DC PARALLEL OPERATION SYSTEM FOR FUEL CELL

摘要

PURPOSE:To attain the effective use of a fuel cell by connecting the output of a fuel cell power supply in parallel to the output of a rectifier and controlling the output voltage of a DC power unit of the fuel cell power supply in response to the fluctuation of a load via an output voltage control means in order to control the load sharing rate of the output of the fuel cell power supply. CONSTITUTION:The load sharing rate changes between a DC power unit 2 and a rectifier 5 and then the output of the unit 2 changes when the current flowing to a load 10 changes or the output voltage of the rectifier 5 changes due to the fluctuation of a commercial power supply 4. Therefore the load sharing rate can be controlled for the output of the unit 2, i.e., the output of a fuel cell power supply 3 by controlling an output voltage control circuit 2-2 via an appropriate means and changing the output voltage of the unit 2. As a result, the output capacity of a fuel cell 1 can be prescribed at a level higher than the peak value of the load 10. Thus it is possible to effectively use a fuel cell of which investment is at a high cost.