Distribution Parameter System Model Predictive Control

Acetylene hydrogenation reactor is a device that converts a small amount of acetylene in ethylene stream into ethylene.The state variables in the reactor are related to time and space,which is a typical distributed parameter system.In recent years,the modeling research of acetylene hydrogenation reactor at home and abroad has been quite mature,but few scholars consider the time lag phenomenon caused by gas flow in acetylene hydrogenation reactor,which leads to certain errors in the existing acetylene hydrogenation reactor model and industrial field equipment.In this paper,the distributed time-delay control algorithm of acetylene hydrogenation system with timedelay is studied.Firstly,aiming at this research topic,the causes of time delay in distributed parameter system are studied,and the method of adding time delay after centralization of distributed parameter system with strong applicability is given.This method is applied to the model of acetylene hydrogenation reactor to obtain a refined model of acetylene hydrogenation reactor.Secondly,a predictive control algorithm is designed for distributed parameter systems with time delay.Based on the refined distributed parameter system model,the time-delay predictive control model can be obtained directly through system identification.For the time-delay prediction model,the state is collected,the state feedback is obtained,and the state constrained predictive control algorithm is designed.Finally,the state constrained predictive control algorithm with state feedback is applied to the time-delay refined acetylene hydrogenation reactor,and the temperature at the control outlet is maintained at the set value.Compared with the open-loop predictive control algorithm without state constraints,the state constrained predictive control algorithm with state feedback is more stable for the control of time-delay refined acetylene hydrogenation reactor.