Analysis and Development of New PID Controller Tuning Rules For First-Order Processes

Abstract

Abstract This paper provides the complete analysis of cascade PID controller for first-order processes. Plants with and without time delay are separately analyzed. The analysis proves the optimum selection for the plants without time delay is a PI controller with zero derivative action. New relationships are established to estimate the closed-loop ultimate gain and ultimate period for the plants with time delay. The novel PID tuning rules have been established for plants with time delay. The new criteria has the ability to select optimum gain parameters and avoid the integral windup problem. The selection of PI and PID controllers for those plants is also defined based on the actuator saturation. Simulation results revealed better performance of the proposed tuning rules compared to other commonly available tuning rules.