MRAC and sliding motion control techniques to design a new robust controller for induction motor drives

A new robust controller is proposed for induction motor drives. This controller consists of two controllers, namely, the machine and the inverter controllers. The machine controller is split into three subcontrollers, the speed, the rotor flux and the stator current vector subcontrollers. This allows to obtain both robustness against variations of all motor and load parameters using robot control techniques, and to satisfy constraints on the stator current and supply voltage vectors of the motor. Both model reference adaptive control and nonconventional sliding motion control techniques are used. The inverter controller is designed so that a sliding motion takes place on the chosen surfaces, also minimizing the commutation number of the power switches of the inverter. Several tests carried out by simulation experiments show that the whole controller is very robust and suitable for position and speed control applications.<>