Techno-economic analysis of hybrid diesel generator/PV/battery power system for telecommunication application

Yinka Sofihullahi Sanusi, Hamisu Dandajeh, Mustapha H.

Abstract


In this study, the techno-economic analysis of a hybrid diesel generator/PV/battery power system was carried out for telecommunication substation in Nigeria. A case study of a telecommunication substation located at Mabushi, Abuja was considered. Homer Pro software was used to carry out the technical, economic and environmental analysis of different configurations of power systems:  DG only system, DG/Battery system, PV/Battery system and DG/PV/Battery system. The systems were compared with the DG/PV/Battery power system installed at Mabushi substation. Results show that the currently installed DG/PV/Battery system is oversized when compared with the optimized DG only system, DG/Battery system and DG/PV/Battery system. The installed DG/PV/Battery system has the least capacity factor of 6.42% when compared to other systems. The optimized DG/PV/Battery system has a capacity factor of 16.88 %.  The pure renewable system (PV/Battery system) has the highest NPC and COE. This is due to PV/Battery system high capital cost that contributed about 87.5% of total facility cost. The optimized PV/Battery/DG presented in this study gave the least NPC and COE of $51,291 and $0.453 respectively as compared to NPC and COE of $63,600 and $0.592 obtained in the currently installed power system. This implies that the optimized PV/Battery/DG system presented in this study is the most viable of all the systems considered and is therefore recommended for installation at the studied telecommunication substation. The sensitivity analysis of the diesel price on the COE in the recommended system shows that for 100 % price increase in diesel fuel, the COE increases by about 30%.  This is due to the fact that the integration of the PV/battery to the DG cushions the direct effect of the increased fuel price on the COE.


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Conclusions

Different hybrid system of diesel generator/PV/battery power system were designed, analyzed and compared with that of a hybid diesel generator/PV/battery power system installed at a telecommunication substation located in Mabushi, Abuja. Nigeria. The following conclusions were drawn from the study.

• The installed DG/PV/Battery system is oversized when compared to the optimized DG only system, DG/ Battery system and DG/PV/Battery system. Analysis shows that the required DG to power the site is 4.1 kW as compared to 17 kW installed at the substation.

• The installed DG/PV/Battery system has the least capacity factor of 6.42% as compared to the optimized DG/PV/Battery system (capacity factor of 16.88 %) presented in this study. This implies that the installed system is highly under-utilized when compared to other systems considered.

• The optimized PV/Battery system has the highest NPC and COE of $97344 and $0.86 respectively. The capital cost is the dominant cost of the PV/Battery system contributing about 87.5% to the NPC.

• The optimized PV/Battery/DG gave the least NPC and COE of $97344 and $0.86 respectively as compared to the NPC and COE of $97344 and $0.86 respectively for the presently installed PV/Battery/DG power system. This implies that the optimized PV/Battery/DG system is the most viable of all the systems considered in the present study and is therefore recommended for installation at the studied telecommunication substation.

• The sensitivity analysis of the diesel price on the COE in the recommended system shows that for 100 % price increase in diesel fuel, the COE increases by about 30%. This is due to the fact that the integration of the PV/battery to the DG cushions the direct effect of the increased fuel price on the COE.

• The recommended configuration (Optimized DG/PV/Battery system) also has the lowest emissions beside the pure renewable system (optimized PV/Battery system).

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