Page 283 - Distributed model predictive control for plant-wide systems

Hot-Rolled Strip Laminar Cooling Process with Distributed Predictive Control 257

Reference Cooling curve
Cooling curve

900
Temperature (°C) 800

700

600
0 0
2
10
4
6
20
8
10 30 Strip point
Time (s)
Figure 11.11 The cooling curve of each strip-point with the proposed DMPC framework

Computer 1 Computer 2 …… Computer 6

TCP/IP networks
PLC
Field bus
… …

Experimental pilot apparatus

Figure 11.12 The structure of experimental system

computers (two for predictors and observer, the other four for local MPCs). The six computers
cooperated with each other to derive the optimal inputs within the sampling period of 0.37 s,
and then send the optimal inputs into a PLC that charges the field PI controllers. The runout
table experimental apparatus, shown in Figure 11.13, which is a pilot apparatus, is used to test
the performance of the DMPC framework.
The good performance of the proposed DMPC is further verified in Figures 11.14–11.16,
which show the FT profile, the output of each closed-loop subsystem, and the water flux of
each header group in the experiment, respectively. This method can not only control the CT