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A predictive torque control method for dual-motor drive system without weight coefficient

A dual-motor drive, torque prediction technology, applied in multiple motor speed/torque control, motor generator control, AC motor control, etc. It can effectively suppress the zero-sequence current, eliminate the weight coefficient, and reduce the amount of calculation.

Active Publication Date: 2021-09-28
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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  • A predictive torque control method for dual-motor drive system without weight coefficient
  • A predictive torque control method for dual-motor drive system without weight coefficient
  • A predictive torque control method for dual-motor drive system without weight coefficient

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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 predictive torque control method for a dual-motor drive system without weight coefficients. Provide a six-phase series-connected three-phase dual PMSM drive system. According to the information obtained by system sampling including six-phase current, DC bus voltage, and position angle, the expected voltage and zero point of controlling the two PMSMs in the static coordinate system are obtained through the PI regulator. The expected value of the sequence voltage, and then the T 6 The expected value of the six-phase phase voltage is obtained by the inverse transformation of the matrix, and 64 switch states are substituted into the cost function based on the error of the six-phase phase voltage, so that the switch state with the smallest cost function value acts on the next cycle of the system. The invention realizes accurate control of torque and stator flux amplitude of two PMSMs and effective suppression of zero-sequence current; saves cumbersome weight coefficient setting work; and greatly reduces calculation amount of predictive torque control algorithm.

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 Patents(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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