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Feasibility study of using a biogas engine as backup in a decentralized hybrid (PV/wind/battery) power generation system: Case study Kenya
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Polygeneration)ORCID iD: 0000-0001-8510-2783
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.ORCID iD: 0000-0002-4479-344X
2015 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 90, no 2, 1830-1841 p.Article in journal (Refereed) Published
Abstract [en]

In this study, a hybrid power system consisting of PV (Photovoltaics) panels, a wind turbine and a biogas engine is proposed to supply the electricity demand of a village in Kenya. The average and the peak load of the village are around 8kW and 16.5kW respectively.The feasibility of using locally produced biogas to drive a backup engine in comparison to using a diesel engine as backup has been explored through a techno-economic analysis using HOMER (Hybrid Optimization Model for Electric Renewables). This hybrid system has also been compared with a single diesel based power system.The results show that the hybrid system integrated with the biogas engine as backup can be a better solution than using a diesel engine as backup. The share of power generation by PV, wind and biogas are 49%, 19% and 32%, respectively. The LCOE (Levelized Cost of Electricity) of generated electricity by this hybrid system ($0.25/kWh) is about 20% cheaper than that with a diesel engine as backup ($0.31/kWh), while the capital cost and the total NPC (Net Present Cost) are about 30% and 18% lower, respectively.Regarding CO2 emissions, using a biogas engine as backup saves 17 tons of CO2 per year compared to using the diesel engine as backup.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 90, no 2, 1830-1841 p.
Keyword [en]
Biogas engine, Decentralized energy system, HOMER, Polygeneration, Rural electrification, Techno-economic optimization
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-175765DOI: 10.1016/j.energy.2015.07.008Scopus ID: 2-s2.0-84954398806OAI: oai:DiVA.org:kth-175765DiVA: diva2:862224
Note

QC 20151023

Available from: 2015-10-20 Created: 2015-10-20 Last updated: 2017-12-01Bibliographically approved

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Publisher's full textScopushttp://www.sciencedirect.com/science/article/pii/S0360544215009020

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Ghaem Sigarchian, SaraMalmquist, Anders

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