Multivariable model predictive control (4x4) of methanol-water separation in dimethyl ether production

Abdul Wahid, Zaki Haryo Brillianto

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The use of the Model Predictive Control (MPC) controller in DME production from synthesis gas has shown better results than the Proportional-Integral (PI) controller. However, this SISO MPC controller makes the DME production process uneconomical due to the cost of expensive MPC controllers. In this study, a Multivariable Model Predictive Control (MMPC 4x4) controller was designed with four manipulated variables (MV) and four controlled variables (CV). MMPC controllers are proposed to reduce the number of controllers used and overcome inter-variable interactions that affect control performance. The design of the controller includes the identification of inter-variable interactions through first-order plus dead time (FOPDT) empirical modeling and controller adjustments. The four CV's include condenser temperature, output cooler temperature, condenser liquid level, and column liquid level, while the four MV's include condenser duty, cooler duty, distillate product flow rate, and bottom product flow rate. The results show that the interactions between the variables identified include all variables involved, so that a 4x4 matrix containing 16 FOPDT models is obtained. The control parameter values in the form of sampling time (T), prediction horizon (P), and control horizon (M) with optimum control performance are 2, 24, and 10. MMPC control performance is better than MPC, which is shown by IAE decline was 19.92% to 72.86% and ISE reduction was 19.16% to 83.58%.

Original languageEnglish
Title of host publication4th International Tropical Renewable Energy Conference, i-TREC 2019
EditorsEny Kusrini, I. Gde Dharma Nugraha
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735420144
DOIs
Publication statusPublished - 3 Sep 2020
Event4th International Tropical Renewable Energy Conference 2019, i-TREC 2019 - Bali, Indonesia
Duration: 14 Aug 201916 Aug 2019

Publication series

NameAIP Conference Proceedings
Volume2255
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference4th International Tropical Renewable Energy Conference 2019, i-TREC 2019
CountryIndonesia
CityBali
Period14/08/1916/08/19

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