基于全转速范围内的直接转矩控制调速系统的研究

Research on Direct Torque Control Speed Adjustment System within Full-Speed Range

文章通过建立一种包含弱磁控制的直接转矩调速控制系统仿真模型,实现了感应电动机全转速范围内的速度控制,既可以实现同步转速以下的恒转矩调速,又可以实现弱磁范围内的恒功率调节。仿真结果显示系统的调速性能良好,在换向调速过程中,无抖动和超调现象,很好地实现了电动机调速的四象限特性,弱磁控制过程平稳。对研究全转速范围内直接转矩调速控制具有较好的参考价值。

A simulation system of direct torque control speed adjustment system is introduced,and it include field-weakening control.The simulation system realized induction-motor speed control within full-speed range,constant torque adjustment less than foundation speed and constant power adjustment greater than foundation speed.The results of simulation show that system performance is excellent.The ripple and overshoot of speed are reduced;the four-quadrant characteristic of induction-motor varying speed is achieved successfully;the field-weakening control is very smooth.The simulation model has better reference meaning for researching direct torque control system within full-speed range.