Petri Nets Modeling for Two-Cell Chopper Control Using DSPACE 1104

A two-cell power chopper system will be studied in this paper. The topology of this chopper is based on a combination of two cell switching interconnected via a flying capacitor. The system is a particular hybrid dynamical one which induces new and difficult control problems. In this paper, such problem is tackled by a new control concept based on Petri Nets modeling. The main advantage of this control is to use a discrete event algorithm for both current tracking and capacitor voltage balancing with the ability to drive directly the chopper switching components, by respecting the tolerance errors of load current and capacitor voltage. Simulation and experiment tests are carried out to verify the feasibility and effectiveness of the proposed control. The obtained results show that; the proposed controller presents good performances, in terms of both current tracking and voltage balancing compared to conventional existing controls according to the variation of the tolerance errors.