Simultaneous optimization and control for polypropylene grade transition with two-layer hierarchical structure

doi:10.1016/j.cjche.2015.08.025

Chin.J.Chem.Eng. ›› 2015, Vol. 23 ›› Issue (12): 2053-5064.DOI: 10.1016/j.cjche.2015.08.025

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Simultaneous optimization and control for polypropylene grade transition with two-layer hierarchical structure

Haichuan Lou^1,2, Hongye Su¹, Yong Gu¹, Lei Xie¹, Gang Rong¹, Weifeng Hou²

1 Laboratory of Industrial Control Technology, Institute of Cyber-Systems and Control, Zhejiang University, Hangzhou 310027, China;
2 Zhejiang Supcon Software Co., Ltd., Hangzhou 310053, China

Received:2015-05-25 Revised:2015-07-26 Online:2016-01-19 Published:2015-12-28
Contact: Hongye Su
Supported by:
Supported by the Electronic Information Industry Development Foundation of China (20140806) and the National Natural Science Foundation of China (61374121,61134007).

Simultaneous optimization and control for polypropylene grade transition with two-layer hierarchical structure

Haichuan Lou^1,2, Hongye Su¹, Yong Gu¹, Lei Xie¹, Gang Rong¹, Weifeng Hou²

1 Laboratory of Industrial Control Technology, Institute of Cyber-Systems and Control, Zhejiang University, Hangzhou 310027, China;
2 Zhejiang Supcon Software Co., Ltd., Hangzhou 310053, China

通讯作者: Hongye Su
基金资助:
Supported by the Electronic Information Industry Development Foundation of China (20140806) and the National Natural Science Foundation of China (61374121,61134007).

Abstract

Abstract: In this paper, a two-layer hierarchical structure of optimization and control for polypropylene grade transition was raised to overcome process uncertain disturbances that led to the large deviation between the open-loop reference trajectory and the actual process. In the upper layer, the variant time scale based control vector parametric methods (VTS-CVP) was used for dynamic optimization of transition reference trajectory, while nonlinear model predictive controller (NMPC) based on closed-loop subspace and piece-wise linear (SSARX-PWL) model in the lower layer was tracking to the reference trajectory from the upper layer for overcoming high-frequency disturbances. Besides, mechanism about trajectory deviation detection and optimal trajectory updating onlinewere introduced to ensure a smooth transition for the entire process. The proposed method was validated with the real data from an industrial double-loop propylene polymerization reaction process with developed dynamic mechanismmathematicalmodel.

Key words: Polypropylene, Grade transition, Two-layer hierarchical structure, Deviation detection

摘要： In this paper, a two-layer hierarchical structure of optimization and control for polypropylene grade transition was raised to overcome process uncertain disturbances that led to the large deviation between the open-loop reference trajectory and the actual process. In the upper layer, the variant time scale based control vector parametric methods (VTS-CVP) was used for dynamic optimization of transition reference trajectory, while nonlinear model predictive controller (NMPC) based on closed-loop subspace and piece-wise linear (SSARX-PWL) model in the lower layer was tracking to the reference trajectory from the upper layer for overcoming high-frequency disturbances. Besides, mechanism about trajectory deviation detection and optimal trajectory updating onlinewere introduced to ensure a smooth transition for the entire process. The proposed method was validated with the real data from an industrial double-loop propylene polymerization reaction process with developed dynamic mechanismmathematicalmodel.

关键词: Polypropylene, Grade transition, Two-layer hierarchical structure, Deviation detection

Haichuan Lou, Hongye Su, Yong Gu, Lei Xie, Gang Rong, Weifeng Hou. Simultaneous optimization and control for polypropylene grade transition with two-layer hierarchical structure[J]. Chin.J.Chem.Eng., 2015, 23(12): 2053-5064.

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Simultaneous optimization and control for polypropylene grade transition with two-layer hierarchical structure

Simultaneous optimization and control for polypropylene grade transition with two-layer hierarchical structure

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