# Size Optimization of a hybrid PV/Fuel Cell Grid-Connected Power System Integrating Hydrogen Storage

### Abstract

This paper describes the size optimization of a hybrid photovoltaic/fuel cell grid-linked power system integrating hydrogen storage. The overall objective was the optimal sizing of a hybrid power system to satisfy the load demand of a university laboratory with an unreliable grid, low energy cost, and minimal carbon emissions. The aim is to shift from a grid-linked diesel power system to a clean and sustainable energy system. The optimum design architecture was established by adopting the energy-balance methods of HOMER (hybrid optimization model for electric renewables). Analysis of hourly simulations was performed to decide the optimal size, cost, and performance of the hybrid system, using 22-year monthly averaged solar radiation data collected for Ambrose Alli University, Ekpoma (Lat. 6˚44.3ʹN, Long. 6˚4.8ʹE). The results showed that a hybrid system comprising a 54.7kW photovoltaic array, 7kW fuel cell system, 14kW power inverter, and 3kW electrolyzer with 8kg hydrogen storage tank, can sustainably augment the erratic grid with a very high renewable fraction of 96.7% at $0.0418/kWh. Compared with the conventional usage of grid/diesel generator systems; energy cost savings of more than 88% and a return on investment of 41.3% with a present worth of $308,965 can be derived in less than 3 years. The optimally sized hybrid system would possibly help mitigate the rural-to-urban drift and resolve the electricity problems hindering the economic growth in Nigeria. Moreover, the hybrid system can alleviate CO_{2} emissions from other power generation sources to make the environment cleaner and more eco-friendly.

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