The performance enhancement of a reverse osmosis (RO) unit through periodic control is studied by manipulating the feed pressure and the flow rate. To ensure the periodic behavior of the inputs, the manipulated variables (MV) are transformed into sinusoidal functions. In this case, the amplitude and the period of the sinusoidal functions become the surrogate MV and are regulated via nonlinear model predictive control algorithm. It was clear from the simulation results that the control system can generate cyclic inputs necessary to enhance the closed-loop performance by increasing the permeate production and lowering the salt concentration. The proposed control system can achieve its objective with arbitrary set point for the controlled outputs. It is important to note that reliable results were obtained even in the presence of modeling errors.
- Dynamic Systems and Control Division
On the Periodic Control of a Reverse Osmosis Desalination Unit
Ali, E. "On the Periodic Control of a Reverse Osmosis Desalination Unit." Proceedings of the ASME 2012 5th Annual Dynamic Systems and Control Conference joint with the JSME 2012 11th Motion and Vibration Conference. Volume 2: Legged Locomotion; Mechatronic Systems; Mechatronics; Mechatronics for Aquatic Environments; MEMS Control; Model Predictive Control; Modeling and Model-Based Control of Advanced IC Engines; Modeling and Simulation; Multi-Agent and Cooperative Systems; Musculoskeletal Dynamic Systems; Nano Systems; Nonlinear Systems; Nonlinear Systems and Control; Optimal Control; Pattern Recognition and Intelligent Systems; Power and Renewable Energy Systems; Powertrain Systems. Fort Lauderdale, Florida, USA. October 17–19, 2012. pp. 575-579. ASME. https://doi.org/10.1115/DSCC2012-MOVIC2012-8581
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