Design of Solar–Wind Hybrid System for Rural Electrification in Rwanda

Design of Solar–Wind Hybrid System for Rural Electrification in Rwanda
Authors : Emmanuel Nisingizwe, Cyrus Wekesa Wabuge, Maurice K. Mang’oli
Publication Date: 09-08-2017


Author(s):  Emmanuel Nisingizwe, Cyrus Wekesa Wabuge, Maurice K. Mang’oli

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Volume. 6 - Issue. 07 , July - 2017

e-ISSN:   2278-0181


Renewable Energy has become an attractive solution to electrify rural communities where to connect on national grid is expensive. For these areas that are far from the grid connection; off-grid solutions that includes both isolated distribution grids (mini-grids) with central power generation and individual stand-alone systems are more preferred. This is the same case in Rwanda due to its geographical situation with many hills. Therefore, this paper presents the development of an effective approach of design, simulation and analysis of a wind-solar hybrid system for a typical rural village in Kayonza District, Rwanda. This district has been chosen because is where we found the strongest wind speed in the country. The main power of this hybrid system comes from the photovoltaic panel, wind turbine, batteries / inverter system, while the diesel generator is used as backup units and the optimization software used for analyzing is HOMER. The average daily load demand of the selected village is 265.14kWh/day where an approximate maximum demand of 29.2 kW has been observed during the evening hours between 18– 21PM; and the village has 200 households with average of five persons per household. The optimal dispatch strategy of the diesel generator has been found to be Load following and the total net present cost of each system configuration has been calculated for 20 years of lifetime of system to examine the lowest energy cost option. It has been found that the combination of wind turbines, PV system, a battery bank and a diesel generator creates the optimum hybrid system. The obtained results show that the required initial capital investment for this project is $ 268,000. Then, the NPC needed for this project is $ 850,480 with total O&M cost of $ 21,376 for the whole system which is mainly increased by O & M of the diesel generator, batteries and wind turbine. This system can satisfy the demand at a LCOE of 0.339 $/kWh with renewable fraction of 56% as found in simulated results.


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