Multivariate control and real-time optimization method for layer-burning boiler

The invention provides a multivariate control and real-time optimization method for a layer-burning boiler. The multivariate control and real-time optimization method comprises following steps: firstly, the control of the layer-burning boiler is converted to 3-variable input and 4-variable output multivariate control problem; secondly, the multivariate control problem is divided into two control problems of mutual coupling of two multivariable controllers with feedforward and feedback functions; state space elevation conversion of the two multivariate control problems with the feedforward and feedback functions are respectively performed, and the increment of current input signals is regarded as new input signals to be controlled; thirdly, the two multivariable control problems with the feedforward and feedback functions after state space conversion are divided into a past part and a future part based on current time and converted to the solution of quadratic programming optimal solution problem with constrained conditions; and fourthly, different layer-burning boiler model groups are divided, and the problem of strong non-linearity of the layer-burning boiler is solved via automatic switching of the model groups.