Design of current controller in an AC drive using a state stimulator concept

In the paper a new design method for finding the structure of the current controllers in electric drive on the example of an AC drive with induction motor is proposed. This method uses the approach based on the theory of dual-observers, proposed some years ago by D. G. Luenberger for improving the dynamic transients in the autonomous systems with the feedback loop. This approach was extended by one of the authors to the non-autonomous systems with external control. The modified dual-observer, being a special kind of state compensator, was called a “state stimulator”. The method, described in this paper for indirectly controlled induction motor, can be used for design of current control loops in other kinds of electric drives as well.