Patent ID: 11870118
Assignee: KYOCERA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 2:
3. A fuel cell system, comprising:
a fuel cell configured to generate power using a fuel gas and an oxygen-containing gas;
a reformer including a vaporizing section and a reforming section, the vaporizing section being configured to vaporize reformed water into steam, the reforming section being configured to cause the steam to react with a raw fuel to generate the fuel gas through a steam reforming reaction;
a raw fuel supply configured to supply the raw fuel to the reforming section;
a reformed water supply configured to supply the reformed water to the vaporizing section; and
a controller having a calculation formula for calculating an amount of reformed water to be used in the reforming section in response to a requested power level from an external unit,
wherein when the calculation formula has a plurality of elements, the controller selects, based on an increase or a decrease in the requested power level from the external unit, an element from the plurality of elements of the calculation formula in response to the increase in the requested power level, and an element different from the element to be selected for the increase from the plurality of elements in response to the decrease in the requested power level,
the controller selects, as the element of the calculation formula selected for the decrease, a measured flow rate of the raw fuel supplied to the reforming section in response to a decrease in the requested power level, and
the controller reduces the amount of reformed water supplied to the reformer after a delay from a timing at which a target generation current level decreases.