Abstract:To solve the problem that the traditional model predictive control has poor prediction accuracy, and the frequency is not fixed, which leads to high current harmonic content in three-phase inverter, this paper proposes a two vector modulation model predictive control of three-phase inverter based on Improved Euler method, which can significantly reduce the output current harmonic of three-phase inverter. Firstly, the improved Euler method is used to replace the traditional Euler method to improve the prediction accuracy of the discrete model. Secondly, the fixed switching frequency and high-precision control are realized by using the method of dual voltage vector synthesis modulation. Finally, a three-phase inverter simulation model is built based on Matlab/Simulink to verify the proposed control strategy and compared with other methods. The results show that compared with the traditional Euler method and the fourth-order Runge Kutta method, the proposed method has significant advantages in the steady-state and dynamic response, and the harmonic distortion rate of output current is as low as 0.98%, which is also superior to the response effect of disturbance.