A fuel cell system 1 includes a fuel cell FC having a plurality of fuel battery cells, a control unit Cnt configured to control power generation of the fuel cell FC, a power storage apparatus S, and a DCDC converter Cnv. The control unit Cnt makes the voltage of the fuel cell FC higher than the voltage of the power storage apparatus S when the power generation by the fuel cell FC is stopped and makes the power generated in the fuel cell FC when the power generation by the fuel cell FC is stopped chargeable to the power storage apparatus S through a first path having diodes D1, D3, D5.

Provided are a recovery control system of a fuel cell and a method thereof. The recovery control system includes the fuel cell, a hydrogen supplier configured to supply hydrogen to the fuel cell, an air supplier configured to supply air to the fuel cell, an abnormality sensing unit configured to calculate a difference between a reference cell voltage predetermined depending on an output current of the fuel cell and a measured cell voltage of unit cells and to sense abnormality of air supply to a fuel cell stack based on the calculated difference between the reference cell voltage and the measured cell voltage or change in the difference, and a recovery controller configured to control the air supplier so as to increase a flow rate of air supplied to the fuel cell stack based on the change in the difference, when the abnormality sensing unit senses abnormality of air supply.

Example implementations relate to data center fuel cells. In some examples, a controller for data center fuel cells can include instructions to: determine when a load for a data center that exceeds a power threshold, determine a first quantity of power to be provided by a first power source and a second quantity of power to be provided by a second power source such that a sum of the first quantity of power and the second quantity of power is equal to or exceeds the power threshold for the data center, provide the first quantity of power utilizing the first power source, wherein the first quantity of power is less than the power threshold, and provide the second quantity of power utilizing the second power source.

On a start of a fuel cell system, (i) when the temperature of a high-voltage secondary battery obtained from a temperature sensor is higher than a predetermined reference value, a controller of the fuel cell system is configured to set an output voltage on a step-down side of a DC-DC converter to a higher voltage than a voltage of a low-voltage secondary battery and subsequently start an FC auxiliary machine using electric power from the high-voltage secondary battery. (ii) When the temperature of the high-voltage secondary battery obtained from the temperature sensor is equal to or lower than the predetermined reference value, on the other hand, the controller of the fuel cell system is configured to set the output voltage on the step-down side of the DC-DC converter to a lower voltage than the voltage of the low-voltage secondary battery and subsequently start the FC auxiliary machine using the electric power from the high-voltage secondary battery.

A fuel cell vehicle includes a hydrogen injector, a controller, and a first power supply. The hydrogen injector is configured to open when supplied with a current large than or equal to a predetermined current threshold. The controller is configured to control a current that is supplied to the hydrogen injector such that the supply current follows a target current value. The first power supply is configured to supply electric power to the hydrogen injector and a prescribed auxiliary. The controller is configured to increase the target current value when the controller detects at least one of a first start signal for starting the prescribed auxiliary and a second start signal for informing startup of the prescribed auxiliary.

A fuel cell system includes a fuel cell, auxiliary devices, an auxiliary device controller, a secondary battery, a current sensor, a voltage sensor, and a diagnosis controller. In an output stop state where the fuel cell does not output electric power, the auxiliary device controller performs a residual water scavenging process of scavenging water remaining in the fuel cell to outside of the fuel cell system by driving the auxiliary devices using electric power supplied from the secondary battery and supplying the gas to the fuel cell. The diagnosis controller diagnoses the secondary battery using a current integrated value that is obtained by integrating amounts of current supplied from the secondary battery in a predetermined voltage range of a discharge voltage of the secondary battery that changes in response to discharge when electric power is supplied to the auxiliary devices by performing the residual water scavenging process.

A method and system for controlling a voltage in a stop-mode of a fuel cell vehicle are provided. The method includes detecting whether a fuel cell enters the stop-mode and calculating a voltage command value of a bus terminal based on available charging power of a battery representing a level of power chargeable in a high voltage battery when the fuel cell enters the stop-mode. A converter connected between the high voltage battery and the bus terminal is operated to adjust the voltage of the bus terminal to be the voltage command value of the bus terminal. Additionally, power consumption of an electric field load of a vehicle is increased when the voltage is adjusted and then the voltage of the fuel cell measured by a voltage sensor is equal to or greater than a reference voltage preset in a memory.

The application describes a method for operating an electrolyzer and a fuel cell which, in parallel with one another, are connected to a device-side converter connection of a common bidirectional converter, on

Proposed is a fuel cell power control system. A fuel cell generates electric power. A load unit is electrically connected to the fuel cell. A DC/DC converter is disposed between the fuel cell and the load unit to convert the electric power between a low side of the DC/DC converter electrically connected to the fuel cell and a high side of the DC/DC converter electrically connected to the load unit. A battery is electrically connected to the high side of the DC/DC converter to be parallel to the load unit. A controller monitors a voltage of the load unit, the battery, or the high side of the DC/DC converter, and controls the electric power input to the load unit or output from the load unit in accordance with the monitored voltage.

The invention relates to a fuel cell assembly having a plurality of fuel cells amalgamated electrically and mechanically in a fuel cell stack, further including a residual gas treatment device for hydrogen-containing and oxygen-containing residual gases of the fuel cells, wherein the residual gas treatment device includes a recombination fuel cell with catalyst and membrane that is led via a power circuit separate from the fuel cells, and to a method for treating hydrogen-containing and oxygen-containing residual gases from fuel cells.