Hybrid dynamic optimization of power plants using sum-up rounding and adaptive mesh refinement

This paper deals with dynamic optimization of hybrid differential algebraic systems (Hybrid DAE) with explicit transitions, by means of direct collocation. Modes are described by binary variables that are treated as continuous variables during the dynamic optimization, then a specific rounding procedure coupled with an adaptive mesh refinement is applied in an iterative way. The method is applied to a benchmark hybrid model of a Combined Heat and Power plant with heat storage.