Improving the Performance on the Chemical Oxygen Demand Regulation in Anaerobic Digestion

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• 作者：Hugo O. M&eacute ; ndez-Acosta ; Ricardo Femat ; and Daniel U. Campos-Delgado
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2004
• 出版时间：January 7, 2004
• 年：2004
• 卷：43
• 期：1
• 页码：95 - 104
• 全文大小：191K
• 年卷期：v.43,no.1(January 7, 2004)
• ISSN：1520-5045

文摘

A dynamical output feedback control for the regulation of the chemical oxygen demand (COD)in anaerobic digestion is discussed in this paper. The control law can have different structures:(i) nonlinear if a nominal value of the influent COD concentration is available, and (ii) linear ifsuch a nominal value is not available. The control law includes a high-gain observer used asthe dynamic estimator, which allows one to achieve the COD regulation despite modeling errors(which are mainly related to the kinetic terms). However, the dynamic estimator can induceundesired effects such as the so-called peaking phenomena. Such a phenomenon produces largeovershoots on the control input and leads to windup behavior as a result of constraints on thecontrol input. To improve the performance, two schemes are proposed: (a) an antiwindup schemeto consider the constraints in the control input and (b) a fuzzy-based gain-scheduling scheme totune online the control parameters. Both schemes are designed for the nonlinear and linearstructures of the controller. The performances of the proposed schemes are compared by meansof a performance index via numerical simulations.