Direct torque control based on space vector modulation

In view of problems of big ripple of torque and flux linkage of traditional direct torque control,the paper proposed a control strategy of direct torque control based on space vector modulation.The control strategy uses flux and torque PI controller to instead of hysteresis comparator of traditional direct torque control system,and adopts space vector pulse width modulation to instead of voltage vector switch to synthetic voltage vector which can compensate for flux error and torque error to avoid hysteresis ripple.The Matlab/Simulink simulation result shows that the flux truck of control system of motor based on space vector pulse width modulation is more closed to round,and its torque and flux and current ripple is smaller compared with the traditional direct torque control system.