Direct Torque Control Method for Doubly Salient Permanent Magnet Synchronous Motor Based on Model Prediction

Abstract

The invention discloses a model prediction-based doubly salient permanent magnet synchronous motor direct torque control method. The model prediction-based doubly salient permanent magnet synchronous motor direct torque control method comprises the following steps that: stator current and rotor angular speed of a doubly salient permanent magnet synchronous motor are acquired; under eight groups of inverter switching vector signals, and based on the stator current and the rotor angular speed, the output current of the motor at a next moment of each kind of inverter switching vector is predicted according to constraint relationships between current variation quantity, micro components and voltage, current under eight kinds of switching states; based on a direct torque control theory, motor torque and motor magnetic flux linkage at the next moment of each kind of inverter switching vector can be further predicted; and related voltage vectors are selected reasonably with realizing minimum total quantity of the torque and the magnetic flux linkage adopted as a target, and therefore, the operation of an inverter can be controlled real time. With the model prediction-based doubly salient permanent magnet synchronous motor direct torque control method of the invention adopted, switching frequency and loss can be effectively decreased, and torque fluctuation of the motor can be decreased.

Description

technical field [0001] The invention relates to the technical field of doubly salient permanent magnet synchronous motors, in particular to a method for direct torque control of doubly salient permanent magnet synchronous motors based on model prediction. Background technique [0002] As early as the 1950s, the concept of DoublySalientPermanentMagnetSynchronousMachine (DSPM) was proposed by Rauch and Johnson. However, due to the limitation of the magnetic properties of permanent magnet materials (AlNiCo), DSPM is relatively electric excitation synchronous motor. In other words, it has a large volume, low power factor and low efficiency, so its development speed has been relatively lagging behind for a long time. With the emergence of the third-generation rare-earth permanent magnet material NdFeB (NdFeB), the development of DSPM motors has been further developed. [0003] With the advancement of related technologies, the research on DSPM continues to deepen, and DSPMs with ...

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Problems solved by technology

[0005] The present invention proposes a torque control method for doubly salient pole permanent magnet synchronous motor based on model prediction, the purpose of which is to effectively reduce the switching frequency of the inverter, reduce the torque fluctuation of DSPM, and solve the problem of traditional direct torque control strategy Large control error, variable switching frequency of the inverter (sometimes very high), large fluctuations in motor output torque

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