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Weight-coefficient-free double-motor driving system predictive torque control method

A dual-motor drive and torque prediction technology, which is applied in multiple motor speed/torque control, motor generator control, AC motor control, etc., can solve the problems of system loss increase, phase current distortion, and system zero-sequence current overshoot. Major and other issues

Active Publication Date: 2020-08-25
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the system, if the last degree of freedom is not effectively controlled, the zero-sequence current of the system will be too large
Larger zero-sequence current will lead to distortion of phase current and increase of system loss, etc.

Method used

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  • Weight-coefficient-free double-motor driving system predictive torque control method
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  • Weight-coefficient-free double-motor driving system predictive torque control method

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Embodiment Construction

[0084] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0085] The invention proposes a predictive torque control method for a dual-motor drive system without weight coefficients. The purpose has three aspects: one is to realize the precise control of the torque and stator flux amplitude of the two PMSMs and the effective suppression of the zero-sequence current; the other is to eliminate the weight coefficient of the cost function in the predictive torque control algorithm; the third is to reduce the predicted torque. Calculation amount of the moment control algorithm. According to the six-phase current, DC bus voltage, position angle and other information obtained by system sampling, the expected voltage and zero-sequence voltage expected value of the two PMSMs in the static coordinate system are obtained through the PI regulator, and then through T 6 The inverse transformation of the matri...

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Abstract

The invention relates to a weight-coefficient-free double-motor driving system predictive torque control method. The method comprises the steps of providing a six-phase series three-phase dual-PMSM driving system, according to information including six-phase current, direct-current bus voltage and a position angle obtained by system sampling, obtaining expected voltages and zero-sequence voltage expected values of two PMSMs under a static coordinate system through a PI regulator, obtaining an expected value of the six-phase phase voltage through the inverse transformation of a T6 matrix, substituting 64 switching states into a cost function based on a six-phase phase voltage error, and enabling the switching state with the minimum cost function value to act on the next period of the system. According to the invention, the accurate control of torques and stator flux linkage amplitudes of the two PMSMs and the effective suppression of zero-sequence current are realized; cumbersome weightcoefficient setting work is omitted; and the calculation amount of a predictive torque control algorithm is greatly reduced.

Description

technical field [0001] The invention relates to a predictive torque control method for a dual-motor drive system without weight coefficients. Background technique [0002] The six-phase series three-phase double permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) drive system is a commonly used dual-motor drive system. The six-phase series three-phase double permanent magnet synchronous motor drive system connects the U, V, and W phases of the three-phase PMSM to the AD, BE, and CF of the six-phase PMSM respectively, and realizes a single One inverter independently decouples and controls two PMSMs. Compared with the traditional single inverter controlling a single PMSM, the six-phase series-connected three-phase dual PMSM drive system has the advantages of small drive system size, low cost, and easy regenerative braking. It is used in iron and steel smelting, rewinding machines, electric Automobile, textile manufacturing and other industries have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/04H02P21/20H02P21/12H02P21/22H02P27/06
CPCH02P6/04H02P21/12H02P27/06H02P21/20H02P21/22
Inventor 周扬忠潘斌陈艳慧钟天云
Owner FUZHOU UNIV
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