Abstract
The modular structure of both solar generator and electrolyser allows an optimal adaptation of direct coupled PV-electrolysis systems. These optimal designed systems prove to be an attractive concept as their annual total efficiency may reach the total efficiency of power point tracking systems. Actual data are taken from HYSOLAR—a German-Saudi project which will set up photovoltaic-electrolysis testing and research plants of the size of 350 kW and 10 kW in Riyadh and Stuttgart. The HYSOLAR simulation code has been developed for use in general optimisation analysis of design and operation problems in PV-electrolysis systems. Suitable normalized parameters have been introduced characterizing solar hydrogen plant configurations and allowing the comparison of different experimental results and optimization approaches. A general curve for optimally adapted configurations of photovoltaic electrolysis plants has been derived. For simplified design calculations only one single average operation point may substitute the complete annual simulation. In a first approach these technical results have been used also for economic optimization.
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