RETRACTED ARTICLE: Decentralised fractional order pi decontroller tuned using grey wolf optimization for three interacting cylindrical tanks

Abstract

Interacting processes are available in Industries. Control of such interacting processes is a challenging problem. Various control schemes like multiloop control, decentralised control with decoupler and centralised control are available for interacting processes. Multiloop decentralised control is the simplest among all the control because of its simplicity and easy adaptation. Decentralised control involves splitting of MIMO systems into n number of SISO systems and design of controller for the SISO system. But the interaction effects cannot be eliminated and involves decoupler to nullify the interaction effects in traditional approach. Online tuning of the optimal parameters is done by putting the process under servo regulatory condition and by varying the set point of tanks simultaneously leading to a controller which avoids decoupler. In this article, the servo and regulatory conditions for the system is analysed by using fractional order PI controller. Performance shows that for MIMO process the proposed FOPI controller is best suited for control applications.