基于定子磁链矢量预测的DTC系统研究

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

针对直接转矩控制(DTC)技术中采用的传统滞环控制存在转矩及电流脉动大,过电压扇区时磁链轨迹畸变的缺点,提出一种基于定子磁链矢量预测的直接转矩控制方法。首先,根据磁链和转矩的偏差,预测出下一个控制周期的磁链矢量;然后,用预测磁链矢量减去当前的磁链矢量,得到需要加在电机定子上的电压矢量,以补偿当前的偏差。通过仿真说明了改进的系统抑制了磁链和转矩脉动,改善了电流波形,抑制了谐波,具有较好的动静态性能。

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.