MIQP-BASED MPC IN THE PRESENCE OF CONTROL VALVE STICTION

• Main Authors: H., Zabiri, Y., Samyudia
• Format: Conference or Workshop Item
• Published: 2008
• Subjects: TP Chemical technology
• Online Access: http://eprints.utp.edu.my/3701/1/111.pdf; http://search.informit.com.au/documentSummary;dn=588944676552216;res=IELENG>; http://eprints.utp.edu.my/3701/
• Institution: Universiti Teknologi Petronas

Stiction in control valve is the most common and long standing problem in process industry, resulting in oscillations in process variables which subsequently lower product quality and productivity. In this paper, we investigate the effect of avoiding the deadband region of stiction using Mixed-Integer Quadratic Programming (MIQP) based Model Predictive Controller (MPC). Different scenarios of control valve stiction are considered. Simulation studies using an industrial case study of fluid catalytic cracking unit (FCCU) show that, if the dead-band value is known a-priori, the MIQP-based MPC can effectively improve the closed-loop performance in the presence of stiction through the reduction of oscillations in the process variables.