Self tuning vector control for induction motors

The authors present a control scheme for adaptively updating the gains in the control loop of a voltage inverter-fed induction motor drive. The method is essentially an implementation of a parallel adaptive model following control (AMFC) system. The reference model is obtained assuming perfect decoupling conditions. The method presented allows simple design and implementation of the AMFC system, and the desired closed-loop performance is achieved under variations of different plant parameters including the rotor resistance. Since the rotor dynamics is included in the model, it describes the transient performance of a closed-loop system. Results of numerical simulations of a self-tuning vector controller using the adaptive model reference techniques are presented. The controller gains are adjusted to accommodate changes in the rotor resistance. The nonzero steady-state error indicates that the PI gains need to be included in the adaptation loop