A Nonlinear Predictive Control for Optimal Grade Transition of Polymerization Reactors

Wang, Y.; Ohshima, Masahiro; Seki, Hiroya; Ooyama, Satoshi; Akamatsu, K.; Ogawa, Morimasa

doi:10.1016/s1474-6670(17)38621-4

Cited by 11 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optimal grade transition control system consists of an offline optimizer and a nonlinear GMC‐based controller. The basic idea of the strategy is as follows 24. The optimal open‐loop policies for hydrogen and catalyst feed rates are calculated offline.…”

Section: Control Algorithmmentioning

confidence: 99%

Optimal grade transition control for liquid‐propylene polymerization reactor

Ali

2010

Asian Journal of Control

View full text Add to dashboard Cite

A nonlinear control system integrating an off-line optimizer and a nonlinear model-based controller is developed to perform optimal grade transition operations in a continuous pilot plant reactor. A simple black-box model is developed and used to determine optimal trajectories of inputs and outputs for a series of three polypropylene grades. The simplified model is also used to develop a nonlinear controller. This controller is similar to generic model control; however, the integral action is omitted and an on-line updating scheme is incorporated to update pre-specified model parameters using delayed process measurements. The time optimal inputs, which are calculated by the off-line optimizer, are introduced to the plant in a feedforward manner. At the same time, the deviations from the optimal output are corrected using the feedback nonlinear controller. The simulations on a complex mechanistic model of the process reveal that the nonlinear control scheme performs well for both set point tracking and disturbance rejection. This paper integrates well-known methodologies, such as the generic-model control algorithm, parameter update schemes, and off-line optimization, together to develop an applicable and robust control technique for continuous polymerization reactors.

show abstract

Section: Control Algorithmmentioning

confidence: 99%

Optimal grade transition control for liquid‐propylene polymerization reactor

Ali

2010

Asian Journal of Control

View full text Add to dashboard Cite

show abstract

“…The manipulated variable profile was determined using the control‐vector parameterization method. Wang et al (Wang et al, 2000a, b) approached the problem of optimal control of an industrial slurry polyethylene reactor. The solution technique used for this study is similar to that of Takeda.…”

Section: Introductionmentioning

confidence: 99%