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3 Ultra-supercritical Unit Coordination Control System
Multiple Model Multivariable Constrained Model
Predictive Control
The multiple models MCPC with double-layer structure is introduced in the
section. It is mainly composed of steady optimization, dynamic optimization
and multiple models policy. The structure diagram is shown in figure 2.
Fig. 2. structure diagram of multiple models MCPC system
Steady optimization was generally used for the purpose of the economic ben-
efits. In order to obtain better economic benefits, steady optimization integrates
the Ultra-supercritical unit load and energy consumption into optimization prob-
lems. It takes the constraint conditions of the inputs and outputs into considera-
tion and pushes the input and output values of steady state as far as possible to
the optimal value of meeting the constraints. Steady optimization can be written
as follows
min
u
f ( u,y,c )
(7)
hi ( u,y,α )=0 ,i =1 ,...,n e ,
gj ( u,y,β )
0 ,j =1 ,...,n in
In which, α , β are constant, u,y optimization variables, c the constant in target
function, n e the equality constraint number and n in the inequality constraint
number. The steady-state model used in steady optimization is the linearized
model of the nonlinear system.
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