Fuel cell system

摘要

An object of the present invention is to provide a fuel cell system suited for changing a drive operating point of a fuel cell at the time of low-efficiency power generation. The fuel cell system in accordance with the present invention includes a fuel cell which generates electric power by supplied reactant gases, an air compressor which adjusts the flow rate of a reactant gas supplied to the fuel cell, and a controller which controls an output current of the fuel cell by controlling the air compressor to change a drive operating point of the fuel cell. The controller sets a restriction on at least one of a current change amount and a voltage change amount per unit time when changing the drive operating point of the fuel cell in a range of low-efficiency power generation in which a power loss is larger than that in normal power generation.

主权项

1. A fuel cell system comprising:
a fuel cell which generates electric power by a supplied reactant gas; a gas adjusting device which adjusts a state of the reactant gas supplied to the fuel cell; and a controller which is programmed to control an output current of the fuel cell by controlling the gas adjusting device to change a drive operating point of the fuel cell; wherein the controller sets a restriction on at least one of a current change amount and a voltage change amount per unit time when changing the drive operating point of the fuel cell in a range of low-efficiency power generation in which power loss is larger than that in normal power generation, wherein the restriction on at least one of the current change amount and the voltage change amount per unit time is set based on a capacity of a fuel cell system, and wherein the controller is further programmed to calculate an output change permissible value of the fuel cell from the set restriction value, and limit the change in the drive operating point to remain within an output change permissible range.