Robust two-degree-of-freedom control for AC speed regulating system

According to sliding mode variable structure control and two-degree-of-freedom control, a speed controller for induction motor is introduced. The expected set point following characteristic is obtained by reference model and feed forward controller; the effect of parameter variation and the disturbance on the system is rejected by the strong robustness of sliding mode variable structure, so good disturbance rejection characteristic and robust stability of the system can be achieved. The simulation and experiment results show good performance.