A MODIFIED PETRI NET FRAMEWORK FOR HYBRID SYSTEM MODELING
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2011, Vol 35, Issue 35
Abstract
In order to achieve the framework for analysis of hybrid dynamic systems, different approaches of modeling are used and at present is already an abundance of such paradigms, including Petri Nets. Often, the continuous dynamic is represented by differential – algebraic equations; on the other hand, the discrete dynamic is modeled by automata or input – output transitions systems, with a finite and countable number of states. This paper focuses on the modeling of hybrid systems with autonomous commutation of the model generated by a hysteresis phenomenon through a particular Petri Nets structures, called Modified Petri Nets (MPN). The main goal of this approach is to get a formal description language for such hybrid systems, which combines the advantages of a graphical description with the possibility of a transparent visualization, simulation and analysis. The proposed concepts are illustrated with a case study, which refers to a classical temperature control process in a room, using a thermostat with anticipative resistance. Starting from a generic mathematical model and using the Visual Object Net ++ software tool, several simulation scenarios was proposed, in order to verifying the Petri Nets structures achieved. The simulation results can be used for building a modular hierarchical structure of the models.
Authors and Affiliations
Mircea Adrian DRIGHICIU, Anca PETRISOR
Keywords
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