Model Predictive Direct Torque Control of PMSM Considering Switching Frequency Optimization

Switching frequency is very important to the control of the inverter as well as driving motor system. This paper presents a design method of model predictive direct torque controller for permanent magnet synchronous motor considering switching frequency optimization. Firstly, the mathematical models of PMSM and inverter and their integrated models in discrete time are constructed. Secondly, the principle of the model predictive control method and its application in direct torque control are described, and the controller design is carried out using its integrated model. When constructing the cost function, the optimal switching frequency of the inverter is used as a condition to further limit it. Finally, the simulation models of the proposed method and the traditional direct torque control method are established to verify their superiority.