Fractional order PID optimal control in pH neutralization process

Abstract

This paper proposed an optimal control scheme for pH neutralization process based on fractional order PID (FOPID) controller. In order to enhance the stability of the outlet-pH as well as minimize the consumption of chemicals, the design of the controller is transformed into a discrete nonconvex optimization problem and solved by the state transition algorithm. Furthermore, a comparative study between the fractional order PID and PID controllers is carried out. And considering the practical application, the disturbance from the inlet-flow-rate change and inlet-pH change was also investigated. The simulation results demonstrate the superiority of the proposed strategy.