FAULT-TOLERANT CONTROL OF A REVERSE OSMOSIS DESALINATION PROCESS

Abstract Fault-detection and isolation and fault-tolerant control structures are implemented on a reverse osmosis desalination plant. A detailed mathematical model of a simple reverse osmosis plant is first developed. A family of control configurations are identified next, and bounded nonlinear feedback controllers are developed for each configuration. Stability regions of the closed-loop system under each controller are explicitly characterized. A fault-detection and isolation filter is developed for the reverse osmosis system. A supervisory switching law is derived to guarantee closed-loop stability by determining the activation time of fall-back control configurations in the presence of faults in the primary control configuration. The proposed fault-tolerant control scheme is demonstrated in the context of a reverse osmosis system simulation.

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