Pulse sequence predictive control of permanent magnet synchronous motor powered by three-phase four-switch inverter

In view of problems of less control degree of freedom and large ripple of current and torque in single vector predictive control method, a pulse sequence predictive control method of permanent magnet synchronous motor powered by three-phase four-switch inverter was proposed. Two kinds of symmetrical pulse sequences with three voltage space vectors are constructed, and the optimal pulse sequence is selected by using cost function of current reference value tracking. Calculation formula of duty cycle under current reference value tracking target is given, and the duty cycle is compensated by adjusting DC component to achieve DC bus capacitor voltage balance. The simulation results show that the method can track current reference value and balance bus capacitor voltage, which effectively reduces current ripple and torque ripple.