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Permanent magnet synchronous motor model prediction pulse sequence control method

A permanent magnet synchronous motor, pulse sequence technology, applied in motor control, motor generator control, AC motor control and other directions, can solve the problems of low steady-state control accuracy, discontinuous distribution of synthetic vectors, etc., to simplify the current prediction process, The effect of improving the control accuracy and reducing the amount of calculation

Active Publication Date: 2021-07-27
SOUTHWEST JIAOTONG UNIV +1
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Problems solved by technology

Although the existing model predictive control algorithm for suppressing common-mode voltage can effectively reduce the common-mode voltage of the inverter, only two non-zero voltage vectors are used in each control cycle, so the distribution of the resulting vector is discontinuous and stable. State control accuracy is low

Method used

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  • Permanent magnet synchronous motor model prediction pulse sequence control method
  • Permanent magnet synchronous motor model prediction pulse sequence control method
  • Permanent magnet synchronous motor model prediction pulse sequence control method

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Embodiment Construction

[0030] The version invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] The present invention takes the three-phase two-level inverter and the permanent magnet synchronous motor as the research object, and its topology is as follows figure 1 shown. In the three-phase two-level inverter, there are 8 voltage vectors in total, and the spatial distribution of each voltage vector is as follows: figure 2 shown. The common-mode voltage (CMV) of the three-phase inverter and permanent magnet synchronous motor system is the voltage between the midpoint of the load star connection and the midpoint of the DC bus, which can be expressed as

[0032]

[0033] Among them, U dc is the DC side voltage value, S i (i=a,b,c) sequentially represent the switching signals of the three-phase bridge arms of the inverter, when S i =1, the upper bridge arm is turned on; when S i =0, the lower bridge arm i...

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Abstract

The invention discloses a permanent magnet synchronous motor model prediction pulse sequence control method. The method specifically comprises the following steps: carrying out the current prediction and rolling optimization of six non-zero voltage vectors, and selecting a vector enabling a target function to be minimum as an initial vector; designing pulse sequences M and N, and selecting a standby pulse sequence according to the initial vector and an inverter modulation degree; on the basis of a current deadbeat prediction control principle, calculating action time of a basic vector in the standby sequence; and determining an optimal sequence and acting on the inverter by combining the selected sequence and the vector action time. The common-mode voltage amplitude of the inverter is effectively reduced, the current prediction process is simplified, the calculation amount is effectively reduced, and the control precision is also effectively improved.

Description

technical field [0001] The invention belongs to the field of AC motor control systems in the field of power electronics and electric transmission, and in particular relates to a model predictive pulse sequence control method of a permanent magnet synchronous motor with low torque ripple and common mode voltage. Background technique [0002] Permanent magnet synchronous motor has the advantages of small size, light weight and high power density, and has been widely used in various high-power AC transmission systems. At present, high-performance permanent magnet synchronous motor control technology mainly includes vector control and direct torque control. Vector control has been applied and promoted in the industry because of its good steady-state control performance. Its control performance depends on the inner loop PI controller, and the adjustment and tuning of PI parameters are more complicated. Direct torque control has the advantages of simple structure, fast dynamic re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P27/06H02P25/024
CPCH02P21/14H02P27/06H02P25/024H02P2207/05
Inventor 宋文胜李佳耀张树林李永新余彬葛兴来宋玉明
Owner SOUTHWEST JIAOTONG UNIV
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