Nonlinear flatness control applied for energy management of PV/batteries/supercapacitors hybrid power sources for stand-alone applications

This paper presents the hybridization of photovoltaic (PV) panels considered as the main source, with lead-acid batteries and supercapacitors used as storage system, for a stand-alone application. The aim is to supply a domestic load and energy management between different components. A nonlinear control strategy based on the flatness approach is applied to manage energy flows among the PV source, storage unit and load in the system. Simulation results are presented and discussed when applying different solar illuminations.