Scenario-integrated modeling and optimization of dynamic systems

Assessing the consequences of exceptional events, such as failures and sudd en changes in product demand or raw-material prices, is of great importance to the operation of chemical processes. Such an exceptional event and the resulting behavior of the process are called a scenario in this article. pr oblem formulations for their rigorous incorporation into the optimization o f dynamic systems are presented They allow the determination of operational strategies that are economically optimal and that keep the plant within a chosen regime in the stare space, even for a number of possible scenarios. The formulations ave based on a unifying model framework containing both co ntinuous and discrete dynamics. For a restricted class of problems a method for the numerical solution of the resulting scenario-integrated dynamic op timization problems is introduced. The applicability of this technique is d emonstrated with two examples of different complexity.