A fuel cell system capable of improving the chemical durability of a membrane electrode assembly by compensating for the amount of an antioxidant lost within the electrolyte membrane or electrode of the fuel cell stack in such a manner that the antioxidant is provided from an antioxidant supply device, provided in a fuel processing system and/or an air processing system, to a fuel cell stack, in preparation for a case where the antioxidant within the electrolyte membrane or electrode is lost due to the dissolution or migration characteristic of the antioxidant.

A fuel cell system includes a fuel cell stack and a control device that controls operation of the fuel cell system based on a measured voltage value measured by a voltage sensor. When the fuel cell system is started and a value measured by a temperature sensor is equal to or less than a temperature determined in advance, the control device raises the voltage of the fuel cell stack until a voltage condition determined in advance is met, by supplying a cathode with an oxidant gas before current sweep is started. The control device sets a voltage command value and a current command value such that an operation point of the fuel cell stack is on an equal power line of the fuel cell stack when the operation point is caused to transition in at least a part of a transition period.

An energy regulation method for a fuel cell energy supply system including a plurality of fuel cell power generation modules, a plurality of power conversion modules, and a communication control module connected to the plurality of power conversion modules includes: calculating a parameter average value based on an energy state parameter of the fuel cell power generation module; calculating a compensation factor depending on the energy state parameter and the parameter average value; calculating a control parameter reference value of each of the power conversion modules based on a droop algorithm, and multiplying the control parameter reference value by the corresponding compensation factor to obtain a control parameter set value of the power conversion module; and regulating the corresponding fuel cell power generation modules depending on the control parameter set value.

A fuel cell electric vehicle (FCEV) power control system reduces a power limitation in conditions such as uphill driving and/or high temperature environments. The FCEV power control system utilizes dynamic cooling detection logic and/or predictive convection. The FCEV power control system may be operated in accordance with a method of controlling power of a fuel cell including receiving a plurality of inputs including a heat output of the fuel cell, an ambient temperature, a temperature of a coolant of the fuel cell, and a time of operation of the fuel cell. The method may include calculating an accumulation of cooling from convection, an accumulation of heat generated from the fuel cell, and a cooling ratio. The method may include adjusting a maximum allowable current of the fuel cell based on the cooling ratio. Related apparatuses, systems, techniques and articles are also described.

A temperature sensor of a fuel cell system detects, as a start-up time temperature, the temperature of a fuel cell stack or the outside temperature at the time of starting operation. A memory stores a plurality of current limitation patterns. A current limiting unit selects a current limitation pattern based on the detected start-up time temperature, and limits electrical current collected from the fuel cell stack based on the selected current limitation pattern and the temperature during operation of the fuel cell stack detected by the temperature sensor. A threshold value for a period until the temperature of the fuel cell stack reaches a reference temperature is set to be smaller as the start-up time temperature at which the current limitation pattern is selected from the plurality of current limitation patterns becomes lower.

Disclosed are a method and apparatus for subzero start-up of a fuel cell. The method for the subzero start-up of the fuel cell includes: introducing a gas containing hydrogen having a mass percentage of 5% to 100% to a hydrogen electrode and an air electrode of the fuel cell (2) under a condition of minus 50° C. to 0° C.; applying a current or a voltage to the fuel cell (2), and utilizing ohmic heat generation, reaction heat, and concentration overpotential heat generation of the fuel cell (2) to raise the fuel cell (2) to a required temperature or to cause the fuel cell (2) to reach to a set time, so as to implement the subzero start-up of the fuel cell.

A technique is disclosed of modified shutdown of a fuel cell power plant (14) having a fuel eel! stack assembly (26) contained with and supplying electrical power to a mobile vehicle (12). The -vehicle characteristically proceeds at intervals to a station. (10) containing one or more resources (20, 20A, 20B, 20C, etc) utilized by the fuel cell power plant, for resupply thereof. One such, resource provided at/by the station is electrical energy (20A), aid operation of the fuel cell power plant (14) is controlled to utilize the availability of that electrical energy (20A) to maintain, an active protective Hydrogen On condition for greatly extended intervals, for example many hours to several days or longer, via a Power On mode of operation. The Power On mode maintains at least a low level of hydrogen introduction and circulation sufficient to maintain a predetermined presence, e.g., pressure, of hydrogen at the fuel cell stack assembly (26).

A fuel cell system includes: a first fuel cell stack and a second fuel cell stack; a supply passage connected to an inlet of oxidant gas in the first fuel cell stack; an discharge passage connected to an outlet of the oxidant gas in the second fuel cell stack; introduction unit that introduces water in the oxidant gas flowing through the discharge passage into the supply passage; and a controller configured to perform refresh control of the first fuel cell stack by lowering voltage of the first fuel cell stack, and operates, during the refresh control, the introduction unit while keeping the second fuel cell stack in an electric power generation state.

A fuel cell system includes a plurality of fuel cell stacks, a power generation control unit that controls power generation of the plurality of fuel cell stacks based on a required power for the plurality of fuel cell stacks, and a refreshing control unit configured to perform a refreshing process of decreasing a voltage on the plurality of fuel cell stacks. The refreshing control unit performs the refreshing process on the first fuel cell stack when the required power changes from a state in which the required power is less than a first predetermined value to a state in which the required power is equal to or greater than the first predetermined value and when the required power is in a range which is equal to or greater than the first predetermined value and less than the second threshold value.

A controlling device of a fuel cell system with multiple stack towers and a controlling method thereof are provided. The controlling device comprises a temperature sensing equipment, a processor and a pulse width modulation circuit. The fuel cell system comprises multiple fuel cell stacks. The controlling method further comprises: calculating an average temperature of the fuel cell stacks based on the temperatures of the fuel cell stacks by the temperature sensing equipment; determining whether differences between the average temperature and the temperatures of the fuel cell stacks fall within a preset range of average temperature difference by the processor, and adjusting an output current of at least one of the fuel cell stacks by the pulse width modulation circuit commanded by the processor when the difference between the average temperature and the temperature of the at least one fuel cell stack falls outside the preset range of average temperature difference.