Simple PID Controller Design for Non-minimum Phase FOPTD and SOPTD Processes

A new analytical technique is proposed for the design of the PID controller for non-minimum phase stable first-order plus time delay (FOPTD) and second-order plus time delay (SOPTD) processes. The method is based on keeping the open-loop transfer function same as that required for a non-minimum phase integrating plus time delay transfer function model. Simulation case studies are carried out on different non-minimum phase stable FOPTD/SOPTD processes. The performance of the control system is compared with the recent methods. The present method enhances the servo and regulatory performances compared to the recent methods.