Simplified design of I-P controller for speed control of two-inertia system

In this paper, a simplified design of I-P controller for a higher-order plant by using the concept of plant model reduction mid the CRA method with less number of characteristic ratios alpha_i is presented. The Pade type approximation method is used to obtain a lower-order plant model of the higher-order plant first. Then an I-P controller is designed for the model by using CRA method with the appropriate values of characteristic ratios in order to obtain the closed-loop step response without overshoot. Finally, the designed I-P controller is employed to control the original higher-order plant. The sufficient performance of the speed control of a two-inertia system employing the I-P controller designed from its lower-order plant model is shown by the simulation results. The simulation results of the speed control in term of varying the value of a factor beta greater than one in the design, tracking the motor speed, and rejecting the disturbance effect are also investigated.