Nonlinear Model Predictive Control of a Distillation Column Using Wavenet Based Hammerstein Model

• Main Authors: K., Ramesh, Anwaruddin, Hisyam, N., Aziz, S. R., Abd Shukor
• Format: Article
• Language: English; English
• Published: International Association of Engineers 2012
• Subjects: QD Chemistry
• Online Access: http://umpir.ump.edu.my/id/eprint/6772/1/Nonlinear_model_predictive_control.pdf; http://umpir.ump.edu.my/id/eprint/6772/3/fkksa-2012-ramesh-Nonlinear%20Model%20Predictive%20Control%20of%20a%20Distillation.pdf; http://umpir.ump.edu.my/id/eprint/6772/; http://www.engineeringletters.com/issues_v20/issue_4/EL_20_4_04.pdf

Distillation columns are fairly complex multivariable systems and needs to be controlled close to optimum operating conditions because of economic incentives. Nonlinear Model Predictive Control (NMPC) scheme is one of the best options to be explored for proper control of distillation columns. In the present work, a new wavenet based Hammerstein model NMPC has been developed to control distillation column. An experimentally validated equilibrium model was used as plant model in nonlinear system identification and in NMPC. Two multiple-input-single-output (MISO) wavenet based Hammerstein models are developed to model the dynamics of the distillation column. The nonlinear model parameters were estimated using iterative prediction error minimization method. The Unscented Kalman Filter (UKF) was used to estimate the state variables in NMPC and the NLP problem was solved using sequential quadratic programming (SQP) method. The closed loop control studies have indicated that the performance of developed NMPC scheme was good in controlling the distillation column