Novel feedforward‐feedback‐based continuous process transition strategy for chemical industry

As a typical regulation means to realize a large‐scale transition of the system condition, the lack of feedback compensation in the transition strategy leads to the fact that it has no moderating effect on interference. In order to ensure the safe and smooth operation of the system, it is necessary to coordinate the transition and control, that is, to achieve the process transition through a closed‐loop control structure. The existing coordination scheme can meet this demand, but there is a defect of poor anti‐interference. To this end, a novel coordination scheme integrating transition with control is proposed in the paper, which alleviates the burden on the feedback control system by adding the manipulated variable reference trajectory. When interferences occur, the proposed coordination scheme can positively respond and compensate for the negative influence of disturbances, allowing the system to quickly return to the desired state. Besides, the corresponding analytical solution method is presented for the new coordination scheme, which avoids the complication of the conventional optimization solution method. Finally, the advantage of our coordination scheme has been effectively verified through the feed fluctuation ethylene column.