一种感应电机直接转矩控制系统性能改善方案

该文首先从理论上对数字化控制感应电机传动系统的性能进行了推导，对电机转矩的变化量进行了详细的分析。然后结合直接转矩控制的原理，提出了一种新型的控制方案。从仿真结果可以看出：不仅系统的动态响应依然很快，而且可以有效地改善稳态转矩脉动较大的情况：同时由于采用了空间电压矢量调制，稳定了逆变器的开关频率。

AN IMPROVED SCHEME OF THE DIRECT TORQUE CONTROL SYSTEM OF INDUCTION MOTOR

Based on the theoretic analysis of performance of the induction motor (IM), the increment of electromagnetic torque of IM is analyzed in detail. Then one new contro strategy of IM is proposed on the basis of classical direct torque control (DTC). On one hand, the new control system still has rapid dynamic response while the electromagnetic torque ripple of the IM is greatly decreased. On the other hand, the switching frequency of the inverter is fixed based on the application of the space vector PWM (SVPWM).