Design of FOPI controller for time delay system

In this paper fractional order controller for level process is designed. Based on experimental model of the process, the integer and fractional order controller tuning rules have been compared in order to minimize the integral absolute error (IAE) and integral time absolute error (ITAE) with a constraint on the maximum sensitivity. To check the robustness of the system for process model stability, the assessment is done using controller performance with achieved performance. The experimental results for level process are reported using fractional order internal model controller rules, designed for experimental model. Also obtained results are tested with simulated and experimental result. By comparing the results obtained for integer and fractional order controller, it is shown that fractional order internal model controller (FO-IMC) gives better result as compared to other tuning method for an obtained process model. The results are obtained for fractional order proportional integral internal model controller (FOPI-IMC) on the bases of performance parameter and performance criteria.