Variable-Structure Position Control-A Class of Fast and Robust Controllers for Synchronous Reluctance Motor Drives
Keywords:
Variable structure. synchronous reluctance machine. position control. adaptive nonlinear control.
Abstract:
A family of variable structure robust position trackingcontroller is presented for a three-phase synchronous reluctancemotor (SynRM) considering the maximum torque control (MTC)strategy related to this motor. Neglecting the iron losses, theproposed controller is designed including one of the three classesof linear variable structure controller and adaptive input-outputfeedback linearization (AIOFL) approaches. Foremost, a slidingmode-plus-PI controller is used to obtain the stator currentreference signal. For that stage, three classes of a PI-slidingcontroller are presented. These methods are then compared and itscharacteristics are specified and the optimum use for any case,determined. The presented position controller is fast response androbust against mechanical parameter uncertainties and loadtorque disturbance. At Second stage, the proposed sliding modebased AIOFL controller estimates the unknown electricaluncertainties without using sign(. ) or sat(. ) function. Hence, itreduces chattering or steady state error phenomenon. Finally, theeffectiveness and feasibility of the proposed control approach isdemonstrated by computer simulation. The results obtainedconfirm that the desired position reference command is perfectlytracked in spite of motor parameter uncertainties and load torquedisturbance.