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Predictive torque control method for dual motor drive system based on voltage vector preselection

A dual-motor drive, voltage vector technology, applied in the direction of multiple motor speed/torque control, motor generator control, electronic commutation motor control, etc., can solve the problem of increased system loss, phase current distortion, and system zero-sequence current It can reduce the pulsation, suppress the zero-sequence current, and reduce the amount of calculation

Active Publication Date: 2021-09-28
FUZHOU UNIV
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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.

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  • Predictive torque control method for dual motor drive system based on voltage vector preselection
  • Predictive torque control method for dual motor drive system based on voltage vector preselection
  • Predictive torque control method for dual motor drive system based on voltage vector preselection

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Embodiment Construction

[0136] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0137]The present invention proposes a dual-motor drive system predictive torque control method based on voltage vector pre-selection. The purpose has three aspects: one is to realize the precise control of the torque and stator flux amplitude of two PMSMs; the other is to realize the effective control of zero-sequence current The third is to reduce the calculation amount of predictive torque control algorithm. According to the six-phase current obtained by sampling, the torque and stator flux amplitude of two PMSMs are calculated, and compared with the given value, it is judged whether the torque and stator flux amplitude of the two PMSMs need to be increased or decreased, and then according to In the sectors where the stator flux vectors of the two PMSMs are located, 9-11 voltage vectors are preselected to control the two PMSMs. The ze...

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Abstract

The invention relates to a predictive torque control method for a dual motor drive system based on voltage vector preselection. According to the six-phase current obtained by sampling, the torque and stator flux amplitude of two PMSMs are calculated and compared with the given value to judge the increase or decrease of the torque and stator flux amplitude of two PMSMs. In the sector where the stator flux vector is located, 9-11 voltage vectors are preselected to control two PMSMs; a zero-sequence current PI regulator is introduced, and the output value is a given value of zero-sequence voltage, and each pre-selected voltage vector and inverter The No. 21 vector or No. 42 vector output by the generator is synthesized to synthesize a virtual voltage vector whose zero-sequence voltage is equal to the given value of the zero-sequence voltage to suppress the zero-sequence current of the system, and finally select the optimal virtual voltage vector through the predictive torque control algorithm in the next cycle. The invention reduces the torque of the two PMSMs and the pulsation of the amplitude of the stator flux linkage; suppresses the zero-sequence current of the system, improves the steady-state operation performance of the system; and reduces the calculation amount of the predictive torque control algorithm.

Description

technical field [0001] The invention relates to a predictive torque control method for a dual-motor drive system based on voltage vector preselection. Background technique [0002] A six-phase series-connected three-phase double permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) drive system is a commonly used dual PMSM drive system. The six-phase series-connected 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, and utilizes the redundant degrees of freedom of the six-phase PMSM to realize 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 m...

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 周扬忠潘斌屈艾文钟天云
Owner FUZHOU UNIV
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