Optimization of a fed-batch bioreactor for 1,3-propanediol production using hybrid nonlinearoptimal control
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A nonlinear hybrid system was proposed to describe the fed-batch bioconversion of glycerol to 1,3-propanediol with substrate open loop inputs and pH logic control in previous work . The current work concerns the optimal control of this fed-batch process. We slightly modify the hybrid system to provide a more convenient mathematical description for the optimal control of the fed-batch culture. Taking the feeding instants and the terminal time as decision variables, we formulate an optimal control model with the productivity of 1,3-propanediol as the performance index. Inequality path constraints involved in the optimal control problem are transformed into a group of end-point constraints by introducing an auxiliary hybrid system. The original optimal control problem is associated with a family of approximation problems. The gradients of the cost functional and the end-point constraint functions are derived from the parametric sensitivity system. On this basis, we construct a gradient-based algorithm to solve the approximation problems. Numerical results show that the productivity of 1,3-propanediol can be increased considerably by employing our optimal control policy.
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Optimization of a fed-batch bioreactor for 1,3-propanediol production using hybrid nonlinear optimal controlYe, J.; Xu, Honglei; Feng, E.; Xiu, Z. (2014)A nonlinear hybrid system was proposed to describe the fed-batch bioconversion of glycerol to 1,3-propanediol with substrate open loop inputs and pH logic control in previous work . The current work concerns the optimal ...
Robust multi-objective optimal switching control arising in 1,3-propanediol microbial fed-batch processLiu, Chongyang; Gong, Z.; Teo, Kok Lay; Sun, Jie; Caccetta, Louis (2017)© 2017 Elsevier Ltd This paper considers optimal control of glycerol producing 1,3-propanediol (1,3-PD) via microbial fed-batch fermentation. The fed-batch process is formulated as a nonlinear switched time-delay system. ...
Optimal 1,3-propanediol production: Exploring the trade-off between process yield and feeding rate variationWang, L.; Lin, Qun; Loxton, Ryan; Teo, Kok Lay; Cheng, G. (2015)This paper proposes a new optimal control model for the production of 1,3-propanediol (1,3-PD) viamicrobial fed-batch fermentation. The proposed model is governed by a nonlinear multi stage dynamic system with two modes: ...