Abstract
This paper proposes a new analytical method for the design of decentralized Proportional-Integral (PI) controller for coupled tank process. The proposed design methodology aims to achieve the minimum interaction among the loops for Multi-Input Multi-Output (MIMO) process of first order with time delay. The decentralized controller is designed in terms of equivalent transfer function results from the pairing of MIMO process using Relative Normalized Gain Array (RNGA). The effectiveness of the proposed controller is established through simulation and real time studies. The results demonstrate that the proposed design of decentralized controller gives less interaction response coupled with good robustness.
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