Nonlinear Control of pH System for Change Over Titration Curve

Chemical and biochemical engineering quarterly

R. Pickhardt¹  M. Chidambaram¹  D. Swati¹  V. S. R. Rao¹ 

关键词: pH;    Wiener model;    nonlinear cascade structure;    strong acid;    weak acid;   

DOI  :  

来源: Croatian Society of Chemical Engineers

【 摘 要 】

Abstract Wiener model based nonlinear controller for a pH process efficiently tackles the variations in gain. However, the controller performance deteriorates for significant change over titration curve (i.e. when the nature of the feed stream switches from a weak acid to a strong acid). To improve the performance of this controller, a nonlinear cascade controller is proposed. The nonlinear cascade structure consists of a Wiener model based nonlinear P controller in the inner loop and a linear PI controller in the outer loop. The proposed strategy is simulated for switch over titration curve from a weak acid – strong base system to strong acid – strong base system and then back to the weak acid – strong base system. The performance of the nonlinear cascade controller is compared with that of single loop Wiener model based PI controller and linear cascade (P-PI) controller.

【 授权许可】

Unknown