This paper presents two-degree-of-freedom (2-DOF) robust loop-shaping control methodology to stabilize a reverse osmosis (RO) desalination system operating under significant uncertainties, external disturbances and measurement noises, and to reduce product water cost. This method has the advantages that no information about the plant uncertainty is required and it can deal with external disturbance and noise simultaneously. The controlled RO plant is a multi-input multi-output (MIMO) system. The two controlled variables are product water flow and product water salinity, which are fundamental in water desalination. The result shows that the achieved controller has very good performance which can deal with up to 52% uncertainty, and eliminate 60% of disturbance and 70% of noise, while common existing controllers in RO desalination can't cover the uncertainty and disturbance or can only deal with small values of these factors. Now that the software and hardware in the RO plant are sufficiently robust, it is possible to use this powerful method for better water quality control of RO systems.
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Research Article|
September 16 2015
Robust water quality controller for a reverse osmosis desalination system Available to Purchase
Bui Duc Hong Phuc;
Bui Duc Hong Phuc
1Department of Convergence Study on Ocean Science and Technology, Korea Maritime and Ocean University, Busan 606-791, South Korea
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Sam-Sang You;
2Division of Mechanical Engineering, Korea Maritime and Ocean University, Busan 606-791, South Korea
E-mail: [email protected]
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Tae-Woo Lim;
Tae-Woo Lim
3Division of Marine Engineering, Korea Maritime and Ocean University, Busan 606-791, South Korea
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Hwan-Seong Kim
Hwan-Seong Kim
4Department of Logistics, Korea Maritime and Ocean University, Busan 606-791, South Korea
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Water Supply (2016) 16 (2): 324–332.
Article history
Received:
June 17 2015
Accepted:
September 04 2015
Citation
Bui Duc Hong Phuc, Sam-Sang You, Tae-Woo Lim, Hwan-Seong Kim; Robust water quality controller for a reverse osmosis desalination system. Water Supply 1 April 2016; 16 (2): 324–332. doi: https://doi.org/10.2166/ws.2015.141
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