Quantised state system simulation in Dymola/Modelica using the DEVS formalism

Continuous-time systems can be converted to discrete-event descriptions using the Quantised State Systems (QSS) formalism. Hence it is possible to simulate continuous-time systems using a discrete-event simu-lation tool, such as a simulation engine based on the DEVS formalism. A new Dymola library, ModelicaDEVS, was devel-oped that implements the DEVS formalism. DEVS has been shown to be efficient for the simu-lation of systems exhibiting frequent switching opera-tions, such as flyback converters. ModelicaDEVS con-tains a number of basic components that can be used to carry out DEVS simulations of physical systems. Furthermore, it is also possible- with some restric-tions- to combine the two simulation types of Mod-elicaDEVS and Dymola (discrete-event and discrete-time simulation) and create hybrid models that contain ModelicaDEVS as well as standard Dymola compo-nents.