ABSTRACT

A computer based method to reduce the complexity of the higher order controller, based on the minimization of integral square error (ISE) and Dominant Pole Retention method pertaining to unit step input is presented in this paper. In this order-reduction technique, dominant pole of the higher order plant is retained and reduced order model of the plant is obtained using ISE Minimization Technique. Using this reduced order plant a reduced order controller is obtained. The method has built in stability – preserving feature.