For integral processes with large lag

strong dynamic disturbance

the predictive control algorithm based on first-order state correction was proposed. Considering the integral effect of deviation between predictive and actual state

it exerts state correction on the first-order dimension. Thus the controller's robustness is improved significantly. By simulation experiments

the effectiveness of the state correction algorithm was confirmed. And the algorithm has been adopted for liquid level control of flash tank in a refinery. The practical application results showed that the control effect is outstanding.