ISOPE proved faster than the LAOO approach, due to the formers use of a more structurally accurate model; however, the ISOPE approach exhibits longer term oscillations, which are associated with the plant perturbation scheme used by the method.
There was a significant difference in the Extended Design Cost for the LAOO and ISOPE approaches, yet little difference between theses two methods in terms of their manipulated variable trajectories (cf.
Beyond a disturbance frequency of approximately eight RTO intervals, the LAOO approach yields better performance than the conventional Two-Phase approach.
The ISOPE approach inflates the variance cost significantly more than either the LAOO or QAOO approaches.
At approximately 3500 min from the simulation start both the ISOPE and QAOO approach diverge significantly from the optimal process operations, and the convergence rate of the LAOO approach is significantly slowed.