Configuration of MPC with Slave Controller
MPC Level
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4 Configuration of MPC with Slave Controller 4.1 Starting Point
The starting point is the standard connection of the MPC with its actuators. The
structure of the following example corresponds to the control of product quality
(CV1) and level (CV2) in a reactor as mentioned in section 2.3.4. However, this ex-
ample is not a realistic simulation of a real reactor.
Figure 4-1 Original signal flow chart of an MPC with 2x2 process, where the main transfer
function g22 shows an integral action
g22
g21
g12
g11
ModPreCon
.
MV1
MV2
CV1
CV2
CV2
g22
g21
g12
g11
ModPreCon
.
MV1
MV2
CV1
CV2
CV2
4.2 Connection in CFC
Now, a stabilizing PID controller is inserted for the integral sub process. In principal
this control structure is a cascade consisting of an MPC as master controller and
the stabilizing proportional-only controller as slave. The external set point SP_EXT
of the slave controller is linked to the corresponding manipulated variable of the
MPC.
The equality of the controlled variable of the master controller (i.e. the correspond-
ing MPC control channel) and the controlled variable of the slave controller is the
only special feature in the present case.