Energy flow management of three choppers connected in parallel using a flatness approach

In this paper, we show that a flatness-based approach can control each subsystem while allowing global system supervision. To illustrate this capability we propose a power flow management strategy based on a Petri net methodology for the supervision. The microgrid is composed of two boost and one buck-boost choppers connected in parallel through a common bus voltage. The two boost choppers are supplied by two different constant voltage sources while the buck-boost is fed by a battery. The main contributions of this article are twofold: first, we generate the power references from the power demand and the battery state of charge; and second, we design a control law based on the differential flatness of the model and on a specific choice of flat outputs.