Universal Control Strategy for Three Different Multilevel Inverters

The present paper deals with a generalized control strategy for the following multilevel inverters: Neutral Point Clamped (NPC), H-Bridge, and Load Phase Clamped (LPC). The contribution of this work is to develop, in spite of these devices differences, a common control strategy using simple triangular sinus PWM. By applying Petri Network theory, common configurations of these inverters are established. The generation of the trigger commands requires an accurate load current estimation to achieve a safe operating. Results by simulation and by experimentation are shown and discussed to validate the efficiency of the proposed technique.