Optimal tuning of decentralized fractional order PID controllers for TITO process using equivalent transfer function

This paper presents a method of designing independent fractional order PI/PID controller for two interacting conical tank level (TICTL) process based on the Equivalent Transfer Function (ETF) model and simplified decoupler. The TICTL process is decomposed into independent single input single output (SISO) model using ETF. A bat optimization algorithm is utilized to independently design a diagonal fractional order PI/PID controller based on ETF model. The effectiveness of the proposed method is illustrated with simulation examples and also the experimental TICTL process utilized to validate the proposed method. (C) 2019 Published by Elsevier B.V.