title: A novel double loop control model design for chemical unstable processes.
abstract: In this manuscript, based on Smith predictor control scheme for unstable process in industry, an improved double loop control model is proposed for chemical unstable processes. Inner loop is to stabilize integrating the unstable process and transform the original process to first-order plus pure dead-time dynamic stable process. Outer loop is to enhance the performance of set point response. Disturbance controller is designed to enhance the performance of disturbance response. The improved control system is simple with exact physical meaning. The characteristic equation is easy to realize stabilization. Three controllers are separately design in the improved scheme. It is easy to design each controller and good control performance for the respective closed-loop transfer function separately. The robust stability of the proposed control scheme is analyzed. Finally, case studies illustrate that the improved method can give better system performance than existing design methods.
authors.affiliation: Key Laboratory of Pressure Systems and Safety, MOE, East China University of Science and Technology, Shanghai 200237, China; Petro-China Jilin Petrochemical Company, Jilin 132021, China.
authors.forename: Er-Ding
authors.initials: ED
authors.lastname: Cong
authors.affiliation: Key Laboratory of Pressure Systems and Safety, MOE, East China University of Science and Technology, Shanghai 200237, China. Electronic address: agile_hu@ecust.edu.cn.
authors.forename: Ming-Hui
authors.initials: MH
authors.lastname: Hu
authors.affiliation: Key Laboratory of Pressure Systems and Safety, MOE, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Shan-Tung
authors.initials: ST
authors.lastname: Tu
authors.affiliation: Key Laboratory of Pressure Systems and Safety, MOE, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Fu-Zhen
authors.initials: FZ
authors.lastname: Xuan
authors.affiliation: School of Electrionic, Information & Electrical Engineering, Shanghai Jiaotong University, Shanghai 200240, China.
authors.forename: Hui-He
authors.initials: HH
authors.lastname: Shao
keywords: Chemical unstable processes; Computer simulation; Model design; Process control; Stability