Abstract
The robust regulatory controller for the highly nonlinear pH process is synthesized using the non-linear equivalent disturbance attenuation (NLEDA) technique of quantitative feedback theory (QFT). In the considered pH process, a strong acid flows into the constant volume well mixed tank and is thoroughly mixed with the strong base whose flow rate is manipulated to neutralize the outlet from the tank. The controller is designed to regulate the pH of the outlet stream within (7.0/spl plusmn/0.2) in the presence of significant parameter uncertainties and load disturbances. The robust stability of the control system is guaranteed by the QFT design procedure. The robust performance of the proposed controller is evaluated by rigorous simulation studies with the help of the nonlinear process model. The effects of sensor noise and random disturbances on the controller performance are also studied. The results are found to be very good.
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