Abstract
AbstractThis paper proposes a control strategy to stabilize a reverse osmosis desalination system against hydraulic shocks with enhancing productivity and sustainability. First, the effects of hydraulic transients on water quality have been reviewed. The transient waves are approximated by sinusoidal functions so that their effects are incorporated into the controlled system as external disturbances. Next, the active control is implemented based on the adaptive super-twisting (STW) sliding mode control (SMC) algorithms. Then, the robust performance is guaranteed whenever the sliding variables reach the sliding surfaces in finite time despite disturbances. The STW SMC scheme is to eliminate the chattering problems for protecting the valves and to improve the convergence precision for water production. The control gains are adaptable to enable formation of an effective controller for dealing with large disturbances such as water hammer during desalination process. The simulation results reveal the superior performances on controlling water product, while eliminating shock waves. Especially, the effect of hydraulic shocks has been dramatically attenuated, hence the plant components are protected to avoid fracture. Finally, the robust stability and performance of the desalination plants are guaranteed against large disturbances to ensure the population with quality water as well as system sustainability.
Highlights
Water desalination is the process of removing dissolved salts and mineral components from target substances in order to attain quality water for animal consumption, irrigation, and human use
The hydraulic transient studies with water hammering should be included in the design stage for reverse osmosis (RO) plants
The adaptive STW sliding mode control (SMC) controller has been successfully designed for the RO desalination system with the selected control parameters as follows: ε1,2 1⁄4 1, γ1,2 1⁄4 1, λ1,2 1⁄4 1,ω1 1⁄4 6, and ω2 1⁄4 8:5
Summary
Water desalination is the process of removing dissolved salts and mineral components from target substances in order to attain quality water for animal consumption, irrigation, and human use. Desalinated water is the main water source for meeting the water demands in water-scarce regions. Most of the modern interests in desalination have focused on developing effective ways of providing fresh water for human consumption in regions where the availability of fresh water is extremely limited. Desalination plants have been designed to consistently. Phuc et al | Active suppression of hydraulic transient for desalination plant
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