A multi-port converter based renewable energy system for residential consumers of smart grid

A fuzzy based energy management unit (FBEMU) for a renewable energy system (RES) is introduced in this paper. The RES includes solar PV panel and fuel cell stack as renewable sources and Battery and hydrogen tank as storage devices. A multi-port dc-dc converter is employed to integrate the renewable energies and supply the residential load via an inverter. The proposed system is able to operate in both grid connected and islanded modes for different energy management scenarios. The FBEMU defines the appropriate operation mode of dc-dc converter based on the predicted energy profiles of the load demand and PV generation considering the grid energy and fuel cell running costs and state of storage devices. Both long and short term energy predictions are used to define the operation modes of converter efficiently. A brief review on device level controller including small signal model of system and control loops are provided. The proposed system is simulated for a residential load considering an energy saving scenario.