Hybrid modeling techniques for power electronics based on Petri Net

The field of power electronics poses challenging control problems that cannot be treated in a complete manner using traditional modeling and controller design approaches for the reason that power devices are typical hybrid systems in nature. The power devices become more and more complex for the tendency to be interconnected and large scale. It is very important to detect symptom in the early of large scale blackouts and take necessary precaution measures. In this paper, a hybrid method based on Petri net is introduced, which can combine knowledge-based methods and model-based methods quit well for system fault diagnosis problems. The detailed Petri Net models and relevant inference process are presented. The practical test in dc-dc, ac-dc converters shows that the fault diagnosis system based on the proposed models is practicable and effective.