太陽光発電への超電導エネルギー貯蔵の応用に関する実験的検討

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  • Studies on Application of Superconducting Magnetic Energy Storage to Photovoltaic Power Genration Syntem
  • タイヨウコウ ハツデン エ ノ チョウデンドウ エネルギー チョゾウ ノ オウ

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Present study examines the possibility of application of a superconducting coil (SC) to the energy storage for photovoltaic power generation systems (PV systems). A solar cell should be operated at the maximum output point on the I-V characteristic curve with constant current and constant voltage in order that the solar energy be fully utilized. On the other hand, the suerconducting coil carries a variable current according to the stored energy. Therefore, a current transforming circuit is to be put between the solar cell and the SC.<br>In this paper, we propose a circuit which interconnects a PV system to a power system via an SC. A step-down chopper is put between the solar cell and the SC, and a DC-AC converter is installed between the SC and the AC power system. The SC can be used as an energy storage system for the PV system, and also, as an ordinary SMES (Superconducting Magnetic Energy Storage) when the PV system is not in operation. The control strategy of the chopper is presented, which keeps the operating point of the solar cell at its maximum output point. Expericental results are shown with the analysis of the storage efficiency. Furthermore, an example of real-scale system is designed with the proposed circuit, and its operation is simulated.

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