Absfracf-An attempt has becR made in the ~w R t wotk to improve the dynamic and steady state performances of the vector controlled induction motor (IM) drives. Input-output linearization and decoupling technique based on the concepts of differential geometry, hru been used to decouple the speed, or torque from nux. Optimal p r o p o r t i d -m t e g d (P-I) controllers in flux and speed loops are designed to obtain desired dynamic and steady state responses. A new rotor nux observer has been designed to estimate the nux at all speeds. Simulation results show that the performance of the drive system with the designed controller is comparable to that with vector controller and the proposed drive system is more flexible.
The design, implementation and performance of a multivariable optimal state feedback controller for a Current Source Inverter-fed Induction Motor (CSI-IM) drive using a new reduced order observer to estimate rotor currents have been reported in this paper. A quadratic performance index together with a set of prescribed closed loop eigenvalues for placement are considered for application to a d-q axes state space linearized model of the drive to derive the control law -for achieving prescribed degree of stability in contrast to an earlier design with only pole-placement. The optimal control law derived is a function of all the states, the inaccessible states like d-q axes rotor currents being estimated by a new observer whose structure is simpler than that of one used in an earlier case. The controller-observer is implemented using an inexpensive microprocessor kit and the experimental results are presented along with the digital simulation results for the controlled drive to show its performance under step changes of load torque and references.
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