The invention provides a method for carrying out composite predictive control on coagulant dosage of
water treatment and relates to a method for controlling coagulant dosage of
water treatment, and the method can be used for solving the problem of complex control over nonlinear uncertain objects during a coagulation process. The method comprises the following specific steps of: establishing a composite predictive control model; through detecting the
turbidity of untreated water and the
turbidity of
effluent during the coagulation process of
water treatment and combining an
effluent quality set value, inputting the
turbidity of untreated water, the turbidity of
effluent and the effluent quality set value into the composite predictive control model so as to solve the real-
time control quantity of coagulant dosage of water treatment, wherein in the establishment of the composite predictive control model, the coagulant dosage of water treatment in a water
plant is controlled by utilizing composite predictive control method of simplified DMC (Dynamic Matrix Control) and untreated
water quality disturbance feed-forward predictive control, and the turbidity of untreated water
during feed-forward control can be predicted by utilizing a
time sequence predication method based on AR (Auto Regression) predication. According to the invention, the control accuracy is improved by utilizing the combination of simplified DMC and feed-forward predictive control, and the problem that sampling usually has a certain time interval is solved by utilizing the
time sequence predication method based on AR predication; and the method provided by the invention can be used for controlling the coagulant dosage of water treatment in the water
plant.