Energy Management and Control of a Stand-Alone Photovoltaic/Ultra Capacitor/Battery Microgrid

In this paper, the aggregation and implementation of a new energy management method in a microgrid power system is presented. The energy management is based on the use of a hybrid storage system. The Ultra Capacitors are used for facing high frequency variation of the load, such as in transient state, while the batteries are in charge of slow load / source variations. Then early ageing of the batteries are avoided. The advanced control system proposed in this study allows to choose the suitable storage element in order to face correctly the production/consummation variation. The whole system, including PV generator, hybrid storage system and a realistic load, all connected to a common DC-bus, is first modeled. The simulations by using Matlab are then carried out which confirm the good performances of the proposed energy management and associated control system.