Model prediction control method for reducing torque ripple and flux linkage fluctuation of PMSM

Abstract

The invention provides a model prediction control method for reducing torque ripple and flux linkage fluctuation of a PMSM (permanent magnet synchronous motor). According to the method, the algorithm complexity is reduced by adopting a fast selection table, and the flux linkage fluctuation is comprehensively considered while the torque performance is ensured. The method comprises the following steps: firstly, carrying out comprehensive analysis on an electromagnetic torque slope and a stator flux linkage slope, and carrying out sector judgment according to predicted values; secondly, effective voltage vector selection is carried out in a fast selection table according to the torque difference value and the number of sectors, and the selection time of the effective voltage vector is shortened; and finally, the action time of each voltage vector is calculated according to a dead-beat control principle. In the whole control process, a small number of prediction times is adopted, the system structure is simplified, the small calculation amount of the algorithm in the operation process is guaranteed, the control precision of the system is improved, the complexity of the system is reduced, and it is guaranteed that the permanent magnet synchronous motor has wide commercial application value in the control field.

Description

technical field [0001] The invention belongs to the field of permanent magnet synchronous motor control, and relates to a direct torque control method for model prediction, which is specifically used for a surface-mounted permanent magnet synchronous motor, which can be controlled to run stably, and is mainly used for reducing the speed of the motor during operation. Torque ripple, flux fluctuation and reduce its current harmonic content. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) is widely used because of its simple structure, small size, high efficiency and high power density, especially in daily life, such as electric vehicles, electric buses, unmanned vehicles, etc. In addition, it is also very common in the military industry, such as tanks, artillery shells and other military weapons. Therefore, in order to better exert the performance of the motor, save the control cost, and control the stable operation of the motor, the introduction of th...

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Problems solved by technology

[0004] The invention aims to solve the problem of large torque ripple and large current ripple during the operation of the motor due to the disturbance of the balance due to the application of external force during the operation of the motor, as well as the problem of large amount of calculation and high complexity in the algorithm

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