| 摘要 |
PURPOSE:To realize highly efficient operation of fuel cells economically through a simple constitution by feeding power deliberately from a commercial power supply upon increase of DC load when power is fed from the fuel cells to the DC load and an AC load. CONSTITUTION:An AC load to be connected through a DC-AC inverter 3 in divided into a plurality of AC loads 51,... which are connected to be switched, individually and uninterruptibly, between a commercial power supply 6 and the DC-AC inverter 3 synchronized therewith through switches 81,... and 71,.... An inverter control circuit 32 controls respective switches 71,..., 81,... according to the variation exceeding the rated capacity of fuel cells 1 upon variation of a DC load 4 connected through a DC-DC converter 2 thus varying the number of AC loads to be fed with power from the commercial power supply 6 side. |
