An apparatus and a method for controlling a fuel cell system includes a fuel cell system including a fuel cell stack, a balance of plant for operating the fuel cell stack, and a fuel cell controller configured for controlling the BOP, a first power converter located between the fuel cell stack and a first voltage battery and including a bidirectional low voltage DC/DC converter, a second power located between the fuel cell stack and a second voltage battery to include a single bidirectional DC/DC converter module, and a controller configured for operating the first power converter or the single bidirectional DC/DC converter module of the second power converter, when the fuel cell system is started or stopped, and controlling the first power converter or the second power converter to supply driving power to the BOP using electrical energy of the first voltage battery or the second voltage battery.

A fuel cell system and the method of controlling the fuel cell system improve next-time startability in the following manner. Hydrogen, air, generation water, and the like that remain inside a large-sized fuel cell system needs to be removed after finishing operation of the large-sized fuel cell system, such as a fuel cell system for generating electric power. To the present end, when an air compressor needs to be operated, one fuel cell module is selected as a power supply module, and an air compressor is operated by the power supply module. Thus, durability of a fuel cell stack is improved, and at the same time, a constant amount of generated electricity necessary to restart the large-sized fuel cell system is ensured.

A fuel cell system and the method of controlling the fuel cell system improve next-time startability in the following manner. Hydrogen, air, generation water, and the like that remain inside a large-sized fuel cell system needs to be removed after finishing operation of the large-sized fuel cell system, such as a fuel cell system for generating electric power. To the present end, when an air compressor needs to be operated, one fuel cell module is selected as a power supply module, and an air compressor is operated by the power supply module. Thus, durability of a fuel cell stack is improved, and at the same time, a constant amount of generated electricity necessary to restart the large-sized fuel cell system is ensured.

A fuel cell system in which a fuel cell is coupled to a motor driving battery and a vehicular auxiliary machine is coupled to the motor driving battery via a first voltage converter, the fuel cell system including a fuel cell auxiliary machine coupled to the first voltage converter; and a second voltage converter that couples the fuel cell auxiliary machine to the fuel cell.

A system includes: a ring bus; a plurality of static uninterruptible power supplies (UPSs), each static UPS of the plurality of static UPSs including: at least one battery; an input that is electrically connected to a first external electrical power source; and an output that is electrically connected to a load, and, via a first corresponding choke, to the ring bus; at least one fuel-cell interface converter (FIC) that converts direct current (DC) electrical power to alternating current (AC) electrical power, each FIC of the at least one FIC being electrically connected to the ring bus via a second corresponding choke; and a fuel cell module corresponding to and electrically connected to each FIC, the fuel cell module including a fuel cell.

An illustrative example fuel cell reactant flow control valve assembly includes a pneumatic valve configured to allow reactant flow when the pneumatic valve is in an open condition and to prevent reactant flow when the pneumatic valve is in a closed condition. A control valve selectively allows a pressure of the reactant to provide pneumatic pressure to maintain the pneumatic valve in the open condition. The control valve selectively vents the pneumatic pressure reservoir to control a rate at which the pneumatic pressure decreases and a rate at which the pneumatic valve changes from the open condition to the closed condition.

A system for estimating a concentration of hydrogen in a fuel cell is provided. The system includes a hydrogen supply line supplying the hydrogen to the fuel cell and a time measurement sensor measuring a time duration from a point in time when an operation of the fuel cell ends to a point in time when the fuel cell restarts. A controller estimates an amount of air introduced into the fuel cell during the time duration using the measured time duration and estimates a concentration of hydrogen in the hydrogen supply line at the time of restarting the fuel cell based on the measured time duration and the estimated amount of introduced air.

A fuel cell control method, control system and electric vehicle. The control method comprises the following steps of determining that the fuel cell is shut down and controlling the fuel cell to enter a standby mode, wherein the standby mode comprises the step of controlling the electric quantity output by the stack module of the fuel cell such that it is used only for maintaining the working temperature of the fuel cell. From the above content, it can be known that according to the technical solution provided by the invention, the low-power consumption standby operation of the fuel cell can be maintained, the temperature of the fuel cell is ensured to be at the working temperature, the heat loss caused by the shutdown of the fuel cell is reduced, the power requirement of a whole vehicle is met in an instant response manner when the fuel cell is started for the second time, the starting time is short, the gas loss and the starting time caused by heating the fuel cell during the second starting are reduced, and the fuel cell does not need to be heated during the second starting, so that the rotating speed of a fan does not need to be increased, and the comfort of the electric vehicle is ensured.

To provide an electrical power system and an electrical power control device that make it possible to suppress deterioration of a fuel cell compared to that conventional seen. An electrical power system according to an embodiment includes a fuel cell, a heat source, a heat dissipator, and a controller. The fuel cell is configured to generate electrical power through electrochemical reactions to generate first heat. The heat source operates to generate second heat. The heat dissipator is configured to dissipate the first heat and the second heat. The controller is configured to control the fuel cell to allow, when the heat source is in operation, an amount of the first heat to be equal to or below an available heat dissipation capacity acquired by subtracting an amount of the second heat from a maximum amount of heat to be dissipated from the heat dissipator.

To provide an electrical power system and an electrical power control device that make it possible to suppress deterioration of a fuel cell compared to that conventional seen. An electrical power system according to an embodiment includes a fuel cell, a heat source, a heat dissipator, and a controller. The fuel cell is configured to generate electrical power through electrochemical reactions to generate first heat. The heat source operates to generate second heat. The heat dissipator is configured to dissipate the first heat and the second heat. The controller is configured to control the fuel cell to allow, when the heat source is in operation, an amount of the first heat to be equal to or below an available heat dissipation capacity acquired by subtracting an amount of the second heat from a maximum amount of heat to be dissipated from the heat dissipator.