Infrastructure,automation and model-based operation strategy in a stand-alone hydrolytic solar-hydrogen production unit |
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Authors: | Chrysovalantou Ziogou Dimitris Ipsakis Fotis Stergiopoulos Simira Papadopoulou Stella Bezergianni Spyros Voutetakis |
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Affiliation: | 1. Chemical Process Engineering Research Institute, Centre for Research and Technology Hellas, P.O. Box 60361, 57001 Thermi-Thessaloniki, Greece;2. Department of Automation, Alexander Technological Educational Institute of Thessaloniki, P.O. Box 141, 54700 Thessaloniki, Greece |
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Abstract: | An autonomous power system that exploits solar energy for the production of hydrogen through water electrolysis is fully assessed in terms of system implementation and optimal operating strategy. A 10 kWp photovoltaic array supplies energy to a PEM electrolyzer rated at 6.9 kWp. In order to maintain a smooth operation regardless of the inherent weather fluctuations, a 1000 Ah/24 V lead–acid accumulator stores energy excess and provides it when needed. The monitoring and control of the system is implemented through a Supervisory Control and Data Acquisition system (SCADA), while the interactions between electrical and chemical subsystems are addressed by a complete automation infrastructure. The mathematical models of each subsystem are validated based on real operational data and a model-based power management strategy is proposed and assessed through a parameter sensitivity analysis. Further on, an off-line optimization framework is evaluated regarding the optimal operation of the system in two diverse, but representative time periods. The optimal parameters are identified and their effect on hydrogen production and accumulator utilization is reported. |
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Keywords: | Solar-hydrogen production Water electrolysis Automation and integrated control Stand-alone operation Model-based power management strategy |
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