Optimal sizing of different configurations of renewable distributed generation systems for a green building in Egypt

In this work, a comparative study of different configurations of renewable distributed generation (DG) for green building in Egypt is proposed. The considered DG systems are stand-alone photovoltaic (PV) system with an energy storage facility, wind system with an energy storage facility, a hybrid system of PV-Wind-Battery, with and without the use of diesel generators, where diesel generators are used for reliability and security requirements. A proper configuration that meets the considered building's electric power demand with minimum cost over the lifetime of the system is proposed and discussed. The Hybrid Optimization Model for Multiple Energy Resources (HOMER) software is used to determine the optimal sizing of the considered renewable units. Additionally, due to the intermittent nature of these renewable resources, loss of power supply probability (LPSP) index has been taken in account while calculating the optimal sizing of the proposed DG system to assess the system reliability level.