Izvorni znanstveni članak
Nonlinear Control of pH System for Change Over Titration Curve
D. Swati
V.S.R . Rao
R. Pickhardt
M. Chidambaram
Sažetak
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.
Ključne riječi
pH; Wiener model; nonlinear cascade structure; strong acid; weak acid
Hrčak ID:
3629
URI
Datum izdavanja:
20.12.2005.
Posjeta: 1.313 *