Research of DTC system based on the stator flux linkage vector prediction

For the traditional hysteretic control used in the direct torque control has two shortcomings,which are torque and current ripple and presence of flux trajectory when passing voltage sector,proposed direct torque control method based on the stator flux vector prediction.First,according to the deviation of magnetic linkage and torque,predicting the next flux vector control cycle;Then,using predict flux vector minus the current flux linkage vector,get stator voltage vector which need to add on the motor,to compensate the current deviation The simulation show that the improved system inhibits the flux and torque ripple,improves the current waveform,suppresses harmonic,and has a good dynamic and static performance.