Dissolved oxygen control in wastewater treatment based on robust PID controller
by Xue-ling Song; Ying-bao Zhao; Zhe-ying Song; Chao-ying Liu
International Journal of Modelling, Identification and Control (IJMIC), Vol. 15, No. 4, 2012

Abstract: The dissolved oxygen (DO) concentration is an important parameter in wastewater treatment process. It must be kept within a particular range when the unit plant is running. Considering the characteristics of the time-delay, inertia and time-varying of DO, the paper introduces a new type of robust PID controller that can assure stability when parameter and time delay are mismatched with the controller. Simulation result shows that this control strategy has good robustness and effectiveness in model mismatching situation, and provides an effective way to solve the control difficulty problem of DO.

Online publication date: Sat, 29-Nov-2014

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