Abstract
Hybrid renewable energy systems have been accepted as one of the most convenient approaches towards the green energy future. As the renewable penetration propagates throughout the world, benefits of those systems other than providing clean energy have been brought to light. When hybridized, the stand-alone systems tend to generate significant energy excess to demand which needs to be disposed. These two aspects have been addressed in this study. Hybrid renewable energy systems containing solar photovoltaic, wind turbine, diesel generator and battery are optimized to supply reliable electricity and fresh water to a community of an Island not connected to the national grid in Bangladesh. The generated excess energy of the stand-alone hybrid system is utilized to run a reverse osmosis process for the desalination of sea water. Job creation, one of the prospective benefits of renewables, is maximized while minimizing cost and excess energy. The systems are optimized using genetic algorithm, particle swarm optimization and a hybrid of these two algorithms. The results reveal that, the hybrid algorithm exhibits better convergence and provides the optimum system with a cost of energy of 0.234 $/kWh, 1.64 jobs and 24,038 kWh/yr excess energy. By utilizing excess energy, a maximum of 11.8% and 9.3% reduction is achieved in overall system cost and electricity cost, respectively while job creation increases by 6%.
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