|Juwari Purwo Sutikno||Chemical Engineering Department, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia|
|Zahrotul Azizah||Chemical Engineering Department, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia|
|Renanto Handogo||Chemical Engineering Department, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia|
|Riza Aris Hikmadiyar|
|Anwaruddin Hisyam||2Faculty of Chemical and Natural Recourses Engineering, Universiti Malaysia Pahang, 26300 Gambang, Kuantan, Malaysia|
In general, the multiple-input-multiple-output (MIMO) system is the main method of process control in industry. However, the interaction between variables in the process is a challenge when designing controllers for the system. Strong interaction worsens system performance. Inverted decoupling plays an important role in reducing interaction in the process. Internal model control (IMC) is the controller used in this research. A one degree of freedom (1DoF) IMC controller is only able to provide a good response to set-point tracking, and has a slow response to disturbance rejection. Therefore, a controller that has a good response to set-point tracking and disturbance rejection is a two degrees of freedom (2DoF) IMC. The tuning method uses maximum peak gain margin (Mp-GM) stability criteria based on the uncertainty model. In this study, a reduction in interaction was realized by the addition of inverted decoupling to the 2DoF IMC control scheme. The Wardle & Wood and Wood & Berry column distillation models are given as illustrative examples to demonstrate the performance of the inverted decoupling 2DoF IMC control scheme. A comparison is made of the IAE values of 1DoF IMC, 2DoF IMC, decoupling 2DoF IMC, and inverted decoupling 2DoF IMC, with inverted decoupling 2DoF IMC showing the lowest IAE value.
Interaction; Inverted decoupling; MIMO system; Mp-GM tuning; 2DoF IMC
In this study, the system used was MIMO 2×2 with Mp-GM tuning. Four controllers were used to compare the results, namely 1DoF IMC, 2DoF IMC, decoupling 2DoF IMC, and inverted decoupling 2DoF IMC. The results show that inverted decoupling produces the lowest IAE value compared to the other controllers. This structure is able to reduce the interaction between variables in the MIMO 2×2 process.
Thanks to the Institut Teknologi Sepuluh Nopember (ITS) through its Fresh Graduate Scholarship Program, LPPM ITS, Chemical Engineering Department FTI-ITS, and Process Design and Control Laboratory Chemical Engineering ITS.
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