Abstract:
This paper presents a power and energy management strategy for a wind-photovoltaic (PV) microgrid with an energy storage system (ESS) and PV array current injection on the DC-link. The ESS consists of a battery and a supercapacitor interfacedto the DC-link through bi-directional DC-DC converters. Cascade PI control is used to regulate the current supplied by the ESS to the DC-link. A fuzzy logic controller is proposed for efficient power sharing between the battery and the supercapacitor. A discrete-time simulation modelis used to study the microgrid operation. The PV array model is implemented as an s-function. Using the proposed system, the power supplied to the grid is maintained at the desired reference value during changes in wind speed, solar radiation, and grid power demand. Results also show that the ESS improves the DC-link voltage stability during three-phase to ground faults
