To realize long time output prediction for main steam temperature control object with large delay under imprecise mathematical model

a main steam temperature DMC-PID cascade control system with a dynamic matrix prediction controller(DMC)in master loop of the conventional main steam temperature PID cascade system was constructed and presented.On the basis of system step response

the system's DMC predictive model was established

and the optimization function and prediction reference trajectory was set.Moreover

a modified method for the dynamic matrix real-time updating and large delay revise was proposed to improve the dynamic performance of predictive control.Simulation test on main steam temperature DMC-PID cascade control system of a 660MW unit revealed that

compared with the conventional main steam temperature PID cascade control system

this DMC-PID system had better stability

speedability

and stronger anti-interference capability.