電気分解セルを負荷とする太陽電池の最適動作点の検討

概要

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Abstract Hydrogen is clean and environmentally friendly energy and is expected to be used for the future energy. We want to produce hydrogen by using electrolysis of water combined with photovoltaic cell. In this research, we studied the operation point of the photovoltaic cell that could be produce maximum quantity of hydrogen. The results are as follows; (1) The operation point can be adjusted by the capacity (e.g. open circuit voltage, short circuit current) of the photovoltaic cell and number of electrolysis cells. (2) The optimal operation point that can most efficiently produce hydrogen is equal to the maximum power output point of the photovoltaic cell. (3) We derived the formula for obtaining the number of electrolysis cells. This formula is used with voltage ratio※1 and current ratio※2 of a photovoltaic cell. (4) This system can be operated with best condition by adjusting the number of electrolysis cells combined with the amount of insolation and photovoltaic cell temperature. ※1 voltage ratio ; Voltage at maximum power out put/Open circuit voltage ※2 current ratio ; Current at maximum power out put/Short circuit current