IMC based Fractional Order Controller for Non-Minimum phase system

In this paper, an attempt has been made to design Internal Model Control (IMC) based Fractional Order Controller for Non-Minimum phase system using constrained minimization optimization technique. The IMC scheme has some advantage over classical feedback control structure. Implementing IMC, one can very clearly analyze the effect of process characteristics such as time delays and Right Hand Plane (RHP) zeros on overall controllability of the process. Also IMC is much easier to tune as compared to the controller involved in the standard feedback control structure. Moving a step further, an effort has been made in the present work to enhance the flexibility of the above discussed IMC by introducing the non-integer order filter. Moreover to show the greatness of IMC based fractional order controller over integer order IMC controller, a comparative study has been made. Also for better disturbance rejection, various schemes of filter design have been proposed which includes both direct mathematical approach as well as optimization technique approach.