PMSM direct torque control method based on simplified three-level SVPWM algorithm

The invention discloses a PMSM direct torque control method based on a simplified three-level SVPWM algorithm. The method comprises the following steps: (1) respectively converting a stator three-phase current signal and a stator three-phase voltage signal of a high-speed permanent magnet synchronous motor (9) to obtain a stator current signal and a stator voltage signal under a two-phase static DQ coordinate system; (2) calculating to obtain a feedback torque; the difference between the motor angular speed signal given by the control system and the actual angular speed signal of the motor passing through a rotating speed PI regulator to obtain a motor reference torque; (3) adding the load angle increment and the stator flux linkage vector phase angle in the step (2) to obtain a referencevoltage vector phase angle; and (4) obtaining 12 paths of PWM pulse signals to drive a three-level inverter (8) so as to accurately control the high-speed permanent magnet synchronous motor. Accordingto the simplified three-l