Decentralized robust evolving cloud-based controller for two input two output systems

Abstract

The fuzzy logic controller (FLC) makes it possible to control a system using IF-THEN rules through human intellect. It tackles parameter uncertainty using imprecise reasoning. The fuzzy logic controller is usually tuned using offline methods. An online evolving adaptation of fuzzy controller design is a recent trend in fuzzy rule-based systems. The robust evolving cloud-based controller (RECCo) is one such controller implemented for single-input-single-output (SISO) systems. The membership functions and consequent rules are automatically updated in real time based on the input data. In this paper, a decentralized robust evolving cloud-based controller (DRECCo) is proposed for two-input-two-output (TITO) systems. It consists of two independent loops with RECCos having a nonparametric premise facet and an adaptive proportional-integral-derivative (PID) model consequent facet. The effectiveness of the proposed method is validated for the benchmark interacting two-tank process (ITTP) and quadruple-tank process (QTP) by simulation and in real time. The results indicate that with the information of loop pairing and the forward-acting/reverse-acting nature of the process, the proposed controller can adapt itself to ensure set-point tracking and disturbance rejection.

Disturbance rejection–based robust decentralized controller design for a multivariable system

“…Owing to these difficulties, controller design for an MIMO system is more difficult than a single-input single-output (SISO) system. Hence, over the past few decades, several control approaches have been proposed to overcome difficulties of MIMO process (Mahapatro and Subudhi, 2022; Vijay Anand and Manoharan, 2022). SISO proportional–integral–derivative (PID) controllers with decoupler are mostly considered because of their simplicity, easy implementation and robustness.…”