developed. In the simplest version, only the linear curve fitting option is available.
The simplest version of the In Situ controller subroutine has been added to
step is 5 minutes which produces 60 normalized cell voltage data points. In normal
operation after the observation period, the estimation of the noise free normalized cell
voltage is used to calculate the estimate of the concentration of dissolved alumina, the
PID controller error and finally the new feeding regime.
The Dyna/Marc simulator runs start in perfect steady-state condition as any
no feed observation period is started immediately. As can be seen in Figure 20, the
perturbation created by the observation last about an hour, after which the cell is back
in perfect steady-state conditions. The ACD is adjusted every 3 hours which create
very little perturbations on the feeding rate.
Figure 20: 12 hours Dyna/Marc simulation using In Situ control logic