronous motors

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