Multiloop PI controller for achieving simultaneous time and frequency domain specifications

Most of the controllers in control system are designed to satisfy either time domain or frequency domain specifications. this work presents the computation of a multiloop pi controller for achieving time and frequency domain specifications simultaneously. the desired time and frequency domain measures are to be specified initially to the design. to obtain the desired value of the performance measures the graphical relationship between the pi controller and the performance criteria is given. thus by using graphical method a set of pi controller parameters to meet the desired performance measures are obtained in an effective and simpler way. the coupled tank has become a classic design of control engineering for multivariable process. the proposed control strategy has been implemented in the same coupled tank process and validated through simulation studies. © school of engineering,taylor’s university.