Abstract: Aiming at the problem of limited communication conditions in the control of severe slug flow in the horizontal pipe-downward inclined pipe-riser system of submarine mixed transportation, a MPC (Model Predictive Control) strategy based on DET (Dynamic Event Triggering) is proposed. Firstly, the causes and processes of slug flow are described, and the simplified model for control is analyzed. Secondly, a dynamic event triggering mechanism based on the deviation between predicted value and actual value is designed to monitor the running state of the system in real time and adjust the event triggering conditions to improve the steady-state performance of the system and reduce the triggering frequency. Finally, the comparative experiment analysis is carried out. The results show that the proposed method can effectively reduce the triggering frequency of the system on the basis of ensuring the control performance. Compared to the small opening valve, the oil production increases by about 2. 8%.

Key words: horizontal pipe-downward pipe-riser system, severe slug flow, event triggering, model predictive control