Techno-economic evaluation of a hybrid PV/wind system with grid/DG/Battery backups for an educational department in Tehran

Due to economic and environmental problems of fossil fuels and drawbacks of single implementation of renewable resources systems, Hybrid Renewable Energy Sources (HRESs) have been introduced. Thus, in this paper, a PV/wind source with various backups including battery/grid/diesel generator for an educational load with 35kW peak in Tehran city are proposed in order to reach the minimum lifecycle cost (NPC) by HOMER. The results show that grid-connected 150kW PV-110kW converter system is the most economical option among all 36 feasible systems due to supportive policies and subsidizing for renewable retailers in Iran. Not only could this system make the emissions produced by educational load equal to zero, but also it reduces other loads' emissions by helping the grid to meet surrounding loads. The other results of this paper show that in grid-battery and diesel-battery backup systems, Cycle Charging (CC) dispatch strategy has more economical result than Load following (LF) dispatch strategy. Furthermore, wind turbines in Tehran region is not economical, but if they were used, it would be better to implement small 1kW XL.1 wind turbine rather than a 10kW XLS one. In the end, according to the economic turbulence in Iran, a sensitivity analysis on the inflation rate shows that increasing the inflation rate could dramatically decrease the NPC of the system.